多硫化物
阴极
介孔材料
硫黄
催化作用
锂(药物)
化学工程
材料科学
储能
碳纤维
化学
纳米技术
电极
复合数
有机化学
电解质
复合材料
物理化学
功率(物理)
物理
量子力学
工程类
医学
内分泌学
作者
Lei Wang,Xiaofang Li,Yingxi Zhang,Weijian Mao,Yuanyuan Li,Paul K. Chu,Abdulkadir Kızılaslan,Zijian Zheng,Kaifu Huo
标识
DOI:10.1016/j.cej.2022.137050
摘要
Lithium-sulfur (Li-S) batteries are promising high-energy–density storage devices but severe shuttling of lithium polysulfides (LPSs), low sulfur utilization and sluggish reaction kinetics impede the practical applications. Herein, we report MoP clusters embedded in CMK-3 (cMoP-CMK-3) as a lightweight, conductive, and catalytic cathodic host with large sulfur mass loading for high energy Li-S batteries. The electronically conductive CMK-3 with ordered mesoporous channels could accommodate high loading and expansion of the active sulfur material and facilitate fast ionic/electronic transportation. The strong interaction between cMoP and CMK-3 results in concentrated Li ions inside the channels due to enhanced local electric field, significantly eliminating dead sulfur and improving sulfur utilization to over 90% due to confined catalytic effect. Moreover, the cMoP embedded into channels provide rich adsorptive and catalytic sites to effectively trap LPSs, and catalytically accelerate reaction kinetics. The resulting [email protected] cathode shows a large capacity of 1100 mAh g−1 at 0.5C (1C = 1675 mA g−1) based on the total mass of cathode, high-rate capacity of 767.8 mAh g−1 at 5C, and excellent cycle stability with 0.02% capacity fade per cycle over 500 cycles at 2C. This work demonstrates a confined catalytic strategy to improve the sulfur utilization for high-energy Li-S batteries.
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