Hybrid electrolyte for lithium secondary battery, preparation method thereof, and lithium secondary battery
A lithium secondary battery, secondary battery technology, applied in the field of hybrid electrolyte and its preparation, lithium secondary battery, can solve the thermal stability of the electrolyte, the poor thermodynamic performance of the electrolyte, the thermal stability of the battery, and the poor heat resistance Good and other problems, to achieve the effect of solving thermal stability problems, improving battery safety, and high Young's modulus
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[0077] The present invention also provides a preparation method of a hybrid electrolyte for a lithium secondary battery, comprising the following steps:
[0078] 1) After mixing the ceramic material dispersion and the polymer matrix, compounding on the substrate, and drying to obtain the membrane material;
[0079] 2) The membrane material obtained in the above steps is combined with a liquid electrolyte and then activated to obtain a hybrid electrolyte.
[0080] In the present invention, the selection and composition of the raw materials required in the above-mentioned preparation process, as well as the corresponding optimization principles, can correspond to the selection and composition of the corresponding raw materials in the aforementioned hybrid electrolyte, and the corresponding optimization principles, and will not be repeated here. repeat.
[0081] In the invention, firstly, after mixing the ceramic material dispersion liquid and the polymer matrix, they are compou...
Embodiment 1
[0114] Preparation of hybrid electrolyte: 0.7 g of Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Add it to N-methylpyrrolidone and ultrasonically disperse for 1 hour. Add 0.3 g of PVDF-HFP to the above solution, stir well and pour it on the glass to dry. Activate the dried film bubbles in the electrolyte, and then wipe off the residual electrolyte on the surface. The electrolyte is 1M lithium trifluoromethanesulfonate dissolved in tetraethylene glycol dimethyl ether.
[0115] see figure 1 , figure 1 Schematic diagram of dendrite inhibition by the hybrid electrolyte provided by the present invention.
[0116] see figure 2 , figure 2 The AC impedance spectra at room temperature of the hybrid electrolytes prepared in Examples 1-3 of the present invention and the AC impedance spectra at room temperature of the gel electrolyte prepared in Comparative Example 1.
[0117] Depend on figure 2 It can be seen that with the increase of the amount of ceramic material added, the ionic condu...
Embodiment 2
[0121] Preparation of hybrid electrolyte: 0.3 g of Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Add it to N-methylpyrrolidone and ultrasonically disperse for 1 hour. Add 0.7 g of PVDF-HFP to the above solution, stir well and pour it on the glass to dry. Activate the dried film bubbles in the electrolyte, and then wipe off the residual electrolyte on the surface. The electrolyte is 1M lithium trifluoromethanesulfonate dissolved in tetraethylene glycol dimethyl ether.
[0122] see figure 2 , figure 2 The AC impedance spectra at room temperature of the hybrid electrolytes prepared in Examples 1-3 of the present invention and the AC impedance spectra at room temperature of the gel electrolyte prepared in Comparative Example 1.
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