C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 31/04 (2006.01) H01M 4/24 (2006.01) H01M 4/26 (2006.01) H01M 4/58 (2006.01)
Patent
CA 2269388
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 d002 being preferably not larger than 3.3650 .ANG., 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.
Abe Masaru
Kamei Kazuhito
Kaminaka Hideya
Moriguchi Koji
Nagamine Masayuki
Gowling Lafleur Henderson Llp
Sony Corporation
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