Preparation method for solid-state lithium-ion battery

A lithium-ion battery, solid electrolyte technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of long cycle, large battery polarization resistance, low production efficiency, etc.

Inactive Publication Date: 2018-06-01
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this method is: the utilization rate of target material is not high, needs large-scale instrument to carry out magnetron sputtering, and cost is too high
The problem with this method is that the process of obtaining solid electrolyte sheets by traditional tablet molding technology is cumbersome and complicated, and the cost is high and the cycle is long. The physical contact achieved by extrusion, the battery

Method used

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Examples

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preparation example Construction

[0016] The invention provides a method for preparing a solid-state lithium ion battery, the method comprising the steps of:

[0017] Step 1. Disperse the solid electrolyte in a solvent to obtain a solid electrolyte solution, wherein the mass ratio of the solid electrolyte to the solvent is 1:5-50;

[0018] Step 2, select the ternary material as the positive electrode of the solid-state lithium ion battery, and metal lithium as the negative electrode;

[0019] Step 3: adding a film-forming agent to the solid electrolyte solution, coating the surfaces of the positive and negative electrodes, drying, and sintering the positive electrode coated with the solid electrolyte at 800°C-1000°C, keeping it warm for 2-10 hours, cooling, wherein the film-forming agent is polyvinylidene fluoride, polytetrafluoroethylene or polyvinyl alcohol, and the molar ratio of the film-forming agent to the solid electrolyte is 1:20 to 30;

[0020] Step 4, assembling the cooled positive electrode materia...

Embodiment 1

[0028] 1. Synthesize solid electrolyte powder by solid phase synthesis method, take 10g Li 5 La 3 Ta 2 o 12 Dissolve in 50 g of N-methylpyrrolidone for dispersion to obtain a solid electrolyte solution with uniform dispersion and no powder.

[0029] 2. Add 1g of polyvinylidene fluoride to the solid electrolyte solution, stir evenly, spin-coat on the surface of the block lithium iron phosphate material and block metal lithium, and dry it.

[0030] 3. Put the lithium iron phosphate material coated with solid electrolyte in the muffle furnace, control the temperature rise rate to 2°C / min, raise the temperature of the muffle furnace to 800°C, keep it warm for 2 hours, and cool with the furnace. Take out and set aside.

[0031] 4. The positive electrode material prepared in step 3 and the negative electrode material prepared in step 2 are assembled into a solid-state lithium ion battery.

Embodiment 2

[0033] 1. Synthesize solid electrolyte powder by solid phase synthesis method, take 10g Li 5 La 3 Ta 2 o 12 Dissolve in 100g of N-methylpyrrolidone for dispersion to obtain a solid electrolyte solution with uniform dispersion and no powder.

[0034] 2. Add 0.5g of polyvinylidene fluoride to the solid electrolyte solution, stir evenly, spin-coat on the surface of bulk lithium iron phosphate material and bulk metal lithium, and dry.

[0035] 3. Put the lithium iron phosphate material coated with solid electrolyte in the muffle furnace, control the temperature rise rate to 2°C / min, raise the temperature of the muffle furnace to 800°C, keep it warm for 2 hours, and cool with the furnace. Take out and set aside.

[0036] 4. The positive electrode material prepared in step 3 and the negative electrode material prepared in step 2 are assembled into a solid-state lithium ion battery.

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Abstract

Embodiments of the invention provide a preparation method for a solid-state lithium-ion battery, belonging to the technical field of battery preparation. The preparation method comprises the followingsteps: dispersing a solid electrolyte in a solvent so as to obtain a solid electrolyte solution, wherein a mass ratio of the solid electrolyte to the solvent is 1: (5-50); selecting a three-componentmaterial as a positive electrode of the solid-state lithium-ion battery and using lithium metal as a negative electrode of the solid-state lithium-ion battery; adding a film forming agent into the solid electrolyte solution, coating the surfaces of the positive electrode and the negative electrode with the solid electrolyte solution, carrying out drying, then sintering the positive electrode coated with the solid electrolyte solution at a temperature of 800 to 1000 DEG C, maintaining the positive electrode at the temperature for 2 to 10 h and then carrying out cooling, wherein the film forming agent is polyvinylidene fluoride, polytetrafluoroethylene or polyvinyl alcohol, and a mass ratio of the film forming agent to the solid electrolyte is 1: (10-20); and assembling the cooled positiveelectrode and the negative electrode coated with the solid electrolyte solution so as to obtain the solid-state lithium-ion battery. The preparation method for the solid-state lithium-ion battery is simple in process, and low in energy consumption and cost.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a preparation method of a solid-state lithium ion battery. Background technique [0002] Energy and the environment are the basic conditions for the survival and development of human society, an important material basis for national construction and economic development, and two contradictory problems facing the world today. With the continuous consumption of traditional non-renewable energy and the deteriorating global environment, it is imminent to develop and utilize new green energy. Solar energy, wind energy, ocean energy, nuclear energy, biomass energy and hydrogen energy are all new energy sources that have developed rapidly in recent years, and they all play an important role in various fields of our daily life. However, in order to further improve energy utilization efficiency, it is necessary to better realize energy storage and transformation. ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0562H01M10/0565
CPCH01M10/0562H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 符显珠胡志雄孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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