公开(公告)号：US10424777B2

公开(公告)日：2019-09-24

申请号：US14533804

申请日：2014-11-05

申请人： SUMITOMO CHEMICAL CO., LTD.

发明人： Satoshi Takamatsu ,  Yukimitsu Wakasugi ,  Megumi Uchida

IPC分类号： H01M4/1315 ,  H01M4/36 ,  H01M4/38 ,  H01M4/40 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

摘要： To provide a cathode active material for a lithium ion secondary battery, which has high packing properties and high volume capacity density, and a method for its production. A cathode active material for a lithium ion secondary battery is used, which comprises a mixture B of a collection of many large particles having different particle sizes and a collection of many small particles having different particle sizes, wherein the function F(x) of a particle size x of a particle contained in the mixture B and its frequency F has a relation of the formula 1, the function E(x) of a particle size x of a particle contained in a mixture B′ after the mixture B is pressed and its frequency E has a relation of the formula 2, the rate of change of the median size μ′g relative to μg is at most 10%, and the rate of change of the median size μ′h relative to μh is at least 20%, F ⁡ ( x ) = A g × 1 2 ⁢ π ⁢ σ g ⁢ x ⁢ exp ⁢ { - ( log ⁢ ⁢ x - μ g ) 2 2 ⁢ σ g 2 } + A h × 1 2 ⁢ π ⁢ σ h ⁢ x ⁢ exp ⁢ { - ( log ⁢ ⁢ x - μ h ) 2 2 ⁢ σ h 2 } Formula ⁢ ⁢ 1 E ⁡ ( x ) = A g ′ × 1 2 ⁢ π ⁢ σ g ′ ⁢ x ⁢ exp ⁢ { - ( log ⁢ ⁢ x - μ g ′ ) 2 2 ⁢ σ g ′2 } + A h ′ × 1 2 ⁢ π ⁢ σ h ′ ⁢ x ⁢ exp ⁢ { - ( log ⁢ ⁢ x - μ h ′ ) 2 2 ⁢ σ h ′2 } Formula ⁢ ⁢ 2