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A polymer electrolyte capable of working in a wide temperature range and its preparation method

A technology of polymers and electrolytes, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, sustainable manufacturing/processing, etc., can solve the problem of film-forming properties, strength affecting ionic liquids, inability to maintain size, shape and mechanical properties, and difficulty in inhibiting branching. Crystal nucleation/growth and other issues to achieve the effect of improving cycle life and Coulombic efficiency, good mechanical properties and electrical stability, maintaining mechanical properties and safety

Active Publication Date: 2022-02-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current common linear solid polymer electrolytes are limited by ionic conductivity, and are generally used at high temperatures (environment temperature higher than 40°C), and the polymers are in a fluid molten state at high temperatures, unable to maintain their original size, shape and mechanical properties. properties, making it difficult to inhibit dendrite nucleation / growth
Not only that, polymer electrolyte membranes are usually cast into membranes when assembling batteries, and the contact interface between the obtained electrodes and the electrolyte often has poor contact, resulting in a huge interface impedance, and a large amount of volatiles will be evaporated when casting the membrane. Solvents are wasted and pollute the environment
[0005] At present, the existing ionic conductivity can be modified by adding nano-inorganic fillers and ionic liquids. However, the technology of adding inorganic materials requires high selectivity for the size, type, and amount of nanoparticles, and has a negative effect on film-forming properties. , The strength has an uncertain effect. Ionic liquids have good conductivity. At present, there are studies using ionic liquids to improve the solubility of end groups. However, for the types of ionic liquids and hyperbranched polymers, the degree of ionization and the degree of hyperbranching There are technical difficulties in matching

Method used

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  • A polymer electrolyte capable of working in a wide temperature range and its preparation method
  • A polymer electrolyte capable of working in a wide temperature range and its preparation method
  • A polymer electrolyte capable of working in a wide temperature range and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0065] (1) Assembly of solid polymer metal lithium battery

[0066] Step 1) Preparing the bare cell: under high-purity argon gas, the lithium sheet, the separator Celgard and the lithium sheet are sequentially stacked in the electrode shell to form a bare cell.

[0067] Step 2) prepare polymer precursor solution: prepare polymer precursor solution under high-purity argon, wherein the monomer A of the first step polymerization reaction is 3-methyl-3-oxetane methanol, initiator It is boron trifluoride diethyl ether, and the volume percentage is 0.5%. It reacts at room temperature (25° C.) for 24 hours and polymerizes to form a hyperbranched macromolecule with a molecular weight of 1000-2000. Polyoxymethylene (volume ratio 1:9), lithium hexafluorophosphate with a concentration of 2 mol·L-1, stirred and mixed uniformly to obtain a polymer precursor solution.

[0068] Step 3) Liquid injection and in-situ polymerization: inject the polymer precursor solution obtained in step 2) int...

Embodiment 1-2

[0074] Except that the polymerized monomers in the step (2) of Example 1-1 were changed to tetrahydrofurfuryl alcohol and paraformaldehyde, the other conditions were completely the same, and the test performance was listed in Table 1.

Embodiment 1-3

[0076] Except that the polymerized monomers in the step (2) of Example 1-1 were changed to tetrahydrofurfurylamine and paraformaldehyde, the other conditions were completely the same, and the test performance was listed in Table 1.

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Abstract

The invention discloses a polymer electrolyte capable of working in a wide temperature range, its preparation method and its application in a solid lithium (sodium) secondary battery. The polymer electrolyte of the present invention is prepared by in-situ polymerization on the surface of the substrate from a precursor solution containing polymerized monomers, initiators and electrolyte salts, and presents a hyperbranched structure with no main chain and multiple branches, and has ionic conductivity and It has the advantages of high migration number, wide electrochemical window, good mechanical strength, etc., and can work stably in the temperature range of -40-110°C. At the same time, the preparation method of the polymer electrolyte is simple, the conditions are mild, the preparation cost is low, the raw materials are easily available, and it is suitable for scale-up production. The polymer electrolyte of the present invention is used to construct a solid-state lithium (sodium) secondary battery, which can effectively widen the working temperature of the battery and improve the safety of the battery under extreme working conditions.

Description

technical field [0001] The invention belongs to the field of chemical power sources and also belongs to the technical field of energy materials, and specifically relates to a novel polymer electrolyte capable of working in a wide temperature range and a preparation method thereof. Background technique [0002] Compared with the organic liquid electrolytes commonly used commercially at present, the polymer electrolyte has the characteristics of no leakage, good safety performance, good electrochemical stability, and good mechanical properties, and it can also be prepared into any shape and size , making lithium-ion batteries develop in the direction of miniaturization and thinning. The original polymer electrolyte was the linear polymer PEO, a polymer consisting of one main chain -(CH2CH2O)n-. However, such a regular linear structure will make the molecular chains easy to entangle, and face the problems of crystallization at room temperature and low ionic conductivity. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00H01M10/0525H01M10/0565H01M10/058
CPCC08G83/005C08G83/008H01M10/0565H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 郭玉国丑佳张娟辛森
Owner INST OF CHEM CHINESE ACAD OF SCI
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