聚丙烯腈
材料科学
阴极
催化作用
导电体
电极
电导率
化学工程
电化学
复合材料
聚合物
有机化学
化学
工程类
物理化学
作者
Tao Sun,Shuo Wang,Mengyao Xu,Ning Qiao,Qizhen Zhu,Bin Xu
标识
DOI:10.1021/acsami.3c17874
摘要
Sulfurized polyacrylonitrile (PAN@S) is a promising cathode material for room-temperature Na/S batteries but suffers from low conductivity and insufficient electrochemical activity, resulting in unsatisfactory actual capacity and rate performance. Herein, Ti3C2Tx MXene nanosheets are used as a conductive and catalytic binder to establish the PAN@S electrode, wherein MXene constructs a highly conductive framework for fast charge transport and provides high catalytic effect to improve the active material utilization and accelerate the redox kinetics significantly. Therefore, the PAN@S electrode bonded by MXene shows an electronic conductivity of 5.05 S cm–1, 4 orders of magnitude higher than the conventional electrodes bonded by the insulative polymer binders, and much decreased activation energy barrier and resistance. Consequently, the PAN@S electrode displays superior performance in terms of high capacity (697.3 mAh g–1 at 200 mA g–1), unparalleled rate capability (189.0 mAh g–1 at 20 A g–1), and excellent high-rate cycling performance (a capacity decay rate of ∼0.04% per cycle during 1000 cycles at 5 A g–1). This work provides a high-performance electrode for room-temperature Na/S batteries and shows the promising potential of conductive and catalytic MXene binders in boosting the performance of active materials.
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