阳极
材料科学
石墨
锂(药物)
电化学
纳米颗粒
化学工程
纳米技术
离子
电导率
电极
化学
复合材料
物理化学
有机化学
内分泌学
工程类
医学
作者
Wenhao Liu,Xuanpeng Wang,Jinshuai Liu,Changyuan Guo,Qiao Fan,Xiaoling Ding,Xiaobin Liao,Chunhua Han
出处
期刊:Chemsuschem
[Wiley]
日期:2023-02-17
卷期号:16 (10)
被引量:6
标识
DOI:10.1002/cssc.202300067
摘要
To better satisfy the increasing demands for electric vehicles, it is crucial to develop fast-charging lithium-ion batteries (LIBs). However, the fast-charging capability of commercial graphite anodes is limited by the sluggish Li+ insertion kinetics. Herein, we report a synergistic engineering of uniform nano-sized T-Nb2 O5 particles on graphite (Gr@Nb2 O5 ) with C-O-Nb heterointerfaces, which prevents the growth and aggregation of T-Nb2 O5 nanoparticles. Through detailed theoretical calculations and pair distribution function analysis, the stable existence of the heterointerfaces is proved, which can accelerate the electron/ion transport. These heterointerfaces endow Gr@Nb2 O5 anodes with high ionic conductivity and excellent structural stability. Consequently, Gr@10-Nb2 O5 anode, where the mass ratio of T-Nb2 O5 /graphite=10/100, exhibits excellent cyclic stability and incredible rate capabilities, with 100.5 mAh g-1 after 10000 stable cycles at an ultrahigh rate of 20 C. In addition, the synergistic Li+ storage mechanism is revealed by systematic electrochemical characterizations and in situ X-ray diffraction. This work offers new insights to the reasonable design of fast-charging graphite-based anodes for the next generation of LIBs.
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