氟代线性碳酸酯对高电压LiNi0.5Co0.2Mn0.3O2/人造石墨软包电池性能的影响

doi:10.11896/cldb.22050331

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Abstract LiNi_0.5Co_0.2Mn_0.3O₂ cathode material is considered as one of the most promising cathode materials for high energy density lithium ion battery due to its high energy density, good cycling stability and high safety. However, LiNi_0.5Co_0.2Mn_0.3O₂ cathode material suffers from rapid capacity decay under high-voltage conditions due to the poor oxidation resistance of conventional carbonate-based electrolytes. Based on fluoroethylene carbonate (FEC), the cycle stability of fluorinated linear carbonates such as bis(2,2,2-trifluoroethyl) carbonate (TFEC) and methyl (2,2,2-trifluoroethyl) carbonate (MTFEC) replacing diethyl carbonate (DEC) were studied under high voltage. Electrochemical test results showed that the capacity retention of 4.5 V LiNi_0.5Co_0.2Mn_0.3O₂/artificial graphite pouch cells increased from 45.5% to 72.5% and 81.6% after 700 cycles at 45 ℃ after TFEC and MTFEC replaced DEC. Linear sweep voltammetry (LSV), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman spectroscopy (Raman) and inductively coupled plasma atomic emission spectroscopy (ICP-OES) studies proved that TFEC and MTFEC had better oxidation resistance at high voltage than DEC. They could obviously inhibit the oxidation decomposition of electrolyte on the surface of the high-voltage cathode, effectively protect the interface stability of cathode and anode materials, and mitigate the damage of solid electrolyte interphase (SEI) film caused by the dissolution of transition metal ions from cathode materials. Fluorinated linear carbonates as electrolyte solvents are of great promise in the application of high-voltage lithium ion batteries.

Key words： ternary layered oxides high-voltage electrolytes bis(2,2,2-trifluoroethyl) carbonate (TFEC) methyl (2,2,2-trifluoroethyl) carbonate (MTFEC)

Published: 25 April 2023 Online: 2023-04-24

CLC number:

TM911.3

Fund:Key-Area Research and Development Program of Guangdong Province (2020B090919001), Science and Technology Planning Project of Guangdong Province (2021A0505110001) and the National Natural Science Foundation of China (22078144).

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	Articles by authors
	HU Shiguang
	GUO Pengkai
	QIAN Yunxian
	ZHANG Guangzhao
	WANG Jun
	DENG Yonghong
	WANG Chaoyang

Cite this article:

HU Shiguang,GUO Pengkai,QIAN Yunxian, et al. Effect of Fluorinated Linear Carbonate on the Performance of High-voltage LiNi_0.5Co_0.2Mn_0.3O₂/Artificial Graphite Pouch Cells[J]. Materials Reports, 2023, 37(8): 22050331-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22050331 OR http://www.mater-rep.com/EN/Y2023/V37/I8/22050331

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