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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2014.11
- 수록면
- 1,060 - 1,064 (5page)
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초록· 키워드
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Rechargeable lithium-ion batteries are widely used as electric power source for portable electronics and electric vehicle (EV) due to its excellent characteristics such as high voltage, and high energy density.
Silicon is a promising anode material for high performance lithium ion batteries, as it has very high theoretical reversible specific capacity (3579 mAh/g for Li15Si4) at room temperature. However, the implementations of siliconbased materials have some challenges. Active particle pulverization caused by the large volume expansion leads to the loss of electrical contacts within the electrode. It is recognized as one of the major capacity fade with repeated charges?discharge cycling. Therefore, it is necessary to understand volumetric changes, stress evolution and fracture behavior of silicon anodes for development of high performance Lithium ion batteries.
Recent experimental results reveal that the first lithiation of crystalline Si is a two-phase reaction mechanism, in which the crystalline Si is consumed to form highly lithiated amorphous LixSi. The kinetics of two phase lithiation has been found that it is limited by the reaction at the phase boundary to break Si?Si bonds in crystalline structure. This two phase reaction mechanism can induce large mechanical stress at the phase boundary and eventually lead to the fracture of silicon.
Therefore, we provide an intercalation-induced stress model for crystalline silicon to understand the degradation mechanisms in silicon anode materials.
Silicon is a promising anode material for high performance lithium ion batteries, as it has very high theoretical reversible specific capacity (3579 mAh/g for Li15Si4) at room temperature. However, the implementations of siliconbased materials have some challenges. Active particle pulverization caused by the large volume expansion leads to the loss of electrical contacts within the electrode. It is recognized as one of the major capacity fade with repeated charges?discharge cycling. Therefore, it is necessary to understand volumetric changes, stress evolution and fracture behavior of silicon anodes for development of high performance Lithium ion batteries.
Recent experimental results reveal that the first lithiation of crystalline Si is a two-phase reaction mechanism, in which the crystalline Si is consumed to form highly lithiated amorphous LixSi. The kinetics of two phase lithiation has been found that it is limited by the reaction at the phase boundary to break Si?Si bonds in crystalline structure. This two phase reaction mechanism can induce large mechanical stress at the phase boundary and eventually lead to the fracture of silicon.
Therefore, we provide an intercalation-induced stress model for crystalline silicon to understand the degradation mechanisms in silicon anode materials.
목차
Abstract
1. 서론
2. 리튬 흡수에 따른 응력해석 방법
3. 응력해석 결과
4. 결론
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