JP2022553518A - 二次電池及び該二次電池を備える装置 - Google Patents
二次電池及び該二次電池を備える装置 Download PDFInfo
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- JP2022553518A JP2022553518A JP2022521985A JP2022521985A JP2022553518A JP 2022553518 A JP2022553518 A JP 2022553518A JP 2022521985 A JP2022521985 A JP 2022521985A JP 2022521985 A JP2022521985 A JP 2022521985A JP 2022553518 A JP2022553518 A JP 2022553518A
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- Prior art keywords
- secondary battery
- organic solvent
- battery according
- silicon
- negative electrode
- Prior art date
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Links
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Images
Classifications
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/04—Processes of manufacture in general
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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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/134—Electrodes based on metals, Si or alloys
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
Description
本願の二次電池は、特定の活性材料を含有する負極、特定の厚さのセパレータの基材、及び特定の有機溶媒を含有する電解液を含み、その相乗作用により、本願の二次電池は、高いエネルギー密度を有する前提で、良好な高温サイクル性能、高温貯蔵性能、及び低い低温直流インピーダンスを両立できる。本願の第2の態様に係る装置は、本願の第1の態様に係る二次電池を備えるため、少なくとも前記二次電池と同じ利点を有する。
1 電池パック、
2 上部筐体、
3 下部筐体、
4 電池モジュール、
5 二次電池。
(1)正極シートの製造
(2)負極シートの製造
(3)電解液の調製
(4)セパレータの製造
(5)二次電池の製造
(1)高温サイクル性能測定
二次電池の45℃で800回サイクル後の容量維持率(%)=(二次電池の800回サイクル後の放電容量/二次電池の初回サイクルの放電容量)×100%。
(2)高温貯蔵性能測定
二次電池の60℃で30日間貯蔵後の体積膨張率(%)=[(V2-V1)/V1]×100%。
(3)低温直流インピーダンス測定
二次電池の低温直流インピーダンス DCR=(U1-U2)/(I1-I2)。
Claims (16)
- 二次電池であって、
負極集電体、及び負極集電体の少なくとも一つの表面に配置され且つ負極活性材料を含有する負極フィルムを備える負極シートと、
基材、及び基材の少なくとも一つの表面に配置される被覆層を備えるセパレータと、
有機溶媒を含有する電解液と、
を含み、
前記負極活性材料は、ケイ素系材料及び炭素材料を含み、
前記セパレータの基材は、厚さが7μm~12μmであり、
前記有機溶媒は、エチレンカーボネート(EC)を含み、前記有機溶媒における前記エチレンカーボネート(EC)の重量占有率は、20%以下である、
二次電池。 - 前記有機溶媒における前記エチレンカーボネート(EC)の重量占有率は、15%以下であり、
好ましくは、前記有機溶媒における前記エチレンカーボネート(EC)の重量占有率が、10%以下である、
請求項1に記載の二次電池。 - 前記セパレータの基材は、厚さが7μm~10μmである、
請求項1又は2に記載の二次電池。 - 前記セパレータの気孔率は、25%~50%であり、好ましくは、前記セパレータの気孔率が、30%~48%である、
請求項1乃至3のいずれか1項に記載の二次電池。 - 前記有機溶媒は、エチルメチルカーボネート(EMC)、ジエチルカーボネート(DEC)、ジメチルカーボネート(DMC)のうちの1種類又は複数種類をさらに含む、
請求項1乃至4のいずれか1項に記載の二次電池。 - 前記有機溶媒における前記エチルメチルカーボネート(EMC)の重量占有率は、60%~95%であり、
好ましくは、前記有機溶媒における前記エチルメチルカーボネート(EMC)の重量占有率が、75%~95%である、
請求項5に記載の二次電池。 - 前記有機溶媒における前記ジエチルカーボネート(DEC)の重量占有率は、30%以下であり、
好ましくは、前記有機溶媒における前記ジエチルカーボネート(DEC)の重量占有率が、20%以下である、
請求項5又は6に記載の二次電池。 - 前記有機溶媒における前記ジメチルカーボネート(DMC)の重量占有率は、15%以下であり、
