Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 4, Pages 1395-1399Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00022
Keywords
liquid metal; self-healing; liquid buffer; silicon; lithium-ion battery
Funding
- University of Wisconsin System
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Si is among the highest theoretical capacity anodes for lithium-ion batteries, but it suffers from huge volume expansion during lithiation. Here we report a new approach to alleviating the volume change-induced degradation of Si anodes by mixing Si with a room-temperature liquid metal (LM), namely, Ga-Sn alloy. The Ga-Sn alloy is fluid with self-healing ability, acting as the liquid buffer for the Si upon lithiation and delithiation and healing the cracks caused by the volume expansion and contraction. The resulting Si/LM composite exhibits a high capacity and excellent cyclicability. The composite anode delivers a reversible capacity of similar to 670 mAh/g after 1000 cycles, with an outstanding rate capability.
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