Invention Grant
- Patent Title: Non-aqueous secondary battery-use graphite composite particle, cathode active substance material containing IT, cathode and non-aqueous secondary battery
- Patent Title (中): 非水二次电池用石墨复合颗粒,含有IT的正极活性物质材料,阴极和非水二次电池
-
Application No.: US11993902Application Date: 2006-06-26
-
Publication No.: US07897283B2Publication Date: 2011-03-01
- Inventor: Hitoshi Matsumoto , Hideharu Satoh
- Applicant: Hitoshi Matsumoto , Hideharu Satoh
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: Mitsubishi Chemical Corporation,Tokai Carbon Co., Ltd.
- Current Assignee: Mitsubishi Chemical Corporation,Tokai Carbon Co., Ltd.
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JPP.2005-186597 20050627
- International Application: PCT/JP2006/312758 WO 20060626
- International Announcement: WO2007/000982 WO 20070104
- Main IPC: H01M4/58
- IPC: H01M4/58

Abstract:
To provide a nonaqueous secondary battery ensuring that a charge-discharge irreversible capacity at an initial cycle is sufficiently small even when an active material layer comprising a negative electrode active material on a current collector is increased in a density for obtaining a high capacity.This object is attained by a graphite composite particle for a nonaqueous secondary battery, which satisfies the requirements (1) and (2): (1) DL/DS is more than 1 and 2 or less, wherein DL μm means a volume-based median size measured by a laser diffraction/scattering-type particle size distribution measuring apparatus, and DS μm means an average circle-equivalent particle size which is determined from a measured area S of particles each having a contour not overlapped with a contour of another particle in a SEM; and (2) a Raman R value is 0.04 or more and 0.14 or less, wherein the Raman R value means an intensity ratio IB/IA between an intensity IA of a maximum peak of 1580 cm−1 around and an intensity IB of a maximum peak of 1360 cm−1 around in a Raman spectrum.
Public/Granted literature
Information query