Direct trapping and rapid conversing of polysulfides via a multifunctional Nb2O5-CNT catalytic layer for high performance lithium-sulfur batteries
Direct trapping and rapid conversing of polysulfides via a multifunctional Nb2O5-CNT catalytic layer for high performance lithium-sulfur batteries
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DOI：
10.1016/j.carbon.2020.10.022
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发表时间：
2021-02-01
期刊：
影响因子：
10.9
通讯作者：
Long, Donghui
中科院分区：
文献类型：
--
作者：
Liu, Yajing;Chen, Mingqi;Long, Donghui
高能量密度锂硫电池的实用化受到多硫化物有害的穿梭效应和缓慢的氧化还原动力学的严重阻碍。在此，多功能Nb 2 O 5-碳纳米管（CNT）催化界面的设计和制造上的隔膜，它可以直接捕获多硫化物，然后快速催化它们的氧化还原转化为先进的锂硫电池。Nb_2O_5-CNT界面具有良好的导电性和催化性，可提供长距离的电子传递网络、强的化学吸附性能和丰富的催化活性位，从而加速多硫化物的转化动力学和调节Li_2S的成核/溶解。添加Nb 2 O 5-CNT界面的硫阴极首次放电容量为1286 mAh g（-1），容量保持率为77.0%，在0.2C下循环100次，容量衰减率为0.23%.同时，由于Nb 2 O 5-CNT界面对穿梭效应的抑制作用，可有效抑制自放电，减少锂枝晶的形成。该工作为通过设计用于Li-S化学的多功能催化界面来抑制穿梭效应和加速氧化还原转化提供了有益的见解。(C)2020爱思唯尔有限公司版权所有。
Practical application of high-energy-density lithium-sulfur (Li-S) battery is greatly impeded by the detrimental shuttling effect and sluggish redox kinetics of polysulfides. Herein, a multifunctional Nb2O5-carbon nanotube (CNT) catalytic interface is designed and fabricated onto the separator, which can directly trap the polysulfides and then rapidly catalyze their redox conversion for advanced Li-S batteries. The construction of conductive and catalytic Nb2O5-CNT interface could afford long-distance electron transfer network, strong chemisorptive properties, and rich catalytic sites for accelerating polysulfide conversion kinetics and regulating Li2S nucleation/dissolution. The sulfur cathode with the assistant of Nb2O5-CNT interface could deliver an initial discharge capacity of 1286 mAh g(-1) and remain 992 mAh g(-1) with a capacity retention of 77.0%, corresponding to a low capacity attenuation rate of 0.23% per cycle during 100 cycles at 0.2C. Meanwhile, the Nb2O5-CNT interface can greatly suppress the self discharge and effectively reduce the formation of lithium dendrite due to the inhibition of the shuttling effect. This work provides instructive insights to suppress the shuttle effect and accelerate redox conversion via designing a multifunctional catalytic interface for Li-S chemistry. (C) 2020 Elsevier Ltd. All rights reserved.