An organic-inorganic composite quasi-solid electrolyte and quasi-solid lithium battery
An inorganic composite, organic electrolyte technology, applied in non-aqueous electrolyte batteries, electrolyte immobilization/gelation, lithium batteries, etc., can solve the problems of poor interface contact, insufficient ionic conductivity, low ionic conductivity at room temperature, etc. Achieve the effect of improving poor interface problems, achieving stable work, and achieving performance
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[0034] Preparation of electrolyte membrane: roll the above colloidal composite quasi-solid electrolyte between two PTFE (polytetrafluoroethylene) membranes to obtain a quasi-solid electrolyte membrane with a thickness of 150-350 μm, and cut it into a disc shape with a punch The electrolyte membrane is used for the subsequent assembly of button-type quasi-solid-state lithium batteries. In one example, the disc-shaped electrolyte membrane has a diameter of 13-18 mm, which is suitable for the electrolyte diameter range of the button lithium battery mold size.
[0035] In the following examples, the preparation method of the quasi-solid lithium battery is as follows:
[0036] Preparation and coating of the positive electrode: the positive electrode material is preferably lithium iron phosphate, the binder is selected from one of PVDF, PTFE, etc., and the conductive agent is selected from carbon black, Super P, KB and other carbon materials. Put the positive electrode material, bi...
Embodiment 1
[0039] This embodiment provides a composition consisting of lithium lanthanum zirconium oxide inorganic ion conductor, N-butyl-N-methyl bistrifluoromethanesulfonimide salt ionic liquid and tetraethylene glycol dimethyl in which lithium salt is dissolved. Ether composite quasi-solid electrolyte, the specific steps of preparation are as follows:
[0040] Step 1: Dissolve lithium bistrifluoromethanesulfonimide in tetraethylene glycol dimethyl ether solvent at a concentration of 0.5 mol / L in a glove box filled with protective gas and having an oxygen content and a moisture content of less than 1 ppm , stirred with a magnetic stirrer for 12 hours to obtain a clear solution; the prepared tetraethylene glycol dimethyl ether solution and the ionic liquid N-butyl-N-methylbistrifluoromethanesulfonimide salt were compared according to the volume ratio in the following table Mix and stir for 12 hours with a magnetic stirrer to obtain the organic liquid phase components of the quasi-solid ...
Embodiment 2
[0046] This example provides a method for testing the battery cycle performance of a button-type full battery by assembling the quasi-solid electrolyte prepared in Example 1 and the positive and negative electrodes. The specific steps are as follows:
[0047] Step 1, assemble the quasi-solid electrolyte membrane prepared in Example 1, lithium metal negative electrode and lithium iron phosphate positive electrode into a CR2032 button-type quasi-solid lithium battery.
[0048] Step 2, charge the button-type quasi-solid-state lithium-ion battery assembled in step 1 to 3.8V at 25°C at a current of 0.2 times the rate, and then continue to discharge to 2.7V at a current of 0.2 times the rate, and repeat the charging Discharge cycle test.
[0049] The following table is the cycle performance parameters of different batteries assembled in Example 2:
[0050] Electrolyte serial number magnification discharge capacity Stable cycle times 1 0.2C 120mAh / g >140 tim...
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