首页|F-doped orthorhombic Nb2O5 exposed with 97％(100)facet for fast reversible Li+-Intercalation

F-doped orthorhombic Nb2O5 exposed with 97％(100)facet for fast reversible Li+-Intercalation

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Orthorhombic Nb2O5(T-Nb2O5)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-Nb2O5 microflowers(F-Nb2O5)are rationally synthesized through topotactic conversion.Specifically,F-Nb2O5 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-Nb2O5 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-Nb2O5.Therefore,F-Nb2O5 exhibit superior rate capability(210.8 and 164.9 mAh g-1at 1 and 10 C,respectively)and good long-term 10 C cycling performance(132.7 mAh g-1 after 1500 cycles).

Exposed facetsOrthorhombic Nb2O5F-dopingPseudocapacitive intercalation anodeLi-ion storage

Xiaodi Liu、Yufeng Tang、Dan Zhang、Guangyin Liu、Xinwei Luo、Yi Shang、Xiu Li、Jianmin Ma

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College of Chemistry and Pharmaceutical Engineering,Nanyang Normal University,Nanyang,473061,China

School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu,611731,China

国家自然科学基金Natural Science Foundation of Henan Province of ChinaNatural Science Foundation of Henan Department of Education

5180216322230042025220A480004

2024

10.1016/j.gee.2022.09.009

绿色能源与环境(英文)

绿色能源与环境(英文)

CSTPCD
ISSN：
年,卷(期)：2024.9(4)
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