Anode active material, method of preparing the same, and anode and lithium battery containing the material
First Claim
1. A method of preparing an anode active material for a lithium battery, the method comprising:
- mixing a metal particle powder, a polymer material and a pore-forming material to prepare a mixture;
pulverizing the mixture; and
sintering the pulverized mixture to prepare an anode active material comprising a carbonized polymer material,wherein the metal particle powder comprises a metal selected from the group consisting of Si, Sn, Al, Ge, Pb, Bi, Sb, alloys thereof, and combinations thereof as a main component.
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Abstract
An anode active material comprises metal core particles, metal nano wires formed on the metal core particles, pores between the metal core particles and the metal nano wires, and a carbon-based coating layer formed on a surface of the metal core particles and metal nano wires. In the anode active material according to the present invention, the metal core particles and metal nano wires are combined to form a single body, and a carbon-based coating layer is formed on the surface of the metal nano wires and metal core particles. Thus, volume changes in the pulverized metal core particles can be effectively buffered during charging and discharging, and the metal core particles are electrically connected through the metal nano wires. As a result, volume changes in the anode active material and degradation of the electrode can be prevented, thereby providing excellent initial charge/discharge efficiency and enhanced charge/discharge capacity.
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Citations
10 Claims
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1. A method of preparing an anode active material for a lithium battery, the method comprising:
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mixing a metal particle powder, a polymer material and a pore-forming material to prepare a mixture; pulverizing the mixture; and sintering the pulverized mixture to prepare an anode active material comprising a carbonized polymer material, wherein the metal particle powder comprises a metal selected from the group consisting of Si, Sn, Al, Ge, Pb, Bi, Sb, alloys thereof, and combinations thereof as a main component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification