JP2018523890A - コバルト酸リチウムを合成するための正極活物質を含むリチウム二次電池、この製造方法 - Google Patents
コバルト酸リチウムを合成するための正極活物質を含むリチウム二次電池、この製造方法 Download PDFInfo
- Publication number
- JP2018523890A JP2018523890A JP2017567684A JP2017567684A JP2018523890A JP 2018523890 A JP2018523890 A JP 2018523890A JP 2017567684 A JP2017567684 A JP 2017567684A JP 2017567684 A JP2017567684 A JP 2017567684A JP 2018523890 A JP2018523890 A JP 2018523890A
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- Prior art keywords
- positive electrode
- secondary battery
- lithium secondary
- lithium
- negative electrode
- Prior art date
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Abstract
Description
Co:CoO:Co3O4:Li2O=4:5:1:6のモル比で混合した後、遊星ボールミル(planetary ball mill)で2時間撹拌した正極活物質組成物と、Super−P及びPVdFを92:4:4の重量比で混合して正極合剤を形成した(ローディング450mg/25cm2)。さらに20μm厚さのリチウム金属をラミネーション方法で合紙した。
実施例1の負極体でLiPON保護層を形成しない点を除いては、実施例1と同様に実施してリチウム二次電池を製造した。
実施例1の負極体で銅集電体の一面に、LiPON保護層の代わりに0.3μmの厚さのPVdF−HFP(HFP含量5重量%)保護層を形成したことを除いては、実施例1と同様に実施してリチウム二次電池を製造した。
実施例1の正極活物質の代わりにLCO系正極活物質、Super−P及びPVdFを95:2.5:2.5の重量比で混合した組成物を使ったことを除いては、実施例1と同様に実施してリチウム二次電池を製造した。
実施例1及び比較例1で製造されたリチウム二次電池を充電0.2C、4.25VのCC/CV(5% current cut at1C)、放電0.5C CC 3Vの条件で充放電テストを実施し、初期容量に比べて80%に至る時点のサイクル数を下記表1に記した。
実施例1ないし3で製造されたリチウム二次電池を0.15C、4.25VのCC/CV(5% current cut at 1C)の条件で充電した後、放電0.5C3V CC、充電0.2C4.25VのCC/CV(5% current cut at 1C)の条件で充放電テストを実施し、初期容量に比べて80%に達する時点のサイクル数を下記表2に記した。
11 正極集電体
12 正極合剤
20 負極
21 負極集電体
22 負極合剤(リチウム薄膜)
30 分離膜
Claims (10)
- 正極集電体及び正極合剤を含む正極;
負極集電体及び負極合剤を含む負極;
これらの間に介在される分離膜;及び
電解質;
を含むリチウム二次電池において,
前記正極合剤は正極活物質であって、Co、CoO、Co3O4及びLi2Oが組み合わせられた複合体を含み、
前記負極合剤はリチウム金属であって、負極集電体と分離されて正極合剤と分離膜の間に位置し、前記正極合剤の一面にリチウム薄膜が形成されたことを特徴とするリチウム二次電池。 - 前記正極合剤に含まれる正極活物質は、Co:CoO:Co3O4:Li2O=3.8〜4.2:4.8〜5.2:0.8〜1.2:5.8〜6.2のモル比で組み合わせられた複合体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。
- 前記正極合剤に含まれる正極活物質は、Co:CoO:Co3O4:Li2O=4:5:1:6のモル比で組み合わせられた複合体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。
- 前記リチウム二次電池は、50ないし70℃の温度で初期充電されるとき、前記正極活物質であるCo、CoO、Co3O4及びLi2Oが組み合わせられた複合体がLiCoO2に合成さ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。
- 前記リチウム二次電池は、0.01ないし0.5Cの電流密度で初期充電されるとき、正極合剤上に形成されたリチウム金属をリチウムイオンの形態で負極集電体上に移動させ、負極集電体上にリチウム薄膜がコーティングされた負極が形成さ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。
- 前記負極集電体の分離膜側に対向する一面には高分子保護層が形成されたことを特徴とする、請求項1に記載のリチウム二次電池。
- 前記高分子保護層は、リチウムイオン伝導性高分子で形成されたことを特徴とする、請求項6に記載のリチウム二次電池。
- 前記高分子保護層は、ポリエチレンオキシド(PEO)、ポリアクリロニトリル(PAN)、ポリメチルメタクリレート(PMMA)、ポリフッ化ビニリデン(PVDF)、ポリフッ化ビニリデン−ヘキサフルオロプロピレン(PVDF−HFP)、LiPON、Li3N、LixLa1−xTiO3(0<x<1)及びLi2S−GeS−Ga2S3からなる群より選択され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。
- 正極集電体上に正極合剤を形成する段階;
前記正極合剤上にリチウム薄膜を形成する段階;
前記リチウム薄膜上に分離膜及び負極集電体を順次配置した後で合紙する段階;及び
電解質を注入する段階;
を含み、
前記正極合剤は、正極活物質として、Co、CoO、Co3O4及びLi2Oが組み合わせられた複合体を含むことを特徴とするリチウム二次電池の製造方法。 - 前記負極集電体の分離膜側に対向する一面には、高分子保護層を形成する段階;
をさらに行うことを特徴とする、請求項9に記載のリチウム二次電池の製造方法。
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Patent Citations (3)
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JP2002237293A (ja) * | 2000-07-06 | 2002-08-23 | Japan Storage Battery Co Ltd | 非水電解質二次電池およびその製造方法 |
WO2014065067A1 (ja) * | 2012-10-22 | 2014-05-01 | 国立大学法人 東京大学 | 電池 |
JP2015159098A (ja) * | 2013-12-04 | 2015-09-03 | 国立大学法人 東京大学 | 活物質 |
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CN108028422B (zh) | 2021-01-08 |
US10651469B2 (en) | 2020-05-12 |
WO2018016737A1 (ko) | 2018-01-25 |
EP3471193A4 (en) | 2019-06-12 |
EP3471193A1 (en) | 2019-04-17 |
US20180323430A1 (en) | 2018-11-08 |
JP6609644B2 (ja) | 2019-11-20 |
KR101984722B1 (ko) | 2019-05-31 |
EP3471193B1 (en) | 2020-08-05 |
KR20180010423A (ko) | 2018-01-31 |
CN108028422A (zh) | 2018-05-11 |
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