锂(药物)
材料科学
纳米颗粒
纳米技术
硫黄
胶体金
电场
电化学
化学工程
无机化学
电极
化学
冶金
内分泌学
物理化学
工程类
物理
医学
量子力学
作者
Rong Zou,Jie Zhang,Yawen Zheng,Jinling Li,Wenwu Liu,Fen Ran
出处
期刊:Small
[Wiley]
日期:2024-02-28
标识
DOI:10.1002/smll.202312102
摘要
Abstract Although lithium‐sulfur batteries (LSBs) are considered as the promising next rechargeable storage system ascribing to their decent specific capacity of inorganic sulfur, the development is partially impeded by inferior electronic conductivity, severe shuttle effect, and large volume variation. To tackle the issues above, a great deal of effort is made on sulfur‐containing polymer (SCP) that shows better electrochemical performance. Nevertheless, sluggish conversion of lithium polysulfides (LiPSs) obstructs battery performance yet. Herein, electrocatalytic LiPSs with full conversion by tailoring the interfacial electric field are discovered based on gold nanoparticles (AuNPs) anchored on sulfurized polyaniline (SPANI). A downhill path of Gibbs free energy from organosulfur polymer to intermediate product means more spontaneously and favorable for full conversion, as the significant enhancement of electron density of state in the vicinity of the HOMO level for the AuNPs increase the electron transition probability rate. This composite delivers satisfactory electrochemical performance, especially increased rate capacity of >300 mAh g −1 . Furthermore, catalyst mechanism on molecule level is proposed that AuNPsdominate chemical enhancement and higher electron delocalizablility betweenAuNPs and LiPSs molecules. These results can erect a promising strategy for enhancing lithium polysulfides full conversion.
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