Composite solid electrolyte and preparation method thereof
A solid electrolyte and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of low battery capacity, electrolyte depletion, interface impedance increase, etc., to improve ion transmission and performance The effect of electron conductivity
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[0031] The invention provides a preparation method of a composite solid electrolyte, the method comprising the use of polyether diol, 2,6-toluene diisocyanate, catalyst and chain extender mixed reaction to obtain a polyurethane prepolymer; in an inert gas atmosphere Specifically, for example, under an argon atmosphere, disperse lithium salt and inorganic solid electrolyte into 1,3-dioxolane, then add a certain amount of initiator and plasticizer, and obtain a precursor after uniform dispersion Solution: adding the precursor solution to the polyurethane prepolymer, stirring and mixing evenly, standing still, raising the temperature to 70-75° C., and keeping the temperature for 6-8 hours to obtain the composite solid electrolyte.
[0032] In the technical scheme provided by the present invention, polyether diol is first mixed with 2,6-toluene diisocyanate, and after adding a catalyst and a chain extender, gradually add polymerization to synthesize a polyurethane prepolymer; Add ...
Embodiment 1
[0046] A method for preparing a composite solid electrolyte, comprising the following steps:
[0047] (1) Add polyoxypropylene diol (purchased from Dow Chemical) to the reaction vessel, heat up to 110°C, evacuate to 30Pa and keep for 2 hours, then cool down to 58°C, add 2,6-toluene diisocyanate, After the addition, the temperature was raised to 85°C, and the catalyst dibutyltin dilaurate was added to react for 3 hours, then the temperature was lowered to 75°C, and the chain extender 2,2-dimethylolpropionic acid was added to react for 3 hours, and gradually added and polymerized to obtain the The polyurethane prepolymer described above;
[0048] The molar ratio of the polyether diol to 2,6-toluene diisocyanate is 1:2.8;
[0049] The addition of the catalyst is 4% of the total weight of the polyurethane prepolymer;
[0050] The addition of the chain extender is 0.12% of the total weight of the polyurethane prepolymer;
[0051] (2) Under an argon atmosphere, lithium salt bis(t...
Embodiment 2
[0058] A method for preparing a composite solid electrolyte, comprising the following steps:
[0059] (1) Add polyoxypropylene diol (purchased from Dow Chemical) to the reaction vessel, heat up to 110°C, evacuate to 30Pa and keep for 2 hours, then cool down to 58°C, add 2,6-toluene diisocyanate, After the addition, the temperature was raised to 85°C, the catalyst dibutyltin dilaurate was added to react for 2 hours, then the temperature was lowered to 80°C, and the chain extender 2,2-dimethylolpropionic acid was added to react for 2 hours, and gradually added and polymerized to obtain the The polyurethane prepolymer described above;
[0060] The molar ratio of the polyether diol to 2,6-toluene diisocyanate is 1:2.5;
[0061] The addition of the catalyst is 3% of the total weight of the polyurethane prepolymer;
[0062] The added amount of the chain extender is 0.01% of the total weight of the polyurethane prepolymer;
[0063] (2) Under an argon atmosphere, lithium salt bis(t...
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