多硫化物
异质结
材料科学
阴极
硫黄
电化学
纳米颗粒
氧化物
纳米技术
锂(药物)
化学工程
光电子学
电极
化学
电解质
冶金
物理化学
工程类
医学
内分泌学
作者
Meixiu Song,Yanan Liu,Jingzhe Hong,Xiaoshuang Wang,Xiaoxiao Huang
标识
DOI:10.26599/jac.2023.9220794
摘要
Heterostructure engineering for sulfur hosts is an effective way to achieve interfacial synergistic effects on suppressing the "shuttle effect" of polysulfides and thus improve the electrochemical performance of lithium-sulfur (Li-S) batteries.Rational selection and design of different components into heterostructures is vital to enhance the synergistic effect.Herein, J u s t A c c e p t e dMoS2/MoP Mott-Schottky heterostructures nanoparticles decorated on reduced graphene oxide (MoS2/MoP@rGO) are fabricated, and used as sulfur host firstly.Theoretical calculation and experiment results reveal that in-situ introduction of MoP could tune the electronic structure and activate the basal plane of MoS2, and achieve the interfacial synergistic effects between adsorption (MoS2) and fast conversion (MoP).Such synergistic effects enable MoS2/MoP@rGO to not only remarkably facilitate the Li2S deposition during discharging process but also significantly accelerate the Li2S dissolution during charging process, demonstrating bidirectional promotion behaviors.Thus, the designed cathode delivers an initial capacity of 919.5 mAh g -1 with a capacity of 502.3 mAh g -1 remaining after 700 cycles at 0.5 C.Even under a higher sulfur loading of 4.31 mg cm -2 and a lower E/S of 8.21 μL mg -1 , the MoS2/MoP@rGO@S cathode could still achieve good capacity and cycle stability.This work provides a novel and efficient structural design strategy of sulfur hosts for highperformance Li-S energy storage systems.
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