Open AccessEnhanced electrochemical performances of LiNi0.5Mn1.5O4 by surface modification with Cu nanoparticles
Author(s) -
Guiying Zhao,
Yanyu Lin,
Weibo Zhu,
Wenyu Yang,
Zhigao Huang
Publication year - 2017
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb150906021z
Subject(s) - materials science , dielectric spectroscopy , electrochemistry , surface modification , lithium (medication) , coating , spinel , cathode , chemical engineering , nanoparticle , diffusion , analytical chemistry (journal) , nanotechnology , electrode , metallurgy , chemistry , engineering , medicine , physics , chromatography , endocrinology , thermodynamics
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°C, 25°C, 60°C), is investigated systematically by the charge/discharge testing, cyclic voltammograms and impedance spectroscopy, respectively. The results demonstrate that the modified material exhibits remarkably enhanced electrochemical reversibility and stability. 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, acted as a highly efficient protector to restrain the contact loss