期刊
NANO LETTERS
卷 18, 期 7, 页码 4598-4605出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01882
关键词
Quasi-solid-state Li-S battery; Li/electrolyte interface; in situ XRD; polysulfide diffusion
类别
资金
- National Natural Science Foundation of China [51622208, 21703149]
- Natural Science Foundation of Jiangsu Province [BK20150338]
Lithium metal batteries have attracted increasing attention recently due to their particular advantages in energy density. However, as for their practical application, the development of solid-state lithium metal batteries is restricted because of the poor Li/electrolyte interface, low Li-ion conductivity, and irregular growth of Li dendrites. To address the above issues, we herein report a high Li-ion conductivity and compatible polymeric interfacial layer by grafting tween-20 on active lithium metal. Sequential oxyethylene groups in tween-grafted Li (TG-Li) improve the ion conductivity and the compatibility of the Li/electrolyte interface, which enables low overpotentials and stable performance over 1000 cycles. Consequently, the poly(ethylene oxide)-based solid-state lithium sulfur battery with TG-Li exhibits a high reversible capacity of 1051.2 mA h g(-1) at 0.2 C (1 C = 1675 mA h g(-1)) and excellent stability for 500 cycles at 2 C. The decreasing concentration of the sulfur atom with increasing Ar+ sputtering depth indicates that the polymer interfacial layer works well in suppressing polysulfide reduction to Li2S/Li2S2 on the metallic Li surface even after long-term cycling.
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