Invention Grant
- Patent Title: Negative electrode material for nonaqueous secondary cells, negative electrode for nonaqueous secondary cells, and nonaqueous secondary cell
- Patent Title (中): 非水系二次电池用负极材料,非水系二次电池用负极和非水系二次电池
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Application No.: US11661213Application Date: 2005-08-30
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Publication No.: US08404383B2Publication Date: 2013-03-26
- Inventor: Nobuyuki Onishi , Hideharu Satoh , Keita Yamaguchi
- Applicant: Nobuyuki Onishi , Hideharu Satoh , Keita Yamaguchi
- 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: JP2004-250415 20040830
- International Application: PCT/JP2005/015754 WO 20050830
- International Announcement: WO2006/025376 WO 20060309
- Main IPC: H01M4/13
- IPC: H01M4/13 ; C01B31/04

Abstract:
A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle and exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances is provided. The main component of the material is graphite particles. The median diameter is 5 μm or more, and 40 μm or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density is 0.7 g/cm3 or more. The specific surface area measured by a BET method is 0.2 m2/g or more, and 8 m2/g or less. The average circularity is 0.83 or more, and 1.00 or less. When an electrode is produced by a predetermined method for manufacturing an electrode and, the resulting electrode is subjected to X-ray diffraction, the graphite crystal orientation ratio I110/I004 on the electrode is 0.08 or more, where I110 represents the wide angle X-ray diffraction peak area of the (110) peak peak in the region of 2θ=76.5 to 78.5 degrees of the graphite particles on the electrode and I004 represents the wide angle X-ray diffraction peak area of the (004) peak peak in the region of 2θ=53.5 to 56 degrees.
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