CN104577114A - Lithium ion battery positive electrode material lithium iron manganese phosphate and liquid phase preparation method thereof - Google Patents
Lithium ion battery positive electrode material lithium iron manganese phosphate and liquid phase preparation method thereof Download PDFInfo
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- CN104577114A CN104577114A CN201410807356.6A CN201410807356A CN104577114A CN 104577114 A CN104577114 A CN 104577114A CN 201410807356 A CN201410807356 A CN 201410807356A CN 104577114 A CN104577114 A CN 104577114A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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Abstract
The invention discloses a lithium ion battery positive electrode material lithium iron manganese phosphate which has a general chemical formula of LiFe1-xMnxPO4, wherein x is equal to 0.2-0.8. The liquid phase preparation method of the lithium ion battery positive electrode material lithium iron manganese phosphate comprises the following steps: synthesizing a precursor, namely weighing an iron salt, a manganese salt and oxalate according to a molar ratio, preparing a solution A from the iron salt, the manganese salt and an antioxidant, preparing the oxalate into a solution B, and preparing ammonia water into a solution C; measuring the solution B to serve as a base solution; simultaneously dripping the solution A and the solution C, and dripping the solution B; filtering, washing and performing vacuum drying, thereby obtaining an iron manganese oxalate precipitate precursor; dosing, namely weighing a carbon source, adding a lithium source, the precursor and a phosphorus source, mixing and performing ball-milling; compounding, namely adding the mixed materials into a compounding furnace, and treating the materials for calcining; and sintering, namely controlling the temperature rise rate, and performing furnace cooling on the compounded precursor powder to room temperature under the protection of inert gas atmosphere, thereby obtaining the carbon-coated lithium iron manganese phosphate positive electrode material.
Description
Technical field
The present invention relates to cell positive material and preparation method thereof in a kind of Material Field, particularly relate to a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium and liquid phase preparation process thereof.
Background technology
Now, lithium ion battery is widely used in Portable electronic equipment, and gradually toward large-scale electric equipment future development.But, high cost, safety problem and toxicly become existing lithium ion battery and be used in major obstacle, particularly lithium cobalt base oxide positive electrode on electric automobile or large-scale electrostatic energy-storage system.Positive electrode LiMPO
4(M=Fe, Mn, Ni, Co) based material because of its there is environmental friendliness, high thermal stability, energy density is higher and the advantages such as aboundresources obtain the accreditation of researcher, and thinks that polyanionic positive electrode is the desirable replacer being expected to become existing cobalt base oxide positive electrode.Particularly than LiFePO
4there is more high voltage platform, and adapt to the LiMnPO of popular electrolyte
4base anode material has good development prospect.But LiMnPO
4low electronic conductivity itself and ionic conductivity hinder its development.
Summary of the invention
The object of this invention is to provide one and can improve manganese-lithium phosphate anode material electron conduction, solve due to the structural instability problem that manganese element Jahn-Teller effect causes in lithium manganese phosphate simultaneously, improve the lithium ion battery positive pole material phosphoric acid ferrimanganic lithium of specific discharge capacity and high rate performance;
Another object of the present invention is to provide a kind of liquid phase preparation process of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium.
For achieving the above object, the technical solution used in the present invention is: a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, is characterized in that: chemical general formula is LiFe
1-xmn
xpO
4.
In this product, described x is 0.2-0.8.
A kind of liquid phase preparation process of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, it is characterized in that: step is as follows: the synthesis of (1) presoma: the molysite, manganese salt, the oxalates that take of 1-x:x:1.0-2.0 in molar ratio, molysite, manganese salt and antioxidant wiring solution-forming A, oxalates wiring solution-forming B, ammoniacal liquor wiring solution-forming C; Measure B solution as end liquid, pour in four-hole boiling flask; Solution A adds with solution C drip, after solution A and solution C dropwise, stirs 10-60min, then drips solution B; Stir ageing 3-6h, then still aging 10-15h; Oxalic acid ferrimanganic precipitation presoma is obtained after filtration, washing, 50 DEG C of vacuumizes;
(2) prepare burden: the carbon source taking 10-15%, adds ball grinder, quantitative solvent dissolves, and then 1.0-1.1:1:1 adds lithium source, presoma, phosphorus source in molar ratio, mixing and ball milling 1-5h;
(3) chemical combination: after mixing, chemical combination stove put into by material, after the chemical combination process of 2 ~ 20min, waits until calcining;
(4) sinter: control heating rate at 5-12 DEG C/min, by the presoma powder after chemical combination process, under atmosphere of inert gases protection, 550-750 DEG C of calcination processing 3-12h, cools to room temperature with the furnace, obtains the lithium ferric manganese phosphate positive electrode that carbon is coated.
