Invention Grant
- Patent Title: Composite graphite particles and lithium rechargeable battery using the same
- Patent Title (中): 复合石墨颗粒和锂可充电电池使用相同
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Application No.: US12097001Application Date: 2006-12-20
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Publication No.: US08999580B2Publication Date: 2015-04-07
- Inventor: Chiaki Sotowa , Masataka Takeuchi
- Applicant: Chiaki Sotowa , Masataka Takeuchi
- Applicant Address: JP Tokyo
- Assignee: Show A Denko K.K.
- Current Assignee: Show A Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2005-367910 20051221
- International Application: PCT/JP2006/325378 WO 20061220
- International Announcement: WO2007/072858 WO 20070628
- Main IPC: H01M4/13
- IPC: H01M4/13 ; H01M4/58 ; H01M10/0525 ; H01M4/133 ; H01M4/587 ; H01M10/0569 ; H01M4/02

Abstract:
The invention provides composite graphite particles, comprising a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less and a surface layer consisting of graphite in which the intensity ratio ID/IG (R value) between the peak intensities (ID) in a range of 1300 to 1400 cm−1 and ( IG) in a range of 1580 to 1620 cm−1 as measured by Raman scattering spectroscopy is 0.3 or higher, wherein the peak intensity ratio I110/I004 between the peak intensities (I110)of face (110) and (I004)of face (004) obtained by XRD measurement on the graphite crystal is 0.15 or higher when the graphite has been mixed with a binder and pressure-molded to a density of 1.55 to 1.65 g/cm3, which composite graphite particles are useful in a secondary battery negative electrode having a high capacity, high charge/discharge characteristics and an excellent charging property, and also provides a paste for negative electrode, a negative electrode and a lithium secondary battery using the composite graphite.
Public/Granted literature
- US20090202917A1 COMPOSITE GRAPHITE PARTICLES AND LITHIUM RECHARGEABLE BATTERY USING THE SAME Public/Granted day:2009-08-13
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