JP2022527147A - 二次電池、その製造方法及び当該二次電池を備える装置 - Google Patents
二次電池、その製造方法及び当該二次電池を備える装置 Download PDFInfo
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- JP2022527147A JP2022527147A JP2021554402A JP2021554402A JP2022527147A JP 2022527147 A JP2022527147 A JP 2022527147A JP 2021554402 A JP2021554402 A JP 2021554402A JP 2021554402 A JP2021554402 A JP 2021554402A JP 2022527147 A JP2022527147 A JP 2022527147A
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Images
Classifications
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- H—ELECTRICITY
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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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
Description
二次電池
二次電池において、電池のエネルギー密度を増加させるために、膜層の面密度及び圧密度を増加させる傾向があるが、面密度及び圧密度の増加は電池の急速充電性能の悪化を引き起こす。これは、面密度の増加により活性イオンの移動経路が増加し、圧密度の増加により負極孔経路構造が悪くなるため、その中での活性イオンの液相伝導に影響を与えるからである。また、負極活性材料はサイクル過程において膨張が存在するため、活性材料と基材との間の接着力が低下し、さらに脱膜が発生してしまい、面密度が増加した場合、このような現象はより深刻である。したがって、どのように電池が高いエネルギー密度を有した上で、良好な急速充電性能及びサイクル性能を兼ね備えるかは、技術的に大きな課題である。
[正極シート]
LiaNibCocMdOeAf (式1)
前記式1において、0.8≦a≦1.2、0.5≦b<1、0<c<1、0<d<1、1≦e≦2、0≦f≦1であり、Mは、Mn、Al、Zr、Zn、Cu、Cr、Mg、Fe、V、Ti及びBのうちの一種又は複数種から選択され、Aは、N、F、S及びClのうちの一種又は複数種から選択される。
[電解質]
[セパレータ]
二次電池の製造方法
1)負極集電体の少なくとも一つの表面に、第1の負極活性材料を含む第1の負極膜層を形成する工程と、
2)前記第1の負極膜層に、第2の負極活性材料を含む第2の負極膜層を形成する工程と
によって、前記二次電池の負極シートを製造することを含み、
前記第1の負極活性材料は黒鉛を含み、且つ前記第1の負極活性材料の粒度の均等性(uniformity)は0.4~0.6であり、
前記第2の負極活性材料は人造黒鉛を含み、且つ前記第2の負極活性材料の粒度の均等性(uniformity)は0.25~0.45である。
最後に、正極シート、セパレータ、負極シートを順次積層して、セパレータが正極シートと負極シートとの間に位置して隔離の役割を果たし、次に巻回(又は積層)プロセスにより電極アセンブリを得る。電極アセンブリを外装に置き、乾燥した後に電解液を注入し、真空封止、静置、化成、整形などの工程を経て、二次電池を得る。本願の二次電池において、正極シート、負極シート及びセパレータは、巻回プロセスにより巻回構造の電極アセンブリに製造されてもよく、積層プロセスにより積層構造の電極アセンブリに製造されてもよい。
装置
実施例
一.二次電池の製造
実施例1
1)正極シートの製造
2)負極シートの製造
3)セパレータ
4)電解液の調製
5)電池の製造
二.性能パラメータの測定方法
1.急速充電性能測定
(2)サイクル特性の測定
三.各実施例、比較例の測定結果
Claims (15)
- 二次電池であって、
負極シートを含み、
前記負極シートは、負極集電体及び負極膜層を含み、
前記負極膜層は、第1の負極膜層及び第2の負極膜層を含み、
前記第1の負極膜層は、負極集電体の少なくとも一つの表面に設置され、且つ第1の負極活性材料を含み、
前記第1の負極活性材料は黒鉛を含み、且つ、前記第1の負極活性材料の粒度の均等性(uniformity)は0.4~0.6であり、
前記第2の負極膜層は、第1の負極膜層に設置され、且つ第2の負極活性材料を含み、
前記第2の負極活性材料は人造黒鉛を含み、且つ、前記第2の負極活性材料の粒度の均等性(uniformity)は0.25~0.45である、二次電池。 - 前記第1の負極活性材料の粒度の均等性(uniformity)は、0.45~0.6であり、好ましくは、0.5~0.57である、
請求項1に記載の二次電池。 - 前記第2の負極活性材料の粒度の均等性(uniformity)は、0.3~0.4であり、好ましくは、0.32~0.38である、
請求項1又は2に記載の二次電池。 - 前記第1の負極活性材料の粒度の均等性(uniformity)と前記第2の負極活性材料の粒度の均等性(uniformity)との比は、1.05~1.9であり、好ましくは、1.2~1.6である、
請求項1乃至3のいずれか一項に記載の二次電池。 - 前記第2の負極活性材料は二次粒子を含み、前記第2の負極活性材料における前記二次粒子の個数の割合は、≧30%であり、好ましくは、前記第2の負極活性材料における前記二次粒子の個数の割合は、≧50%である、
請求項1乃至4のいずれか一項に記載の二次電池。 - 前記第2の負極活性材料における前記人造黒鉛の質量割合は、≧80%であり、好ましくは、90%~100%である、
請求項1乃至5のいずれか一項に記載の二次電池。 - 前記第1の負極活性材料の体積分布粒径DV10は、前記第2の負極活性材料の体積分布粒径DV10より小さい、
請求項1乃至6のいずれか一項に記載の二次電池。 - 前記第1の負極活性材料のタップ密度は、前記第2の負極活性材料のタップ密度より大きい、
請求項1乃至7のいずれか一項に記載の二次電池。 - 前記第1の負極活性材料は、下記(1)~(6)のうちの一つ又は複数をさらに満たす、
(1)前記第1の負極活性材料の体積分布粒径DV10は、4.8μm~8.0μmであり、好ましくは、5.3μm~7.3μmであること、