In the method, described molysite is one or both in ferrous sulfate, frerrous chloride, and described manganese salt is one or both in manganese sulfate, manganese carbonate, the sub-manganese of acetic acid, and described oxalates is one or both in ammonium oxalate, oxalic acid.
In the method, described antioxidant is ascorbic acid.
In the method, described lithium source is one or both in lithium carbonate, lithium hydroxide.
In the method, described phosphorus source is one or both in ammonium dihydrogen phosphate, diammonium hydrogen phosphate.
In the method, described carbon source is one or both in glucose, sucrose or polyethylene glycol.
In the method, described solvent is the one in distilled water, ethanol, acetone.
In the method, described inert gas is the one in nitrogen, argon gas, nitrogen and hydrogen mixed gas.
Advantageous effect of the present invention is: because the present invention takes this kind of method, the chemical property of material is improved by the amount reducing manganese element, there is higher discharge voltage plateau and specific discharge capacity, also have the electron conduction being better than lithium manganese phosphate, the present invention is simultaneously simple to operate, and fail safe is good, environmentally safe, cheap, battery cost can be reduced, be suitable for suitability for industrialized production; Lithium manganese phosphate basis has been carried out the improvement experiment improving material discharging specific capacity, by to carry out the stably-doped structure of lithium manganese phosphate of ferro element to lithium manganese phosphate, improve the electron conduction of lithium manganese phosphate, 129mAh/g can be reached under specific discharge capacity 0.2C, material property has obviously had further lifting, stabilize the structure of lithium manganese phosphate, improve the electron conduction of lithium manganese phosphate, obtain the good lithium ferric manganese phosphate positive electrode of chemical property.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of the oxalic acid ferrimanganic presoma that the embodiment of the present invention 1 obtains;
Fig. 2 is the LiFe that the embodiment of the present invention 1 obtains
0.5mn
0.5pO
4cycle performance curve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Figure 1, 2, a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, is characterized in that: chemical general formula is LiFe in the present invention
1-xmn
xpO
4, described x is 0.2-0.8.
A kind of liquid phase preparation process of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, it is characterized in that: step is as follows: the synthesis of (1) presoma: the molysite, manganese salt, the oxalates that take of 1-x:x:1.0-2.0 in molar ratio, molysite, manganese salt and antioxidant wiring solution-forming A, oxalates wiring solution-forming B, ammoniacal liquor wiring solution-forming C; Measure B solution as end liquid, pour in four-hole boiling flask; Solution A adds with solution C drip, after solution A and solution C dropwise, stirs 10-60min, then drips solution B; Stir ageing 3-6h, then still aging 10-15h; Oxalic acid ferrimanganic precipitation presoma is obtained after filtration, washing, 50 DEG C of vacuumizes;
(2) prepare burden: the carbon source taking 10-15%, adds ball grinder, quantitative solvent dissolves, and then 1.0-1.1:1:1 adds lithium source, presoma, phosphorus source in molar ratio, mixing and ball milling 1-5h;
(3) chemical combination: after mixing, chemical combination stove put into by material, after the chemical combination process of 2 ~ 20min, waits until calcining;
(4) sinter: control heating rate at 5-12 DEG C/min, by the presoma powder after chemical combination process, under atmosphere of inert gases protection, 550-750 DEG C of calcination processing 3-12h, cools to room temperature with the furnace, obtains the lithium ferric manganese phosphate positive electrode that carbon is coated.
In the present embodiment, described molysite is one or both in ferrous sulfate, frerrous chloride, and described manganese salt is one or both in manganese sulfate, manganese carbonate, the sub-manganese of acetic acid, and described oxalates is one or both in ammonium oxalate, oxalic acid.
In the present embodiment, described antioxidant is ascorbic acid.
In the present embodiment, described lithium source is one or both in lithium carbonate, lithium hydroxide.
In the present embodiment, described phosphorus source is one or both in ammonium dihydrogen phosphate, diammonium hydrogen phosphate.
In the present embodiment, described carbon source is one or both in glucose, sucrose or polyethylene glycol.
In the present embodiment, described solvent is the one in distilled water, ethanol, acetone.
In the present embodiment, described inert gas is the one in nitrogen, argon gas, nitrogen and hydrogen mixed gas.
