Non-aqueous organic high voltage electrolyte additive, non-aqueous organic high voltage electrolyte and lithium ion secondary battery
An electrolyte additive and high-voltage technology, applied in secondary batteries, circuits, electrical components, etc., can solve the threat of battery safety performance, non-aqueous organic electrolyte hysteresis, collapse and other problems, and achieve excellent chemical stability and electrochemical stability. Stability, good cycle performance and discharge capacity, effect of improving cycle performance and discharge capacity
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Embodiment 1
[0066] A preparation method of a non-aqueous organic high-voltage electrolyte additive, comprising the following steps:
[0067] In a glove box filled with high-purity argon, take diethyl phosphite (DEP), add it to a flask filled with anhydrous tetrahydrofuran (THF) (fill the flask two-fifths), seal it with a rubber stopper and turn it out glove box. The flask was transferred to an ice bath, and under the protection of a nitrogen atmosphere, the n-butyl lithium / n-hexane solution of the stoichiometric ratio was drawn with a long needle, and slowly added to the mixed solution containing DEP and THF, the diethyl phosphite The ratio of the molar weight of ester to the molar weight of n-butyl lithium in the n-butyl lithium / n-hexane solution is 1:1. The whole reaction process was vigorously stirred and protected by nitrogen gas, and the reaction was stopped after about 12 hours. After the reaction is finished, the reaction solvent THF and n-hexane reaction solvent are drawn out wi...
Embodiment 2
[0081] The preparation method of a non-aqueous organic high-voltage electrolyte additive is the same as that of Example 1.
[0082] A preparation method of non-aqueous organic high-voltage electrolyte, comprising the following steps:
[0083] lithium salt LiPF 4 C 2 o 4 Dissolve in a non-aqueous organic solvent to make a 1.2mol / L lithium salt solution, stir, the stirring temperature is 20°C, the non-aqueous organic solvent is ethylene carbonate (EC), γ-butyrolactone (GBL), dimethyl A mixed solvent of carbonate (DMC) and diethyl carbonate (DEC) in a volume ratio of 2:1:3:5;
[0084] Add the non-aqueous organic high-voltage electrolyte lithium diethyl phosphite as shown in the formula Ia to the lithium salt solution, and stir to obtain the non-aqueous organic electrolyte B. In terms of mass fraction, the non-aqueous organic electrolyte additive Ia , accounting for 1% of the non-aqueous organic electrolyte.
[0085] Preparation of positive electrode sheet
[0086] The catho...
Embodiment 3
[0089] In a glove box filled with high-purity argon gas, take dibenzyl phosphite, add it to a flask (two-fifths flask) filled with anhydrous tetrahydrofuran (THF), seal it with a rubber stopper and turn it out of the glove box. The flask was transferred to an ice bath, and under the protection of a nitrogen atmosphere, the n-butyl lithium / n-hexane solution of the stoichiometric ratio was drawn with a long needle, and slowly added to the mixed solution containing dibenzyl phosphite and THF. The ratio of the molar weight of dibenzyl phosphite to the molar weight of n-butyl lithium in the n-butyl lithium / n-hexane solution is 1:1. The whole reaction process was vigorously stirred and protected by nitrogen gas, and the reaction was stopped after about 12 hours. After the reaction was finished, the reaction solvent THF and n-hexane reaction solvent were drawn out with a vacuum line to obtain the non-aqueous organic high-voltage electrolyte additive dibenzyl phosphite lithium shown i...
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