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A kind of polymer solid electrolyte and its preparation method and application

A solid electrolyte and polymer technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of long-term cycling, short circuit, low ionic conductivity, etc., and achieve a large number of lithium ion migration and high cycle stability. , the effect of high conductivity

Active Publication Date: 2021-08-03
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer solid electrolyte has the advantages of good thermal stability, high stability to lithium, good cycle performance, and can be prepared into flexible thin film batteries; but low ionic conductivity, poor electrode wettability, low working power, The development and application of polymer solid-state lithium batteries are limited
Inorganic solid electrolytes have high ionic conductivity, wide electrochemical window, and good stability have attracted widespread attention. However, inorganic solid electrolytes are not easy to prepare, have poor interface contact, poor mechanical properties, and are sensitive to water and oxygen. application
[0003] At present, polymer solid-state electrolytes are the most promising solid-state electrolytes for practical production, mainly because polymer solid-state electrolytes have good processability, and the main bottleneck problem is the low ion conductivity, which hinders their practical application.
In addition, due to the poor mechanical properties of polymer electrolytes, it is easy to cause lithium dendrites to puncture the electrolyte membrane and cause a short circuit, resulting in inability to cycle for a long time. Therefore, there are two major problems in the practicality of polymer electrolytes that need to be solved urgently. One is the ionic conductivity. Lower, second, poor mechanical properties

Method used

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  • A kind of polymer solid electrolyte and its preparation method and application
  • A kind of polymer solid electrolyte and its preparation method and application
  • A kind of polymer solid electrolyte and its preparation method and application

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preparation example Construction

[0078] The present invention also provides a method of preparing a polymer solid electrolyte, the method comprising the steps of:

[0079] Step (S1): dissolve the rubber in an organic solvent, stir well, form a solution A;

[0080] Step (S2): The oligomers, lithium salts, plasticizers, photoinitiators, and small molecular additives thereof, plasticizer, photoinitiator, and small molecule additives thereof, stirred well, form solution B, and form a solution B, and ultraviolet light Irradiate;

[0081] Step (S3): Mix the solution A and the solution B irradiated with ultraviolet light, form a homogeneous solution, add a thermal initiator, stir well, and coated in the surface of the base film after stirring, and prepare the polymer. Solid electrolyte.

[0082] In a specific embodiment of the invention, the step (S1) is specifically, dissolved in the organic solvent, stirred for 10-24 h, so that the rubber forms a homogeneous solution in an organic solvent to form a solution A. Wherein...

Embodiment 1

[0109] (1) 1 g of natural rubber is dissolved in 50 mL of acetonitrile solution, stirred evenly, forming a solution A having a concentration of 20 mg / ml;

[0110] (2) 3.4 g of ohlicate, 10 g of polyethylene glycol methyl methacrylate, 6.8 g of propylene carbonate, 2.6 g butbontonitrile dissolved in 100 mL of acetonitrile, add 0.04 g of 2-hydroxyl group -2-methyl-1-phenylcycetone, stir well to form solution B, which will continue to be 30 min under ultraviolet light;

[0111] (3) The prepared solution A is mixed with the solution B, and 0.04 g of azo diisobutyronitrile is added, and it is applied to the centrifugal film, and 0.1 MPa pressure, heat pressures 100 ° C, 6H, film formation.

[0112] (4) The prepared polymer solid electrolyte is paired with lithium iron phosphate positive electrode sheet, a lithium metal negative electrode sheet, and a lithium ion battery is made using a laminated process.

Embodiment 2

[0114] (1) 0.4 g of a moisture rubber was dissolved in 50 mL of ethyl acetate solution, stirred well, forming a solution of a solution concentration of 8 mg / ml;

[0115] (2) 2.32 g of bis (trifluoromethylsulfonic acid) imide, 12.2 g of polyethylene glycol acrylate, 4.64 g of vinyl carbonate and 2.64 g of propennitrile were added and dissolved in 100 ml of acetonitrile , 0.1 g of 1-hydroxy cyclohexylphenylphenyl ketone was added, and the mixture was mixed to form a solution B, and then thus trigger 30 min under ultraviolet light;

[0116] (3) The prepared solution A was added to the solution B, and 0.1 g of azo diiohenepin nitrile was added, and it was applied to the centrifugal film, 0.5 MPa pressure, heat pressure 200 ° C, 6H, film formation;

[0117] (4) The prepared polymer solid electrolyte is paired with a lithium cobalt-positive electrode sheet, a lithium metal negative electrode sheet, and a lithium ion battery is made using a winding process.

[0118] figure 1 For the S...

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Abstract

The invention provides a polymer solid electrolyte, a preparation method and application thereof. In the present invention, rubber is firstly dissolved in an organic solvent to prepare solution A, and then lithium salt, plasticizer, photoinitiator, acrylate and its derivative oligomers are mixed with small molecule additives to initiate solution B to form high The polymer solid electrolyte with ionic conductivity has good fluidity and compatibility with the interface of positive and negative electrodes, and then the solution B and solution A are thermally induced to cross-link and blend, so that the polymer in solution B can be grafted into the rubber, coated on the surface of the base film and hot-pressed to obtain a polymer solid electrolyte. When the polymer solid electrolyte is used in a lithium ion battery, it has the characteristics of large lithium ion migration number, can inhibit the growth of lithium dendrites, has a stable structure, high electrical conductivity, and high cycle stability.

Description

Technical field [0001] The present invention belongs to the technical field of lithium batteries, and in particular to a polymer solid electrolyte and a preparation method thereof and an application in a lithium ion battery. Background technique [0002] Since solid-state electrolytes can fundamentally solve the problem of current commercial lithium batteries, solid lithium batteries have become a research hotspot in recent years. Common solid electrolytes are divided into polymer solid electrolytes and inorganic solid electrolytes. The polymer solid electrolyte has the advantages of good thermal stability, high lithium stability, better circulating performance, and can be prepared into a flexible thin film battery; however, low ion conductivity, poor electrode infiltration, low work power, The development and application of polymer solid lithium batteries are made limited. The inorganic solid electrolyte has high ion conductivity, wide electrochemical windows, and good stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 袁号李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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