Embodiment 1:
1:1:0.1 takes a certain amount of ferrous sulfate in molar ratio, manganese sulfate, ascorbic acid be dissolved in 60ml distilled water, is made into the solution A of 1M; By slaine and ammonium oxalate mol ratio 1:1.2, take ammonium oxalate and be dissolved in 200mL distilled water as solution B; Measure the ammonia spirit 45mL of 2M as solution C; Get B solution 67mL to pour in four-hole boiling flask as end liquid, by solution A and solution C and drip enters in four-hole boiling flask, to control rate of addition be 5 seconds/drip, dropwise and stir 10min, then B solution is dripped, controlling rate of addition is 3 seconds/, dropwises rear stirring 4 hours, still aging 15 hours, suction filtration, washing, 50 DEG C of vacuumizes, obtain oxalate coprecipitation presoma, concrete pattern is shown in scanning electron microscope (SEM) photograph, sees accompanying drawing 1; By lithium source: presoma: phosphorus source: carbon source=1.03:1:1:0.12 mol ratio, take oxalate coprecipitation presoma, lithium carbonate, ammonium dihydrogen phosphate, glucose, ethanol ball milling mixes 2h, and the lower 650 DEG C of sintering 12h of nitrogen atmosphere, obtain the lithium ferric manganese phosphate positive electrode that carbon is coated.
With the lithium manganese phosphate of preparation for anode material for lithium-ion batteries, acetylene black is conductive agent, and Kynoar, makes electrode slice, take lithium metal as negative pole, composition button cell; Fig. 2 is the circulation performance curve of this material, and 0.2C circulates after 60 times, and capability retention is 99.2%.
Embodiment 2:
3:2:0.1 takes a certain amount of frerrous chloride in molar ratio, the sub-manganese of acetic acid, ascorbic acid be dissolved in 60ml distilled water, is made into the solution A of 1M; By slaine and ammonium oxalate mol ratio 1:1.5, take ammonium oxalate and be dissolved in 200mL distilled water as solution B; Measure the ammonia spirit 45mL of 2M as solution C; Get B solution 67mL to pour in four-hole boiling flask as end liquid, by solution A and solution C and drip enters in four-hole boiling flask, controlling rate of addition is 5 seconds/, dropwise and stir 10min, then drip B solution, controlling rate of addition is 3 seconds/, dropwise rear stirring 4 hours, still aging 15 hours, suction filtration, washing, 50 DEG C of vacuumizes, obtained oxalate coprecipitation presoma; By lithium source: presoma: phosphorus source: carbon source=1.03:1:1:0.12 mol ratio, take oxalate coprecipitation presoma, lithium carbonate, ammonium dihydrogen phosphate, glucose, ethanol ball milling mixes 3h, and the lower 650 DEG C of sintering 10h of argon atmosphere, obtain the lithium ferric manganese phosphate positive electrode that carbon is coated.
Embodiment 3:
0.675:0.325:0.1 takes a certain amount of ferrous sulfate in molar ratio, manganese carbonate, ascorbic acid be dissolved in 60ml distilled water, is made into the solution A of 1M; By slaine and oxalic acid mol ratio 1:1.2, take ammonium oxalate and be dissolved in 200mL distilled water as solution B; Measure the ammonia spirit 45mL of 2M as solution C.Get B solution 67mL to pour in four-hole boiling flask as end liquid, by A and C solution and drip enters in four-hole boiling flask, controlling rate of addition is 5 seconds/, dropwise and stir 50min, then drip B solution, controlling rate of addition is 3 seconds/, dropwise rear stirring 4 hours, still aging 15 hours, suction filtration, washing, 50 DEG C of vacuumizes, obtained oxalate coprecipitation presoma; By lithium source: presoma: phosphorus source: carbon source=1.03:1:1:0.12 mol ratio, take lithium hydroxide, oxalate coprecipitation presoma, diammonium hydrogen phosphate, glucose, distilled water ball milling mixes 2h, and the lower 710 DEG C of sintering 12h of nitrogen atmosphere, obtain the lithium ferric manganese phosphate positive electrode that carbon is coated.
