发明公开
EP2403802A1 COMPOSITE GRAPHITE PARTICLES AND LITHIUM SECONDARY BATTERY USING THE SAME
审中-公开
GRAPHITVERBUNDTEILCHEN UND LITHIUM-SEKUNDÄRBATTERIEDAMIT
- 专利标题： COMPOSITE GRAPHITE PARTICLES AND LITHIUM SECONDARY BATTERY USING THE SAME
- 专利标题（中）： GRAPHITVERBUNDTEILCHEN UND LITHIUM-SEKUNDÄRBATTERIEDAMIT
-
申请号： EP09841126.7申请日： 2009-03-02
-
公开(公告)号： EP2403802A1公开(公告)日： 2012-01-11
- 发明人: SOTOWA, Chiaki , SUDOH, Akinori , TAKEUCHI, Masataka , HAN, Kyung-hee , HAN-Jung-min , OH, Jung-hun
- 申请人： Showa Denko K.K. , LS Mtron, Ltd.
- 申请人地址： 13-9, Shiba Daimon 1-chome Minato-ku Tokyo 105-8518 JP
- 专利权人： Showa Denko K.K.,LS Mtron, Ltd.
- 当前专利权人： Showa Denko K.K.,LS Mtron, Ltd.
- 当前专利权人地址： 13-9, Shiba Daimon 1-chome Minato-ku Tokyo 105-8518 JP
- 代理机构： Strehl, Peter
- 国际公布： WO2010100764 20100910
- 主分类号： C01B31/04
- IPC分类号： C01B31/04
摘要：
The present invention provides composite graphite particles, which are useful for a negative electrode in a secondary battery having high capacitance, good charge- discharge characteristics and good charge-discharge cycle characteristics; and a paste for negative electrode, a negative electrode and a lithium secondary battery which use the composite graphite particles. The composite graphite particles of the present invention comprises a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less in which the intensity ratio I
D /I
G (R value) between the peak intensity (I
D ) in a range of 1300 to 1400 cm
-1 and the peak intensity ( I
G ) in a range of 1580 to 1620 cm
-1 as measured by Raman spectroscopy spectra is from 0.01 to 0.1 and a carbonaceous surface layer in which the intensity ratio I
D /I
G (R value) between the peak intensity (I
D ) in a range of 1300 to 1400 cm
-1 and the peak intensity ( I
G ) in a range of 1580 to 1620 cm
-1 as measured by Raman scattering spectroscopy is 0.2 or higher; wherein the peak intensity ratio I
110 /I
004 between the peak intensity (I
004 ) of face (110) and the peak intensity (I
004 ) of face (004) obtained by XRD measurement on the graphite crystal is 0.2 or higher when the particles are mixed with a binder and pressure-molded to a density of 1.55 to 1.65 g/cm
3 .
D /I
G (R value) between the peak intensity (I
D ) in a range of 1300 to 1400 cm
-1 and the peak intensity ( I
G ) in a range of 1580 to 1620 cm
-1 as measured by Raman spectroscopy spectra is from 0.01 to 0.1 and a carbonaceous surface layer in which the intensity ratio I
D /I
G (R value) between the peak intensity (I
D ) in a range of 1300 to 1400 cm
-1 and the peak intensity ( I
G ) in a range of 1580 to 1620 cm
-1 as measured by Raman scattering spectroscopy is 0.2 or higher; wherein the peak intensity ratio I
110 /I
004 between the peak intensity (I
004 ) of face (110) and the peak intensity (I
004 ) of face (004) obtained by XRD measurement on the graphite crystal is 0.2 or higher when the particles are mixed with a binder and pressure-molded to a density of 1.55 to 1.65 g/cm
3 .
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