阳极
材料科学
电解质
锂(药物)
化学工程
电池(电)
气相二氧化硅
金属
无机化学
电极
复合材料
化学
冶金
热力学
功率(物理)
物理
物理化学
工程类
医学
内分泌学
作者
Yaqi Liao,Lixia Yuan,Xueting Liu,Jintao Meng,Wang Zhang,Zhen Li,Yangyang Huang
标识
DOI:10.1016/j.ensm.2022.03.035
摘要
Dendritic lithium (Li) growth hinders the applications of Li metal anode. Here, a fumed SiO2 is proposed as an electrolyte additive to realize uniform Li+ deposition. Due to the abundant hydroxyl group on the surface, the SiO2 particles as a pump provide an additional way for Li+ transport, resulting in a homogeneous Li+ flux. Moreover, SiO2 can also smooth the deposited Li and boost the formation of a LiF-rich SEI. As a result, the anode-free Li2S/Cu cell demonstrates a significantly improved rechargeability (1055 mAh g−1, 1st cycle; 523 mAh g−1, 200th cycle). Moreover, even with limited electrolyte (electrolyte/sulfur ratio, 7 µL mg−1) and Li (negative to positive capacity ratio, 3), the Li/S pouch cells can still maintain a high capacity of 689 mAh g−1 after 200 cycles. This work shows a simple and efficient way for constructing high-energy-density Li metal batteries.
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