Embodiment 4:
4:1:0.1 takes a certain amount of ferrous sulfate in molar ratio, manganese sulfate, ascorbic acid be dissolved in 60ml distilled water, is made into the solution A of 1M.By slaine and oxalic acid mol ratio 1:2.0, take ammonium oxalate and be dissolved in 200mL distilled water as solution B.Measure the ammonia spirit 60mL of 2M as solution C.Get B solution 67mL to pour in four-hole boiling flask as end liquid, by A and C solution and drip enters in four-hole boiling flask, controlling rate of addition is 5 seconds/, dropwise and stir 30min, then drip B solution, controlling rate of addition is 3 seconds/, dropwise rear stirring 4 hours, still aging 15 hours, suction filtration, washing, 50 DEG C of vacuumizes, obtained oxalate coprecipitation presoma.By lithium source: presoma: phosphorus source: carbon source=1.02:1:1:0.14 mol ratio, take lithium carbonate, oxalate coprecipitation presoma, diammonium hydrogen phosphate, polyethylene glycol, distilled water ball milling mixes 1h, and the lower 650 DEG C of sintering 12h of nitrogen atmosphere, obtain the lithium ferric manganese phosphate positive electrode that carbon is coated.
Embodiment 5:
1:1:0.1 takes a certain amount of ferrous sulfate in molar ratio, the sub-manganese of acetic acid, ascorbic acid be dissolved in 60ml distilled water, is made into the solution A of 1M.By slaine and oxalic acid mol ratio 1:1.2, take ammonium oxalate and be dissolved in 200mL distilled water as solution B.Measure the ammonia spirit 45mL of 2M as solution C.Get B solution 67mL to pour in four-hole boiling flask as end liquid, by A and C solution and drip enters in four-hole boiling flask, controlling rate of addition is 5 seconds/, dropwise and stir 10min, then drip B solution, controlling rate of addition is 3 seconds/, dropwise rear stirring 3 hours, still aging 10 hours, suction filtration, washing, 50 DEG C of vacuumizes, obtained oxalate coprecipitation presoma.By lithium source: presoma: phosphorus source: carbon source=1.05:1:1:0.12 mol ratio, take lithium hydroxide, oxalate coprecipitation presoma, ammonium dihydrogen phosphate, sucrose, acetone ball milling mixes 5h, and the lower 710 DEG C of sintering 6h of nitrogen atmosphere, obtain the lithium ferric manganese phosphate positive electrode that carbon is coated.
Claims (10)
1. a lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, is characterized in that: chemical general formula is LiFe
1-xmn
xpO
4.
2. a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 1, is characterized in that: described x is 0.2-0.8.
3. the liquid phase preparation process of a lithium ion battery positive pole material phosphoric acid ferrimanganic lithium, it is characterized in that: step is as follows: the synthesis of (1) presoma: the molysite, manganese salt, the oxalates that take of 1-x:x:1.0-2.0 in molar ratio, molysite, manganese salt and antioxidant wiring solution-forming A, oxalates wiring solution-forming B, ammoniacal liquor wiring solution-forming C; Measure B solution as end liquid, pour in four-hole boiling flask; Solution A adds with solution C drip, after solution A and solution C dropwise, stirs 10-60min, then drips solution B; Stir ageing 3-6h, then still aging 10-15h; Oxalic acid ferrimanganic precipitation presoma is obtained after filtration, washing, 50 DEG C of vacuumizes;
(2) prepare burden: the carbon source taking 10-15%, adds ball grinder, quantitative solvent dissolves, and then 1.0-1.1:1:1 adds lithium source, presoma, phosphorus source in molar ratio, mixing and ball milling 1-5h;
(3) chemical combination: after mixing, chemical combination stove put into by material, after the chemical combination process of 2 ~ 20min, waits until calcining;
(4) sinter: control heating rate at 5-12 DEG C/min, by the presoma powder after chemical combination process, under atmosphere of inert gases protection, 550-750 DEG C of calcination processing 3-12h, cools to room temperature with the furnace, obtains the lithium ferric manganese phosphate positive electrode that carbon is coated.
4. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 3, it is characterized in that: described molysite is one or both in ferrous sulfate, frerrous chloride, described manganese salt is one or both in manganese sulfate, manganese carbonate, the sub-manganese of acetic acid, and described oxalates is one or both in ammonium oxalate, oxalic acid.
5. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 4, is characterized in that: described antioxidant is ascorbic acid.
6. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 5, is characterized in that: described lithium source is one or both in lithium carbonate, lithium hydroxide.
7. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 6, is characterized in that: described phosphorus source is one or both in ammonium dihydrogen phosphate, diammonium hydrogen phosphate.
8. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 7, is characterized in that: described carbon source is one or both in glucose, sucrose or polyethylene glycol.
9. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 8, is characterized in that: described solvent is the one in distilled water, ethanol, acetone.
