Effects of Esters Used in Liquid Electrolyte for Li(Ni0.6Mn0.2Co0.2)O2/Graphite Pouch Cells Under Fast Charging

电解质 碳酸乙烯酯 电导率 粘度 化学 溶剂 无机化学 碳酸二甲酯 离子电导率 离子液体 化学工程 材料科学 有机化学 电极 物理化学 甲醇 复合材料 工程类 催化作用
作者
Xianyang Wu,Tianyi Liu,Kejie Zhao,Feng Lin,David L. Wood,Ilias Belharouak,Zhijia Du
出处
期刊:Meeting abstracts 卷期号:MA2019-02 (5): 321-321
标识
DOI:10.1149/ma2019-02/5/321
摘要

Electrolyte plays a critical role in lithium ion batteries (LIBs) as it determines the ion conductivity and dictates the formation of solid electrolyte interphase (SEI) 1 . Typically it consists of cyclic carbonate and linear carbonate, and it is believed via combination of cyclic carbonate possessing high polarity and dielectric constant but high viscosity while linear carbonate with low polarity, low dielectric constant and lower viscosity, the mixed solvent will provide satisfactory performance. Nowadays urgent needs for high performance LIBs from electrical vehicles (EVs) industry propel the development of LIBs capable of fast charging, and addition of esters possessing lower viscosity 2,3 into the commonly used liquid electrolyte as cosolvents is considered as a possible solution to this problem. Herein performance of esters including Ethyl Acetate (EA), Methyl Acetate (MeOAC) and Ethyl Formate (EF) are investigated via cycling tests. Firstly, physical properties (viscosity, ion conductivity and transfer numbers) of the blended electrolyte systems, consisting of 1.2 mol/L LiPF 6 solvated in EC/EMC/Esters (30:50:20 wt%) are studied. Experimental results clearly show the improvement of ionic conductivity with adding the four esters compared to baseline electrolyte (1.2 mol/L LiPF 6 in EC/EMC. For viscosity, the electrolytes with ester co-solvents all have lower viscosity than the baseline electrolyte over all the salt concentrations. Cycling tests are also performed for 520mAh Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 /graphite pouch cells between 2.8V-4.2V at 30°C. The cells were charged at 4C (charging ends at 15 minute) and discharged at 1C, and the result is shown in Figure 1. The cell performance and analysis will be presented during the meeting. References: [1] Xu, Kang. "Electrolytes and interphases in Li-ion batteries and beyond." Chemical reviews 114.23 (2014): 11503-11618. [2] Ma, Xiaowei, et al. "A study of highly conductive ester co-solvents in Li [Ni 0.5 Mn 0.3 Co 0.2 ] O 2 /Graphite pouch cells." Electrochimica Acta 270 (2018): 215-223. [3] Smart, M. C., B. V. Ratnakumar, and S. Surampudi. "Use of organic esters as cosolvents in electrolytes for lithium-ion batteries with improved low temperature performance." Journal of The Electrochemical Society 149.4 (2002): A361-A370. Figure 1. Cycling performance for the 4 blended electrolyte using EF, MeOAC, EtOAC and DMC Figure 1

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