Citation: CAI Min, WU Chunyan, XIE Yishun, BAN Gui, LAI Feiyan, HUANG Xiaoying, ZHANG Xiaohui. Effects of Ethyl Orthosilicate on the Electrochemical Performance of High-Voltage Lithium Nickel Manganese Oxide-Based Full-Cell[J]. Chinese Journal of Applied Chemistry, ;2020, 37(11): 1301-1308. doi: 10.11944/j.issn.1000-0518.2020.11.200099 shu

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

CAI Min ^a ,
WU Chunyan ^a,, ,
XIE Yishun ^b ,
BAN Gui ^b ,
LAI Feiyan ^b,, ,
HUANG Xiaoying ^b ,
ZHANG Xiaohui ^b

a.
College of Chemistry and Engineering, Guangxi Normal University for Nationalities, Chongzuo, Guangxi 532200, China
b.
College of Materials and Chemical Engineering, Hezhou University, Hezhou, Guangxi 542899, China

Corresponding author: WU Chunyan, wuchunyan117@163.com LAI Feiyan, fylai112@163.com
Received Date: 6 April 2020
Revised Date: 25 May 2020
Accepted Date: 29 June 2020

Fund Project: the National Natural Science Foundation of China 51762006the National Natural Science Foundation of China 51964013Supported 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)the Guangxi University Student Innovation and Entrepreneurship Training Program 201911838065the Guangxi University Middle-aged and Young Teachers′ Basic Research Ability Improvement Project 2019KY0709the Hezhou Innovation-Driven Development Project Hekechuang ZX1907001

Figures(6)

In order to improve the electrochemical performance of LiNi_0.5Mn_1.5O₄ 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 LiNi_0.5Mn_1.5O₄ 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 LiNi_0.5Mn_1.5O₄.
- lithium ion battery,
- lithium nickel manganese oxide,
- tetraethyl orthosilicate,
- full battery,
- electrochemical properties
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