Expediting redox kinetics of sulfur species by atomic‐scale electrocatalysts in lithium–sulfur batteries

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Jia‐Qi Huang¹  Hong Yuan¹  Long Kong¹  Bo‐Quan Li¹  Qiang Zhang²  Xiao Chen²  Jin‐Xiu Chen²  Hong‐Jie Peng²  Qi Jin²  Chang‐Xin Zhao²  Jin‐Lei Qin² 

[1] Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing China;Department of Chemical Engineering, Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Tsinghua University Beijing China;

关键词: atomic‐scale electrocatalysts;    kinetic evolution;    lithium–sulfur batteries;    polysulfide electrocatalysis;    polysulfide intermediates;   

DOI  :  10.1002/inf2.12056

来源: DOAJ

【 摘 要 】

Abstract Lithium–sulfur (Li–S) batteries have extremely high theoretical energy density that make them as promising systems toward vast practical applications. Expediting redox kinetics of sulfur species is a decisive task to break the kinetic limitation of insulating lithium sulfide/disulfide precipitation/dissolution. Herein, we proposed a porphyrin‐derived atomic electrocatalyst to exert atomic‐efficient electrocatalytic effects on polysulfide intermediates. Quantifying electrocatalytic efficiency of liquid/solid conversion through a potentiostatic intermittent titration technique measurement presents a kinetic understanding of specific phase evolutions imparted by the atomic electrocatalyst. Benefiting from atomically dispersed “lithiophilic” and “sulfiphilic” sites on conductive substrates, the finely designed atomic electrocatalyst endows Li–S cells with remarkable cycling stablity (cyclic decay rate of 0.10% in 300 cycles), excellent rate capability (1035 mAh g−1 at 2 C), and impressive areal capacity (10.9 mAh cm−2 at a sulfur loading of 11.3 mg cm−2). The present work expands atomic electrocatalysts to the Li–S chemistry, deepens kinetic understanding of sulfur species evolution, and encourages application of emerging electrocatalysis in other multielectron/multiphase reaction energy systems.

【 授权许可】

Unknown