发明授权
- 专利标题： Positive electrode active material for secondary cell and nonaqueous electrolyte secondary cell using the same, and method for analysis of positive electrode active material for secondary cell
- 专利标题（中）： 二次电池用正极活性物质及使用其的非水电解质二次电池以及二次电池用正极活性物质的分析方法
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申请号： US11812585申请日： 2007-06-20
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公开(公告)号： US08409754B2公开(公告)日： 2013-04-02
- 发明人: Ryo Sakai , Yasuhiro Shirakawa , Hajime Takeuchi , Yasumasa Ooya , Koshin Tanaka , Kazuki Amemiya , Shouta Endou
- 申请人： Ryo Sakai , Yasuhiro Shirakawa , Hajime Takeuchi , Yasumasa Ooya , Koshin Tanaka , Kazuki Amemiya , Shouta Endou
- 申请人地址： JP Tokyo
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JP Tokyo
- 代理机构： Foley & Lardner LLP
- 优先权： JP2001-195174 20010627
- 主分类号： H01M4/505
- IPC分类号： H01M4/505 ; H01M4/525 ; B01J8/02
摘要：
A positive electrode active material for use in a non-aqueous electrolyte secondary cell comprises a powdery metal oxide (LiCoO2, LiNiO2, LiMn2O4 or the like). When the positive electrode active material is classified with a classification precision index κ of 0.7 or greater so as to obtain a coarse powder having a classification ratio in a range of 0.1% to 5%, a ratio (B/A) of the content (B) of an impurity metal element in the coarse powder obtained by the classification to the content (A) of the impurity metal element in the powder before the classification is 1.5 or less. The contents of the impurity metal elements are compared with respect to Ca, Mn, Fe, Cr, Cu, Zn and the like (exclusive of the metal element constituting the powdery metal oxide). The positive electrode active material for a secondary cell serves to improve cell performance capabilities and production yields.