Search International and National Patent Collections

1. (WO2017057078) POSITIVE ELECTRODE MATERIAL, METHOD FOR PRODUCING SAME AND LITHIUM ION SECONDARY BATTERY

Pub. No.:    WO/2017/057078    International Application No.:    PCT/JP2016/077558
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Sat Sep 17 01:59:59 CEST 2016
IPC: H01M 4/525
H01M 4/36
H01M 4/505
Applicants: HITACHI METALS, LTD.
日立金属株式会社
Inventors: TOYAMA Tatsuya
遠山 達哉
TAKAHASHI Shin
高橋 心
TOKORO Hisato
所 久人
GUNJI Akira
軍司 章
TAKANO Shuichi
高野 秀一
NAKABAYASHI Takashi
中林 崇
Title: POSITIVE ELECTRODE MATERIAL, METHOD FOR PRODUCING SAME AND LITHIUM ION SECONDARY BATTERY
Abstract:
Provided is a positive electrode material which enables a lithium ion secondary battery to have a good balance between high energy density and high cycle characteristics. A positive electrode material according to the present invention contains first active material particles and second active material particles. The first active material particles and the second active material particles are formed of an Li compound which has a layered structure and wherein the Ni concentration in a metal element other than Li is more than 70 atom%. The weight W1 of the first active material particles 11 is larger than the weight W2 of the second active material particles 12. The average particle diameter D1 of the first active material particles 11 is larger than the average particle diameter D2 of the second active material particles 12. The particle strength St1 of the first active material particles 11 is higher than the particle strength St2 of the second active material particles 12. The average particle diameter Dave of a mixture of the first active material particles and the second active material particles satisfies inequality expression 0.88 > (D1 - D2)/Dave > 0.50.