阳极
材料科学
纳米孔
锂(药物)
电化学
离子
兴奋剂
介电谱
热扩散率
离子液体
化学工程
电导率
扩散
纳米技术
光电子学
物理化学
电极
物理
化学
热力学
有机化学
内分泌学
工程类
催化作用
医学
作者
Runming Tao,Tianyu Zhang,Xiao‐Guang Sun,Chi‐Linh Do‐Thanh,Sheng Dai
标识
DOI:10.1002/batt.202300101
摘要
Abstract Although TiNb 2 O 7 is regarded as a fast‐rechargeable lithium‐ion battery (LIB) anode material, the intrinsic poor electrochemical kinetics of TiNb 2 O 7 still dramatically impedes its development. Herein, an ionothermal synthesis‐assisted doping strategy is proposed for the preparation of a new W 6+ ‐doped TiNb 2 O 7 material (Ti 0.95 W 0.05 Nb 2 O 7 ) with nanoporous structure (denoted as NPTWNO). The improved Li + diffusion coefficient of NPTWNO suggests that the ionic‐liquid‐templated nanoporous architecture improves the Li + diffusion kinetics. The density functional theory computational study reveals that the doped W 6+ successfully boosts the electronic conductivity due to the narrowed conduction‐valance bandgap resulted from charge redistribution, which is reflected by the electrochemical impedance spectroscopy data. With the simultaneously enhanced Li + diffusivity and electronic conductivity, NPTWNO achieves fast‐rechargeability in LIBs. Therefore, this work indicates the potential of ionothermal synthesis‐assisted doping strategy on energy storage materials and offers NPTWNO material with promising electrochemical performance.
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