公开(公告)号：US20170250401A1

公开(公告)日：2017-08-31

申请号：US15437756

申请日：2017-02-21

Applicant: TDK CORPORATION

Inventor： Tetsu SYOJI ,  Hideaki SEKI ,  Hirofumi KAKUTA ,  Shin FUJITA

IPC: H01M4/36 ,  H01M4/58 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M4/13 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode includes: a positive electrode current collector; and a positive electrode active material layer disposed on the positive electrode current collector. The positive electrode active material layer contains a lithium-containing transition metal oxide represented by composition formula (1) indicated below, and a compound represented by LiVOPO4. The lithium-containing transition metal oxide and the compound represented by LiVOPO4 are dispersed in the positive electrode active material layer. LitNixCoyAlzO2   (1) where 0.9

公开(公告)号：US20170250402A1

公开(公告)日：2017-08-31

申请号：US15438133

申请日：2017-02-21

Applicant: TDK CORPORATION

Inventor： Tetsu SYOJI ,  Hideaki SEKI

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/62 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M4/13 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/625 ,  H01M10/0525 ,  Y02T10/7011

Abstract: A positive electrode active material for a lithium ion secondary battery includes: a first active material selected from active materials represented by composition formula (1); and a second active material represented by composition formula (2). A ratio a/b of an average particle diameter a of the first active material to an average particle diameter b of the second active material is in a range of 1≦a/b≦60. LiwNix(M1)y(M2)zO2   (1) where M1 is at least one element selected from Co and Mn, M2 is at least one element selected from Al, Fe, Cr, Ba, Mn, and Mg, 0.9