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

Autor:	Andrey V. Mironov, Evgeny V. Antipov, Maria A. Kirsanova, Ilya V. Tertov, Anastasia M. Alekseeva, Artem M. Abakumov, Oleg A. Drozhzhin
Rok vydání:	2021
Předmět:	Materials science General Chemical Engineering Diffusion Intercalation (chemistry) Analytical chemistry chemistry.chemical_element Vanadium Triclinic crystal system Electrochemistry Redox Ion chemistry Lithium
Zdroj:	Electrochimica Acta. 389:138759
ISSN:	0013-4686
DOI:	10.1016/j.electacta.2021.138759
Popis:	A novel polymorph of lithium vanadium pyrophosphate has been obtained using electrochemical Na+ for Li+ exchange in β-NaVP2O7. β-LiVP2O7 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 cm2 s−1. A redox process at ~ 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 “β-VP2O7 ↔ β-Li2VP2O7” two-electron process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f5edae9476486189def98eb1d0d89526 https://doi.org/10.1016/j.electacta.2021.138759 Zobrazit plný text záznamu Full Text from ScienceDirect