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A kind of preparation method of all-solid-state battery

An all-solid-state battery and solid-state electrolyte technology, applied in the manufacture of electrolyte batteries, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as loss of lithium elements, inability to meet the demand for electricity, increase interface impedance, and reduce contact gaps. , The effect of reducing the internal resistance of the interface and good circulation

Active Publication Date: 2021-01-15
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a preparation method of an all-solid-state battery, which aims to solve the problem that increasing the sintering temperature in the existing industry will lead to the loss of lithium elements, and cause mutual diffusion between active materials and electrolytes, and generate impurity phases at the interface, thereby increasing the The problem of interface impedance and the problem of making the electrolyte into a thin film cannot meet the demand for electricity

Method used

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Examples

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preparation example Construction

[0013] The preparation method of the all-solid-state battery provided in the embodiment of the present invention, the method includes:

[0014] Step 1. Press solid electrolyte powder into electrolyte sheet;

[0015] Step 2. Mix lithium cobaltate, polyvinylidene fluoride, carbon nanotubes and N-methyl-2-pyrrolidone according to the mass ratio of 40~55:9~12:8~9:6~8, and prepare a mixed solution ;

[0016] Step 3, mix the solution according to 0.1 ~ 0.5mg / cm 2 Drop the amount of the electrolyte sheet on the surface of the electrolyte sheet, dry it, spray gold on the surface of the electrolyte sheet, and sinter at 700-800°C for 0.5-2 hours to obtain the target electrolyte sheet;

[0017] Step 4, using the target electrolyte sheet to assemble the battery.

[0018] The preparation method of an all-solid-state battery provided by the present invention, by spraying gold on the surface of the electrolyte, the gold film of the cathode material is well covered on the surface of the el...

Embodiment 1

[0030] Mix and grind lithium carbonate, lanthanum oxide, and titanium dioxide at a mass ratio of 0.275:0.25:1 for 1 hour, add ethanol, ultrasonically, dry at 120°C for 2 hours, place in a muffle furnace, and raise the temperature to 800°C at a rate of 2°C / min Pre-burn for 2h.

[0031] Take out the mixture and grind it for 1 hour, take 1g and press it into an electrolyte sheet under a pressure of 18MPa, bake it at 1100°C to form a lanthanum lithium titanate electrolyte sheet, and polish it to make an electrolyte with a thickness of 0.2mm and a diameter of 1.5cm piece.

[0032] Mix commercial lithium cobaltate, polyvinylidene fluoride (PVDF), carbon nanotube (CNT), and N-methyl-2-pyrrolidone (NMP) at a mass ratio of 45:10:9:6, stir and sonicate for 2 hours each , and use a pipette to press 0.2mg / cm 2 Aspirate the solution and drop it onto the electrolyte sheet. Dry at a temperature of 120° C., and set the current of the magnetron sputtering apparatus to 50 mA for 120 s, and s...

Embodiment 2

[0035] Mix and grind lithium iron phosphate, lanthanum oxide, and titanium dioxide at a mass ratio of 0.2:0.3:0.8 for 1 hour, add ethanol, ultrasonically, dry at 100°C for 2 hours, place in a muffle furnace, and raise the temperature to 900°C at a rate of 5°C / min. Pre-burn at ℃ for 3h.

[0036] Take out the mixture and grind it for 1 hour, take 0.6g and press it into an electrolyte sheet under a pressure of 18MPa, bake it at a temperature of 1150°C to form a lanthanum lithium titanate electrolyte sheet, and polish it to make a 0.2mm thick and 1.5cm diameter Electrolyte sheet.

[0037] Mix commercial lithium cobaltate, polyvinylidene fluoride (PVDF), carbon nanotube (CNT), N-methyl-2-pyrrolidone (NMP) in a mass ratio of 55:12:8:8, stir and sonicate for 2 hours each , and use a pipette to press 0.5mg / cm 2 Aspirate the solution and drop it onto the electrolyte sheet. Dry at a temperature of 100° C., and set the current of the magnetron sputtering apparatus to 50 mA for 130 s, ...

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Abstract

An embodiment of the present invention provides a method for preparing an all-solid-state battery, which relates to the technical field of batteries. The method comprises: pressing the solid electrolyte powder into an electrolyte sheet, mixing lithium cobaltate, polyvinylidene fluoride, carbon nanotubes and N-methyl-2-pyrrolidone in a mass ratio of 40:9:8:6, and configuring the Mixed solution, the mixed solution according to 0.1mg / cm 2 The amount of the electrolyte sheet was dropped on the surface of the electrolyte sheet, dried, sprayed gold on the surface of the electrolyte sheet, and sintered at 700°C for 0.5h to obtain the target electrolyte sheet, and assembled the battery with the target electrolyte sheet. By covering the cathode material gold film on the surface of the electrolyte, and then heat treatment, the contact gap between the active material and the electrolyte in the assembled battery can be greatly reduced, and the discharge of organic matter in the battery can reduce the internal resistance of the interface and avoid falling off. problems, improving the energy density and cycle stability of all-solid-state batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of an all-solid-state battery. Background technique [0002] With the improvement of my country's scientific and technological level, the battery industry is developing more and more rapidly, such as the lithium battery industry. [0003] Compared with traditional liquid lithium-ion batteries, all-solid-state lithium batteries are widely used because they can effectively inhibit the generation of lithium dendrites and improve the safety performance of batteries. However, the solid-solid interface between the solid-state electrolyte and electrodes is crucial to achieve electrochemical performance. [0004] At present, the solid electrolyte is mainly a perovskite oxide electrolyte (lanthanum lithium titanate, Li0.5La0.5TiO3), which has a high room temperature conductivity, but it has a high interface resistance with the active material. This bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/052
CPCH01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 符显珠盛家利康佳慧谢金麒孙蓉
Owner SHENZHEN INST OF ADVANCED TECH
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