Enhanced electrochemical performances of LiNi0.5Mn1.5O4 by surface modification with Cu nanoparticles

  • zhao Guiying College of Physics and Energy，Fujian Normal University,Fuzhou , China
  • Lin Yinbin Fujian Normal University
  • Zhu Weibo Fujian Normal University
  • Yang Wenyu Fujian Normal University
  • Huang Zhigao Fujian Normal University

Abstract


5V spinel LiNi0.5Mn1.5O4 cathode is prepared by traditional solid-state method and nano-Cu particles were derived from a chemical reduction process. The effect of Cu-coating on the electrochemical performances of LiNi0.5Mn1.5O4 cells, in a wide operation temperature range (-10℃, 25℃,60℃), is investigated systematically by the charge/discharge testing, cyclic voltammograms and impedance spectroscopy, respectively. The results of electrochemical experiments demonstrate that the modified material exhibits remarkably enhanced electrochemical reversibility and stability in a wide operation temperature range. Cu-coated material has much lower surface and charge-transfer resistances and shows a higher lithium diffusion rate. The Cu coating layer as a highly efficient lithium ion conductor, protected the surface of the active materials from HF generated by the decomposition of LiPF6 in the electrolyte during electrochemical cycling and acted as a highly efficient protector to restrain the contact loss.

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Published
2016/12/31
How to Cite
Guiying, zhao, Yinbin, L., Weibo, Z., Wenyu, Y., & Zhigao, H. (2016). Enhanced electrochemical performances of LiNi0.5Mn1.5O4 by surface modification with Cu nanoparticles. Journal of Mining and Metallurgy, Section B: Metallurgy, 53(1), 61-66. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/9004
Issue
Vol. 53 No. 1 (2017)
Section
Original Scientific Paper

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