Lithiated VO2(M)@Carbon Fibers Hybrid Host for Improving the Cycling Stability of Sulfur Cathode in Lithium‐Sulfur Batteries†,Chinese Journal of Chemistry

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Lithiated VO2(M)@Carbon Fibers Hybrid Host for Improving the Cycling Stability of Sulfur Cathode in Lithium‐Sulfur Batteries†
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-08-14 , DOI: 10.1002/cjoc.202000321
Yuxin Wang ₁ , Ling Zhang ₁ , Jiaying Bi ₁ , Hao Yang ₁ , Zhikun Zhao ₁ , Daobin Mu ₁ , Borong Wu _{1,

2}

Affiliation

We successfully prepared the Li‐VO₂(M) nanosheets via a facile lithiation method. After compositing with conductive carbon fibers, the sulfur host (Li‐VO₂(M)@CFs) combines the efficient adsorption ability of the VO₂(M) with superior electronic conductivity of the carbon fibers. Besides, carbon fiber cloth used as the current collector can provide the 3D electronic channels. Therefore, the coin cells exhibited the superior reversible capacity of 1250 mA h g^–1 at 0.2 C and a low capacity decay value of 0.068% per cycle within 416 cycles at 1 C, indicative of the favorable cycling stability. Moreover, even at a high rate of 5 C, it also kept at a high discharge capacity of 401 mA h g^–1. In conclusion, this work discloses an attractive route to reduce the dissolution loss of lithium polysulfides (LiPSs) and enhance the overall performance of Li‐S batteries.

中文翻译：

锂化VO2（M）@碳纤维混合基质，可改善锂硫电池中硫阴极的循环稳定性†

我们通过简便的锂化方法成功制备了Li-VO ₂（M）纳米片。与导电性碳纤维合成后，将硫主机（栗-VO ₂（M）@CFs）结合了VO的有效吸附能力₂与所述碳纤维的优异的电子传导性（M）。此外，用作集电器的碳纤维布可以提供3D电子通道。因此，纽扣电池在0.2 C时表现出1250 mA hg ^–1的优异可逆容量，在1 C的416次循环中，每循环的容量衰减率很低，为0.068％，表明循环稳定性良好。而且，即使在5 C的高速率下，它也保持了401 mA hg ^–1的高放电容量。。总之，这项工作揭示了一种有吸引力的途径，可以减少多硫化锂（LiPS）的溶解损失并提高Li-S电池的整体性能。

更新日期：2020-08-14

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