Gel electrolyte diaphragm treatment method

A technology of gel electrolyte and processing method, which is applied in the field of preparation of in-situ gel electrolyte inside the battery, can solve the problems of complex preparation method, complicated manufacturing process, and harsh gelation conditions, and achieve simple preparation method, easy-to-obtain raw materials, Effects that are easy to store

Pending Publication Date: 2022-02-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current preparation methods of gel electrolytes are relatively complicated, and the formation of many gel materials requires specific conditions.
CN102670567 A discloses a method for preparing a flame-retardant gel electrolyte. The prepared non-aqueous gel electrolyte needs to trigger a polymerization reaction under high temperature conditions to prepare the gel electrolyte. The manufacturing process is complicated and time-consuming; CN 113258131 A A preparation method of a gel polymer electrolyte is disclosed, which requires standing at 60°C for 24 hours to form a gel electrolyte; CN 113270641 A prepares a gel electrolyte under the condition of ultraviolet light irradiation, this method is relatively complicated, and the cost is Glue conditions are more stringent
(DOI: 10.1126 / sciadv.aat5383) It is pointed out that the ring-opening polymerization of 1,3-dioxane was initiated by lithium salt with a concentration of 2 moles per liter, and a gel electrolyte was prepared. Doubles the cost, so the selection of a non-lithium salt, low concentration, and cheap initiator is a necessary condition for commercial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) ethylene glycol dimethyl ether and boron trifluoride ether solvent are mixed according to volume ratio 10:1 to obtain a prefabricated solution with an initiator;

[0038] 2) After coating the prefabricated solution on one side of the common polypropylene separator, after the DME is volatilized, the battery is assembled; wherein, 7.06 ml of the prefabricated solution is applied per square centimeter of the separator;

[0039] 3) Configure the electrolyte, the solvent is 1,3-dioxane and ethylene glycol dimethyl ether, the volume ratio of the two is 1,3-dioxane:ethylene glycol dimethyl ether=7:3, and the solute is lithium salt LiTFSI and LiNO 3 , 1M (mol / L) LiTFSI, 0.1M LiNO 3 ;

[0040] 4) drip electrolyte to the diaphragm obtained in the 2) step, assemble into a battery together with the positive electrode and the negative electrode, the side of the diaphragm with an initiating Lewis acid on the surface faces the positive electrode, and 3.09 microliters of steps are...

Embodiment 2

[0051] The other steps are the same as in Example 1, except that, in step 2), the position of changing the prefabricated solution of boron trifluoride to treat the diaphragm is to treat the diaphragm on both sides. In situ gelation of the electrolyte is induced after treatment. The other steps of the comparative sample are the same as those of Comparative Example 1.

[0052] Applied in the lithium-sulfur battery system under the current of 0.5C (1C=1675mAh / g), the capacity of the gel electrolyte battery formed by in-situ gelation of the separator with initiating Lewis acid on both sides after 100 cycles of stable cycling Attenuate from 990 mAh / g to about 700 mAh / g, drop 3.09 microliters of the electrolyte obtained in step 3) of Example 1 on both sides of the diaphragm per square centimeter surface, and the capacity of the ordinary liquid electrolyte is reduced from 1000 mAh compared to the same period last year. / g decays to around 450mAh / g,

[0053] The amount of electrolyt...

Embodiment 3

[0055] The other steps are the same as in Example 1, the difference is that in step 5) the positive electrode sulfur loading is 2.5 mg / cm 2 , and the separator is applied at a current of 0.5C (1C=1675 mAh / g) with an initiating Lewis acid on the surface. The amount of gel electrolyte formed by in-situ gelation is still 3.09 μl / cm 2 , except that the positive electrode material is the step 5 of Example 1) The positive electrode sulfur loading is 2.5 mg / cm 2 , and other conditions are the same as in Comparative Example 1. In the lithium-sulfur battery system, the battery system formed by in-situ gelation of the separator treated with Lewis acid as the electrolyte has a stable capacity of 1300 mAh / g after 100 cycles attenuates to about 600 mAh / g, which is comparable to that of ordinary liquid electrolyte batteries. The capacity of the system has been maintained at about 400 mAh / g, which does not have practical application value. Therefore, the amount of gel electrolyte formed by in...

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Abstract

The invention relates to a gel electrolyte diaphragm treatment method. The method comprises the following steps of: adding an initiator into an organic solvent, and mixing them to obtain a prefabricated solution; coating the surface of a diaphragm with the prefabricated solution obtained in the previous step, and standing for 0.1-10 days to obtain a diaphragm with an initiator; and dropwise adding an electrolyte on the surface of the diaphragm with the initiator obtained in the previous step, and standing for 0.1-10 days to form a polymer gel electrolyte in situ, thereby acquiring the battery diaphragm, wherein the initiator is Lewis acid. The gel electrolyte diaphragm treatment method is simple, low in cost, practical and effective.

Description

technical field [0001] The invention relates to a method for treating a gel electrolyte and its application, more particularly, to a method for preparing an in-situ gel electrolyte inside a battery and its application in the battery, belonging to the related field of secondary batteries. Background technique [0002] In recent years, new secondary batteries such as lithium-ion and sodium-ion batteries have become more and more common in people's production and life. The battery of gel polymer electrolyte system meets people's needs for high energy density, safety and flexible devices. However, the preparation methods of current gel electrolytes are mostly complicated, and the formation of many gel materials requires specific conditions. CN102670567 A discloses a preparation method of a flame-retardant gel electrolyte. The prepared non-aqueous gel electrolyte needs to initiate a polymerization reaction under high temperature conditions to prepare a gel electrolyte, and the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M50/403
CPCH01M10/0565H01M50/403Y02E60/10
Inventor 刘喜正耿慧丁轶
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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