Electrochemical Performance of Nanosized Disordered LiVOPO 4 .

Autor:	Shi Y; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Zhou H; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Seymour ID; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K., Britto S; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K., Rana J; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Wangoh LW; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Huang Y; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Yin Q; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Reeves PJ; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K., Zuba M; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Chung Y; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Omenya F; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Chernova NA; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Zhou G; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Piper LFJ; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States., Grey CP; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K., Whittingham MS; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.; Chemistry and Materials Science and Engineering, NECCES, Department of Mechanical Engineering and Materials Science and Engineering Program, and Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2018 Jul 03; Vol. 3 (7), pp. 7310-7323. Date of Electronic Publication: 2018 Jul 03 (Print Publication: 2018).
DOI:	10.1021/acsomega.8b00763
Abstrakt:	ε-LiVOPO 4 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-LiVOPO 4 , 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 7 Li and 31 P 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-LiVOPO 4 at C/50 (1 C = 153 mA h g -1 ) and to enhance rate performance and capacity retention. The optimized ε-LiVOPO 4 /Li 3 VO 4 /acetylene black composite yields the high cycling capacity of 250 mA h g -1 at C/5 for over 70 cycles. Competing Interests: The authors declare no competing financial interest.
Databáze:	MEDLINE
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