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All-solid-state battery of skeleton supported alloy anode and preparation method thereof

An all-solid-state battery, alloy negative electrode technology, applied in battery electrodes, lithium storage batteries, secondary batteries, etc., can solve the problems of cycle performance deterioration, partial detachment of metal lithium negative electrodes, etc., to achieve good thermal stability, prevent circuit breaker, and cycle efficiency. high effect

Inactive Publication Date: 2016-04-06
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

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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  • All-solid-state battery of skeleton supported alloy anode and preparation method thereof
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  • All-solid-state battery of skeleton supported alloy anode and preparation method thereof

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preparation example Construction

[0026] The preparation method of the all-solid-state battery of the framework supporting the alloy negative electrode of the present invention comprises the following steps:

[0027] (1) Preparation of skeleton-supported alloy negative electrode: the alloy negative electrode material is Li-B alloy sheet, the solid electrolyte is Li-La-Zr-O solid electrolyte powder, the passivation layer film on the surface of the Li-B alloy electrode sheet is polished, and the Li-La-Zr-O solid electrolyte powder with a particle size of 30-300 microns, according to 0.1-1.5mg / cm 2 Spread evenly on the surface of the Li-B alloy electrode sheet, and then apply a pressure of 5-15MPa to press the powder on it to obtain an electrolyte-treated skeleton-supported alloy negative electrode material;

[0028] (2) Preparation of composite electrolyte: the molecular weight adopted by the organic component of the composite electrolyte is polyethylene glycol polymer PEO or plastic crystal organic substance su...

Embodiment 1

[0037] The preparation method of the all-solid-state battery of the present invention, the specific technical content is:

[0038] 1. Preparation of alloy negative electrode:

[0039] The alloy negative electrode material used is Li-B alloy sheet, and the solid electrolyte used is Li-La-Zr-O system.

[0040] Concrete preparation steps are as follows:

[0041] Cut the Li-B alloy electrode sheet with a diameter of 1.8cm, and polish off the passivation layer film on the surface;

[0042] Take 1 mg of Li-La-Zr-O solid electrolyte powder with a particle size of about 100 microns, and spread it on the surface of the Li-B alloy electrode sheet, and then apply a pressure of 10 MPa to press the powder on it to obtain electrolyte treatment Alloy anode materials;

[0043] 2. Preparation of composite electrolyte:

[0044] The organic component of the composite electrolyte uses PEO as a polymer with a molecular weight of 100,000. The solvent for dissolving PEO is THF, and the electroly...

Embodiment 2

[0061] The preparation method of the all-solid-state battery of the present invention, the specific technical content is:

[0062] 1. Preparation of alloy negative electrode:

[0063] The preparation method is the same as that of the alloy negative electrode material used in Example 1.

[0064] 2. Preparation of composite electrolyte:

[0065] The organic component of the composite electrolyte uses PEO as a polymer with a molecular weight of 100,000. The solvent for dissolving PEO is THF, and the electrolyte is LiTFSI. The inorganic component of the composite electrolyte is Li-Al-Ti-P powder with a particle size of less than 300 mesh.

[0066] Concrete preparation steps are as follows:

[0067] Weigh PEO and LiTFSI (the total mass is about 800 mg) according to the 8:1 ratio of EO segment and Li ion, and then dissolve them with THF as a solvent.

[0068] Weigh 625 mg of the prepared solution, then weigh 950 mg of Li-Al-Ti-P powder, mix and stir it evenly, and obtain the slur...

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Abstract

The invention discloses an all-solid-state battery of a skeleton supported alloy anode and a preparation method thereof. The skeleton supported alloy anode material is higher in heat stability relative to metallic lithium; and moreover, after the treatment of a small amount of added inorganic solid electrolyte powder, when free Li in the gaps of lithium borate compound (Li7B6) particles on the surface layer of the alloy anode material is completely consumed, the transfer path of lithium ions can be maintained continuously because of the existence of the lithium ion conductor, and the disconnection problem of the transfer path of the lithium ions appearing between the anode and the electrolyte in the charging and discharging process of the all-solid-state battery is prevented. The skeleton supported alloy anode material is applied to the all-solid-state battery system, and a metallic lithium dead level on the anode side of the all-solid-state battery can be solved, so that the all-solid-state battery has the advantages of good cyclicity and high cycle efficiency (100%), and is extremely suitable for being applied to large-capacity all-solid-state batteries.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to an all-solid-state battery with an alloy negative electrode supported by a skeleton and a preparation method thereof. Background technique [0002] At present, in lithium-ion batteries, due to the large amount of flammable and volatile organic liquid electrolytes such as esters and ethers, lithium-ion batteries are inherently unsafe. When the battery is abused, the heat of the battery will rise sharply in an instant, and the electrolyte will volatilize in large quantities, causing the battery to swell, or the heat accumulation will reach the ignition point of these organic solvents, causing accidents such as fire and explosion of the battery. In order to further improve the safety performance of lithium-ion batteries and solve the safety problems of liquid leakage, flatulence, combustion and explosion in special cases in conventional lithium battery sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M10/056H01M10/052
CPCH01M4/134H01M4/1395H01M10/052H01M10/056Y02E60/10
Inventor 钟海丁飞王春花徐志彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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