Effect of Fluorinated Linear Carbonate on the Performance of High⁃voltage LiNi0.5Co0.2Mn0.3O2 / Artificial Graphite Pouch Cells 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

Hu，Shiguang1,2; Guo，Pengkai2; Qian，Yunxian2; Zhang，Guangzhao2; Wang，Jun3; Deng，Yonghong3; Wang，Chaoyang1

2023-04-25

10.11896/cldb.22050331

Cailiao Daobao/Materials Reports   Impact Factor & Quartile

1005-023X

LiNi Co Mn O 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 Co Mn O 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 Co Mn O / 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.

2 2 2⁃trifluoroethyl) carbonate (MTFEC) 2⁃trifluoroethyl) carbonate (TFEC) bis (2 high⁃voltage electrolytes methyl (2 ternary layered oxides

Chinese

Corresponding

Science and Technology Planning Project of Guangdong Province[2021A0505110001];National Natural Science Foundation of China[22078144];

2-s2.0-85161019617

Scopus

1.Research Institute of Materials Science,South China University of Technology,Guangzhou,510640,China
2.Shenzhen Capchem Technology Co.,Ltd.,Shenzhen,Guangdong,518118,China
3.Department of Materials Science and Engineering,School of Innovation and Entrepreneurship,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Hu，Shiguang,Guo，Pengkai,Qian，Yunxian,等. Effect of Fluorinated Linear Carbonate on the Performance of High⁃voltage LiNi0.5Co0.2Mn0.3O2 / Artificial Graphite Pouch Cells 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[J]. Cailiao Daobao/Materials Reports,2023,37(8).

Hu，Shiguang.,Guo，Pengkai.,Qian，Yunxian.,Zhang，Guangzhao.,Wang，Jun.,...&Wang，Chaoyang.(2023).Effect of Fluorinated Linear Carbonate on the Performance of High⁃voltage LiNi0.5Co0.2Mn0.3O2 / Artificial Graphite Pouch Cells 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.Cailiao Daobao/Materials Reports,37(8).

Hu，Shiguang,et al."Effect of Fluorinated Linear Carbonate on the Performance of High⁃voltage LiNi0.5Co0.2Mn0.3O2 / Artificial Graphite Pouch Cells 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".Cailiao Daobao/Materials Reports 37.8(2023).