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Electrolyte with self-repairing function and preparation method of solid-state battery

A technology of solid-state batteries and composite electrolytes, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve problems such as thermal runaway, reduced energy storage and release stability, and shortened device life

Pending Publication Date: 2020-04-17
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems seriously reduce the stability of energy storage and release, shorten the service life of the device, and even cause safety problems such as thermal runaway

Method used

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  • Electrolyte with self-repairing function and preparation method of solid-state battery
  • Electrolyte with self-repairing function and preparation method of solid-state battery
  • Electrolyte with self-repairing function and preparation method of solid-state battery

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preparation example Construction

[0028] The invention discloses a method for preparing an electrolyte with a self-repairing function and a solid-state battery, comprising the following steps:

[0029] Step 1. Dissolve vinyltriethoxysilane (VTES) in deionized water, ultrasonically hydrolyze it completely, add ammonia water drop by drop, form a gel, separate, purify and dry to obtain the solid product vinyl functionalized dioxide Silicon, which acts as a cross-linking active site;

[0030] Step 2, blending and dissolving vinyl functionalized silica, self-repairing functionalized group compound, ion-conducting group compound, initiator, inorganic conductive ceramics and lithium salt in a solvent according to the proportion, fully dispersing and mixing to obtain Precursor solution; the precursor solution is cast into a film, reacted at a certain temperature, and then dried to obtain a self-healing functional composite electrolyte;

[0031] Step 3, the self-repairing functional composite electrolyte is matched wi...

Embodiment 1

[0047] (1) Preparation of vinyl functionalized silica

[0048] Add 4g of vinyltriethoxysilane to 32g of deionized water and stir continuously for 48 hours until the small droplets of triethoxymethylsilane completely disappear, then add 4ml of ammonia water with a concentration of 25% to the above solution dropwise , continuously stirred for 24 hours until the sol-gel reaction was complete. Use a high-speed centrifuge to centrifuge to obtain white powdery particles, then wash with ethanol several times to remove residual precursors and impurities, and finally dry the obtained white powder in a vacuum oven at 50°C to obtain vinyl Functionalized silica for later use.

[0049] (2) Preparation of hydrogen-bonded self-healing composite electrolyte and solid-state battery

[0050] Add 2 g of 6-methylisocytosine into 50 ml of DMSO, and stir at 150° C. for 10 minutes. The solution was cooled to room temperature, 2.64 g of methyl 2-isocyanate methacrylate was added to the above solut...

Embodiment 2

[0053] (1) Preparation of vinyl functionalized silica

[0054] Add 3g of vinyltriethoxysilane to 25g of deionized water and stir continuously for 48h until the small droplets of triethoxymethylsilane completely disappear, then add 5ml of ammonia water with a concentration of 25% to the above solution dropwise , continuously stirred for 24 hours until the sol-gel reaction was complete. Use a high-speed centrifuge to centrifuge to obtain white powdery particles, then wash with ethanol several times to remove residual precursors and impurities, and finally dry the obtained white powder in a vacuum oven at 50°C to obtain vinyl Functionalized silica for later use.

[0055] (2) Preparation of hydrogen-bonded self-healing composite electrolyte and solid-state battery

[0056] 0.8g of vinyl-functionalized silica, 8g of acrylic acid, 1g of LLTZO, 1g of LiFSI, and 0.01g of AIBN were magnetically stirred at room temperature, mixed evenly, cast into a film, and then reacted at 60°C for ...

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Abstract

The invention belongs to the technical field of chemical power supplies, and particularly relates to an electrolyte with a self-repairing function and a preparation method of a solid-state battery. The preparation method comprises the following steps: 1, dissolving vinyltriethoxysilane in deionized water for hydrolysis, adding ammonia water to form gel, and separating, purifying and drying to obtain a solid product vinyl functionalized silicon dioxide; 2, dissolving vinyl functionalized silicon dioxide, a self-repairing functionalized group compound, an ionic conductive group compound, an initiator, inorganic conductive ceramic and a lithium salt in a solvent in proportion, fully dispersing and mixing to obtain a precursor solution, casting to form a film, reacting at a certain temperature, and performing drying to obtain the self-repairing functional composite electrolyte; and 3, matching the self-repairing functional composite electrolyte with a positive electrode and a negative electrode to prepare the solid-state battery. According to the invention, the self-repairing functional electrolyte with good mechanical strength and the solid-state battery with stable output can be obtained.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a preparation method of an electrolyte with a self-repairing function and a solid-state battery. Background technique [0002] The key materials of electrochemical energy storage devices will have irreversible mechanical damage such as local cracks and ruptures during use. Especially in extreme conditions or special applications such as wearable devices, multiple bending and deformation processes make it easier to Physical damage occurs. These problems seriously reduce the stability of energy storage and release, shorten the service life of the device, and even cause safety problems such as thermal runaway. Therefore, it is urgent to develop energy storage devices with self-healing functions, minimize the performance loss caused by equipment damage, and fundamentally achieve high safety, high reliability, and long-life energy storage. [0003] Self-he...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/052H01M10/058
CPCH01M10/056H01M10/052H01M10/058H01M2300/0065Y02E60/10Y02P70/50
Inventor 李杨刘梓洋赵冬梅丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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