In situ synthesis of SnPS_(3)/Ti_(3)C_(2)T_(x) hybrid anode via molten salt etching method for superior sodium-ion batteries  

作　　者：Longsheng Zhong Ming Yue Wenhu Xie Hongxiao He Yanhe Xiao Baochang Cheng Liangxu Lin Shuijin Lei 

机构地区：[1]School of Physics and Materials Science,Nanchang University,Nanchang 330031,Jiangxi,China [2]Strait Institute of Flexible Electronics(SIFE,Future Technologies),Fujian Normal University,Fuzhou 350017,Fujian,China

出　　处：《Journal of Energy Chemistry》2024年第11期623-633,共11页能源化学（英文版）

基　　金：financially National Natural Science Foundation of China (Grant Number: 22265018);Key Project of Natural Science Foundation of Jiangxi Province (Grant Number: 20232ACB204010)。

摘　　要：Recently,SnPS_(3) has gained attention as an impressive sodium-ion battery anode material because of its significant theoretical specific capacity derived from the conversion-alloying reaction mechanism.Nevertheless,its practical applicability is restricted by insufficient rate ability,and severe capacity loss due to inadequate electrical conductivity and dramatic volume expansion.Inspired by the electrochemical enhancement effect of MXene substrates and the innovative Lewis acidic etching for MXene preparation,SnPS_(3)/Ti_(3)C_(2)T_(x) MXene(T=-Cl and-O) is constructed by synchronously phospho-sulfurizing Sn/Ti_(3)C_(2)T_(x) precursor.Benefiting from the boosted Na^(+) diffusion and electron transfer rates,as well as the mitigated stress expansion,the synthesized SnPS_(3/)Ti_(3)C_(2)T_(x) composite demonstrates enhanced rate capability(647 mA h g^(-1) at 10 A g^(-1)) alongside satisfactory long-term cycling stability(capacity retention of 94.6% after 2000 cycles at 5 A g^(-1)).Importantly,the assembled sodium-ion full cell delivers an impressive capacity retention of 97.7% after undergoing 1500 cycles at 2 A g^(-1).Moreover,the sodium storage mechanism of the SnPS_(3/)Ti_(3)C_(2)T_(x) electrode is elucidated through in-situ and ex-situ characterizations.This work proposes a novel approach to ameliorate the energy storage performance of thiophosphites by facile in-situ construction of composites with MXene.

关 键 词：Thiophosphites SnPS_(3) Ti_(3)C_(2)T_(x)MXene Lewis acidic etching Sodium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]