@article{bd019c328f5142f998300e1f594f56e7,
title = "Electrochemical Performance of Nanosized Disordered LiVOPO4",
abstract = "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.",
author = "Yong Shi and Hui Zhou and Seymour, {Ieuan D.} and Sylvia Britto and Jatinkumar Rana and Wangoh, {Linda W.} and Yiqing Huang and Qiyue Yin and Reeves, {Philip J.} and Mateusz Zuba and Youngmin Chung and Fredrick Omenya and Chernova, {Natasha A.} and Guangwen Zhou and Piper, {Louis F.J.} and Grey, {Clare P.} and Whittingham, {M. Stanley}",
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 ",
year = "2018",
month = jul,
day = "31",
doi = "10.1021/acsomega.8b00763",
language = "English",
volume = "3",
pages = "7310--7323",
journal = "ACS Omega",
issn = "2470-1343",
publisher = "American Chemical Society",
number = "7",
}