JP2023511234A - リチウム二次電池用電極の製造方法 - Google Patents
リチウム二次電池用電極の製造方法 Download PDFInfo
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- JP2023511234A JP2023511234A JP2022570089A JP2022570089A JP2023511234A JP 2023511234 A JP2023511234 A JP 2023511234A JP 2022570089 A JP2022570089 A JP 2022570089A JP 2022570089 A JP2022570089 A JP 2022570089A JP 2023511234 A JP2023511234 A JP 2023511234A
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Abstract
Description
活物質として天然黒鉛40重量%、導電材としてカーボンブラック(carbon black)0.8重量%、バインダーとしてスチレンブタジエンゴム0.7重量%及び増粘剤(CMC)0.7重量%を残りの量の蒸留水に添加して負極スラリー(固形分含量:42.2重量%)を準備した。
脱水工程を負圧レベルに圧力を下げて行うことを除いては、実施例1と同じ過程で負極を製造した。
活物質として天然黒鉛40重量%、導電材としてカーボンブラック0.8重量%、バインダーとしてスチレンブタジエンゴム0.7重量%及び増粘剤(CMC)0.7重量%を残りの量の蒸留水に添加して負極スラリー(固形分含量:42.2重量%)を準備した。
実施例1及び比較例1によって製造されたそれぞれの負極に対する乾燥速度を比較し、その結果を図2に示した。
実施例1及び比較例1によって製造された負極に対するSEMイメージをそれぞれ図3A及び図3Bに示した。
実施例1及び比較例1によって製造された負極を1.5cm×7cmの試片で製作した後、ガラス上に両面テープを用いて接着させた後、UTM装備(Comtech QC506B)を使用して、分当たり3mmの速度で両面テープから電極を取り外す時に必要な力、すなわち、剥離強度を測定した。その結果を図4に示した。
実施例1及び比較例1によって製造された負極が含まれたリチウム二次電池セルを製造し、充電0.1C、放電0.1C、30℃の条件下で初期容量に比べて、サイクル進行による容量を測定した。その結果を図5に示した。
Claims (10)
- (ステップS1)活物質、バインダー、導電材及び溶媒を含む電極スラリーを多孔性基材の一面に塗布した後、前記多孔性基材の反対側の面に脱水工程を行って電極層を形成する段階と、
(ステップS2)前記多孔性基材上に形成された電極層に電極集電体を積層させて、多孔性基材、電極層及び電極集電体が順次に積層された積層体を形成し、前記積層体を加圧して追加脱水を行う段階と、
(ステップS3)前記多孔性基材を電極層から分離した後、集電体上に形成された電極層を乾燥する段階と、を含む、電極の製造方法。 - 前記多孔性基材の気孔は、0.1~20μmの平均サイズを有する、請求項1に記載の電極の製造方法。
- 前記多孔性基材の気孔率が、50~95%である、請求項1に記載の電極の製造方法。
- 前記多孔性基材は、ポリマー、ガラス繊維、紙、金属またはセラミック材のメッシュ状である、請求項1に記載の電極の製造方法。
- 前記脱水工程は、負圧で減圧して行われる、請求項1に記載の電極の製造方法。
- 前記活物質は、リチウム二次電池用の正極活物質または負極活物質である、請求項1に記載の電極の製造方法。
- 前記正極活物質は、LiCoO2,LiNiO2,LiMn2O4,LiCoPO4,LiFePO4及びLiNi1-x-y-zCoxM1yM2zO2(M1及びM2は、互いに独立してAl,Ni,Co,Fe,Mn,V,Cr,Ti,W,Ta,Mg及びMoからなる群から選択された何れか1つであり、x,y及びzは、互いに独立して酸化物組成元素の原子分率として0≦x<0.5,0≦y<0.5,0≦z<0.5,0<x+y+z≦1である)からなる群から選択された何れか1つの活物質粒子またはこれらのうち2種以上の混合物を含む、請求項6に記載の電極の製造方法。
- 前記負極活物質は、天然黒鉛、人造黒鉛、炭素質材料;リチウム含有チタン複合酸化物(LTO),Si,Sn,Li,Zn,Mg,Cd,Ce,NiまたはFeである金属類(Me);前記金属類(Me)で構成された合金類;前記金属類(Me)の酸化物(MeOx);及び前記金属類(Me)と炭素との複合体からなる群から選択された何れか1つの活物質粒子またはこれらのうち2種以上の混合物を含む、請求項6に記載の電極の製造方法。
- 請求項1~8の何れか一項に記載の方法で製造され、電極内に含まれた空隙サイズ分布が、0.005~60μmであり、空隙平均サイズが、0.25~0.29μmである、電極。
- 請求項9に記載の電極を含む、リチウム二次電池。
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