Invention Grant
- Patent Title: Negative electrode for lithium secondary battery, method for producing carbon-based negative electrode active material, lithium secondary battery and use thereof
- Patent Title (中): 锂二次电池用负极,碳系负极活性物质的制造方法,锂二次电池及其用途
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Application No.: US12673455Application Date: 2008-08-08
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Publication No.: US08841029B2Publication Date: 2014-09-23
- Inventor: Chiaki Sotowa , Akinori Sudoh , Masataka Takeuchi
- Applicant: Chiaki Sotowa , Akinori Sudoh , Masataka Takeuchi
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2007-208853 20070810
- International Application: PCT/JP2008/064343 WO 20080808
- International Announcement: WO2009/022664 WO 20090219
- Main IPC: H01M4/58
- IPC: H01M4/58 ; H01M4/133 ; H01M4/1393 ; H01M4/04 ; H01M4/587 ; H01M4/02

Abstract:
Disclosed are a negative electrode for lithium secondary batteries, containing an active material (A) capable of absorbing/desorbing lithium ions and a binder (B), wherein the active material (A) is a carbon-based material obtained from at least one starting material selected from a group consisting of petroleum cokes and coal cokes and having a mean particle size of from 1 to 30 and a true density of from 1.90 to 2.00 g/cm3 and its use; and a method for producing a carbon-based negative electrode active material having a mean particle size of from 1 to 30 μm and a true density of from 1.90 to 2.00 g/cm3, the method comprising (a) a step of grinding at least one selected from a group consisting of petroleum cokes and coal cokes, (b) a step of controlling the particle size, and (c) a step of heat-treating in an inert gas atmosphere at 900 to 1900° C.
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