Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 13, Issue 10, Pages 1379-1385Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201800326
Keywords
anode materials; batteries; doping; electrochemistry; titanium
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Funding
- Programs of National Nano-Key [2017YFA0206702, 2016YFB0901502]
- National Natural Science Foundation of China (NSFC) [21421001]
- Ministry of Education (MOE) 111 [B12015]
- Tianjin [16PTSYJC00030]
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Lithium-sulfur (Li-S) batteries have shown great potential as high energy-storage devices. However, the stability of the Li metal anode is still a major concern. This is due to the formation of lithium dendrites and severe side reactions with polysulfide intermediates. We herein develop an anode protection method by coating a Nafion/TiO2 composite layer on the Li anode to solve these problems. In this architecture, Nafion suppresses the growth of Li dendrites, protects the Li anode, and prevents side reactions between polysulfides and the Li anode. Moreover, doped TiO2 further improves the ionic conductivity and mechanical properties of the Nafion membrane. Li-S batteries with a Nafion/TiO2-coated Li anode exhibit better cycling stability (776mAhg(-1) after 100cycles at 0.2C, 1C=1672mAg(-1)) and higher rate performance (787mAhg(-1) at 2C) than those with a pristine Li anode. This work provides an alternative way to construct stable Li anodes for high-performance Li-S batteries.
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