JP6604635B2 - 高容量の負極を含む二次電池の製造方法 - Google Patents
高容量の負極を含む二次電池の製造方法 Download PDFInfo
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- JP6604635B2 JP6604635B2 JP2017515095A JP2017515095A JP6604635B2 JP 6604635 B2 JP6604635 B2 JP 6604635B2 JP 2017515095 A JP2017515095 A JP 2017515095A JP 2017515095 A JP2017515095 A JP 2017515095A JP 6604635 B2 JP6604635 B2 JP 6604635B2
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- negative electrode
- secondary battery
- lithium
- active material
- lithium secondary
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- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 238000000034 method Methods 0.000 title claims description 27
- 229910052744 lithium Inorganic materials 0.000 claims description 60
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 57
- 239000007773 negative electrode material Substances 0.000 claims description 29
- 238000006138 lithiation reaction Methods 0.000 claims description 25
- 239000006227 byproduct Substances 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 13
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 229910003002 lithium salt Inorganic materials 0.000 claims description 10
- 159000000002 lithium salts Chemical class 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 229910010272 inorganic material Inorganic materials 0.000 claims description 7
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000011147 inorganic material Substances 0.000 claims description 6
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
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- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
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- 239000002562 thickening agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
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Description
それぞれの前記負極板は、
負極活物質が塗布されている負極集電体部に前リチウム化(pre−lithiation)反応を通じて形成されたリチウム副産物層を含み、
前記負極集電体部の一側端部から延びており、負極活物質が塗布されていない無地部で構成された負極タブ部に無機物層が形成されており、
前記負極板の負極タブ部が一つの負極リードと電気的に結合されて負極端子を形成していることを特徴とする二次電池を提供する。
(a)金属シート上に負極タブ部に対応する部位を除いた負極集電体部に負極活物質を塗布した後、負極活物質が塗布されていない無地部で構成された負極タブ部に無機物をコーティングする過程;
(b)前記過程(a)で製造された金属シートをリチウム系溶媒に入れた後、電流を印加して前リチウム化(pre−lithiation)する過程;
(c)前記過程(b)で製造された金属シートを、負極集電体部及び負極タブ部を含む負極板の形状に裁断する過程;及び
(d)前記過程(c)で製造された負極板を2つ以上積層した後、負極タブ部を負極リードと電気的に結合して負極端子を形成する過程;を提供する。
1−1.負極板の製造
銅シート上に、負極活物質(SiO:黒鉛が重量比で30:70)92重量%、導電材としてSuper−P3重量%、バインダーとしてSBR3.5重量%、増粘剤としてCMC1.5重量%を溶剤であるH2Oに添加して製造した負極スラリーを、負極タブ部に対応する部位を除いた負極集電体部に50μmの厚さに塗布した後、圧着し、その後、前記負極合剤が塗布されていない無地部で構成された負極タブ部に、Al2O3が0.2μmの厚さを有するようにコーティングした。
正極活物質としてLi(Ni0.8Mn0.1Co0.1)O2を使用し、Li(Ni0.8Mn0.1Co0.1)O294重量%、Super−P(導電材)3.5重量%、PVdF(バインダー)2.5重量%を溶剤であるNMPに添加して製造した正極スラリーを、80μmの厚さでアルミニウムホイル上に塗布した後、圧着及び乾燥する過程を含むことによって、正極板を製造した。