(2)前記第1の負極活性材料の体積分布粒径DV50は、13.7μm~20.7μmであり、好ましくは、14.7μm~18.7μmであること、
(3)前記第1の負極活性材料の体積分布粒径DV99は、42μm~66μmであり、好ましくは、48μm~60μmであること、
(4)前記第1の負極活性材料の粒度分布(DV90~DV10)/DV50は、1.2~2.4であり、好ましくは、1.5~2.1であること、
(5)前記第1の負極活性材料のタップ密度は、0.88g/cm3~1.28g/cm3であり、好ましくは、0.98g/cm3~1.18g/cm3であること、
(6)30000N圧力での前記第1の負極活性材料の粉体圧密度は、1.77g/cm3~1.97g/cm3であり、好ましくは、1.82g/cm3~1.92g/cm3であること、
請求項1乃至8のいずれか一項に記載の二次電池。 - 前記第2の負極活性材料は、下記(1)~(6)のうちの一つ又は複数をさらに満たす、
(1)前記第2の負極活性材料の体積分布粒径DV10は、6.0μm~9.5μmであり、好ましくは、8μm~9μmであること、
(2)前記第2の負極活性材料の体積分布粒径DV50は、10μm~18μmであり、好ましくは、12μm~16μmであること、
(3)前記第2の負極活性材料の体積分布粒径DV99は、25μm~45μmであり、好ましくは、30μm~40μmであること、
(4)前記第2の負極活性材料の粒度分布(DV90~DV10)/DV50は、0.9~1.5であり、好ましくは、1.1~1.3であること、
(5)前記第2の負極活性材料のタップ密度は、0.7g/cm3~1.4g/cm3であり、好ましくは、0.8g/cm3~1.2g/cm3であること、
(6)30000N圧力での前記第2の負極活性材料の粉体圧密度は、1.65g/cm3~1.85g/cm3であり、好ましくは、1.71g/cm3~1.80g/cm3であること、
請求項1乃至9のいずれか一項に記載の二次電池。 - 前記第1の負極活性材料は、人造黒鉛、天然黒鉛のうちの一種又は複数種を含む、
請求項1乃至10のいずれか一項に記載の二次電池。 - 前記第1の負極活性材料は、人造黒鉛を含み、且つ前記第1の負極活性材料における前記人造黒鉛の質量割合は、≧50%であり、好ましくは、60%~100%である、
請求項1乃至11のいずれか一項に記載の二次電池。 - 前記負極膜層は、下記(1)~(3)のうちの一つ又は複数をさらに満たす、
(1)前記負極膜層の面密度は、90g/m2~136g/m2であり、好ましくは、104g/m2~117g/m2であること、
(2)前記負極膜層の圧密度は、1.5g/cm3~1.75g/cm3であり、好ましくは、1.6g/cm3~1.7g/cm3であること、
(3)前記負極膜層の厚さは、≧60μmであり、好ましくは、65μm~80μmであること、
請求項1乃至12のいずれか一項に記載の二次電池。 - 二次電池の製造方法であって、
1)負極集電体の少なくとも一つの表面に、第1の負極活性材料を含む第1の負極膜層を形成する工程と、
2)前記第1の負極膜層に、第2の負極活性材料を含む第2の負極膜層を形成する工程と
によって、前記二次電池の負極シートを製造することを含み、
前記第1の負極活性材料は黒鉛を含み、且つ、前記第1の負極活性材料の粒度の均等性(uniformity)は0.4~0.6であり、
前記第2の負極活性材料は人造黒鉛を含み、且つ、前記第2の負極活性材料の粒度の均等性(uniformity)は0.25~0.45である、
二次電池の製造方法。 - 請求項1乃至13のいずれか一項に記載の二次電池又は請求項14に記載の二次電池の製造方法で製造された二次電池を備える装置。
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CN110112366A (zh) * | 2019-06-18 | 2019-08-09 | 珠海冠宇电池有限公司 | 一种锂离子电池极片及锂离子电池 |
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JP2004087251A (ja) * | 2002-08-26 | 2004-03-18 | Nec Corp | 非水電解液二次電池 |
JP2009064574A (ja) * | 2007-09-04 | 2009-03-26 | Nec Tokin Corp | リチウムイオン二次電池 |
JP2015511389A (ja) * | 2013-01-25 | 2015-04-16 | エルジー・ケム・リミテッド | リチウム二次電池用負極及びこれを含むリチウム二次電池 |
JP2015064975A (ja) * | 2013-09-24 | 2015-04-09 | 株式会社Gsユアサ | 非水電解質二次電池 |
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JP2021529417A (ja) * | 2019-01-17 | 2021-10-28 | エルジー・ケム・リミテッド | 二次電池用負極活物質、それを含む負極及びその製造方法 |
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CN113875050A (zh) | 2021-12-31 |
EP4340065A1 (en) | 2024-03-20 |
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EP3944373A1 (en) | 2022-01-26 |
EP3944373B9 (en) | 2024-01-17 |
US20230253562A1 (en) | 2023-08-10 |
PL3944373T3 (pl) | 2024-03-04 |
KR102542989B1 (ko) | 2023-06-13 |
KR20210134925A (ko) | 2021-11-11 |
WO2021217635A1 (zh) | 2021-11-04 |
CN113875050B (zh) | 2023-08-04 |
JP7179196B2 (ja) | 2022-11-28 |
CN116914106A (zh) | 2023-10-20 |
EP3944373A4 (en) | 2022-06-01 |
US20220123306A1 (en) | 2022-04-21 |
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HUE064549T2 (hu) | 2024-03-28 |
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