Control of Interfacial Layers for High-Performance Porous Si Lithium-Ion Battery Anode
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- 作者：Hyungmin Park ; Sungjun Lee ; Seungmin Yoo ; Myoungsoo Shin ; Jieun Kim ; Myungjin Chun ; Nam-Soon Choi ; Soojin Park
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：September 24, 2014
- 年：2014
- 卷：6
- 期：18
- 页码：16360-16367
- 全文大小：510K
- ISSN：1944-8252
文摘
We demonstrate a facile synthesis of micrometer-sized porous Si particles via copper-assisted chemical etching process. Subsequently, metal and/or metal silicide layers are introduced on the surface of porous Si particles using a simple chemical reduction process. Macroporous Si and metal/metal silicide-coated Si electrodes exhibit a high initial Coulombic efficiency of 鈭?0%. Reversible capacity of carbon-coated porous Si gradually decays after 80 cycles, while metal/metal silicide-coated porous Si electrodes show significantly improved cycling performance even after 100 cycles with a reversible capacity of >1500 mAh g鈥?. We confirm that a stable solid-electrolyte interface layer is formed on metal/metal silicide-coated porous Si electrodes during cycling, leading to a highly stable cycling performance.