Quality Lithium Tetrafluoroborate molecular formula LiBF4, molecular weight 93.74, mainly used as electrolyte lithium salt for lithium ion battery electrolyte. With the rapid development of mobile communications and portable electrical appliances in modern society, lithium-ion secondary batteries have been widely used in people’s daily lives due to their high energy density, high working voltage, small memory effect, low self-discharge rate, lightness and convenience, etc. application. At present, the classic electrolyte system used in lithium-ion secondary batteries is that electrolyte salts are dissolved in organic aprotic solvents. As one of the basic raw materials of lithium-ion batteries, the electrolyte directly affects the working performance of lithium-ion batteries.
In comparison, quality Lithium Tetrafluoroborate has good chemical and thermal stability, and is sensitive to environmental water distribution. It is hoped that it will develop into an excellent electrolyte system widely used in the field of energy storage and power lithium-ion batteries. At present, the preparation methods of lithium tetrafluoroborate include aqueous solution method, gas-solid reaction method and non-aqueous solution method. The aqueous solution method uses hydrofluoric acid, boric acid and lithium carbonate as raw materials. The process conditions are mild, no explosive chemicals are involved, and the synthesis is simple and safe; however, the product obtained by the aqueous solution method is a monohydrate quality Lithium Tetrafluoroborate that is easily soluble in itself when heated when it is dried. The crystal water turns into a molten state, making it difficult to dehydrate, and the content of insoluble matter is relatively high.
At present, quality Lithium Tetrafluoroborate is mainly used as a LiBF6-based electrolyte system additive to improve cycle life and improve the performance of lithium-ion batteries; as a film-forming additive, quality Lithium Tetrafluoroborate has been widely used in current electrolytes. The addition of LiBF4 can broaden lithium ions The operating temperature range of the battery improves the high and low temperature discharge performance of the battery.