F-doped orthorhombic Nb_(2)O_(5) exposed with 97% (100) facet for fast reversible Liþ-Intercalation  

作　　者：Xiaodi Liu Yufeng Tang Dan Zhang Guangyin Liu Xinwei Luo Yi Shang Xiu Li Jianmin Ma 

机构地区：[1]College of Chemistry and Pharmaceutical Engineering,Nanyang Normal University,Nanyang,473061,China [2]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu,611731,China

出　　处：《Green Energy & Environment》2024年第4期723-731,共9页绿色能源与环境（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51802163);the Natural Science Foundation of Henan Province of China(No.222300420252);the Natural Science Foundation of Henan Department of Education(No.20A480004).

摘　　要：Orthorhombic Nb_(2)O_(5)(T-Nb_(2)O_(5))is attractive for fast-charging Li-ion batteries,but it is still hard to realize rapid charge transfer kinetics for Li-ion storage.Herein,F-doped T-Nb_(2)O_(5) microflowers(F-Nb_(2)O_(5))are rationally synthesized through topotactic conversion.Specifically,F-Nb_(2)O_(5) are assembled by single-crystal nanoflakes with nearly 97%exposed(100)facet,which maximizes the exposure of the feasible Li^(+)transport pathways along loosely packed 4g atomic layers to the electrolytes,thus effectively enhancing the Li^(+)-intercalation performance.Besides,the band gap of F-Nb_(2)O_(5) is reduced to 2.87 eV due to the doping of F atoms,leading to enhanced electrical conductivity.The synergetic effects between tailored exposed crystal facets,F-doping,and ultrathin building blocks,speed up the Li^(+)/electron transfer kinetics and improve the pseudocapacitive properties of F-Nb_(2)O_(5).Therefore,F-Nb_(2)O_(5) exhibit superior rate capability(210.8 and 164.9 mAh g^(-1) at 1 and 10 C,respectively)and good long-term 10 C cycling performance(132.7 mAh g^(-1) after 1500 cycles).

关 键 词：Exposed facets Orthorhombic Nb_(2)O_(5) F-doping Pseudocapacitive intercalation anode Li-ion storage 

分 类 号：TM21[一般工业技术—材料科学与工程]