JP7258177B2 - 負極活性材料、その製造方法、並びにその関連の電池、電池モジュール、電池パック及び装置 - Google Patents
負極活性材料、その製造方法、並びにその関連の電池、電池モジュール、電池パック及び装置 Download PDFInfo
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- JP7258177B2 JP7258177B2 JP2021555013A JP2021555013A JP7258177B2 JP 7258177 B2 JP7258177 B2 JP 7258177B2 JP 2021555013 A JP2021555013 A JP 2021555013A JP 2021555013 A JP2021555013 A JP 2021555013A JP 7258177 B2 JP7258177 B2 JP 7258177B2
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- negative electrode
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- battery
- silicon
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- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 2
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Description
前記錫系負極材は、錫単量体、錫酸素化合物、及び錫合金のうちの一種類又は複数種類から選択される。
ポリマー前駆体を溶媒で溶解し、均一に分散するまで攪拌する工程と、
シリコン系負極材及び錫系負極材のうちの一種類又は複数種類から選択されるコア材を、ポリマー前駆体溶液に添加し、攪拌して混合スラリーを取得する工程と、
混合スラリーを噴霧乾燥機又は湿式被覆機に入れて、不活性非酸化性ガスの雰囲気下で乾燥して、固体粉末を取得する工程と、
前記固体粉末を不活性非酸化性ガスの雰囲気下で、200℃~450℃の温度で熱処理して、負極活性材料を取得する工程と、
を含み、
前記負極活性材料は、コア材及びその少なくとも一部の表面上のポリマー改質被覆層を含み、前記コア材は、シリコン系負極材及び錫系負極材のうちの一種類又は複数種類であり、前記負極活性材料は、熱重量分析測定において、不活性非酸化性ガスの雰囲気下で、温度が25℃から800℃まで昇温する過程で、重量減少率が、0.2%≦重量減少率≦2%を満たす。
実施例1
(1)1gのポリアクリロニトリルを秤量して、1000mLのジメチルホルムアミド溶媒に添加し、ポリアクリロニトリルが完全に溶解するまで攪拌する。
(2)100gの一酸化シリコンを秤量して、工程(1)で得られた溶液に添加し、攪拌して、混合スラリーを取得する。
(3)混合スラリーを噴霧乾燥機に移し、アルゴンガスを導入して、190℃で噴霧乾燥を行って、固体粉末材料を取得する。
(4)取得された固体粉末に対して、アルゴンガスの雰囲気下で熱処理を行い、熱処理温度が450℃であり、熱処理時間が4hであり、冷却した後、必要な負極活性材料が取得される。
(1)負極活性材料の重量減少率測定
(2)ボタン式電池の初回クーロン効率及びサイクル性能測定
負極活性材料の初回クーロン効率(%)=初回リチウム脱離容量/初回リチウム挿入容量×100%
負極活性材料のサイクル容量維持率(%)=50回目のリチウム脱離容量/初回リチウム脱離容量×100%
Claims (23)
- 負極活性材料であって、
コア材及びその少なくとも一部の表面上のポリマー改質被覆層を含み、
前記コア材は、シリコン系負極材及び錫系負極材のうちの一種類又は複数種類であり、
前記負極活性材料は、熱重量分析測定において、不活性非酸化性ガスの雰囲気下で、温度が25℃から800℃まで昇温する過程で、重量減少率が、0.2%≦重量減少率≦2%を満たす、
負極活性材料。 - 前記重量減少率は、0.3%≦重量減少率≦1%を満たす、
請求項1に記載の負極活性材料。 - 前記ポリマー改質被覆層は、窒素元素を含有し、且つ、-C=N-結合を含む、
