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 negative active material for a rechargeable lithium battery, comprising:
- a silicon-based composite core of a uniform phase 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, Al, and V, wherein the one or more elements are included in a range of 6.2 wt% to 50 wt % based on the total weight of the silicon-based composite core; and
a carbonaceous material coating layer on the surface of the silicon-based composite core.
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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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11 Claims
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1. A negative active material for a rechargeable lithium battery, comprising:
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a silicon-based composite core of a uniform phase 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, Al, and V, wherein the one or more elements are included in a range of 6.2 wt% to 50 wt % based on the total weight of the silicon-based composite core; anda carbonaceous material coating layer on the surface of the silicon-based composite core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rechargeable lithium battery, comprising:
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a negative electrode including a negative active material comprising a carbonaceous material coating layer and a silicon-based composite core of a uniform phase 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, Al, and V, wherein the one or more elements are included in a range of 6.2 wt% to 50 wt % based on the total weight of the silicon-based composite core, wherein the carbonaceous material coating layer is on the surface of the silicon-based composite core;a positive electrode including a positive active material capable of reversibly intercalating/deintercalating lithium; and an electrolyte.
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Specification