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Affiliation of Author(s):材料科学与技术学院

Journal:ChemElectroChem

Abstract:High-voltage Li2SiO3-composited LiNi0.5Mn1.5O4hollow spheres synthesized through a scalable in situ aerosol spray pyrolysis process combined with short-term high-temperature calcination are investigated as an ultralong-life cathode for high-energy Li-ion batteries. The phase structure, morphology, and valence state of the LiNi0.5Mn1.5O4/Li2SiO3composites are investigated by using X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy. The three-dimensional Li-ion conductor Li2SiO3can effectively enhance the Li+diffusion rate, alleviate the side reactions, and reduce the formation of a solid electrolyte interphase (SEI) as a protective layer between the LiNi0.5Mn1.5O4electrode and electrolyte interfaces. Li2SiO3-composited LiNi0.5Mn1.5O4has a better rate and cycling performance, especially long cycling performance. After 500 cycles at 25 °C at 1 C, the capacity retention of the composite is 93.28 %, and the capacity retention is 81.23 % after 400 cycles at 50 °C at 1 C rate. The excellent long cycling and capacity retention indicate that the three-dimensional Li-ion conductor Li2SiO3composite with LiNi0.5Mn1.5O4is a promising material for high-energy Li-ion batteries. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Translation or Not:no

Date of Publication:2018-04-01

Co-author:聂平,蒋江明,吴宇婷,付瑞瑞,徐桂银,张雅迪,Zhang Xiaogang

Correspondence Author:Zhang Xiaogang,Dou Hui