JPWO2015152113A1 - 黒鉛系負極活物質材料、負極及びリチウムイオン二次電池 - Google Patents
黒鉛系負極活物質材料、負極及びリチウムイオン二次電池 Download PDFInfo
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- JPWO2015152113A1 JPWO2015152113A1 JP2016511859A JP2016511859A JPWO2015152113A1 JP WO2015152113 A1 JPWO2015152113 A1 JP WO2015152113A1 JP 2016511859 A JP2016511859 A JP 2016511859A JP 2016511859 A JP2016511859 A JP 2016511859A JP WO2015152113 A1 JPWO2015152113 A1 JP WO2015152113A1
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- graphite
- graphite particles
- negative electrode
- electrode active
- active material
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Images
Classifications
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- 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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
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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
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
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- C01P2004/32—Spheres
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
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Abstract
Description
第1の黒鉛粒子と第2の黒鉛粒子の合計に対する第2の黒鉛粒子の含有率が1〜30質量%の範囲にあり、
第1の黒鉛粒子の累積分布における累積5%の粒子径(D5)に対するメジアン粒子径(D50)の比D50/D5が、第2の黒鉛粒子の累積分布における累積5%の粒子径(D5)に対するメジアン粒子径(D50)の比D50/D5より小さく、
第1の黒鉛粒子と第2の黒鉛粒子との混合粒子の飽和タップ密度は、第1の黒鉛粒子の飽和タップ密度および第2の黒鉛粒子の飽和タップ密度のいずれよりも大きい、黒鉛系負極活物質材料が提供される。
第1の黒鉛粒子は、球形化された(非鱗片状)黒鉛粒子であり、その平均粒子円形度が0.6〜1の範囲にあることが好ましく、0.86〜1の範囲がより好ましく、0.90〜1の範囲がさらに好ましく、0.93〜1の範囲が特に好ましい。球形化処理は通常の方法で行うことができる。このような第1の黒鉛粒子は、原料コストを抑えながら高容量化を図る観点から、球形化された天然黒鉛粒子が好ましく、一般に入手できる球形化処理された天然黒鉛材料を用いることができる。
(式中、A:タッピングセルの質量、B:タッピングセルと黒鉛粉末の合計質量、D:充填容積)。
本発明の実施形態によるリチウムイオン二次電池用負極としては、例えば、負極集電体上に、上述の実施形態による黒鉛系負極活物質材料と結着剤を含む負極活物質層を設けたものを用いることができる。
本発明の実施形態によるリチウムイオン二次電池は、上記負極と正極と電解質を含む。
高円形度の黒鉛Aとして球形化された天然黒鉛粒子を用意し、低円形度の黒鉛Bとして鱗片状の人造黒鉛を用意した。前述の測定方法により、黒鉛Aの平均粒子円形度は0.86以上であり、鱗片状の黒鉛Bの平均粒子円形度より高いことを確認した。また、市販のレーザ回折・散乱方式粒子径分布測定装置を用いて、黒鉛AのD50/D5は1.36以下、D50は10〜20μmの範囲にあり、黒鉛BのD50/D5は1.52より大きく、D50は5〜30μmの範囲にあることを確認した。黒鉛Aと黒鉛Bの飽和タップ密度は、前述の測定方法により測定した結果、それぞれ1.08g/cm3、0.99g/cm3であった。黒鉛Aと黒鉛Bの混合粒子の飽和タップ密度も同様に測定し、表1に示す通りであった。
負極活物質として黒鉛Aのみを用いた以外は実施例1〜3と同様にしてリチウムイオン二次電池を作製した。
負極活物質として黒鉛Bのみを用いた以外は実施例1〜3と同様にしてリチウムイオン二次電池を作製した。
2 負極活物質層
3 正極集電体
4 負極集電体
5 セパレータ
6 ラミネート外装体
7 ラミネート外装体
8 負極タブ
9 正極タブ
Claims (18)
- 球形化された第1の黒鉛粒子と第1の黒鉛粒子より円形度の低い第2の黒鉛粒子を含む黒鉛系負極活物質材料であって、
第1の黒鉛粒子と第2の黒鉛粒子の合計に対する第2の黒鉛粒子の含有率が1〜30質量%の範囲にあり、
第1の黒鉛粒子の累積分布における累積5%の粒子径(D5)に対するメジアン粒子径(D50)の比D50/D5が、第2の黒鉛粒子の累積分布における累積5%の粒子径(D5)に対するメジアン粒子径(D50)の比D50/D5より小さく、
第1の黒鉛粒子と第2の黒鉛粒子との混合粒子の飽和タップ密度は、第1の黒鉛粒子の飽和タップ密度および第2の黒鉛粒子の飽和タップ密度のいずれよりも大きい、黒鉛系負極活物質材料。 - 第1の黒鉛粒子のD50/D5が1.5以下である、請求項1に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子のD50/D5が1.36以下である、請求項1に記載の黒鉛系負極活物質材料。
- 第2の黒鉛粒子のD50/D5が1.5より大きい、請求項1から3のいずれか一項に記載の黒鉛系負極活物質材料。
- 第2の黒鉛粒子のD50/D5が1.52より大きい、請求項1から3のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子と第2の黒鉛粒子との混合粒子の飽和タップ密度が1.1g/cm3以上である、請求項1から5のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子の飽和タップ密度が0.8g/cm3より大きい、請求項1から6のいずれか一項に記載の黒鉛系負極活物質材料。
- 第2の黒鉛粒子の飽和タップ密度が0.8g/cm3より大きい、請求項7に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子と第2の黒鉛粒子の合計に対する第2の黒鉛粒子の含有率が5〜30質量%の範囲にある、請求項1から8のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子と第2の黒鉛粒子の合計に対する第2の黒鉛粒子の含有率が5〜20質量%の範囲にある、請求項1から8のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子のメジアン粒子径(D50)が10〜20μmの範囲にあり、
第2の黒鉛粒子のメジアン粒子径(D50)が5〜30μmの範囲にある、請求項1から10のいずれか一項に記載の黒鉛系負極活物質材料。 - 第1の黒鉛粒子は、その平均粒子円形度が0.6〜1の範囲にある、請求項1から11のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子は、天然黒鉛粒子からなる、請求項1から12のいずれか一項に記載の黒鉛系負極活物質材料。
- 第1の黒鉛粒子は、非晶質炭素で被覆されている、請求項13に記載の黒鉛系負極活物質材料。
- 第2の黒鉛粒子は、鱗片状粒子からなる、請求項1から14のいずれか一項に記載の黒鉛系負極活物質材料。
- 第2の黒鉛粒子は、人造黒鉛粒子からなる、請求項1から15のいずれか一項に記載の黒鉛系負極活物質材料。
- 請求項1から16のいずれか一項に記載の黒鉛系負極活物質材料を含む、リチウムイオン二次電池用負極。
- リチウムイオンを吸蔵放出できる正極活物質を含む正極と、請求項17に記載の負極と、非水電解液とを含む、リチウムイオン二次電池。
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CN110137442B (zh) | 2022-08-09 |
US20170179487A1 (en) | 2017-06-22 |
EP3128586B1 (en) | 2019-01-23 |
US10749179B2 (en) | 2020-08-18 |
CN110137442A (zh) | 2019-08-16 |
WO2015152113A1 (ja) | 2015-10-08 |
CN106463727A (zh) | 2017-02-22 |
EP3128586A4 (en) | 2017-09-13 |
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