发明名称 |
POSITIVE-ELECTRODE ACTIVE-MATERIAL POWDER AND MANUFACTURING METHOD THEREFOR |
摘要 |
A positive electrode active material for a lithium ion secondary cell, in which the amount of a transition metal present in the vicinity of the outermost surface thereof is significantly decreased is provided. A solid electrolyte-coated positive electrode active material powder contains particles of a positive electrode active material for lithium ion secondary cell, containing a composite oxide of Li and a transition metal M, having on a surface thereof a coating layer of a solid electrolyte represented by Li1+XAlXTi2−X(PO4)3, wherein 0 £×£ 0.5. An average proportion of a total atom number of Al, Ti and P in a total atom number of Al, Ti, M and P within an etching depth of 1 nm from the outermost surface determined by analysis in a depth direction with XPS is 50% or more. The transition metal M is, for example, at least one kind of Co, Ni and Mn. |
申请公布号 |
US2016093914(A1) |
申请公布日期 |
2016.03.31 |
申请号 |
US201414787004 |
申请日期 |
2014.05.06 |
申请人 |
DOWA HOLDINGS CO., LTD. |
发明人 |
TANOUE Koji;AIKI Yoshiaki |
分类号 |
H01M10/0562;H01M4/485;H01M4/525;H01M10/0525 |
主分类号 |
H01M10/0562 |
代理机构 |
|
代理人 |
|
主权项 |
1. Solid electrolyte-coated positive electrode active material powder comprising particles of a positive electrode active material for lithium ion secondary cell, containing a composite oxide of Li and a transition metal M, having on a surface thereof a coating layer of a solid electrolyte represented by Li1+XAlXTi2−X(PO4)3, wherein 0≦X≦0.5, an average proportion of a total atom number of Al and Ti in a total atom number of Al, Ti and M in the coating layer within an etching depth of 1 nm from the outermost surface thereof determined by analysis in a depth direction with XPS being 35% or more. |
地址 |
Tokyo JP |