JP5158578B2 - 非水電解質二次電池用負極およびそれを用いた非水電解質二次電池 - Google Patents
非水電解質二次電池用負極およびそれを用いた非水電解質二次電池 Download PDFInfo
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- JP5158578B2 JP5158578B2 JP2007167597A JP2007167597A JP5158578B2 JP 5158578 B2 JP5158578 B2 JP 5158578B2 JP 2007167597 A JP2007167597 A JP 2007167597A JP 2007167597 A JP2007167597 A JP 2007167597A JP 5158578 B2 JP5158578 B2 JP 5158578B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Description
単体ケイ素と単体ニッケルを重量比1:5にて混合し、1500℃、13.3Paにて溶融、急冷させてケイ素−ニッケル複合粒子を形成した。粉砕処理により粒径の大きいものと小さいものを作製し、粒径の小さい第一の複合粒子の粒径D95が20μm、粒径の大きい第二の複合粒子の粒径D95が30μmとなるよう調製した。このようにして生成した複合粒子を用いて、以下のようにして負極を作製した。
粒径の大きな第二の複合粒子のD95が50μm、粒径の小さな第一の複合粒子のD95が20μmとなる他は実施例1と同様にして複合粒子を作製し、電池を作製した。
粒径の大きな第二の複合粒子のD95が80μm、粒径の小さな第一の複合粒子のD95が20μmとなる他は実施例1と同様にして複合粒子を作製し、電池を作製した。
粒径の大きな第二の複合粒子のD95が100μm、粒径の小さな第一の複合粒子のD95が20μmとなる他は実施例1と同様にして複合粒子を作製し、電池を作製した。
粒径の大きな第二の複合粒子のD95が50μm、粒径の小さな第一の複合粒子のD95が30μmとなる他は実施例1と同様にして複合粒子を作製し、電池を作製した。
粒径の大きな第二の複合粒子のD95が50μm、粒径の小さな第一の複合粒子のD95が40μmとなる他は実施例1と同様にして複合粒子を作製し、電池を作製した。
負極活物質として人造黒鉛を用い、ポリフッ化ビニリデン樹脂を負極の活物質層作製時のバインダとして用いた。その他は実施例1と同様にして電池を作製した。
ポリフッ化ビニリデン樹脂を負極の活物質層作製時のバインダとして用いた。その他は実施例1と同様にして電池を作製した。
実施例1において、負極の複合粒子の粒径D95を30μmとしたもの1種類のみを作製した。その他は実施例1と同様にして電池を作製した。
実施例1において、負極の複合粒子の粒径D95を50μmとしたもの1種類のみを作製した。その他は実施例1と同様にして電池を作製した。
2 ケイ素化合物
3 負極活物質
3a 第一の複合粒子
3b 第二の複合粒子
4 (負極の)活物質層
5 負極集電体
6 負極
7 (正極の)活物質層
8 正極集電体
9 正極
10 セパレータ
11 外装フィルム
12 負極リードタブ
13 正極リードタブ
Claims (3)
- 負極と正極とリチウムイオン導電性の非水電解質とからなる非水電解質二次電池に用いられる負極が、粒度分布の異なる少なくとも2種類の、単体ケイ素及びケイ素化合物を含有する複合粒子からなる負極活物質と、加熱により脱水縮合反応を生じる熱硬化性樹脂の混合物を含み、前記熱硬化性樹脂により前記負極活物質の粒子間、及び負極活物質の粒子と集電体とが結着されており、粒径の小さい第一の複合粒子の粒径D 95 に対し粒径の大きな第二の複合粒子の粒径D 95 が1.25倍以上5.0倍以下であり、前記粒径の小さい第一の複合粒子の粒径D 95 が10μm以上30μm以下であることを特徴とする非水電解質二次電池用負極。
- 前記負極の電極密度が1.0g/cm3以上2.0g/cm3以下であることを特徴とする請求項1に記載の非水電解質二次電池用負極。
- 請求項1又は2に記載の非水電解質二次電池用負極を用いた非水電解質二次電池であって、放電終止電圧値が1.5V以上2.7V以下であることを特徴とする非水電解質二次電池。
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