Solid-state electrolyte and solid-state battery comprising same

A solid electrolyte, ionic conductivity technology, applied in the direction of electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve the problems of volume expansion of positive and negative materials, poor interface compatibility, easy interface separation, etc. The effect of increasing crosslinking density, strong mechanical strength and avoiding material damage

Active Publication Date: 2021-12-31
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the solid electrolyte can also solve the problems of high interfacial impedance with electrodes, poor interfacial compatibility, and easy

Method used

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  • Solid-state electrolyte and solid-state battery comprising same
  • Solid-state electrolyte and solid-state battery comprising same
  • Solid-state electrolyte and solid-state battery comprising same

Examples

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Example Embodiment

[0068]

[0069] The present invention also provides a method of preparing a solid electrolyte comprising the steps of:

[0070] S1: Diisocyanate and alcohol compound polymerization to obtain polymers;

[0071] S2: The polymer is ligated by lithiation to obtain a lithiated polymer.

[0072] According to the present invention, the method further comprises the steps of:

[0073] S3: Add ion conductors to obtain the solid electrolyte.

[0074] According to the present invention, the step S1 specifically includes the steps of:

[0075] S1-1: Dixinocyanate is dissolved in an organic solvent, and stirring for a certain time under an argon atmosphere;

[0076] S1-2: Add the alcohol compound and catalyst to the above solution, stirred at a certain temperature (e.g., 12 to 48 h);

[0077] S1-3: The alcohol solvent was added to the above solution, stirred for a certain time (e.g., 1 to 5 h), remove excess isocyanate groups; to obtain a polymer solution.

[0078] According to the present inv...

Example Embodiment

[0104] Example 1

[0105] (a) Preparation of solid electrolyte

[0106] (1) 1.5 g of ilover diisocyanate (IPDI) is dissolved in 100 mL anhydrous DMF, and stirring for a certain time under argon atmosphere;

[0107] (2) 1.6 g of glutamanediol and a drop of dibutyltin (DBTDL) were added to 80 ° C for 24 h at 80 ° C.

[0108] (3) 3 ml of methanol was added to the above solution, stirred for 1 h, remove excess isocyanate groups.

[0109] (4) 3 g of lithium hydrogenide was added to the above solution, and the mixture was stirred at 80 ° C for 24 h, and the lithiated reaction was performed.

[0110] (5) 0.3 g of a lithium salt and 0.2 g of LlZTO powder were added to the above solution to increase solid electrolyte ion conductivity.

[0111] (6) Import the product into the polytetrafluoroethylene mold, and then dried at 90 ° C for 48 h in the blower oven, and then placed in a vacuum oven for 24 hours, and the residual solvent was removed, and the solid electrolyte was obtained, the solid...

Example Embodiment

[0119] Example 2

[0120] Other operations are the same as in Example 1, which distinguishes that the preparation process of solid electrolytes is different:

[0121] (1) 1.5 g of dimethane diisocyanate (MPI) was dissolved in 100 ml anhydrous DMF, and stirred at an argon atmosphere for a certain period of time;

[0122] (2) 1.6 g of glutamanediol and a drop of dibutyltin (DBTDL) were added to 80 ° C for 24 h at 80 ° C.

[0123] (3) 3 ml of methanol was added to the above solution, stirred for 1 h, remove excess isocyanate groups.

[0124] (4) 3 g of lithium hydrogenide was added to the above solution, and the mixture was stirred at 80 ° C for 24 h, and the lithiated reaction was performed.

[0125] (5) 0.3 g of a lithium salt and 0.2 g of LlZTO powder were added to the above solution to increase solid electrolyte ion conductivity.

[0126] (6) Import the product into the polytetrafluoroethylene mold and place a blow molding of 90 ° C for 48 h, and then placed in a vacuum oven for ...

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Abstract

The invention relates to a solid-state electrolyte and a solid-state battery comprising the same. The solid-state electrolyte comprises a lithiated polymer, and the lithiated polymer is a polymer obtained by further lithiating a polymer of diisocyanate and an alcohol compound. The solid-state electrolyte has a self-healing function, can reduce performance loss caused by damage to the greatest extent, and fundamentally realizes the characteristics of high safety, high reliability and long service life. In addition, the solid-state electrolyte can also solve the problems that the interface impedance between the solid electrolyte and the electrode is large, the interface compatibility is poor, and the interface is easy to separate due to volume expansion and shrinkage of positive and negative electrode materials in the charging and discharging process.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage batteries, in particular to a solid electrolyte, a preparation method thereof and a solid battery comprising the solid electrolyte. Background technique [0002] Lithium battery is one of the fastest growing batteries at present. However, with the increasing market demand for lithium batteries, the safety of lithium batteries has become increasingly prominent. Many spontaneous combustion accidents in mobile phones and cars are caused by a short circuit inside the battery that generates a lot of heat, causing the internal electrolyte to decompose. The technology of using solid electrolyte instead of organic electrolyte is expected to fundamentally solve the above problems. [0003] Solid electrolytes include inorganic solid electrolytes and organic polymer solid electrolytes. Although the use of solid electrolytes inhibits dendrite growth to a certain extent and solves the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 董德锐赵伟张赵帅唐伟超李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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