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A kind of polymer electrolyte and its preparation method and application

A polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as poor lithium dendrite effect

Active Publication Date: 2021-05-11
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polymer electrolyte, thereby solving the problem that the existing polymer electrolyte has poor effect in inhibiting the growth of lithium dendrites

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The polymer electrolyte of this embodiment is prepared by the following steps:

[0041] 1) Dissolve 5.66mg of Grubbs in 1.33mL of dichloromethane to obtain a catalyst solution;

[0042] 202mg 5-norbornene-2-dimethyl phosphate (M1), 187mg 5-norbornene-2-polyethylene glycol monomethyl ether (M2), 100mg bis-norbornene grafted polyethylene glycol Alcohol (M3) was dissolved in 30mL of dichloromethane to obtain a monomer solution;

[0043] Mix the catalyst solution and the monomer solution, stir and react at room temperature for 10 hours, when the system turns from pink to dark brown, add vinyl ether to terminate the reaction, and distill off the solvent under reduced pressure to obtain polymer A;

[0044] 2) Dissolve polymer A and bromotrimethylsilane in 5 mL of dichloromethane respectively, mix the dissolved two solutions and react at room temperature for 16 h, then add methanol (5-norbornene-2-dimethyl The molar ratio of base phosphate, trimethylbromosilane, and methanol...

Embodiment 2

[0052] The preparation process of the polymer electrolyte in this example is basically the same as in Example 1, the only difference is that in step 1), the amounts of M1, M2, and M3 added are 202 mg, 236 mg, and 339 mg, respectively, and the molar ratio of M1:Grubbs second-generation catalyst 150:1; step 2), the reduction reaction is to stir the reaction at room temperature for 18h, add methanol and then stir the reaction at room temperature for 28h; step 3), stir the reaction at 85°C for 30h; step 4), in Under 140°C and 4.5MPa, hydrogenation reaction was carried out for 24h.

[0053] The initial thermal decomposition temperature of the polymer electrolyte obtained in Example 2 is 356.8°C, and the average polymerization degree ratio of structural unit A (m=10), structural unit B (n=15), and structural unit C is 2:1:1.

Embodiment 3

[0055] The preparation process of the polymer electrolyte in this example is basically the same as in Example 1, the only difference is that in step 1), the amounts of M1, M2, and M3 added are 202 mg, 340 mg, and 370 mg, respectively, and the molar ratio of M1:Grubbs second-generation catalyst 150:1; in step 2), the reduction reaction is to stir the reaction at room temperature for 20h, add methanol and then stir the reaction at room temperature for 30h; in step 3), stir the reaction at 95°C for 28h; in step 4), in Under 160°C and 5.0MPa, hydrogenation reaction was carried out for 24h.

[0056] The initial thermal decomposition temperature of the polymer electrolyte obtained in Example 2 is 360.2°C, and the average polymerization degree ratio of structural unit A (m=7), structural unit B (n=8), and structural unit C is 1:1:1.

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Abstract

The invention relates to a polymer electrolyte and its preparation method and application. The polymer electrolyte includes three structural units of structural unit A, structural unit B and structural unit C, and the polymer electrolyte is solid at room temperature. The polymer electrolyte of the present invention has three structural units: structural unit A, structural unit B, and structural unit C, wherein structural unit A is a lithium ion supply unit; structural unit B is a lithium ion conducting unit; structural unit C is a polymer structure The supporting unit provides a certain mechanical strength for the polymer electrolyte, and also has the function of lithium ion transport; the structural unit A, the structural unit B, and the structural unit C are connected by themselves or each other with a single bond. The mechanical properties of the polymer electrolyte and The flexibility is good, and it can change continuously according to the change of external force, thereby reducing the influence on the transmission of lithium ions, maintaining the uniformity of current density, and effectively inhibiting the growth of lithium dendrites.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a polymer electrolyte and its preparation method and application. Background technique [0002] Due to its higher theoretical specific energy, lithium is more suitable as an anode material for lithium batteries than carbon. During the cycle charge and discharge process of lithium battery, due to the inhomogeneous diffusion density of ions in the electrolyte, there will be uneven deposition of lithium on the negative electrode of lithium sheet. This continuous accumulation and deposition will produce a structure that is more prominent than other deposition layers, namely Lithium dendrites. The generation of lithium dendrites will not only lead to a significant decline in the overall performance of lithium batteries, but may also cause internal short circuits in the batteries, resulting in serious consequences such as thermal runaway and even explosions. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 王永勤薛旭金张永明薛峰峰郭贤慧孙玉娟常仑段红文王建萍韩乐李洁
Owner DO FLUORIDE CHEM CO LTD
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