- Patent Title: Positive-electrode material for lithium secondary battery, secondary battery employing the same, and process for producing positive-electrode material for lithium secondary battery
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Application No.: US13171498Application Date: 2011-06-29
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Publication No.: US08343664B2Publication Date: 2013-01-01
- Inventor: Kazuhiro Kikuchi , Koji Shima
- Applicant: Kazuhiro Kikuchi , Koji Shima
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Chemical Corporation
- Current Assignee: Mitsubishi Chemical Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2002-091473 20020328
- Main IPC: H01M4/485
- IPC: H01M4/485 ; C01G29/00 ; C01B35/10

Abstract:
A subject for the invention is to provide a positive-electrode material, which has high capacity and high output and is inhibited from suffering a decrease in output with repetitions of charge and use. The invention provides a positive-electrode material for lithium secondary battery, which comprises a secondary particle of a lithium/transition metal composite oxide containing boron and/or bismuth, and wherein the atomic ratio of the sum of boron and bismuth to the sum of the metallic elements other than lithium, boron, and bismuth in a surface part of the secondary particle is from 5 times to 70 times the atomic ratio in the whole secondary particle.
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