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All-solid-state lithium battery and preparation method thereof

A lithium battery, all-solid-state technology, used in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of deterioration of cycle performance, partial detachment of metal lithium negative electrodes, etc., to improve capacity density and safety performance, small size. Effects of interfacial resistance, excellent lithium dendrite suppression ability

Active Publication Date: 2020-10-16
安徽迅启新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that although this method can achieve fewer cycles of all-solid-state batteries, when the all-solid-state battery needs to be cycled for dozens of cycles, the capacity decay will become very obvious
Moreover, after the cycle performance deteriorates, it is very likely that the metal lithium negative electrode will fall off from the solid electrolyte side when the battery is disassembled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The invention provides a preparation method of an all-solid-state lithium battery, comprising the following steps:

[0033] (1) Preparation of negative electrode sheet: coating the negative electrode slurry on the negative electrode current collector and removing the solvent; wherein, the negative electrode slurry contains negative electrode material and solvent, and the negative electrode material contains negative electrode active material Materials, Li-La-Zr-O solid electrolyte and polyalkenyl carbonate;

[0034] (2) Preparation of composite electrolyte:

[0035] Utilize the mixed reaction of polyether diol, 2,6-toluene diisocyanate, catalyst and chain extender to obtain polyurethane prepolymer;

[0036] In an inert gas atmosphere, the lithium salt and inorganic solid electrolyte are dispersed into 1,3-dioxolane, and then a certain amount of initiator and plasticizer are added, and the precursor solution is prepared after uniform dispersion;

[0037] (3) Assembly o...

Embodiment 1

[0056] A preparation method of an all-solid-state lithium battery:

[0057] (1) Preparation of negative electrode sheet:

[0058] Disperse negative electrode active material graphite, Li-La-Zr-O solid electrolyte (particle size: 120 μm) and polypropylene carbonate (molecular weight: 200,000) into solvent anisole, and mix uniformly to form negative electrode slurry. The negative electrode active material The mass ratio of graphite, Li-La-Zr-O solid electrolyte and polycarbonate is 65:35:4;

[0059] Evenly coat the negative electrode slurry on the copper foil of the negative electrode current collector, and the coating thickness is 200 μm; in a vacuum drying oven, control the temperature at 50 ° C, dry, and then add the surface of the negative electrode current collector coated with the negative electrode slurry The pressure was raised to 3 MPa, the temperature was raised to 230° C., and kept for 10 minutes to obtain the negative electrode sheet.

[0060] (2) Preparation of co...

Embodiment 2

[0072] A preparation method of an all-solid-state lithium battery:

[0073] (1) Preparation of negative electrode sheet:

[0074] Disperse negative electrode active material graphite, Li-La-Zr-O solid electrolyte (particle size: 120 μm) and polypropylene carbonate (molecular weight: 200,000) into solvent anisole, and mix uniformly to form negative electrode slurry. The negative electrode active material The mass ratio of graphite, Li-La-Zr-O solid electrolyte and polycarbonate is 60:30:1;

[0075] Evenly coat the negative electrode slurry on the copper foil of the negative electrode current collector, and the coating thickness is 200 μm; in a vacuum drying oven, control the temperature at 50 ° C, dry, and then add the surface of the negative electrode current collector coated with the negative electrode slurry The pressure was raised to 3 MPa, the temperature was raised to 230° C., and kept for 10 minutes to obtain the negative electrode sheet.

[0076] (2) Preparation of co...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to an all-solid-state lithium battery and a preparation method thereof, and the method comprises the following steps: (1) preparing a negative electrode plate; (2) preparing a composite electrolyte; (3) adding a precursor solution into the polyurethane prepolymer prepared in the step (2), performing uniformstirring and mixing, and uniformly smearing the mixture on the surface of the negative electrode plate prepared in the step (1), performing drying at the temperature of 70-75 DEG C, keeping the temperature for 6-8 hours, pressing and leveling the dried negative electrode plate covered with the composite electrolyte under the pressure of 5-20MPa, covering the composite electrolyte with the positive electrode plate, and performing assembling to obtain the all-solid-state battery. The all-solid-state battery provided by the invention can ensure that the interface resistance is smaller and the lithium dendritic crystal inhibition capability is excellent in the charging and discharging process, so the capacity density and the safety performance of the all-solid-state battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and particularly relates to an all-solid-state lithium battery and a preparation method thereof. Background technique [0002] Generally speaking, lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes, structural shells, etc., wherein the electrolytes enable current to be conducted in the form of ions inside the battery. Electrolyte technology can be said to be one of the core technologies of lithium batteries and a highly profitable part of the modern battery industry. Existing lithium-ion batteries will swell after being used for a long time, and in more extreme small-probability events, some may even be in danger of explosion. In addition, the operating temperature range of the existing lithium-ion battery is limited, and the service life will be shortened sharply at a high temperature above 40°C, and the safety performance w...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0585H01M10/0525H01M10/0565
CPCH01M10/058H01M10/0585H01M10/0525H01M10/0565H01M2300/0085Y02E60/10Y02P70/50
Inventor 徐球白国梁王春花储宁平储昭虎
Owner 安徽迅启新能源科技有限公司