10. the liquid phase preparation process of a kind of lithium ion battery positive pole material phosphoric acid ferrimanganic lithium according to claim 9, is characterized in that: described inert gas is the one in nitrogen, argon gas, nitrogen and hydrogen mixed gas.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900877A (en) * | 2015-06-09 | 2015-09-09 | 天津巴莫科技股份有限公司 | Preparing method for LiFexMn(1-x)PO4/C for lithium-ion batteries |
| CN104993133A (en) * | 2015-05-28 | 2015-10-21 | 中南大学 | Preparation method of graphene modified LiMnxFe1-xPO4/C composite material |
| CN105047922A (en) * | 2015-07-20 | 2015-11-11 | 合肥国轩高科动力能源股份公司 | Carbon-coated lithium manganese ferric phosphoric acid cathode material and preparation method |
| CN105329867A (en) * | 2015-11-11 | 2016-02-17 | 浙江兴海能源科技有限公司 | High-compaction preparation method of lithium ferric manganese phosphate |
| CN105633401A (en) * | 2015-12-30 | 2016-06-01 | 山东精工电子科技有限公司 | High-energy density lithium ferric manganese phosphate cathode material prepared by adding active ion buffering agent and synthesis method |
| CN106252657A (en) * | 2015-06-04 | 2016-12-21 | 深圳市比克电池有限公司 | A kind of anode material of lithium battery preparation method |
| CN107681156A (en) * | 2016-08-02 | 2018-02-09 | 深圳市沃特玛电池有限公司 | A kind of preparation method of lithium battery iron manganese phosphate for lithium/charcoal composite positive pole |
| CN114394584A (en) * | 2021-12-14 | 2022-04-26 | 云南润久科技有限公司 | Method for preparing ferric manganese phosphate lithium battery anode material by coprecipitation-solid phase combination |
| CN115057426A (en) * | 2022-06-17 | 2022-09-16 | 德阳川发龙蟒新材料有限公司 | Preparation method of high-rate and high-compaction lithium iron manganese phosphate |
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| CN106252657A (en) * | 2015-06-04 | 2016-12-21 | 深圳市比克电池有限公司 | A kind of anode material of lithium battery preparation method |
| CN104900877A (en) * | 2015-06-09 | 2015-09-09 | 天津巴莫科技股份有限公司 | Preparing method for LiFexMn(1-x)PO4/C for lithium-ion batteries |
| CN105047922A (en) * | 2015-07-20 | 2015-11-11 | 合肥国轩高科动力能源股份公司 | Carbon-coated lithium manganese ferric phosphoric acid cathode material and preparation method |
| CN105329867A (en) * | 2015-11-11 | 2016-02-17 | 浙江兴海能源科技有限公司 | High-compaction preparation method of lithium ferric manganese phosphate |
| CN105633401B (en) * | 2015-12-30 | 2018-07-10 | 山东精工电子科技有限公司 | It is a kind of to add high-energy density lithium ferric manganese phosphate positive electrode and synthetic method prepared by active ion buffer |
| CN105633401A (en) * | 2015-12-30 | 2016-06-01 | 山东精工电子科技有限公司 | High-energy density lithium ferric manganese phosphate cathode material prepared by adding active ion buffering agent and synthesis method |
| CN107681156A (en) * | 2016-08-02 | 2018-02-09 | 深圳市沃特玛电池有限公司 | A kind of preparation method of lithium battery iron manganese phosphate for lithium/charcoal composite positive pole |
| CN114394584A (en) * | 2021-12-14 | 2022-04-26 | 云南润久科技有限公司 | Method for preparing ferric manganese phosphate lithium battery anode material by coprecipitation-solid phase combination |
| CN115057426A (en) * | 2022-06-17 | 2022-09-16 | 德阳川发龙蟒新材料有限公司 | Preparation method of high-rate and high-compaction lithium iron manganese phosphate |
| CN115057426B (en) * | 2022-06-17 | 2024-02-13 | 德阳川发龙蟒新材料有限公司 | Preparation method of high-magnification and high-compaction lithium manganese iron phosphate |
| CN116239091A (en) * | 2023-02-03 | 2023-06-09 | 广东邦普循环科技有限公司 | Preparation method of lithium iron manganese phosphate, lithium iron manganese phosphate positive electrode material and application |
| CN115947327A (en) * | 2023-02-07 | 2023-04-11 | 湖北亿纬动力有限公司 | Lithium manganese iron phosphate cathode material and preparation method and application thereof |
| WO2024164425A1 (en) * | 2023-02-07 | 2024-08-15 | 湖北亿纬动力有限公司 | Lithium manganese iron phosphate positive electrode material as well as preparation method therefor and use thereof |
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