Microstructure Controlled Porous Silicon Particles as a High Capacity Lithium Storage Material via Dual Step Pore Engineering |
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Authors: | Myungbeom Sohn Dong Geun Lee Hyeong‐Il Park Cheolho Park Jeong‐Hee Choi Hansu Kim |
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Institution: | 1. Department of Energy Engineering, Hanyang University, Seoul, Republic of Korea;2. Next‐G Institute of Technology, Iljin Electric Co. Ltd., Ansan, Republic of Korea;3. Korea Electrotechnology Research Institute, Changwon, Republic of Korea |
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Abstract: | To overcome the lithium storage barriers of current lithium‐ion batteries, it is imperative that conventional low capacity graphite anodes be replaced with other higher capacity anode materials. Silicon is a promising alternative anode material due to its huge energy densities; however, its lithium‐concentration‐dependent volumetric changes can induce severely adverse effects that lead to drastic degradations in capacity during cycling. The dealloying of Si–metal alloys is recently suggested as a scalable approach to fabricate high‐performance porous Si anode materials. Herein, a microstructure controlled porous Si is developed by the dealloying in conjunction with wet alkaline chemical etching. The resulting 3D networked structure enables enhancement in lithium storage properties when the Si‐based material is applied not only as a single active material but also in a graphite‐blended electrode. |
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Keywords: | anodes chemical etching Li‐ion batteries porous materials silicon |
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