Rational design of adsorption-catalysis functional separator for highly efficient Li-S batteries
Rational design of adsorption-catalysis functional separator for highly efficient Li-S batteries
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高效锂硫电池吸附催化功能隔膜的合理设计
DOI：
10.1016/j.jallcom.2021.163414
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Xitian Zhang
中科院分区：
文献类型：
--
作者：
Weiqi Zhang;Qi Jin;Junpeng Xiao;Jing Yao;Xitian Zhang
锂硫电池的硫利用率低、容量衰减快、倍率性能差等问题严重阻碍了锂硫电池在世界范围内的应用。本文构建了一种有效的功能性V2 CTx/CNT框架，并将其用作隔膜的锚定-催化改性层以改善Li-S电池的性能。CNT由于其令人印象深刻的导电性、连续框架和令人满意的机械稳定性而充当结构的基础，这提供了导电表面并防止结构在循环过程中塌陷。而V2 CTx纳米带的引入，加强了与多硫化锂（LiPS）的化学锚定作用，促进了LiPS在液相中的进一步转化，并诱导Li 2S均匀成核，抑制了穿梭效应，加速了氧化还原反应。得益于锚定催化效应，采用V2 CTx/CNT隔膜的Li-S电池在2 C时可提供893.6 mAh g− 1的出色倍率性能。在1C下1000次循环内，每个循环的平均容量衰减低至0.047%。本工作为锂硫电池的实际应用提供了有益的参考。
The worldwide application of lithium-sulfur (Li–S) batteries is severely hampered by the low utilization of sulfur, rapid capacity fading, and poor rate performance. Herein, an efficient functional V2CTx/CNT framework is constructed and employed as an anchoring-catalysis modified layer of the separator to improve the performance of Li–S batteries. CNT acts as the foundation of the structure due to its impressive conductivity, continuous framework, and satisfactory mechanical stability, which provides a conductive surface and prevents the structure from collapsing during cycling progress as well. While V2CTxnanoribbons, strengthen the chemical anchoring to lithium polysulfides (LiPSs), facilitate the further conversions of the LiPSs in the liquid phase, and induce the Li2S homogeneous nucleation, restraining the shuttle effect and accelerating redox reactions. Benefiting from the anchoring-catalysis effect, the Li–S battery with V2CTx/CNT separator delivers an outstanding rate performance of 893.6 mAh g−1at 2 C. The average capacity decay per cycle within 1000 cycles at 1 C is as low as 0.047%. This work provides a rewarding view to develop the practical application of Li–S batteries with a functional separator.
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