請求項1又は2に記載の負極活性材料。 - 負極活性材料における前記窒素元素の質量割合は、0.1%~0.65%である、
請求項3に記載の負極活性材料。 - 負極活性材料における前記窒素元素の質量割合は、0.15%~0.5%である、
請求項4に記載の負極活性材料。 - 前記ポリマー改質被覆層は、硫黄元素を含有し、且つ、-C-S-結合及び/又は-S-S-結合を含む、
請求項1乃至5のいずれか一項に記載の負極活性材料。 - 前記負極活性材料の体積粒径分布幅(Dv90-Dv10)/Dv50は、0.5~2.5である、
請求項1乃至6のいずれか一項に記載の負極活性材料。 - 前記負極活性材料の体積粒径分布幅(Dv90-Dv10)/Dv50は、0.8~2.0である、
請求項7に記載の負極活性材料。 - 前記負極活性材料の個数粒径Dn10は、0.17μm~3μmである、
請求項1乃至8のいずれか一項に記載の負極活性材料。 - 前記負極活性材料の個数粒径Dn10は、0.2μm~1.5μmである、
請求項9に記載の負極活性材料。 - 前記負極活性材料のX線回折スペクトルにおいて、回折角2θが19°~27°の位置に回折ピークを有し、且つ、半値幅が4°~12°である、
請求項1乃至10のいずれか一項に記載の負極活性材料。 - 前記半値幅が5°~10°である、
請求項11に記載の負極活性材料。 - 前記負極活性材料のラマンスペクトルにおいて、ラマンシフトが1320cm-1~1410cm-1及び1550cm-1~1650cm-1の位置にそれぞれ散乱ピークを有し、
ラマンシフトが1320cm-1~1410cm-1の位置での散乱ピークのピーク強度をIDとし、ラマンシフトが1550cm-1~1650cm-1の位置での散乱ピークのピーク強度をIGとすると、前記IDとIGとは、1.60≦ID/IG≦2.50を満たす、
請求項1乃至12のいずれか一項に記載の負極活性材料。 - 前記I D とI G とは、1.80≦I D /IG≦2.40を満たす、
請求項13に記載の負極活性材料。 - 前記負極活性材料は、5トン(49KNに相当する)の圧力下で測定された圧密度が、1.1g/cm3~1.7g/cm3である、
請求項1乃至14のいずれか一項に記載の負極活性材料。 - 前記負極活性材料は、5トン(49KNに相当する)の圧力下で測定された圧密度が、1.2g/cm 3 ~1.5g/cm 3 である、
請求項15に記載の負極活性材料。 - 前記シリコン系負極材は、シリコン単量体、シリコン炭素複合体、シリコン酸素化合物、シリコン窒素化合物、及びシリコン合金のうちの一種類又は複数種類から選択され、
前記錫系負極材は、錫単量体、錫酸素化合物、及び錫合金のうちの一種類又は複数種類から選択される、
請求項1乃至16のいずれか一項に記載の負極活性材料。 - 前記シリコン系負極材は、シリコン酸素化合物から選択される、
請求項1乃至17のいずれか一項に記載の負極活性材料。 - 請求項1乃至18のいずれか一項に記載の負極活性材料を製造するための負極活性材料の製造方法であって、
ポリマー前駆体を溶媒で溶解し、均一に分散するまで攪拌する工程と、
シリコン系負極材及び錫系負極材のうちの一種類又は複数種類から選択されるコア材を、ポリマー前駆体溶液に添加し、攪拌して混合スラリーを取得する工程と、
混合スラリーを噴霧乾燥機又は湿式被覆機に入れて、不活性非酸化性ガスの雰囲気下で乾燥して、固体粉末を取得する工程と、
前記固体粉末を不活性非酸化性ガスの雰囲気下で、200℃~450℃の温度で熱処理して、負極活性材料を取得する工程と、
を含み、
前記負極活性材料は、コア材及びその少なくとも一部の表面上のポリマー改質被覆層を含み、
前記コア材は、シリコン系負極材及び錫系負極材のうちの一種類又は複数種類であり、
前記負極活性材料は、熱重量分析測定において、不活性非酸化性ガスの雰囲気下で、温度が25℃から800℃まで昇温する過程で、重量減少率が、0.2%≦重量減少率≦2%を満たす、
負極活性材料の製造方法。 - 請求項1乃至18のいずれか一項に記載の負極活性材料を含む電池。
- 請求項20に記載の電池を含む電池モジュール。
- 請求項21に記載の電池モジュールを含む電池パック。
- 請求項20に記載の電池、請求項21に記載の電池モジュール、又は、請求項22に記載の電池パックのうちの少なくとも一種を含む装置。
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