异质结
电场
电气工程
电压
光电子学
极化(电化学)
离子
扩散
低压
工程类
材料科学
物理
化学
热力学
量子力学
有机化学
物理化学
作者
Yan Zhang,Wei Zhao,Cong Kang,Shenglu Geng,Jiaming Zhu,Xiangjun Xiao,Yulin Ma,Hua Huo,Pengjian Zuo,Shuaifeng Lou,Geping Yin
出处
期刊:Matter
[Elsevier]
日期:2023-06-01
卷期号:6 (6): 1928-1944
被引量:6
标识
DOI:10.1016/j.matt.2023.03.026
摘要
The high operational capability of fast-charging lithium-ion batteries (LIBs) at low temperatures (<−30°C) is essential for frequency regulation and peak-load shifting of power grids in cold regions. However, the low-temperature performance is seriously plagued by the sluggish Li+ diffusion and high-voltage polarization. Herein, the heterostructure-induced built-in electric field is constructed by selected nitriding of TiNb2O7, which demonstrates high accessibility for accelerated low-temperature dynamics. The introduced charged phase-junction interface enables promoted Li+ diffusion rates, enhanced Li+ adsorption, and reduced lattice strains. The mosaic TiNb2O7/TiNbN2 heterostructure displays an outstanding specific capacity of 241.5 mA h g−1 at −30°C, corresponding to 89% retention compared with that at 25°C. It even delivers a high-capacity retention of 96% at a 5C rate after approximately 1,000 cycles at −30°C. Our work provides new insight into structure-function relationships for developing fast-charging batteries for cold-region accumulation of electric energy.
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