JPWO2011101987A1 - リチウムイオン二次電池とその製造方法 - Google Patents
リチウムイオン二次電池とその製造方法 Download PDFInfo
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- JPWO2011101987A1 JPWO2011101987A1 JP2012500438A JP2012500438A JPWO2011101987A1 JP WO2011101987 A1 JPWO2011101987 A1 JP WO2011101987A1 JP 2012500438 A JP2012500438 A JP 2012500438A JP 2012500438 A JP2012500438 A JP 2012500438A JP WO2011101987 A1 JPWO2011101987 A1 JP WO2011101987A1
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- Prior art keywords
- negative electrode
- positive electrode
- polymer
- active material
- mixture layer
- Prior art date
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Links
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Abstract
Description
正極活物質として、LiNi0.5Mn1.5O4で表わされる組成のリチウムマンガン酸化物を使用した。結着剤としてのポリフッ化ビニリデン(PVDF)25gをN−メチルピロリドン(NMP)625mLに溶解した溶液に、上記組成のリチウムマンガン酸化物粉末425gおよびアセチレンブラック50gとを投入し、均一に混合して、ペーストまたはスラリー状の組成物(正極合材層形成用組成物)を調製した。この組成物を、厚さ15μmの長尺状アルミニウム箔(正極集電体)の両面に塗布して乾燥させた。上記組成物の塗布量(固形分基準)は、両面合わせて約15mg/cm2となるように調整した。乾燥後、正極集電体とその両面の正極合材層とを合わせた全体の厚みが約70μmとなるようにプレスして、シート状正極(正極シート)を作製した。
例1で作製した負極シートを、ポリアクリル酸(重量平均分子量25×104)の2.5質量%エチルアルコール溶液に約5秒間浸漬した後、該溶液から引き上げて120℃で減圧乾燥させることにより、負極合材層の表面にポリアクリル酸を被覆した。上記被覆の前後における質量差および負極合材層の面積から算出したポリアクリル酸の被覆量は、負極合材層の面積1cm2当たり0.15mg(すなわち0.15mg/cm2)であった。このようにしてポリアクリル酸を被覆した負極シートを用いた点以外は例1と同様にして、電池サンプル2を構築した。
例2において、ポリアクリル酸エチルアルコール溶液におけるポリアクリル酸濃度を1.0質量%に変更した。その他の点は例2と同様にして、負極合材層にポリアクリル酸を被覆した。被覆量は0.10mg/cm2であった。このようにしてポリアクリル酸を被覆した負極シートを用いた点以外は例1と同様にして、電池サンプル3を構築した。
例2において、ポリアクリル酸の2.5質量%エチルアルコール溶液に代えて、ポリアクリル酸の2.5質量%水溶液を使用した。その他の点は例2と同様にして、負極合材層にポリアクリル酸を被覆した。被覆量は0.10mg/cm2であった。このようにしてポリアクリル酸を被覆した負極シートを用いた点以外は例1と同様にして、電池サンプル4を構築した。
例2において、ポリアクリル酸の2.5質量%エチルアルコール溶液に代えて、ポリアクリル酸エチル(重量平均分子量25×104)の2.5質量%トルエン溶液を使用した。その他の点は例2と同様にして、負極合材層にポリアクリル酸エチルを被覆した。被覆量は0.10mg/cm2であった。このようにしてポリアクリル酸エチルを被覆した負極シートを用いた点以外は例1と同様にして、電池サンプル5を構築した。
例2において、ポリアクリル酸の2.5質量%エチルアルコール溶液に代えて、ポリアクリル酸ナトリウム(重合度22×103〜70×103)の2.5質量%水溶液を使用した。その他の点は例2と同様にして、負極合材層にポリアクリル酸ナトリウムを被覆した。被覆量は0.10mg/cm2であった。このようにしてポリアクリル酸ナトリウムを被覆した負極シートを用いた点以外は例1と同様にして、電池サンプル6を構築した。
本例では、正極活物質として、LiNi0.8Co0.15Al0.05O4で表わされる組成のリチウムニッケル酸化物を使用した。このリチウムニッケル酸化物の粉末を用いて例1と同様に正極合材層形成用組成物を調製し、厚さ15μmの長尺状アルミニウム箔(正極集電体)の両面に塗布して乾燥させた。上記組成物の塗布量(固形分基準)は、両面合わせて約13mg/cm2となるように調整した。乾燥後、正極集電体とその両面の正極合材層とを合わせた全体の厚みが約65μmとなるようにプレスして、シート状正極(正極シート)を作製した。この正極シートを負極シート(ポリマー被覆なし)および二枚の長尺状のセパレータシートと積層し、例1と同様にして電池サンプル7を構築した。
