Patent ID: 9577261
Date: 2017-02-21
CPC Classifications: C30B,H01M,Y02E,Y02P

Claim:
1. A lithium ion secondary battery comprising: a positive electrode comprising: a negative electrode; and an electrolyte provided between the positive electrode and the negative electrode, wherein each of the single crystal particles is a lithium-containing composite oxide, wherein the lithium-containing composite oxide is expressed by LiMPO wherein each of the single crystal particles is a flat single crystal particle, wherein in each of the single crystal particles, a length in a b-axis direction is shorter than each of lengths in an a-axis direction and a c-axis direction, and a b-plane has a square shape or a substantially square shape, wherein a ratio of lengths of the single crystal particles in the a-axis direction and the c-axis direction is greater than or equal to 0.8 and less than or equal to 1.2, and wherein each of the single crystal particles is provided over the positive electrode current collector so that a b-axis of each of the single crystal particles intersects with a surface of the positive electrode current collector.