Title:
GRAPHITE MATERIAL, METHOD FOR PRODUCING SAME, CARBON MATERIAL FOR BATTERY ELECTRODES, AND BATTERY
Document Type and Number:
WIPO Patent Application WO/2013/051678
Kind Code:
A1
Abstract:
The present invention provides: a graphite material which is suitable as an electrode material for nonaqueous electrolyte secondary batteries; a method for producing the graphite material; a carbon material for battery electrodes; and an excellent secondary battery which has an extremely small irreversible capacity, while maintaining charge/discharge cycle characteristics, large-current load characteristics and discharge capacity at high levels.
A graphite material, wherein the oxygen amount (a) (mass%) in the region from the particle surface to 40 nm in the depth direction is within the range of 0.010 ≤ a ≤ 0.04 as determined by the peak intensity of O1s obtained by HAX-PES measurement using a hard X-ray of 7,940 eV, can be used as a carbon material for battery electrodes that have excellent initial efficiency and small irreversible capacity, while maintaining large-current load characteristics, cycle characteristics and discharge capacity at high levels.
Inventors:
SUDOH AKINORI (JP)
KAMIJOU YUUICHI (JP)
TANAKA MASAKO (JP)
ABE TOMOHIRO (JP)
KAMIJOU YUUICHI (JP)
TANAKA MASAKO (JP)
ABE TOMOHIRO (JP)
Application Number:
PCT/JP2012/075891
Publication Date:
April 11, 2013
Filing Date:
October 05, 2012
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
C01B31/04; H01M4/587
Foreign References:
| JPS56500534A | 1981-04-23 | |||
| JPH07257915A | 1995-10-09 | |||
| JPH07320740A | 1995-12-08 | |||
| JPH09180721A | 1997-07-11 | |||
| JP2000340232A | 2000-12-08 |
Other References:
HIDEHARU NIWA ET AL.: "X-ray photoemission spectroscopy analysis of N-containing carbon-based cathode catalysts for polymer electrolyte fuel cells", JOURNAL OF POWER SOURCES, vol. 196, no. 3, 1 February 2011 (2011-02-01), pages 1006 - 1011, XP027450409, DOI: doi:10.1016/j.jpowsour.2010.08.054
F.F. KURP ET AL.: "Electron momentum density of graphite from (y,ey) spectroscopy", NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B, vol. 122, 1997, pages 269 - 273, XP004057993, DOI: doi:10.1016/S0168-583X(96)00828-2
F.F. KURP ET AL.: "Electron momentum density of graphite from (y,ey) spectroscopy", NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B, vol. 122, 1997, pages 269 - 273, XP004057993, DOI: doi:10.1016/S0168-583X(96)00828-2
Attorney, Agent or Firm:
OHIE Kunihisa et al. (JP)
Landlord Kunihisa (JP)
Landlord Kunihisa (JP)
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Claims: