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US 2003/0143463 A1Published application
Carbon-based active material for rechargeable lithium battery, rechargeable lithium battery, and method of preparing carbon-based active material
AssigneeSamsung SDI Co., Ltd.
InventorsSANG-YOUNG YOON, MISHIMA RYOJI, TSUNO TOSHIAKI, MATSUBARA KEIKO
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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.
Claims4
A carbon-based active material for a rechargeable lithium battery, the material comprising a surface without hydroxyl groups and C—F bonds.
A rechargeable lithium battery comprising:
- a positive active material into or from which lithium ions are intercalated or deintercalated;
- and
- a negative carbon-based active material into or from which lithium ions are intercalated or deintercalated, the negative carbon-based active material comprising a surface without hydroxyl groups and C—F bonds.
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 such that hydroxyl groups are removed from a surface thereof without the generation of C—F bonds.
Dependencies are inferred from the claim text.