Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201800855
Keywords
anodes; chemical etching; Li-ion batteries; porous materials; silicon
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Funding
- Korea Evaluation Institute of Industrial Technology (KEIT) - Ministry of Trade, Industry and Energy, Republic of Korea [10067182]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067182] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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