阳极
材料科学
电化学
锂(药物)
钙钛矿(结构)
电解质
钛酸锂
化学工程
空位缺陷
离子
锂离子电池
电极
电池(电)
化学
热力学
物理化学
医学
功率(物理)
物理
有机化学
工程类
结晶学
内分泌学
作者
Huaibing Liu,Jingchao Xiao,Kuo Cao,Naiqing Ren,Haiyan He,Yixuan Li,Juntao Si,Sihan Zeng,Bicai Pan,Chunhua Chen
标识
DOI:10.1016/j.cej.2023.147765
摘要
On account of the low operating potential and slow electrochemical kinetics, graphite anode suffers from poor rate performance and severe safety problems in lithium-ion batteries (LIBs). Therefore, it’s urgent to find alternatives. Due to the abundant intrinsic vacancies and ion migration channels, A-site deficient perovskites could be used as not only solid state electrolytes (SSEs), but also anodes for LIBs. Here, Li0.38Pr0.54TiO3 is firstly demonstrated as a high-rate anode material without any additional modification. With an average operating potential of 0.76 V vs. Li+/Li, the Li0.38Pr0.54TiO3 anode possesses a high specific capacity of 217 mAh/g at 0.1C (1C = 200 mA g−1), impressive rate capability (124 mAh/g at 40C), and excellent cycling performance (96.75 % capacity retention over 2100 cycles at 10C). Through in-situ analysis and theoretical computations, we confirm the outstanding performance originates from small cell volume change (5.98 %), low band gap (2.57 eV), and low diffusion energy barrier (0.11 eV). The LiFePO4//Li0.38Pr0.54TiO3 full cell shows superior cycling stability (79.78 % capacity retention over 1000 cycles at 5C). Moreover, the relationship between A-site structure and electrochemical properties is discussed from the perspective of vacancy concentration. Our finding also provides a novel perspective for the discovery of high-performance oxide perovskite anodes.
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