前記で製造された正極板と負極板との間に多孔性分離膜(セルガードTM)を位置させ、正極タブ及び負極タブを集めて整列させた後、超音波溶接をしてそれぞれ正極リード及び負極リードと結合させた後、1M LiPF6のリチウム塩を含有したEC/EMC系非水性電解液を入れてリチウム二次電池を製造した。
負極板の製造において、負極無地部に無機物をコーティングしていないこと以外は、実施例1と同様の方法でリチウム二次電池を製造した。
負極板の製造において、前リチウム化反応を行っていないこと以外は、実施例1と同様の方法でリチウム二次電池を製造した。
実施例1、比較例1及び2のリチウム二次電池に対してレート特性を測定した。レート特性は、25℃の温度で2.5V〜4.3Vの電圧範囲で充放電を行い、充電は、0.1Cの定電流/定電圧(CC/CV)充電方式で67.5mAまで充電し、放電は、0.1C、0.5C、1Cの定電流(CC)放電方式で2.5Vのカットオフ条件で放電して実験を行った。これを、0.1Cの放電容量に対する0.5C、1Cの放電容量の効率で表1に示す。
実施例1、比較例1及び2のリチウム二次電池に対して寿命特性を測定した。寿命特性は、25℃の温度条件で、0.5C及び4.3Vの定電流/定電圧(CC/CV)充電方式で67.5mAまで充電し、0.5C及び2.5Vのカットオフ条件で定電流(CC)放電方式で放電することを1サイクルとして、100サイクルまで行った。その結果を図1に示した。
Claims (7)
- リチウム二次電池の製造方法であって、
(a)金属シート上に負極タブ部に対応する部位を除いた負極集電体部に負極活物質を塗布した後、負極活物質が塗布されていない無地部で構成された負極タブ部に無機物をコーティングする過程と、
(b)前記過程(a)で製造された金属シートをリチウム塩含有非水性電解液に入れた後、電流を印加して前リチウム化(pre−lithiation)する過程と、
(c)前記過程(b)で製造された金属シートを負極集電体部及び負極タブ部を含む負極板の形状に裁断する過程と、
(d)前記過程(c)で製造された負極板を2つ以上積層した後、負極タブ部を負極リードと電気的に結合して負極端子を形成する過程と
を含み、
前記リチウム二次電池は、2つ以上の負極板で構成された負極を含み、
それぞれの前記負極板は、
負極活物質が塗布されている負極集電体部に前リチウム化(pre−lithiation)反応を通じて形成されたリチウム副産物層を含み、
前記負極集電体部の一側端部から延びており、負極活物質が塗布されていない無地部で構成された負極タブ部に無機物層が形成されており、前記無機物層が形成されている部分にはリチウム副産物層が形成されておらず、
前記負極板の負極タブ部が一つの負極リードに溶接されて負極端子を形成しており、
前記負極活物質はSiO v (0.5≦v≦1.2)を含み、
前記無機物は、SiO 2 、TiO 2 、Al 2 O 3 、ZrO 2 、SnO 2 、CeO 2 、MgO、CaO、ZnO、Y 2 O 3 、Pb(Zr,Ti)O 3 (PZT)、Pb 1−x La x Zr 1−y Ti y O 3 (PLZT)(0<x<1、0<y<1)、Pb(Mg 3 Nb 2/3 )O 3 −PbTiO 3 (PMN−PT)(0<y<1)、BaTiO 3 、hafnia(HfO 2 )、SrTiO 3 、及びこれらの2つ以上の混合物からなる群から選択される1つ以上であることを特徴とする、リチウム二次電池の製造方法。 - 前記過程(b)においてリチウム塩は、LiCl、LiBr、LiI、LiClO4、LiBF4、LiB10Cl10、LiPF6、LiCF3SO3、LiCF3CO2、LiAsF6、LiSbF6、LiAlCl4、CH3SO3Li、CF3SO3Li、(CF3SO2)2NLi、Li3N、LiI、Li5NI2、Li3N−LiI−LiOH、LiSiO4、LiSiO4−LiI−LiOH、Li2SiS3、Li4SiO4、Li4SiO4−LiI−LiOH、及びLi3PO4−Li2S−SiS2からなる群から選択される1つ以上であることを特徴とする、請求項1に記載のリチウム二次電池の製造方法。
- 前記過程(b)で10mA〜10Aの電流を印加することを特徴とする、請求項1に記載のリチウム二次電池の製造方法。
- 前記過程(b)で電流を0.1時間〜12時間印加することを特徴とする、請求項1に記載のリチウム二次電池の製造方法。
- 前記過程(b)と過程(c)との間に、30℃〜100℃、及び6時間〜12時間の条件下で金属シートを安定化させる過程をさらに含むことを特徴とする、請求項1に記載のリチウム二次電池の製造方法。
- 前記過程(d)において、負極タブ部と負極リードとの結合は溶接によって行われることを特徴とする、請求項1に記載のリチウム二次電池の製造方法。
- 前記溶接は超音波溶接であることを特徴とする、請求項6に記載のリチウム二次電池の製造方法。
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EP3179544B1 (en) | 2019-12-25 |
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US10581073B2 (en) | 2020-03-03 |
CN106716682B (zh) | 2019-12-03 |
US20170338480A1 (en) | 2017-11-23 |
BR112017005881B1 (pt) | 2021-07-20 |
CN106716682A (zh) | 2017-05-24 |
JP2018503932A (ja) | 2018-02-08 |
BR112017005881B8 (pt) | 2023-03-21 |
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