Abstract
The sluggish redox reaction kinetics of lithium polysulfides(LiPSs)are considered the main obstacle to the commercial application of lithium-sulfur(Li-S)batteries.To accelerate the conversion by catalysis and inhibit the shuttling of soluble LiPSs in Li-S batteries,a solution is proposed in this study.The solution involves fabrication of N,S co-doped carbon coated In2O3/In2S3 heterostructure(In2O3-In2S3@NSC)as a multifunctional host material for the cathode.The In2O3-In2S3@NSC composite can reduce the Gibbs free energy for the conversion reactions of LiPSs,which results in superior performance.The synergy between different components in In2O3-In2S3@NSC and the unique 3D structure facilitate ion and electron transport in Li-S batteries.The In2O3-In2S3@NSC/Li2S6 cathode exhibits excellent rate capacity,with a capacity of 599 mAh g-1 at 5.5 C,and good cycle stability,with a capacity of 436 mAh g-1 after 1000 cycles at 1 C.Overall,this study proposes a promising solution to improve the energy storage properties of Li-S batteries,which could potentially facilitate the commercialization of Li-S batteries.
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