Product Introduction Hexafluorocyclophosphazene is a white to light yellow crystal mainly used as a flame retardant in lithium battery electrolytes, and can also be used in fields such as lubricants, semiconductors, or liquid crystal display substrates. Application of Hexafluorocyclotriphosphazene Lithium ion batteries are widely used in 3C electronic products due to their high energy density and good cycling performance. With the rapid increase in energy demand, the performance of lithium-ion batteries in various aspects is also constantly improving, resulting in the expanding application range of lithium-ion batteries. Currently, they have huge market prospects in electric vehicles, energy storage systems, aerospace and other fields. High temperature is an application environment that lithium-ion batteries must face. Whether the heat comes from the heat generated during the battery charging and discharging process or from the external high temperature environment, it usually leads to rapid capacity degradation, failure, and even safety issues such as fire and explosion. Therefore, it is urgent to improve the high-temperature resistance performance of lithium-ion batteries and enhance their stability under high temperature cycling. Research has shown that the main reason for the decay of lithium-ion batteries at high temperatures is the change in the EEI layer caused by the side reaction between the electrolyte and the electrode interface, as well as the decomposition and gas production of the electrolyte itself. Therefore, adjusting the composition and structure of the electrolyte can effectively improve the stability of the battery at high temperatures. The CN118017004A patent provides an electrolyte suitable for high-temperature lithium-ion batteries and lithium-ion batteries. The steps for preparing the electrolyte are as follows: Mix ethylene carbonate and dimethyl carbonate in a mass ratio of 6:4 to prepare a solvent. Then add lithium hexafluorophosphate to the solvent, stir thoroughly to dissolve, and add fluoroethylene carbonate. Then add hexafluorocyclophosphazene. The mass ratio of solvent, lithium hexafluorophosphate, hexafluorocyclophosphazene, and fluoroethylene carbonate is 83:12:1:4. The present invention patent is based on carbonate organic solvents and lithium hexafluorophosphate, and introduces solvation structure regulators and film-forming additives to improve the high-temperature cycling stability of lithium-ion batteries. In carbonate electrolytes, there is a strong interaction between Li+and carbonate solvents, forming a Li+solvation structure. By adding hexafluorocyclophosphazene and its derivatives to regulate the solvation structure of Li+and change the coordination configuration of Li+, the decomposition of LiPF6 at high temperatures can be inhibited, the ion conductivity of the electrolyte can be improved, and the desolvation kinetics can be enhanced.
References CN118017004A An electrolyte suitable for high-temperature lithium-ion batteries and lithium-ion batteries.
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