Synthesis method of tris(trimethylsilyl) phosphate

Abstract

The invention relates to a synthesis method of a tris(trimethylsilyl) phosphate, which comprises the following steps: reacting hexamethyldisilazane with a phosphate for 2 to 5 hours at the temperature of 80 to 160 DEG C so as to form a tris(trimethylsilyl) phosphate and ammonia; then carrying out rectification and purification on the obtained crude product so as to obtain a fine product of the tris(trimethylsilyl) phosphate. The method has the advantages of simple operation, easy-taking raw material and simple post-processing, is suitable for industrial production, and can synthesize high quality product.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a synthesis method of tris(trimethylsilyl)phosphate. Tris(trimethylsilyl)phosphate can be used as electrolyte additive for lithium-ion batteries. Background technique [0002] The three (trimethylsilyl) phosphates referred to in the present invention have the following structure: [0003] [0004] Research has found that tris(trimethylsilyl) phosphate can be used as an electrolyte additive for lithium-ion batteries to improve the performance of lithium-ion batteries. In US20080166637A1, tris(trimethylsilyl) phosphate is used as an electrolyte additive for power batteries. In Chinese patent CN1840550A it is pointed out that tris(trimethylsilyl) phosphate is a composition for electrolyte and a polymer electrolyte capable of suppressing a decrease in capacity when the battery is stored in a charged state. The high-molecular-weight electrolyte includes an electrolytic solution...

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Problems solved by technology

[Zh.Obshch.Khim., 1985, 55(8): 1674] The raw material hexamethyldisilathane used in this method is highly toxic and has no industrial products. Another raw material P 4 o 10 It is also very dangerous, not easy to operate, and the reaction temperature is high and the time is long, so this method is not suitable for industrial production

[0007] 2. Hexamethyldisilazane and P 4 o 10 Heating and reacting for 2 hours, but the yield is only within 20%, [Zh.Obshch.Khim., 1985,55(8):1883]. This method also uses the dangerous and difficult raw material P 4 o 10 , and the yield of the reaction is extremely low, so this method is not suitable for industrial production

[0009] The methods reported in the above literature have the disadvantages of high toxicity of raw materials, danger, long reaction time or low product yield.

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