Electrolyte is one of the key components of lithium-ion battery. The electrolyte's merits directly determine the cycle performance, rate performance and safety performance of the battery. The traditional LiPF6 based electrolyte is relatively poor in thermal stability, extremely sensitive to water and corrosive by-products, which restricts its performance in high-temperature performance of lithium-ion batteries. Therefore, there is an urgent need to develop new lithium salts with low cost and excellent performance, and to develop new electrolyte systems to replace LiPF6-based electrolytes in order to improve the overall performance of lithium-ion batteries and expand the application of lithium-ion batteries. Lithium borate salts with polyanions are considered to be very promising lithium salts because of their good heat-resistant stability. Recently, relying on the research group led by Liu Zhihong, a researcher of the Qingdao Institute of Energy Storage Industry Technology under the auspices of the Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, a new type of polymerized lithium borate salt, PLTB, has been developed using low-cost raw material tartaric acid. A very promising single-ion conductor polymer electrolyte was prepared by molecular compounding. The electrolyte has high ionic conductivity, wide electrochemical stability window, and good passivation aluminum current collector capability, and is stable even at high temperatures of 120°C. Charge and discharge cycle. At the same time, the research results show that the lithium manganese oxide battery with the polymer electrolyte has much higher temperature cycling stability than the traditional LiPF6 based electrolyte. In addition, the research group also developed single-ion-conductor-electrolyte-coated composite separators with good flame retardancy and higher ion migration numbers, which can greatly improve the cycle stability of commercial lithium cobalt oxide batteries. Relevant research results were published in Electrochimica Acta 92 (2013) 132–138; Electrochimica Acta 141 (2014) 167–172; Solid State Ionics 262 (2014) 747–753; Journal of The Electrochemical Society 2015, 162, A834–A838, and Apply for two Chinese invention patents. Recently, the research group developed polyalcohol-based lithium borate salts PLPB and PLDB based on monomers such as pentaerythritol. These two lithium salt single-ion-conductor polymer electrolytes also exhibit good ionic conductivity and a wide electrochemical stability window. And good high temperature battery performance. Relevant research results were published in Journal of Materials Chemistry A, 2015, DOI: 10.1039/C5TA00216H; Coordination Chemistry Reviews (2015, doi:10.1016/j.ccr.2015.02.011). The above research was supported by the National Natural Science Foundation of China and the nanometer project of the strategic direction of the Chinese Academy of Sciences.
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