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US 8,709,653 B2Granted
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
Life of this patent
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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.
Claims11
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.
1 more element
A rechargeable lithium battery, comprising:
- 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.
2 more elements
Dependencies are inferred from the claim text.