- Patent Title: Positive active material for lithium secondary battery, precursor of positive active material, electrode for lithium secondary battery and lithium secondary battery
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Application No.: US14790792Application Date: 2015-07-02
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Publication No.: US09478795B2Publication Date: 2016-10-25
- Inventor: Daisuke Endo , Hiromasa Muramatsu
- Applicant: GS YUASA INTERNATIONAL LTD.
- Applicant Address: JP Kyoto
- Assignee: GS Yuasa International Ltd.
- Current Assignee: GS Yuasa International Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Rankin, Hill & Clark LLP
- Priority: JP2012-138419 20120620; JP2012-138638 20120620; JP2013-051267 20130314
- Main IPC: H01M4/00
- IPC: H01M4/00 ; H01M4/131 ; H01M4/505 ; H01M4/525 ; H01M4/48 ; C01G53/00 ; H01M10/052 ; H01M4/02

Abstract:
Provided is a positive active material for a lithium secondary battery includes a lithium transition metal composite oxide having an α-NaFeO2-type crystal structure and represented by the composition formula of Li1+αMe1−αO2 (Me is a transition metal including Co, Ni and Mn and α>0). The positive active material contains Na in an amount of 900 ppm or more and 16000 ppm or less, or K in an amount of 1200 ppm or more and 18000 ppm or less.
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