Invention Grant
- Patent Title: Positive electrode active material, method for manufacturing positive electrode active material and nonaqueous electrolyte battery
- Patent Title (中): 正极活性物质，正极活性物质和非水电解质电池的制造方法
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Application No.: US12761172Application Date: 2010-04-15
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Publication No.: US08771876B2Publication Date: 2014-07-08
- Inventor: Haruo Watanabe , Tomoyo Ooyama , Yosuke Hosoya , Shigeru Fujita
- Applicant: Haruo Watanabe , Tomoyo Ooyama , Yosuke Hosoya , Shigeru Fujita
- Applicant Address: PA Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: PA Tokyo
- Agency: K&L Gates LLP
- Priority: JPP2009-103791 20090422; JPP2009-144363 20090617
- Main IPC: H01M4/58
- IPC: H01M4/58 ; H01M4/00
Abstract:
A positive electrode active material includes a lithium complex oxide particle, and a coating layer formed on at least a part of the surface of the lithium complex oxide particle. The lithium complex oxide particle is a lithium complex oxide particle composed mainly of nickel. The coating layer contains an oxo acid and/or an oxo acid compound, an acidity of the surface of the lithium complex oxide particle composed mainly of nickel is increased by the coating layer. The acidity is determined based on a pH of a supernatant of water in a state where after 1.0 part by weight of the lithium complex oxide particle composed mainly of nickel and having a coating layer formed thereon is dispersed in 50 parts by weight of water. The lithium complex oxide particle sediments, and the pH is less than 8.0.
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