Antibonding orbital tailor and stress relief engineering for FeS_(2)complex toward superior sodium storage  

作　　者：You-Bin Zhang Zhen-Guo Qi Fu-Sheng Liu Guo-Hui Qin 

机构地区：[1]State Key Laboratory Base for Eco-Chemical Engineering,College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]Shandong Synergetic Innovation Center of Ecological and Chemical Engineering,Qingdao 266042,China

出　　处：《Rare Metals》2024年第10期5048-5059,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22175103 and 22178191);Shandong Natural Science Foundation of young Taishan scholar(No.tsqn202306217)。

摘　　要：The sluggish kinetics behaviors and vast volume variations of Na^(+)hosts to FeS_(2)anode involved intercalation,and conversion reactions plague its applicability of sodium-ion batteries(SIBs).Here,a significantly expedited kinetics via cation intercalation and considerably relieved stress accumulation by constructing the concave scaffold protector are approached for FeS_(2)complex.Upon Mn^(2+)intercalation into FeS_(2),a new stable Mn-FeS_(2)was generated with distorted coordination;elevated antibonding orbital occupancy and lowed d band center to the release of more free Na^(+)were achieved,which was further encapsulated by hollow bowl-like carbon spheres(BC)This cation intercalation and concave morphology strategies confer Mn-FeS_(2)@BC significantly enhanced electron ion transport kinetics via reversed electron transfer to FeS_(2)fast desolvation kinetics,and evidently depressed structural deformation during Na^(+)insertion and extraction.Consequently,Mn-FeS_(2)@BC delivers the longevity and stable Na^(+)storage capacity in both half and full cell device.Moreover,Mn-FeS_(2)@BC also displays excellen adaptability in a wider temperature range.This work proposes new views into the deep regulation of electrochemical performance of transition metal anodes via intercalation chemistry and concave engineering.

关 键 词：FeS_(2) Intercalation chemistry Concave engineering Sodium capture 

分 类 号：O641.4[理学—物理化学] TM912[理学—化学]