Negative active material containing an intermetallic compound of silicon and a first metal and a metal matrix containing copper and aluminum for rechargeable lithium battery and rechargeable lithium battery containing the negative active material
First Claim
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1. A negative active material for a rechargeable lithium battery, comprising an alloy comprising:
- an intermetallic compound of Si and a first metal M; and
a metal matrix comprising Cu and Al,wherein the negative active material is represented by Formula 1;
x(aSi-bM)-y(cCu-dAl)
Formula 1wherein x+y is 100 wt %, x ranges from about 30 to about 70 wt %, y ranges from about 30 to about 70 wt %, a+b is 100 wt %, a ranges from about 85 to about 90 wt %, b ranges from about 10 to about 15 wt %, c+d is 100 wt %, c ranges from about 70 to about 85 wt %, d ranges from about 15 to about 30 wt %, and the first metal M comprises a metal capable of changing a eutectic point of an alloy including Si, Cu, and Al.
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Abstract
Negative active materials and rechargeable lithium batteries including the negative active materials are provided. The negative active material includes an intermetallic compound of Si and a metal, and a metal matrix including Cu and Al. The negative active material may provide a rechargeable lithium battery having high capacity and excellent cycle-life and cell efficiency.
17 Citations
20 Claims
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1. A negative active material for a rechargeable lithium battery, comprising an alloy comprising:
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an intermetallic compound of Si and a first metal M; and a metal matrix comprising Cu and Al, wherein the negative active material is represented by Formula 1;
x(aSi-bM)-y(cCu-dAl)
Formula 1wherein x+y is 100 wt %, x ranges from about 30 to about 70 wt %, y ranges from about 30 to about 70 wt %, a+b is 100 wt %, a ranges from about 85 to about 90 wt %, b ranges from about 10 to about 15 wt %, c+d is 100 wt %, c ranges from about 70 to about 85 wt %, d ranges from about 15 to about 30 wt %, and the first metal M comprises a metal capable of changing a eutectic point of an alloy including Si, Cu, and Al. - 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 comprising a negative active material comprising an alloy comprising an intermetallic compound of Si and a first metal M, and a metal matrix comprising Cu and Al; a positive electrode comprising a positive active material capable of reversibly intercalating/deintercalating lithium ions; and an electrolyte, wherein the negative active material is represented by Formula 1;
x(aSi-bM)-y(cCu-dAl)
Formula 1wherein x+y is 100 wt %, x ranges from about 30 to about 70 wt %, y ranges from about 30 to about 70 wt %, a+b is 100 wt %, a ranges from about 85 to about 90 wt %, b ranges from about 10 to about 15 wt %, c+d is 100 wt %, c ranges from about 70 to about 85 wt %, d ranges from about 15 to about 30 wt %, and the first metal M comprises a metal capable of changing a eutectic point of an alloy including Si, Cu, and Al. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification