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Volume 1
Issue 1
10.3390/liquids1010005
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Article

LiCoO2/Graphite Cells with Localized High Concentration Carbonate Electrolytes for Higher Energy Density

by
Xin Ma
1,†,
Peng Zhang
2,†,
Huajun Zhao
1,
Qingrong Wang
1,
Guangzhao Zhang
1,
Shang-Sen Chi
1,
Zhongbo Liu
3,
Yunxian Qian
3,
Jun Wang
1,*,
Chaoyang Wang
4,* and
Yonghong Deng
1,*
1
Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Department of Materials Science & Engineering, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
2
Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China
3
Shenzhen CAPCHEM Technology Co. Ltd., Shabo Tongfuyu Industry Zone, Pingshan New District, Shenzhen 518118, China
4
Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
*
Authors to whom correspondence should be addressed.
†
These authors (X.M. and P.Z.) contributed equally to this work.
Academic Editor: Isidora Cekic-Laskovic
Liquids 2021, 1(1), 60-74; https://doi.org/10.3390/liquids1010005
Received: 15 September 2021 / Revised: 7 November 2021 / Accepted: 8 November 2021 / Published: 10 November 2021
(This article belongs to the Special Issue Electrolytes for High-Performance Rechargeable Batteries)
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Abstract

Widening the working voltage of lithium-ion batteries is considered as an effective strategy to improve their energy density. However, the decomposition of conventional aprotic electrolytes at high voltage greatly impedes the success until the presence of high concentration electrolytes (HCEs) and the resultant localized HCEs (LHCEs). The unique solvated structure of HCEs/LHCEs endows the involved solvent with enhanced endurance toward high voltage while the LHCEs can simultaneously possess the decent viscosity for sufficient wettability to porous electrodes and separator. Nowadays, most LHCEs use LiFSI/LiTFSI as the salts and β-hydrofluoroethers as the counter solvents due to their good compatibility, yet the LHCE formula of cheap LiPF6 and high antioxidant α-hydrofluoroethers is seldom investigated. Here, we report a unique formula with 3 mol L−1 LiPF6 in mixed carbonate solvents and a counter solvent α-substituted fluorine compound (1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether). Compared to a conventional electrolyte, this formula enables dramatic improvement in the cycling performance of LiCoO2//graphite cells from approximately 150 cycles to 1000 cycles within the range of 2.9 to 4.5 V at 0.5 C. This work provides a new choice and scope to design functional LHCEs for high voltage systems. View Full-Text
Keywords: lithium-ion batteries; lithium cobalt oxides; lithium hexafluorophosphate; localized high concentration electrolytes; 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether lithium-ion batteries; lithium cobalt oxides; lithium hexafluorophosphate; localized high concentration electrolytes; 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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MDPI and ACS Style

Ma, X.; Zhang, P.; Zhao, H.; Wang, Q.; Zhang, G.; Chi, S.-S.; Liu, Z.; Qian, Y.; Wang, J.; Wang, C.; Deng, Y. LiCoO2/Graphite Cells with Localized High Concentration Carbonate Electrolytes for Higher Energy Density. Liquids 2021, 1, 60-74. https://doi.org/10.3390/liquids1010005

AMA Style

Ma X, Zhang P, Zhao H, Wang Q, Zhang G, Chi S-S, Liu Z, Qian Y, Wang J, Wang C, Deng Y. LiCoO2/Graphite Cells with Localized High Concentration Carbonate Electrolytes for Higher Energy Density. Liquids. 2021; 1(1):60-74. https://doi.org/10.3390/liquids1010005

Chicago/Turabian Style

Ma, Xin, Peng Zhang, Huajun Zhao, Qingrong Wang, Guangzhao Zhang, Shang-Sen Chi, Zhongbo Liu, Yunxian Qian, Jun Wang, Chaoyang Wang, and Yonghong Deng. 2021. "LiCoO2/Graphite Cells with Localized High Concentration Carbonate Electrolytes for Higher Energy Density" Liquids 1, no. 1: 60-74. https://doi.org/10.3390/liquids1010005

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