Thin film for anode of lithium secondary battery and manufacturing method thereof
First Claim
1. A thin film for an anode of a lithium secondary having a current collector and an anode active material layer formed on the current collector, wherein the anode active material layer is a multi-layered thin film formed by stacking a silver (Ag) layer and a silicon-metal (Si-M) layer having silicon dispersed in a base made from metal reacting with silicon while not reacting with lithium.
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Abstract
A thin film for an anode of a lithium secondary battery having a current collector and an anode active material layer formed thereon is provided. The anode active material layer is a multi-layered thin film formed by stacking a silver (Ag) layer and a silicon-metal (Si-M) layer having silicon dispersed in a base made from metal reacting with silicon while not reacting with lithium. The cycle characteristic of the thin film for an anode can be improved by suppressing the volumetric expansion and shrinkage of Si occurring during charging/discharging cycles. Thus, a lithium secondary battery with improved life characteristics by employing the thin film for an anode, which greatly improves the chemical, mechanical stability of the interface between an electrode and an electrolyte.
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Citations
14 Claims
- 1. A thin film for an anode of a lithium secondary having a current collector and an anode active material layer formed on the current collector, wherein the anode active material layer is a multi-layered thin film formed by stacking a silver (Ag) layer and a silicon-metal (Si-M) layer having silicon dispersed in a base made from metal reacting with silicon while not reacting with lithium.
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11. A method of manufacturing a thin film for an anode of a lithium secondary battery comprising:
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(a) forming a thin film of silicon-metal (Si-M) by depositing a metal reacting with silicon while not reacting with lithium and silicon on a current collector in forms of thin films;
(b) forming a thin film of silver (Ag) by depositing Ag on the Si-M layer in form of a thin film; and
(c) forming a multi-layered thin film by repeating the steps (a) and (b) more than one time. - View Dependent Claims (12, 13, 14)
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Specification