Enhanced multiple anchoring and catalytic conversion of polysulfides by SnO_(2)-decorated MoS_(2) hollow microspheres for high-performance lithium-sulfur batteries  

作　　者：Yun Tian Zhengyu Wei Fan Li Songjie Li Lixiang Shao Mengyuan He Panfei Sun Yuanyuan Li 

机构地区：[1]School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China [2]Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Journal of Materials Science & Technology》2022年第5期216-223,共8页材料科学技术（英文版）

基　　金：partially supported by grants from Program for Innovative Research Team(in Science and Technology)in University of Henan Province(No.18IRTSTHN001);Project funding for Young Backbone Teachers in Colleges and Universities of Henan Province(No.2020GGJS013)。

摘　　要：Lithium-Sulfur(Li-S)batteries are very competitive in energy storage equipment due to their high theoretical capacity and low cost of raw materials.However,the serious polysulfide"shuttle effect",volume expansion effect and slow conversion reaction kinetics of Li-S batteries during the charge/discharge cycle process still need to be resolved urgently.Herein,we prepared a novel sulfur host of SnO_(2)-decorated MoS_(2) hollow microspheres(SnO_(2)-MoS_(2) HMSs).The unique hollow structure provides enough space to accommodate a large amount of sulfur and effectively adapts to its large volume expansion during charge and discharge process.On the other hand,the SnO_(2) nanoparticles that attached to the surface of the MoS_(2) nanosheets will accelerate the catalysis of MoS_(2) and enhance the bonding strength with the polysulfide intermediates through the S-Sn-O chemical bond,which further inhibits the shuttle effect.The newly synthesized SnO_(2)-MoS_(2) HMSs cathode has achieved excellent electrochemical performance.The initial discharge specific capacity of 1326.4 mAh g^(-1) was obtained at 0.2 C,and after 100 cycles,the specific capacity of the SnO_(2)-MoS_(2) HMSs/S cathode only decreased slightly to 1183.8 mAh g^(-1),its capacity retention rate reaching as high as 89.2%.We expect the newly synthesized hollow structured MoS_(2) with SnO_(2) decoration provides a new strategy for the construction of Li-S battery cathode materials.

关 键 词：Li-S batteries SnO_(2)-decorated hollow MoS_(2)microspheres S-Sn-O chemical bond Electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]