多硫化物
氧化还原
硫黄
电化学
阴极
电催化剂
介孔材料
钴
催化作用
材料科学
电极
化学工程
化学
无机化学
电解质
有机化学
物理化学
工程类
作者
Xingyuan Zhang,Honghui Gu,Chao Shen,Bingqing Wei,Jian‐Gan Wang
标识
DOI:10.1002/celc.202101557
摘要
Abstract Achieving effective adsorption and fast conversion of soluble polysulfides confined in the sulfur cathode is critical yet challenging for building high‐performance lithium‐sulfur batteries. Herein, we construct a unique hollow‐structured Co 0.85 Se/C as a separator modifier (CSPP) to effectively suppress the polysulfide shuttle effect. The Co 0.85 Se/C demonstrates strong anchoring with polysulfide species and smooth bidirectional electrocatalysis. The unique mesoporous hollow architecture affords sufficient catalytic sites and Li + diffusion channels for promoting the reaction kinetics. Benefiting from the merits, the CSPP‐cell could yield a superior electrochemical utilization of active sulfur, excellent rate capability (679 mAh g −1 at 5 C), and stable cycling performance with an ultralow fading rate of 0.056 % per cycle over 500 cycles. The work highlights great promise of developing cobalt‐based materials as kinetic regulators for highly stable lithium‐sulfur batteries.
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