公开(公告)号：US20170117544A1

公开(公告)日：2017-04-27

申请号：US15362103

申请日：2016-11-28

Applicant: GS YUASA INTERNATIONAL LTD.

Inventor： Daisuke Endo ,  Yoshihiro Katayama ,  Tetsuya Murai ,  Masafumi Shibata

IPC: H01M4/505 ,  H01M10/0525 ,  C01G53/00 ,  H01M4/525

CPC classification number: H01M4/505 ,  C01G45/1221 ,  C01G45/1228 ,  C01G51/44 ,  C01G51/50 ,  C01G53/44 ,  C01G53/50 ,  C01P2002/72 ,  C01P2002/74 ,  C01P2002/77 ,  C01P2004/61 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01B1/08 ,  H01M4/0471 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/028 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: An object of the present invention is to provide a positive active material for a nonaqueous electrolyte secondary battery which has a large discharge capacity and is superior in charge-discharge cycle performance, initial efficiency and high rate discharge performance, and a nonaqueous electrolyte secondary battery using the positive active material. The present invention pertains to a positive active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an α-NaFeO2 type, is represented by a compositional formula Li1+αMe1−αO2 (Me is a transition metal element including Co, Ni and Mn, α>0), and has a molar ratio Li/Me of Li to the transition metal element Me of 1.2 to 1.6, wherein a molar ratio Co/Me of Co in the transition metal element Me is 0.02 to 0.23, a molar ratio Mn/Me of Mn in the transition metal element Me is 0.62 to 0.72, and the lithium transition metal composite oxide is observed as a single phase attributed to a space group R3-m on an X-ray diffraction chart when it is electrochemically oxidized up to a potential of 5.0 V (vs. Li/Li+).

公开(公告)号：US10297822B2

公开(公告)日：2019-05-21

申请号：US15362103

申请日：2016-11-28

Applicant: GS YUASA INTERNATIONAL LTD.

Inventor： Daisuke Endo ,  Yoshihiro Katayama ,  Tetsuya Murai ,  Masafumi Shibata

IPC: H01B1/08 ,  H01M4/04 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  C01G45/12 ,  C01G51/00 ,  C01G53/00 ,  H01M10/052 ,  H01M4/02

Abstract: An object of the present invention is to provide a positive active material for a nonaqueous electrolyte secondary battery which has a large discharge capacity and is superior in charge-discharge cycle performance, initial efficiency and high rate discharge performance, and a nonaqueous electrolyte secondary battery using the positive active material. The present invention pertains to a positive active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an α-NaFeO2 type, is represented by a compositional formula Li1+αMe1−αO2 (Me is a transition metal element including Co, Ni and Mn, α>0), and has a molar ratio Li/Me of Li to the transition metal element Me of 1.2 to 1.6, wherein a molar ratio Co/Me of Co in the transition metal element Me is 0.02 to 0.23, a molar ratio Mn/Me of Mn in the transition metal element Me is 0.62 to 0.72, and the lithium transition metal composite oxide is observed as a single phase attributed to a space group R3-m on an X-ray diffraction chart when it is electrochemically oxidized up to a potential of 5.0 V (vs. Li/Li+).