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US 6,656,637 B2Granted
Carbon-based active material for rechargeable lithium battery and method of preparing carbon-based active material
AssigneeSamsung SDI Co., Ltd.
InventorsSang-Young Yoon, Mishima Ryoji, Tsuno Toshiaki, Matsubara Keiko
Life of this patent
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Abstract
Disclosed is a carbon-based active material for a rechargeable lithium battery that is capable of increasing charge and discharge efficiency of the battery. The carbon-based active material has no hydroxyl groups on a surface by heat-treating under a fluorine atmosphere.
Claims2
A method of preparing a carbon-based active material for a rechargeable lithium battery comprising the step of:
- heat-treating a carbon-based material under a fluorine atmosphere at a temperature of more than about 100° C. and less than or equal to 150° C. such that free hydroxyl groups, whose presence would be indicated by a peak at an absorption wave n of about 3600 cm−1, are removed from a surface thereof without the generation of C—F bonds whose presence would be indicated by a peak at an absorption wave number of about 1100 cm−1.
Dependencies are inferred from the claim text.