3D Ti3C2Tx aerogel-modified separators for high-performance Li-S batteries
3D Ti3C2Tx aerogel-modified separators for high-performance Li-S batteries
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用于高性能锂硫电池的 3D Ti3C2TX 气凝胶改性隔膜
DOI：
10.1016/j.jallcom.2019.153155
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发表时间：
2020
影响因子：
6.2
通讯作者：
Zhang Xitian
中科院分区：
文献类型：
--
作者：
Meng Qinghe;Jin Qi;Wang Xinyu;Lv Wenbo;Ma Xinzhi;Li Lu;Wu Lili;Gao Hong;Zhu Chuncheng;Zhang Xitian
锂硫（Li-S）电池作为下一代能量存储系统最有前途的候选者之一已经引起越来越多的关注。然而，可溶性中间体多硫化锂的穿梭效应导致活性材料的损失和缓慢的氧化还原动力学，阻碍了Li-S电池的循环能力和倍率性能。在这里，我们应用用3D Ti 3C 2 Tx气凝胶改性的商业聚丙烯隔板来解决Li-S电池中的问题。这种特殊结构的Ti 3C 2 Tx气凝胶不仅有效地避免了2D Ti 3C 2 Tx材料的重新堆叠现象，以暴露更多的活性表面和锚多硫化锂，而且由于Ti 3C 2 Tx表面的高导电性，增加了高阶多硫化锂到低阶多硫化锂的反应动力学。由于高比表面积和3D结构，具有3D Ti 3C 2 Tx气凝胶功能化隔膜的Li-S电池表现出上级的性能，包括在0.1C下1487 mAh g-1的高放电容量，长循环稳定性，以及在1C下1500次循环中每次循环0.037%的低衰减率。
Lithium-sulfur (Li–S) batteries have attracted increasing attention as one of the most promising candidates for next-generation energy storage systems. However, the shuttle effect of soluble intermediates, lithium polysulfides, results in a loss of active materials and sluggish redox kinetics, hampering the cyclability and rate capability of Li–S batteries. Here, we apply the commercial polypropylene separators modified with a 3D Ti3C2Txaerogel to resolve the issues in Li–S batteries. This special structure of the Ti3C2Txaerogel not only effectively avoids the restacking phenomenon of 2D Ti3C2Txmaterials to expose more active surface and anchor lithium polysulfides but also increases the reaction kinetics of high-order lithium polysulfides to low-order lithium polysulfides, due to the high conductivity of Ti3C2Txsurfaces. Due to the high specific surface area and the 3D structure, the Li–S batteries with 3D Ti3C2Txaerogel-functionalized separators exhibit superior performances, including a high discharge capacity of 1487 mAh g−1at 0.1 C, a long cycling stability, and a low decay rate of 0.037% per cycle at 1 C for 1500 cycles.