多硫化物
硫黄
阴极
氮化硼
材料科学
碳纳米管
化学工程
锂(药物)
碳纤维
吸附
硼
氮化物
储能
纳米技术
化学
复合材料
电极
电解质
冶金
有机化学
复合数
图层(电子)
功率(物理)
物理化学
内分泌学
工程类
医学
量子力学
物理
作者
Mengyuan Li,Kun Fu,Zhixuan Wang,Chaochao Cao,Jingwen Yang,Qinghong Zhai,Zheng Zhou,Jiawei Ji,Yanming Xue,Chengchun Tang
标识
DOI:10.1002/chem.202003807
摘要
Abstract Lithium‐sulfur (Li‐S) batteries are one of the most promising high‐energy‐density storage systems. However, serious capacity attenuation and poor cycling stability induced by the shuttle effect of polysulfide intermediates can impede the practical application of Li‐S batteries. Herein we report a novel sulfur cathode by intertwining multi‐walled carbon nanotubes (CNTs) and porous boron nitride fibers (BNFs) for the subsequent loading of sulfur. This structural design enables trapping of active sulfur and serves to localize the soluble polysulfide within the cathode region, leading to low active material loss. Compared with CNTs/S, CNTs/BNFs/S cathodes deliver a high initial capacity of 1222 mAh g −1 at 0.1 C. Upon increasing the current density to 4 C, the cell retained a capacity of 482 mAh g −1 after 500 cycles with a capacity decay of only 0.044 % per cycle. The design of CNTs/BNFs/S gives new insight on how to optimize cathodes for Li‐S batteries.
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