好ましくは、前記有機溶媒における前記ジメチルカーボネート(DMC)の重量占有率が、10%以下である、
請求項5又は6に記載の二次電池。 - 前記電解液は、電解質塩をさらに含み、前記電解質塩は、ビスフルオロスルホニルイミドリチウム(LiFSI)及びヘキサフルオロリン酸リチウム(LiPF6)を含み、
前記電解液における前記ビスフルオロスルホニルイミドリチウム(LiFSI)の体積モル濃度は、0.8mol/L~1.3mol/Lであり、前記電解液における前記ヘキサフルオロリン酸リチウム(LiPF6)の体積モル濃度は、0.15mol/L~0.4mol/Lである、
請求項1乃至8のいずれか1項に記載の二次電池。 - 前記電解液における前記ビスフルオロスルホニルイミドリチウム(LiFSI)の体積モル濃度は、0.9mol/L~1.2mol/Lであり、前記電解液における前記ヘキサフルオロリン酸リチウム(LiPF6)の体積モル濃度は、0.15mol/L~0.3mol/Lである、
請求項9に記載の二次電池。 - 前記電解液の25℃での導電率は、6.5mS/cm~9.5mS/cmであり、好ましくは、前記電解液の25℃での導電率が、7mS/cm~9mS/cmであり、及び/又は、
前記電解液の25℃での粘度は、3.5mPa・s~5.5mPa・sであり、好ましくは、前記電解液の25℃での粘度が、4mPa・s~5mPa・sである、
請求項1乃至10のいずれか1項に記載の二次電池。 - 前記ケイ素系材料は、ケイ素単体、ケイ素合金、ケイ素酸素化合物、ケイ素炭素化合物、ケイ素窒素化合物のうちの1種類又は複数種類を含み、好ましくは、前記ケイ素系材料がケイ素酸素化合物を含み、及び/又は、
前記炭素材料は、黒鉛、ソフトカーボン、ハードカーボンのうちの1種類又は複数種類を含み、好ましくは、前記炭素材料が黒鉛を含み、前記黒鉛が人造黒鉛、天然黒鉛のうちの1種類又は複数種類から選択される、
請求項1乃至11のいずれか1項に記載の二次電池。 - 前記負極活性材料における前記ケイ素系材料の質量占有率は、50%以下であり、好ましくは、15%~30%である、
請求項1乃至12のいずれか1項に記載の二次電池。 - 前記セパレータの厚さは、11μm~16μmであり、好ましくは、前記セパレータの厚さが、12μm~14μmである、
請求項1乃至13のいずれか1項に記載の二次電池。 - 前記二次電池は、正極シートをさらに含み、前記正極シートは、正極集電体、及び正極集電体の少なくとも一つの表面に配置され且つ正極活性材料を含有する正極フィルムを備え、前記正極活性材料は、リチウムニッケルコバルトマンガン酸素化合物、リチウムニッケルコバルトアルミニウム酸化物のうちの1種類又は複数種類を含み、
好ましくは、前記正極活性材料は、LiaNibCocMdM’eOfAg又は少なくとも一部の表面に被覆層が配置されるLiaNibCocMdM’eOfAgのうちの1種類又は複数種類を含み、ここで、0.8≦a≦1.2、0.5≦b<1、0<c<1、0<d<1、0≦e≦0.1、1≦f≦2、0≦g≦1であり、Mは、Mn、Alから選択される1種類又は2種類であり、M’は、Zr、Al、Zn、Cu、Cr、Mg、Fe、V、Ti、Bから選択される1種類又は複数種類であり、Aは、N、F、S、Clから選択される1種類又は複数種類である、
請求項1乃至14のいずれか1項に記載の二次電池。 - 請求項1乃至15のいずれか1項に記載の二次電池を備える、装置。
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WO2015129187A1 (ja) * | 2014-02-28 | 2015-09-03 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2017228426A (ja) * | 2016-06-22 | 2017-12-28 | 株式会社村田製作所 | 電解液、電池、電池パック、電子機器、電動車両、蓄電装置および電力システム |
CN110391414A (zh) * | 2019-06-19 | 2019-10-29 | 重庆市维都利新能源有限公司 | 一种高能量密度聚合物锂离子电池及其制备方法 |
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EP4181264A1 (en) | 2023-05-17 |
KR102648175B1 (ko) | 2024-03-19 |
EP3930049B1 (en) | 2023-02-22 |
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US20220059867A1 (en) | 2022-02-24 |
KR20220064394A (ko) | 2022-05-18 |
CN114245943A (zh) | 2022-03-25 |
ES2940776T3 (es) | 2023-05-11 |
EP3930049A4 (en) | 2022-05-04 |
WO2021127996A1 (zh) | 2021-07-01 |
JP7460765B2 (ja) | 2024-04-02 |
PL3930049T3 (pl) | 2023-05-02 |
US11777134B2 (en) | 2023-10-03 |
EP3930049A1 (en) | 2021-12-29 |
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