Liu Mengchuang, Zeng Ziqi, Zhong Wei, Ge Zicheng, Li Longqing, Lei Sheng, Wu Qiang, Zhang Han, Cheng Shijie, Xie Jia
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
J Colloid Interface Sci. 2022 Aug;619:399-406. doi: 10.1016/j.jcis.2022.03.133. Epub 2022 Mar 29.
Lithium-ion batteries with Ni-rich cathode and flammable carbonate electrolytes are breeding severe safety concerns which hinds their application in electric vehicles. Herein, by introducing the fluorobenzene (FB) with low-density and low-cost as a cosolvent and bridge solvents in triethyl phosphate (TEP)-based diluted high-concentration electrolytes (DHCEs) system, we design a non-flammable electrolyte with a special solvation structure containing internal-external flame retardants. This non-flammable electrolyte not only solves successfully the incompatibility problem of TEP-based electrolyte to the Li-metal anode (LMA) and the graphite (Gr) anode, but also ensures the stable cycling of Li||LiNiCo.Mn.O (86% capacity retention after 120 cycles) and Gr|| LiNiCo.Mn.O (75% capacity retention after 200 cycles) full cells. Such design opens up a new window for developing new electrolyte systems and building safer high-energy-density batteries.
具有富镍阴极和易燃碳酸酯电解质的锂离子电池引发了严重的安全问题，这阻碍了它们在电动汽车中的应用。在此，通过引入低密度、低成本的氟苯（FB）作为共溶剂和桥连溶剂，在基于磷酸三乙酯（TEP）的稀释高浓度电解质（DHCEs）体系中，我们设计了一种具有特殊溶剂化结构的非易燃电解质，该结构包含内部和外部阻燃剂。这种非易燃电解质不仅成功解决了基于TEP的电解质与锂金属阳极（LMA）和石墨（Gr）阳极的不相容问题，还确保了锂||LiNiCo.Mn.O（120次循环后容量保持率为86%）和Gr||LiNiCo.Mn.O（200次循环后容量保持率为75%）全电池的稳定循环。这种设计为开发新的电解质体系和构建更安全的高能量密度电池开辟了新的窗口。
