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1. (WO2018053699) SECONDARY BATTERY AND CATHODE PIECE OF SAME

Pub. No.:    WO/2018/053699    International Application No.:    PCT/CN2016/099552
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Thu Sep 22 01:59:59 CEST 2016
IPC: H01M 4/36
H01M 4/62
H01M 10/0525
Applicants: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
宁德时代新能源科技股份有限公司
Inventors: LI, Zhen Hua
李振华
ZOU, Wu Yuan
邹武元
JIN, Hai Zu
金海族
Title: SECONDARY BATTERY AND CATHODE PIECE OF SAME
Abstract:
Disclosed by the present invention are a secondary battery and a cathode piece for use in same. The cathode piece comprises a cathode current collector and a ternary active material layer, and the ternary active material layer comprises a cathode active material. Also comprised is a primer layer disposed on the cathode current collector, the ternary active material layer being disposed on the primer layer; the primer layer comprises a cathode active material, a conductive agent and a binder. The specific surface area of the cathode active material in the primer layer is greater than 1.2 times the specific surface area of the cathode active material in the ternary active material layer. In comparison to existing technology, the secondary battery of the present invention is provided with a primer layer between a cathode current collector and a ternary active material layer, and the specific surface area of the cathode active material in the primer layer is greater than 1.2 times the specific surface area of the cathode active material in the ternary active material layer, which increases the area of contact between the primer layer and the ternary active material layer and is conducive to reducing interface contact impedance, thereby improving the cycle performance of the secondary battery and reducing increase of internal resistance during use of the battery.