An in-situ polymerized polycaprolactone-based all-solid-state electrolyte and its preparation method and application

An in-situ polymerization, polycaprolactone technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as low ionic conductivity, achieve improved ionic conductivity, wide electrochemical stability window, and improve cycle stability. performance and service life

Active Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low ionic conductivity of the current polycaprolactone-based solid-state electrolyte, and provide an in-situ polymerized polycaprolactone-based all-solid-state electrolyte and its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of in-situ polymerized polycaprolactone-based all-solid-state electrolyte includes the following steps:

[0035] Step 1, in an argon glove box, add methoxy polycaprolactone acrylate, lithium bisfluorosulfonimide and halloysite inorganic particles into a glass bottle according to the mass of 1g, 0.30g and 0.05g. Stir for 6 hours to completely dissolve the solid to obtain a uniform mixed liquid;

[0036] Step 2, in an argon glove box, add 0.02g of 2-hydroxy-2-methyl-1 phenylacetone to the uniformly mixed liquid described in step 1, stir for 2 hours under light-proof conditions, and stir evenly to obtain a mixture ;

[0037] Step 3: In an argon glove box, using the preparation method of in-situ polymerization, the mixture prepared in step 2 is directly coated on a stainless steel sheet, irradiated under a 120W UV lamp for 10 min, and subjected to radical polymerization to obtain in-situ polymerization. Polycaprolactone based solid electrolyte.

[0038] T...

Embodiment 2

[0041] The preparation of in-situ polymerized polycaprolactone-based all-solid-state electrolyte includes the following steps:

[0042] Step 1, in an argon glove box, add methoxypolycaprolactone acrylate and lithium bisfluorosulfonimide by mass 1g and 0.10g into a glass bottle, fully stir for 5 hours to completely dissolve the solid, and obtain evenly mix the liquid;

[0043] Step 2, in an argon glove box, add 0.01 g of 2-hydroxy-2-methyl-1 phenylacetone to the uniformly mixed liquid described in step 1, stir for 1 hour under light-proof conditions, stir evenly, and obtain mixture;

[0044] In step 3, in an argon gas glove box, using the preparation method of in-situ polymerization, the liquid obtained in step 2 is directly coated on a stainless steel sheet, and irradiated under a 120W ultraviolet lamp for 20 minutes to carry out a radical polymerization reaction to obtain in-situ polymerization. Polycaprolactone based solid electrolyte.

[0045] The obtained in-situ polyme...

Embodiment 3

[0048] The preparation of in-situ polymerized polycaprolactone-based all-solid-state electrolyte includes the following steps:

[0049] Step 1, in an argon glove box, add methoxypolycaprolactone acrylate, lithium bisfluorosulfonimide and halloysite inorganic particles into a glass bottle by mass 1g, 0.30g, 0.02g, fully Stir for 6 hours to completely dissolve the solid to obtain a uniform mixed liquid;

[0050] Step 2, in an argon glove box, add 0.02 g of 2-hydroxy-2-methyl-1 phenylacetone to the uniformly mixed liquid described in step 1, stir for 1 hour under light-proof conditions, and stir evenly to obtain a mixture ;

[0051] In step 3, in an argon gas glove box, using the preparation method of in-situ polymerization, the liquid obtained in step 2 is directly coated on a stainless steel sheet, irradiated under a 120W ultraviolet lamp for 120 minutes, and free radical polymerization is carried out to obtain in-situ polymerization. Polycaprolactone based solid electrolyte....

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Abstract

The invention discloses an in-situ polymerized polycaprolactone-based all-solid electrolyte as well as a preparation method and application thereof. The method comprises: adding lithium salt and inorganic additive particles into methoxy polycaprolactone acrylate to obtain a mixed liquid; adding a photoinitiator into the mixed liquid and mixing evenly to obtain a mixture; under an inert atmosphere, coating the mixture Covering on the pole piece, the in-situ polymerization reaction is carried out under the irradiation of ultraviolet light to obtain the in-situ polymerization polycaprolactone-based all-solid-state electrolyte. The branched structure of the all-solid-state electrolyte of the present invention and its combination with polymer material particles make it have high mechanical strength, high ion conductivity, high ion transfer number and wide electrochemical window, and has a certain biological Degradability. The all-solid-state electrolyte of the present invention uses an in-situ polymerization preparation method. The precursor is directly coated on the pole piece, and the solid-state electrolyte is obtained by free radical polymerization under ultraviolet light triggering. The process conditions are simple, efficient and convenient, and there is no solvation and no pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium ion batteries, in particular to an in-situ polymerized polycaprolactone-based all-solid-state electrolyte and a preparation method and application thereof. Background technique [0002] In 1991, Sony first used lithium-ion batteries as an energy storage system in small cameras. Compared with other batteries, lithium-ion batteries, such as nickel-hydrogen batteries, lead-acid batteries, nickel-chromium batteries, etc., have various advantages such as high voltage, large specific energy, long cycle life, small self-discharge effect, and fast charge and discharge. Standing out in the battery market, lithium-ion batteries are gradually widely used in small devices such as smartphones, cameras, intelligent robots, drones, and have unlimited potential in the field of electric vehicles. Since the development of lithium-ion batteries, their energy density has not been able to exceed 260 W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 王朝阳叶维徐洪礼邓永红
Owner SOUTH CHINA UNIV OF TECH
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