High-performance three-dimensional flower-like CoS/MWCNT composite host for Li–S batteries
High-performance three-dimensional flower-like CoS/MWCNT composite host for Li–S batteries
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DOI：
10.1007/s10008-021-05066-x
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发表时间：
2021-10
影响因子：
2.5
通讯作者：
Bingyin Zhang;Sheng Zhao;Zhihao Tang;Pengfei Xie;Angulakshmi Natarajan;Yingke Zhou;Xiaohui Tian
中科院分区：
文献类型：
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作者：
Bingyin Zhang;Sheng Zhao;Zhihao Tang;Pengfei Xie;Angulakshmi Natarajan;Yingke Zhou;Xiaohui Tian
尽管锂硫电池有望替代传统锂离子电池，但由于多硫化物溶解、体积变化和电导率低等问题，其商业应用受到限制。为了克服这些问题，我们设计并水热合成了一种花状三维CoS/多壁碳纳米管（MWCNT）复合材料作为硫主体材料。 CoS和MWCNT通过化学键紧密连接，形成稳定的复合结构。极性和催化性的CoS可以促进氧化还原过程并减少多硫化物的溶解，而柔性碳纳米管可以缓冲充电和放电过程中电极的膨胀/收缩。 CoS/MWCNT-S 显示出优异的比容量（1120 mAh g−1，0.1 C）和 200 次循环后的高容量保持率（78%，0.5 C）。图形摘要
Although lithium–sulfur batteries are promising replacements for conventional lithium-ion batteries, their commercial applications have been limited due to issues such as polysulfide dissolution, volume variation, and low conductivity. To overcome these problems, we designed and hydrothermally synthesized a flower-like three-dimensional CoS/multiwall carbon nanotube (MWCNT) composite as the sulfur host material. The CoS and MWCNTs were tightly joined by chemical bonds to form a stable composite structure. The polar and catalytic CoS can promote the redox process and reduce the dissolution of polysulfides, while the flexible carbon nanotubes can buffer the expansion/shrinkage of the electrode during charging and discharging. CoS/MWCNT-S displays an excellent specific capacity (1120 mAh g−1, 0.1 C) and high capacity retention after 200 cycles (78%, 0.5 C).Graphic abstract