JP7083914B2 - 高分子系固体電解質を含む電極の製造方法及びこれによって製造された電極 - Google Patents
高分子系固体電解質を含む電極の製造方法及びこれによって製造された電極 Download PDFInfo
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Description
膨潤度(%)={(最初の高分子系固体電解質の体積-ソルベントアニーリング後の高分子系固体電解質の体積)/最初の高分子系固体電解質の体積}×100
実施例1
(1)電極の製造
スラリーの製作のために、電極活物質としてNCM811(LiNi0.8Co0.1Mn0.1O2)、導電材として気相成長炭素繊維(VGCF:Vapor grown carbon fiber)、高分子固体電解質(PEOとLiFSI((LiCF3SO2)2N)の混合物、PEO:LiFSIのモル比[EO]:[Li+]=20:1)及び酸化改善用添加剤としてコハク酸ニトリル(SN)を、80:3:16:1の重量比で混合し、アセトニトリルに投入して撹拌することで電極スラリーを製造した。厚さが20μmであるアルミニウム集電体を準備した。前記スラリーをドクターブレードを用いて前記集電体に塗布し、その結果物を120℃で4時間真空乾燥した。ロールプレス装置を用いて圧延工程を行い、2mAh/cm2の電極ローディング、電極活物質層の厚さが48μm、気孔度が22%である電極を得た。
(2)電池の製造
前記(1)で製造された電極を1.4875cm2の円形に打ち抜けて準備した。1.7671cm2の円形に切断したリチウム金属薄膜を対向電極として準備した。この二つの電極の間に50μm厚さの個体電解質膜(PEOとLiFSIとの混合物、PEO:LiFSIのモル比[EO]:[Li+]=20:1)を介在してコイン型ハーフセル(coin type half-cell)を製造した。
スラリーの製作のために、電極活物質としてNCM811(LiNi0.8Co0.1Mn0.1O2)、導電材としてVGCF、高分子固体電解質(PEOとLiFSI((LiCF3SO2)2N)の混合物、PEO:LiFSIのモル比[EO]:[Li+]=20:1)及び酸化改善用添加剤としてコハク酸ニトリル(SN)を、80:3:15:2の重量比にしたことを除いては、実施例1と同様にして電極及びセルを製作した。
実施例2で製作された電極を、100℃で6時間ソルベントアニーリングを行ったことを除いては、実施例1と同様にして電極及びセルを製作した。
電極活物質としてNCM811(LiNi0.8Co0.1Mn0.1O2)、導電材としてVGCF及び高分子固体電解質を80:3:17の重量比で混合し、アセトニトリルに投入し撹拌することで電極スラリーを製造したことを除いては、実施例1と同様の方法で電極及び電池を製作した。ソルベントアニーリング前に得られた電極活物質層の気孔度は22%であり、ソルベントアニーリング後に得られた電極活物質層の気孔度は12%であった。
ソルベントアニーリング工程を行わなかったことを除いては、実施例1と同様の方法で電極及び電池を製作した。収得した電極活物質層の気孔度は22%であった。
実施例1~3、並びに比較例1及び2の電池に対し、持続的な充電(Continuous Charge)を行い、電極内の副反応時間を評価した。評価は、60℃で0.05Cで4.25VまでCC充電し、その後、CV条件で持続的に電流を印加して評価した。製作された電池内の副反応による電流向上時間を確認し、下記の表1に示した。
Claims (7)
- 全固体電池用電極の製造方法であって、
a)電極活物質粒子、b)高分子系固体電解質、c)導電材、及びd)酸化改善用添加剤及び還元改善用添加剤のうち一つ以上の添加剤を含む電極活物質層製造用スラリーを準備する工程と、
前記スラリーを集電体の少なくとも一面にコーティングして予備電極を製造する工程と、
前記予備電極にソルベントアニーリング工程を行って電極を製造する工程と、を含み、
前記酸化改善用添加剤が、ニトリル系酸化防止剤、ホウ素系酸化防止剤、フェノール系酸化防止剤、硫黄系酸化防止剤、リン系酸化防止剤、メタロセン系酸化防止剤及びキノン系酸化防止剤より選択された一種以上であり、
前記還元改善用添加剤が、カーボネート系化合物、硫黄系化合物、及びリチウム塩系化合物より選択された一種以上である、全固体電池用電極の製造方法。 - 前記高分子系固体電解質は、溶媒化したリチウム塩に高分子樹脂が添加されて形成された固体高分子電解質である、請求項1に記載の全固体電池用電極の製造方法。
- 前記ソルベントアニーリング工程は、前記予備電極を密閉空間に入れる段階と、
前記密閉空間が気化した溶媒で充填される段階と、
前記気化した溶媒で充填された密閉空間において、前記予備電極が保持される段階と、を含む、請求項1または2に記載の全固体電池用電極の製造方法。 - 前記ソルベントアニーリング工程が1~72時間行われる、請求項1から3のいずれか一項に記載の全固体電池用電極の製造方法。
- 前記溶媒は、N,N’-ジメチルアセトアミド、N-メチルピロリドン、ジメチルスルホキシド及びN,N-ジメチルホルムアミドより選択された非プロトン性溶媒;及び水、メタノール、エタノール、プロパノール、N-ブタノール、イソプロピルアルコール、デカリン、酢酸及びグリセロールより選択されたプロトン性溶媒;のうち少なくとも一つを含む、請求項3に記載の全固体電池用電極の製造方法。
- 前記高分子系固体電解質は、気化した有機溶媒の浸潤によって体積が膨張する、請求項1から5のいずれか一項に記載の全固体電池用電極の製造方法。
- 前記気化した溶媒は、温度が15℃~200℃である、請求項3または5に記載の全固体電池用電極の製造方法。
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PCT/KR2019/005378 WO2019212315A1 (ko) | 2018-05-03 | 2019-05-03 | 고분자계 고체 전해질을 포함하는 전극의 제조 방법 및 그 방법으로 제조된 전극 |
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CN111463508A (zh) * | 2020-03-31 | 2020-07-28 | 珠海冠宇电池股份有限公司 | 一种含有自由基淬灭剂的固态电池 |
CN111725575A (zh) * | 2020-06-30 | 2020-09-29 | 昆山宝创新能源科技有限公司 | 高镍锂电池和汽车 |
CN114551791B (zh) * | 2021-07-29 | 2024-02-02 | 万向一二三股份公司 | 一种含单晶高镍正极材料的复合正极片及全固态电池 |
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US5523179A (en) * | 1994-11-23 | 1996-06-04 | Polyplus Battery Company | Rechargeable positive electrode |
JP3702318B2 (ja) * | 1996-02-09 | 2005-10-05 | 日本電池株式会社 | 非水電解質電池用電極及びその電極を用いた非水電解質電池 |
JPH1167211A (ja) * | 1997-08-12 | 1999-03-09 | Ricoh Co Ltd | 非水電解質二次電池 |
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CN111937190A (zh) | 2020-11-13 |
CN111937190B (zh) | 2023-06-20 |
EP3758106A1 (en) | 2020-12-30 |
KR20190127602A (ko) | 2019-11-13 |
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