本例では、例7の正極シートと例2のポリアクリル酸被覆負極シートとを組み合わせて使用した。その他の点については例1と同様にして、電池サンプル8を構築した。
各電池サンプルに対し、理論容量の0.1C(1Cは、1時間で満充放電可能な電流値)のレートで両端子間の電圧が4.9V(ただし、電池サンプル7,8については4.1V)となるまで定電流充電する操作と、両端子間の電圧が3.0Vとなるまで0.1Cで定電流放電させる操作とを3サイクル行った。次いで、1Cのレートで4.9V(電池サンプル7,8については4.1V)まで定電流充電し、続いて合計充電時間が2時間となるまで定電圧充電した後、1Cのレートで3.0Vまで定電流放電させ、このときの容量を初期放電容量(mAh)として測定した。なお、以上の操作は25℃にて行った。
上記初期放電容量測定後の電池サンプルに対し、1Cのレートで4.9V(電池サンプル7,8については4.1V)まで定電流充電した後に合計充電時間が2時間となるまで定電圧充電する操作と、1Cのレートで3.0Vまで定電流放電させる操作とを100サイクル行った。以上の操作は25℃にて行った。そして、1サイクル目の放電容量に対する100サイクル目の放電容量の割合を容量維持率として算出した。
Claims (10)
- マンガンを含む正極活物質を有する正極と、
負極活物質を有する負極と、
前記正極と前記負極との間に介在される非水電解液と、
前記正極活物質と前記負極活物質との間に配置された酸性基含有ポリマーと、
を備える、リチウムイオン二次電池。 - 前記ポリマーは、モノマー組成としてアクリル酸およびメタクリル酸の少なくとも一方を含む重合体である、請求項1に記載の電池。
- 前記ポリマーはポリアクリル酸である、請求項1または2に記載の電池。
- 前記ポリマーは、該ポリマーの有機溶媒溶液から該有機溶媒を除去して配置されたものである、請求項1から3のいずれか一項に記載の電池。
- 前記ポリマーは、前記正極に直接接触しない箇所に配置されている、請求項1から4のいずれか一項に記載の電池。
- 前記負極は、前記負極活物質を含む負極合材層を備え、前記ポリマーは前記負極合材層上に配置されている、請求項1から5のいずれか一項に記載の電池。
- 前記負極合材層の面積1cm2当たり前記ポリマー0.01mg〜0.20mgが配置されている、請求項6に記載の電池。
- 前記正極活物質はスピネル型リチウムマンガン酸化物である、請求項1から7のいずれか一項に記載の電池。
- マンガンを含む正極活物質を有する正極と、負極活物質を含む負極合材層を有する負極と、前記正極と前記負極との間に介在される非水電解液と、前記負極合材層上に配置された酸性基含有ポリマーと、を備えるリチウムイオン二次電池を製造する方法であって、
前記ポリマーの有機溶媒溶液を前記負極合材層に付与した後、該有機溶媒を除去して前記ポリマーを前記負極合材層上に配置する工程と、
前記ポリマーが配置された負極と前記正極とを前記電解液とともに容器に収容して電池を構築する工程と、
を包含する、リチウムイオン二次電池製造方法。 - 請求項1から8のいずれかに記載のリチウムイオン二次電池を備える、車両。
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BR112014031381B8 (pt) * | 2012-07-09 | 2023-01-17 | Lg Chemical Ltd | Material de catodo ativo de alta tensão e seu método de preparação, bateria secundária de lítio, bem como pacote e veículo elétrico que compreendem a dita bateria |
US10193157B2 (en) * | 2013-06-12 | 2019-01-29 | Tdk Corporation | Negative electrode for lithium ion secondary battery, and lithium ion secondary battery using the same |
KR101676408B1 (ko) | 2013-10-31 | 2016-11-15 | 주식회사 엘지화학 | 전극-분리막 복합체의 제조방법, 그 제조방법에 의해 제조된 전극-분리막 복합체 및 그를 포함하는 리튬 이차전지 |
JP6287186B2 (ja) * | 2013-12-26 | 2018-03-07 | 三洋電機株式会社 | 非水電解質二次電池 |
WO2015111166A1 (ja) * | 2014-01-23 | 2015-07-30 | 株式会社日立製作所 | リチウムイオン電池の正極活物質被覆用ポリマー |
JP6178493B2 (ja) * | 2014-03-12 | 2017-08-09 | 三洋化成工業株式会社 | リチウムイオン電池用被覆負極活物質、リチウムイオン電池用スラリー、リチウムイオン電池用負極、リチウムイオン電池、及び、リチウムイオン電池用被覆負極活物質の製造方法 |
JP6331763B2 (ja) * | 2014-06-26 | 2018-05-30 | 株式会社豊田自動織機 | 非水二次電池用電極の製造方法。 |
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