β-LiVP2O7 as a positive electrode material for Li-ion batteries

被引：7
作者：
Tertov, Ilya, V [1 ]
Drozhzhin, Oleg A. [1 ,2 ]
Alekseeva, Anastasia M. [1 ]
Kirsanova, Maria A. [2 ]
Mironov, Andrey, V [1 ]
Abakumov, Artem M. [2 ]
Antipov, Evgeny, V [1 ,2 ]
机构：
[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia
[2] Skolkovo Inst Sci & Technol, Moscow 121205, Russia
来源：
ELECTROCHIMICA ACTA | 2021年 / 389卷
基金：
俄罗斯科学基金会;
关键词：
LiVP2O7; Lithium vanadium pyrophosphate; Cathode material; Li-ion batteries; CATHODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; LITHIUM; DIFFUSION; FE; LIVP2O7/C; TRANSPORT; LI2MP2O7; MN;
D O I：
10.1016/j.electacta.2021.138759
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A novel polymorph of lithium vanadium pyrophosphate has been obtained using electrochemical Na+ for Li+ exchange in beta-NaVP2O7. beta-NaVP2O7 has a triclinic KAlP2O7-type structure with large tunnels along the [100] direction and demonstrates electrochemical capacity of 100 mAh g(-1) within a high-voltage region of 4.0-4.2 V vs. Li/Li+ with excellent C-rate capability: increasing discharge current density from C/10 to 10C results in a capacity drop of only 7%. The (de)intercalation process is characterized by a solid solution-like behavior with the diffusion coefficient amounting to 10(-12) - 10(-11) cm(2) s(-1). A redox process at similar to 1.8 V vs. Li/Li+ leads to 200 mAh g(-1) of the overall intercalation capacity within the extended voltage range that corresponds to "beta-VP2O7 <-> beta-Li2VP2O7" two-electron process. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：7
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