Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (11): 1301-1308.DOI: 10.11944/j.issn.1000-0518.2020.11.200099

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Effects of Ethyl Orthosilicate on the Electrochemical Performance of High-Voltage Lithium Nickel Manganese Oxide-Based Full-Cell

CAI Mina, WU Chunyana*, XIE Yishunb, BAN Guib, LAI Feiyanb*, HUANG Xiaoyingb, ZHANG Xiaohuib   

  1. aCollege of Chemistry and Engineering, Guangxi Normal University for Nationalities,Chongzuo,Guangxi 532200,China;
    bCollege of Materials and Chemical Engineering,Hezhou University,Hezhou,Guangxi 542899,China
  • Received:2020-04-06 Revised:2020-05-25 Accepted:2020-06-29 Published:2020-11-01 Online:2020-11-04
  • Contact: LAI Feiyan, lecturer; E-mail:fylai112@163.com; Research interests:new energy materials and devices
    Co-corresponding author:WU Chunyan, associate professor; E-mail:wuchunyan117@163.com; Research interests:synthesis of electrochemical new energy materials
  • Supported by:
    Supported by the National Natural Science Foundation of China (No.51964013, No. 51762006), the Guangxi University Middle-aged and Young Teachers' Basic Research Ability Improvement Project (No.2019KY0709), the Hezhou Innovation-Driven Development Project (No.Hekechuang ZX1907001) and the Guangxi University Student Innovation and Entrepreneurship Training Program (No.201911838065)

Abstract: In order to improve the electrochemical performance of LiNi0.5Mn1.5O4 lithium ion batteries, a physical mixing method was used to add ethyl orthosilicate (TEOS) to the negative electrode slurry with the mass ratios of TEOS to graphite of 0∶100, 5∶100, 10∶100, 16∶100 and 20∶100. A 502030-type flexible packaging lithium-ion battery was assembled by using LiNi0.5Mn1.5O4 as the positive electrode and graphite as the negative electrode. The battery was tested for constant current charge and discharge and internal resistance. The test results show that the internal resistance of the 0TEOS(m(TEOS)∶m(graphite)=0∶100) and 16TEOS(m(TEOS)∶m(graphite)=16∶100) batteries are 159 mΩ and 105 mΩ, respectively. After 200 cycles, the capacity retention rates are 52.6% and 65.7%, and the specific discharge capacities are 46 mA·h/g and 62.9 mA·h/g, respectively. The addition of TEOS to the negative electrode slurry through a physical mixing method is beneficial to the formation of a structurally stable artificial solid electrolyte interface(SEI) film on the surface of the negative electrode, and improves the cycling and rate performance of LiNi0.5Mn1.5O4.

Key words: lithium ion battery, lithium nickel manganese oxide, tetraethyl orthosilicate, full battery, electrochemical properties

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