Multisize CoS<sub>2</sub> Particles Intercalated/Coated‐Montmorillonite as Efficient Sulfur Host for High‐Performance Lithium‐Sulfur Batteries
Lian Wu, Yue Yu, Yongqiang Dai, Yifang Zhao, Wei Xue, Bing Liao, Hao Pang
Abstract
Abstract The chemisorption and catalysis of lithium polysulfides (LiPSs) are effective strategies to suppress the shuttle effect in lithium‐sulfur (Li−S) batteries. Herein, multisize CoS 2 particles intercalated/coated‐montmorillonite (MMT) as an efficient sulfur host is synthesized. As expected, the obtained S/CoS 2 @MMT cathode achieves an absorption‐catalysis synergistic effect through the polar MMT aluminosilicate sheets and the well‐dispersed nano‐micron CoS 2 particles. Furthermore, efficient interlamellar ion pathways and interconnected conductive network are constructed within the composite host due to the intercalation/coating of CoS 2 in/on MMT. Therefore, the S/CoS 2 @MMT cathode achieves an outstanding rate performance up to 5C (∼548 mAh g −1 ) and a high cycling stability with low capacity decay of 0.063 and 0.067 % per cycle for 500 cycles at 1C and 2C, respectively. With a higher sulfur loading of 4.0 mg cm −2 , the cathode still delivers satisfactory rate and cycling performance. It shows that the CoS 2 @MMT host has great application prospects in Li−S batteries.