Patent ID: 9391315
Filing Date: 2016-07-12
CPC Classification: H01M,Y02E,Y02P

Claim Text:
1. A negative electrode for a lithium ion battery, comprising: a negative electrode current collector; a negative electrode active material layer containing silicon; and a lithium silicate layer that contains lithium, oxygen, and silicon forming a Li—O—Si bond, the lithium silicate layer being formed at the interface between the negative electrode current collector and the negative electrode active material layer, the lithium silicate layer having a higher oxygen content ratio than the negative electrode active material layer, the lithium silicate layer having oxygen to silicon content ratio greater than or equal to 1.3 and less than 2, wherein each of the negative electrode active material layer and the lithium silicate layer essentially consists of lithium, oxygen and silicon, and the Li—O—Si bond does not contribute to charge-discharge reactions.