All-solid-state battery and preparation method thereof

An all-solid-state battery, electrolyte layer technology, applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems of chemical stability, capacity and cycle stability, etc., to improve ion conductivity and reduce resistance. , the effect of strong design

Active Publication Date: 2021-06-22
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, the present invention provides an all-solid-state battery, which can solve the problems of poor electrochemical stability, capacity and cycle stability of solid-state batteries containing ionic liquids

Method used

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  • All-solid-state battery and preparation method thereof
  • All-solid-state battery and preparation method thereof
  • All-solid-state battery and preparation method thereof

Examples

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preparation example Construction

[0038] The raw materials for the preparation of the multifunctional intermediate layer include polymers, ionic liquid monomers, initiators and solvents;

[0039] The ionic liquid monomer contains at least one unsaturated carbon-carbon double bond;

[0040] The cation of the ionic liquid monomer is selected from one or more combinations of piperidinium cations, quaternary ammonium salt cations and pyrrole cations.

[0041] Preferably, the preparation method of the multifunctional intermediate layer comprises the following steps:

[0042] Mix high molecular polymer, ionic liquid monomer, initiator and solvent to prepare multifunctional interlayer slurry;

[0043] Polymerized by heating, then dried.

[0044] Preferably, the heating polymerization temperature is 50-100°C.

[0045] It can be understood that the drying can be vacuum drying or heating vacuum drying, the purpose is to remove the solvent. Preferably, the temperature of heating and vacuum drying is 50-100°C, and the t...

Embodiment 1

[0078] This embodiment provides an all-solid-state battery and its preparation method, the preparation method is as follows:

[0079] (1) First configure the organic-inorganic composite electrolyte layer slurry, the composition of the organic-inorganic composite electrolyte layer slurry is polyacrylonitrile with a molecular weight of 600,000, Li 7 La 3 Zr 2 o 12 , lithium bistrifluoromethanesulfonimide [LiN(SO 2 CF 3 ) 2 ] and N,N-dimethylformamide. Using N,N-dimethylformamide as solvent, polyacrylonitrile, Li 7 La 3 Zr 2 o 12 The organic-inorganic composite electrolyte slurry with a solid content of 15% is configured with lithium bistrifluoromethanesulfonimide at a mass ratio of 80:20:10.

[0080] (2) Place the commercial ternary NCM523 electrode sheet on a flat-plate coating machine, use a scraper to coat a layer of organic-inorganic composite electrolyte layer slurry obtained in step (1) on the side of the electrode sheet with ternary NCM523, and place it at 80°C ...

Embodiment 2

[0085] This example provides an all-solid-state battery and its preparation method. The main difference from Example 1 is that the ionic liquid monomer is different, and the preparation method is as follows:

[0086] (1) First configure the organic-inorganic composite electrolyte layer slurry, the composition of the organic-inorganic composite electrolyte layer slurry is polyacrylonitrile with a molecular weight of 600,000, Li 7 La 3 Zr 2 o 12 , lithium bistrifluoromethanesulfonimide [LiN(SO 2 CF 3 ) 2 ] and N,N-dimethylformamide. Using N,N-dimethylformamide as solvent, polyacrylonitrile, Li 7 La 3 Zr 2 o 12The organic-inorganic composite electrolyte slurry with a solid content of 15% is configured with lithium bistrifluoromethanesulfonimide at a mass ratio of 80:20:10.

[0087] (2) Place the commercial ternary NCM523 electrode sheet on a flat-plate coating machine, use a scraper to coat a layer of organic-inorganic composite electrolyte layer slurry obtained in step...

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Abstract

The invention relates to an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive electrode, an organic-inorganic composite electrolyte, a multifunctional intermediate layer and a negative electrode which are sequentially stacked, the preparation raw materials of the multifunctional middle layer comprise a high-molecular polymer, an ionic liquid monomer, an initiator and a solvent; the ionic liquid monomer comprises at least one unsaturated carbon-carbon double bond; and the cation of the ionic liquid monomer is selected from one or a combination of more of piperidine cation, quaternary ammonium salt cation and pyrrole cation. The all-solid-state battery is of an integrated structure, the problem that lithium intercalation and deintercalation reactions are difficult to complete due to the use of ionic liquid is solved, and the long-acting cycle stability of the all-solid-state battery is ensured.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an all-solid-state battery and a preparation method thereof. Background technique [0002] At present, solid-state batteries that use solid electrolytes instead of liquid electrolytes are one of the effective ways to solve the safety of lithium-ion batteries and improve energy density. Unlike liquid electrolytes, which have good deformation and contact capabilities, it is difficult for solid-state batteries to maintain effective contact with the electrodes, especially during battery cycling, where the surface morphology on the electrodes will continue to change, such as expansion, contraction, and lithium dendrites. These problems will aggravate the failure of lithium solid-state batteries. In order to improve the solid-solid interface contact, the electrolyte layer prepared by the electrolyte layer and the buffer layer or the modified layer is the most widely used and effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052H01M10/058C08F283/06C08F226/06C08F226/02
CPCH01M10/056H01M10/052H01M10/058C08F283/06H01M2300/0065C08F226/06C08F226/02Y02P70/50Y02E60/10
Inventor 尚旭石兴菊李艳红熊伟强谢普梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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