Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 12, Pages 13904-13913Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b23006
Keywords
lithium-sulfur batteries; Ti3C2/carbon hybrid; catalysis; polysulfide conversion; chemisorption interaction
Funding
- National Science Foundation of China [21574032, 21975058]
- Chinese Academy of Sciences [121D11KYSB20170031]
- Taishan Young Scholar Program
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Despite the fact that lithium-sulfur batteries are regarded as promising next-generation rechargeable battery systems owning to high theoretical specific capacity (1675 mA h g(-1)) and energy density (2600 W h kg(-1)), several issues such as poor electrical conductivity, sluggish redox kinetics, and severe shuttle effect in electrodes still hinder their practical application. MXenes, novel two-dimensional materials with high conductivity, regulable interlayer spacing, and abundant functional groups, are widely applied in energy storage and conversion fields. In this work, a Ti3C2/carbon hybrid with expanded interlayer spacing is synthesized by one-step heat treatment in molten potassium hydroxide. The subsequent experiments indicate that the as-prepared Ti3C2/carbon hybrid can effectively regulate polysulfide redox conversion and has strong chemisorption interaction to polysulfides. Consequently, the Ti3C2/carbon-based sulfur cathode boosts the performance in working lithium-sulfur batteries, in terms of an ultrahigh initial discharge capacity (1668 mA h g(-1) at 0.1 C), an excellent rate performance (520 mA h g(-1) at 5 C), and an outstanding capacity retention of 530 mA h g(-1) after 500 cycles at 1 C with a low capacity fade rate of 0.05% per cycle and stable Coulombic efficiency (nearly 99%). The above results indicate that this composite with high catalytic activity is a potential host material for further high-performance lithium-sulfur batteries.
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