Electrochemical Performance of Nanosized Disordered LiVOPO4

Yong Shi, Hui Zhou, Ieuan D. Seymour, Sylvia Britto, Jatinkumar Rana, Linda W. Wangoh, Yiqing Huang, Qiyue Yin, Philip J. Reeves, Mateusz Zuba, Youngmin Chung, Fredrick Omenya, Natasha A. Chernova, Guangwen Zhou, Louis F.J. Piper, Clare P. Grey, M. Stanley Whittingham* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)7310-7323
Number of pages14
JournalACS Omega
Issue number7
Early online date3 Jul 2018
Publication statusPublished - 31 Jul 2018

Bibliographical note

This research was funded by U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) program under BMR award no. DE-EE0006852. The structural characterization using NMR and XAS techniques was supported by the North East Center for Chemical Energy Storage(NECCES), an Energy Frontier Research Center supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under award no. DE-SC0012583. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. We appreciate skillful assistance from Dr. Wenqian Xu at beamline17-BM-B, Dr. Tianpin Wu at 9-BM-B, and Dr. Mahalingam Balasubramanian at 20-BM-B, Advanced Photon Source, Argonne National Laboratory. We also thank Dr. Fengxia Xin,Dr. Xiaoya Wang, Jun Feng for many helpful discussions

Data Availability Statement

The Supporting Information is available free of charge on theACS Publications websiteat DOI:10.1021/acsomega.8b00763.


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