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Fluorinated solvents for high-voltage electrolyte in lithium-ion battery

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Abstract

The major obstacle for the application of high-voltage cathode materials is the anodic instability of the electrolyte. On the guidance of density functional theory calculation, we develop a new high-voltage electrolyte comprising 1 mol L−1 LiPF6 dissolved in fluoroethylene carbonate (FEC) and ethyl difluoroacetate (DFEAc) (FEC/DFEAc = 3:7 in wt.% ratio). It shows a high conductivity (9.48 mS cm−1) and high anodic stability compared with the conventional electrolyte of 1 mol L−1 LiPF6 dissolved in ethylene carbonate (EC) and ethyl-methyl carbonate (EMC) (EC/EMC = 3:7 in wt.% ratio). In addition, Li/LiNi0.5Co0.2Mn0.3O2 half-cells with the new electrolyte display an excellent cycling ability with capacity retention of 89.23% after 100 cycles at 4.6 V (vs. Li/Li+). Although the electrolyte still will be oxidized at the cathode surface, the Li2CO3 and carbon-fluoride species originated from DFEAc and FEC are beneficial to building a stable cathode/electrolyte interface as revealed by the TEM and XPS results.

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Acknowledgments

The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. 51574287) and the National Basic Research Program of China (Grant No. 2014CB643406).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Guochun Yan, Xinhai Li, Zhixing Wang, Huajun Guo, Wenjie Peng, Qiyang Hu & Jiexi Wang

  2. Chimie du Solide-Energie, Collège de France, 11 Place Marcelin Berthelot, 75005, Paris, France

    Guochun Yan

  3. Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong

    Jiexi Wang

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  1. Guochun Yan
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  2. Xinhai Li
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Correspondence to Xinhai Li.

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Yan, G., Li, X., Wang, Z. et al. Fluorinated solvents for high-voltage electrolyte in lithium-ion battery. J Solid State Electrochem 21, 1589–1597 (2017). https://doi.org/10.1007/s10008-017-3508-4

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  • DOI: https://doi.org/10.1007/s10008-017-3508-4

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