Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same
First Claim
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1. A method for preparing a negative active material for a rechargeable lithium battery, comprising:
- mixing one or more compounds selected from the group consisting of B2O3, B2O, P2O5, P2O3, Li2O, Li2CO3, LiOH, GeO2, Al2O3, V2O5, 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.
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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.
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Citations
18 Claims
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1. A method for preparing a negative active material for a rechargeable lithium battery, comprising:
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mixing one or more compounds selected from the group consisting of B2O3, B2O, P2O5, P2O3, Li2O, Li2CO3, LiOH, GeO2, Al2O3, V2O5, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for preparing a negative active material for a rechargeable lithium battery, comprising:
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mixing SiO2 and Si with one or more compounds selected from the group consisting of B2O3, B2O, P2O5, P2O3, Li2O, Li2CO3, LiOH, GeO2, Al2O3, and V2O5 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; andmixing the silicon-based composite with a carbonaceous material. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification