Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2007-03-14
2010-02-09
Kalafut, Stephen J. (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C423S275000, C423S448000
Reexamination Certificate
active
07659033
ABSTRACT:
A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/μm and not more than 1500/μm, and with d002being preferably not larger than 3.3650 Å, is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding 1500° C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500° C. for graphization and subsequently further heat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatment and the heat treatment in the inert gas.
REFERENCES:
patent: 5698341 (1997-12-01), Tamaki et al.
patent: 6764767 (2004-07-01), Moriguchi et al.
patent: 7214447 (2007-05-01), Moriguchi et al.
Abe Masaru
Kamei Kazuhito
Kaminaka Hideya
Moriguchi Koji
Nagamine Masayuki
K&L Gates LLP
Kalafut Stephen J.
Sony Corporation
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