In-situ polymerization polycaprolactone-based all-solid-state electrolyte as well as preparation method and application thereof

An in-situ polymerization and polycaprolactone technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of low ionic conductivity, achieve high ionic conductivity, inhibit the growth of lithium dendrites, and improve cycle stability The effect of performance and service life

Active Publication Date: 2020-07-17
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 comprises the following steps:

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

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

[0037] Step 3: In an argon glove box, use the preparation method of in-situ polymerization to directly coat the mixture prepared in step 2 on a stainless steel sheet, and irradiate it under a 120W ultraviolet lamp for 10 minutes to perform free radical polymerization to obtain in-situ polymerization Polycaprolactone-based solid ele...

Embodiment 2

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

[0042] Step 1, in an argon glove box, add methoxypolycaprolactone acrylate and lithium bisfluorosulfonyl imide into a glass bottle according to the mass of 1g and 0.10g, stir well for 5 hours to completely dissolve the solid, and obtain Mix the liquid evenly;

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

[0044] Step 3: In an argon glove box, the preparation method of in-situ polymerization is used to directly coat the liquid prepared in step 2 on a stainless steel sheet, and irradiate it under a 120W ultraviolet lamp for 20 minutes to perform free radical polymerization to obtain in-situ polymerization Polycaprolactone-based solid electrolyte.

[0045] The prepared in-situ po...

Embodiment 3

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

[0049] Step 1, in an argon glove box, add methoxy polycaprolactone acrylate, lithium bisfluorosulfonyl imide and halloysite inorganic particles into glass bottles according to the mass of 1g, 0.30g, 0.02g, and fully Stir for 6 hours to completely dissolve the solid and obtain a homogeneous mixed liquid;

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

[0051] Step 3: In an argon glove box, use the preparation method of in-situ polymerization to directly coat the liquid obtained in step 2 on a stainless steel sheet, and irradiate it under a 120W ultraviolet lamp for 120 minutes to perform free radical polymerization to obtain in-situ polymerization Polycaprolactone-based solid e...

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Abstract

The invention discloses an in-situ polymerization polycaprolactone-based all-solid-state electrolyte as well as a preparation method and application thereof. The method comprises the following steps of adding lithium salt and inorganic additive particles into methoxy polycaprolactone acrylate to obtain a mixed solution; adding a photoinitiator into the mixed solution, and uniformly mixing to obtain a mixture; and coating a pole piece with the mixture in an inert atmosphere, and carrying out in-situ polymerization reaction under the irradiation of an ultraviolet lamp to obtain the in-situ polymerization polycaprolactone-based all-solid-state electrolyte. The branched structure of the all-solid-state electrolyte is compounded with the polymer material particles, so that the all-solid-state electrolyte has high mechanical strength, high ionic conductivity, high ionic migration number and wide electrochemical window, and has certain biodegradability. According to the all-solid-state electrolyte, an in-situ polymerization preparation method is adopted, the pole piece is directly coated with a precursor, and the free radical polymerization is carried out under the initiation of the ultraviolet light to obtain the solid-state electrolyte, so that the technological conditions are simple, the high efficiency and convenience are achieved, the solvation is avoided, and no pollution is caused 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 its preparation method and application. Background technique [0002] In 1991, Sony first applied lithium-ion batteries as an energy storage system to compact cameras. Compared with other batteries, such as hydrogen-nickel batteries, lead-acid batteries, nickel-chromium batteries, etc., lithium-ion batteries have various advantages such as high voltage, large specific energy, long cycle life, small self-discharge effect, and fast charge and discharge. Stand out in the battery market, therefore, lithium-ion batteries are gradually widely used in small devices such as smartphones, cameras, smart robots, drones, etc., and have unlimited potential in the field of electric vehicles. Since the development of lithium-ion batteries, its energy density has been unable to break thro...

Claims

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Application Information

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Patent Type & Authority Applications(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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