发明公开
EP2626933A1 GRAPHITE MATERIAL WITH LATTICE DISTORTION FOR USE IN LITHIUM-ION SECONDARY BATTERY NEGATIVE ELECTRODES, AND LITHIUM-ION SECONDARY BATTERY
审中-公开
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- 专利标题： GRAPHITE MATERIAL WITH LATTICE DISTORTION FOR USE IN LITHIUM-ION SECONDARY BATTERY NEGATIVE ELECTRODES, AND LITHIUM-ION SECONDARY BATTERY
- 专利标题（中）： IE IAL IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE IE
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申请号： EP11830734.7申请日： 2011-10-06
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公开(公告)号： EP2626933A1公开(公告)日： 2013-08-14
- 发明人: SUZUKI, Takashi , ISHIMARU, Noriyo , OYAMA, Takashi , TANO, Tamotsu , ODA, Toshiyuki , FUJINAGA, Ippei , URAI, Tomoaki , OKAZAKI, Seiji , KURATA, Katsuaki , HIRAMOTO, Toshiaki , SATO, Akino , ODA, Wataru
- 申请人： JX Nippon Oil & Energy Corporation , Toda Kogyo Corporation
- 申请人地址： 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-8162 JP
- 专利权人： JX Nippon Oil & Energy Corporation,Toda Kogyo Corporation
- 当前专利权人： JX Nippon Oil & Energy Corporation,Toda Kogyo Corporation
- 当前专利权人地址： 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-8162 JP
- 代理机构： Müller-Boré & Partner Patentanwälte
- 优先权： JP2010228988 20101008
- 国际公布： WO2012046802 20120412
- 主分类号： H01M4/587
- IPC分类号： H01M4/587 ; C01B31/04
摘要：
Provided is a carbon material for negative electrode capable of suppressing capacity degradation due to repeated charge and discharge cycles, storage while being charged or floating charge.
A graphite material having lattice distortion for lithium-ion secondary battery negative electrode is obtained by a manufacturing method comprising the steps of: pulverizing and classifying a raw coke composition obtained from a heavy-oil composition undergone coking by delayed coking process, the raw coke composition having a H/C atomic ratio that is a ratio of hydrogen atoms H and carbon atoms C of 0.30 to 0.50 and having a micro-strength of 7 to 17 mass% to obtain powder of the raw coke composition; giving compressive stress and shear stress to the powder of the raw coke composition so that average circularity is 0.91 to 0.97 to obtain round powder; heating the round powder to obtain a carbonized composition; and graphitizing the carbonized composition. The graphite material has a size of a crystallite Lc(112) of 4 nm to 30 nm, the size being calculated from a (112) diffraction line obtained by X-ray wide-angle diffractometry, and has lattice distortion in the range from 0.001 to 0.085, the lattice distortion being calculated from a (004) diffraction line and a (006) diffraction line.
A graphite material having lattice distortion for lithium-ion secondary battery negative electrode is obtained by a manufacturing method comprising the steps of: pulverizing and classifying a raw coke composition obtained from a heavy-oil composition undergone coking by delayed coking process, the raw coke composition having a H/C atomic ratio that is a ratio of hydrogen atoms H and carbon atoms C of 0.30 to 0.50 and having a micro-strength of 7 to 17 mass% to obtain powder of the raw coke composition; giving compressive stress and shear stress to the powder of the raw coke composition so that average circularity is 0.91 to 0.97 to obtain round powder; heating the round powder to obtain a carbonized composition; and graphitizing the carbonized composition. The graphite material has a size of a crystallite Lc(112) of 4 nm to 30 nm, the size being calculated from a (112) diffraction line obtained by X-ray wide-angle diffractometry, and has lattice distortion in the range from 0.001 to 0.085, the lattice distortion being calculated from a (004) diffraction line and a (006) diffraction line.
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