Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same
AssigneeSamsung SDI Co., Ltd.
InventorsSang-Min Lee, Goo-Jin Jeong, Sung-Soo Kim, Yoshiaki Nitta
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Abstract
The present invention relates to a negative active material for a rechargeable lithium battery, which includes a silicon-based composite having a silicon oxide of the form SiOx where x≦1.5 and at least one element selected from the group consisting of B, P, Li, Ge, Al, and V, and a carbonaceous material. The negative active material of the present invention can improve the cycle-life and high-rate charge/discharge characteristics of a rechargeable lithium battery.
Claims20
A method for preparing a negative active material for a rechargeable lithium battery, comprising:
- mixing a compound selected from the group consisting of B-containing compounds, P-containing compounds, Li-containing compounds, Ge-containing compounds, Al-containing compounds, V-containing compounds, and combinations thereof, with SiO2 and Si to thereby produce a mixture;
- heat treating the mixture to prepare a silicon-based composite comprising a silicon oxide of the form SiOx where x≦1.5, and one or more elements selected from the group consisting of B, P, Li, Ge, Al, and V;
- quenching the silicon-based composite;
- and
- coating the silicon-based composite with a carbonaceous material.
A method for preparing a negative active material for a rechargeable lithium battery, comprising:
- mixing SiO2 and Si with one or more compounds selected from the group consisting of B-containing compounds, P-containing compounds, Li-containing compounds, Ge-containing compounds, Al-containing compounds, and V-containing compounds to thereby produce a mixture;
- heat treating the mixture to prepare a silicon-based composite comprising:
- a silicon oxide of the form SiOx where x≦1.5, and one or more elements selected from the group consisting of B, P, Li, Ge, Al, and V;
- and
- mixing the silicon-based composite with a carbonaceous material.
Dependencies are inferred from the claim text.