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Title: Electrochemical Performance of Nanosized Disordered LiVOPO 4

Journal Article · · ACS Omega

ε-LiVOPO4 is a promising multielectron cathode material for Li-ion batteries that can accommodate two electrons per vanadium, leading to higher energy densities. However, poor electronic conductivity and low lithium ion diffusivity currently result in low rate capability and poor cycle life. To enhance the electrochemical performance of ε-LiVOPO4, in this work, we optimized its solid-state synthesis route using in situ synchrotron X-ray diffraction and applied a combination of high-energy ball-milling with electronically and ionically conductive coatings aiming to improve bulk and surface Li diffusion. We show that high-energy ball-milling, while reducing the particle size also introduces structural disorder, as evidenced by 7Li and 31P NMR and X-ray absorption spectroscopy. We also show that a combination of electronically and ionically conductive coatings helps to utilize close to theoretical capacity for ε-LiVOPO4 at C/50 (1 C = 153 mA h g-1) and to enhance rate performance and capacity retention. The optimized ε-LiVOPO4/Li3VO4/ acetylene black composite yields the high cycling capacity of 250 mA h g-1 at C/5 for over 70 cycles.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); National Energy Technology Laboratory (NETL), Pittsburgh, PA and Morgantown, WV (United States); Binghamton Univ., NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
SC0012583; AC02-06CH11357; EE0006852
OSTI ID:
1458803
Alternate ID(s):
OSTI ID: 1460859; OSTI ID: 1498757; OSTI ID: 1508597
Journal Information:
ACS Omega, Journal Name: ACS Omega Vol. 3 Journal Issue: 7; ISSN 2470-1343
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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