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Polymer electrolyte, preparation method thereof and application of polymer electrolyte in solid-state battery

A solid-state battery and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc., can solve the problems of lithium separation in batteries, easy thermal runaway, and uneven lithium-ion negative electrodes in metal lithium batteries. Effect of improving contact, reducing risk of thermal runaway, and improving interface performance

Pending Publication Date: 2022-06-24
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, it is necessary to improve the solid polymer electrolyte, improve its oxidation resistance, thermal stability and toughness, and improve the interface performance between the electrolyte and the negative electrode, so as to solve the problem of uneven lithium metal negative electrode, lithium separation in the battery cell, and easy generation of heat. Problems such as out of control

Method used

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  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in solid-state battery
  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in solid-state battery
  • Polymer electrolyte, preparation method thereof and application of polymer electrolyte in solid-state battery

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A polymer electrolyte used in batteries is a polymer electrolyte introduced with cyclopentene structure and active hydrogen groups. The polymer electrolyte includes a polymer and an electrolyte, and the cyclopentene structure and active hydrogen groups are located on the main chain of the polymer; the electrolyte includes a salt, and if the battery is a lithium-ion battery, the salt is Lithium salt. By introducing a cyclopentene structure into the polymer structure, the oxidation resistance and toughness of the electrolyte are improved, and the active hydrogen-containing functional group is introduced into the polymer structure, which can react with metal lithium to form a good interface in the lithium metal battery. It can react with lithium to form a compound of lithium when it is not uniform and the lithium precipitation occurs in the battery cell, which improves the interface stability.

[0033] As a further preferred embodiment, the raw material of the polymer ele...

Embodiment 2

[0048] A method for preparing a polymer electrolyte, comprising uniformly mixing a cyclopentene structural monomer, an active hydrogen structural monomer, a crosslinking agent, an initiator and an electrolyte, soaking, heating, and in-situ polymerization and then curing to obtain an in-situ cured electrolyte . The soaking time is 18~30h, such as 20h, 22.5h, 25h, etc.; the temperature during soaking is room temperature, usually 10~40℃, such as 25℃, 30℃, 35℃, etc.; the heating temperature is 50~ 100°C, such as 50°C, 60°C, 75°C, etc.; the heating time is 1-120h, preferably, the heating time is 20-30h, such as 20h, 24h, 30h, etc. The heating process is to solidify the polymer electrolyte in-situ. If other initiators are selected, other methods are used to solidify the polymer electrolyte in-situ, and the same effect as this embodiment can also be achieved.

[0049] The mass ratio of the cyclopentene structural monomer, the active hydrogen structural monomer, the crosslinking agen...

Embodiment 3

[0051] A solid-state battery includes a protective plate and an in-situ cured cell, wherein the in-situ cured cell comprises the polymer electrolyte described in Embodiment 1. The in-situ solidified cell includes a positive electrode, a negative electrode, a separator and the in-situ solidified electrolyte.

[0052] Experimental group 1

[0053] 5g ethylene glycol dicyclopentenyl ether acrylate, 15g acrylamide, 10g polyethylene glycol dimethacrylate, 0.3g azobisisobutyronitrile, 70g electrolyte (EC / EMC / DEC=1: 1:1 1M LiPF6) was evenly mixed, injected into the soft-packed cells assembled by NCM811 / Li, soaked at 25 °C for 24 h, and then placed in a 60 °C oven to heat and cure for 24 h to prepare an in-situ curing cell.

[0054] Experimental group 2

[0055] 10g cyclopentene, 10g dicyclopentene, 15g 2-hydroxyethyl methacrylate, 3g polyethylene glycol acrylate, 5g ethoxylated trihydroxymethyl propane triacrylate, 0.3g azo Diisobutyronitrile and 70g of electrolyte (EC / EMC / DEC=1:1...

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Abstract

The invention provides a polymer electrolyte, a preparation method thereof and application of the polymer electrolyte in a solid-state battery. Monomers of the polymer electrolyte comprise a cyclopentene structural monomer and an active hydrogen structural monomer, a main chain of the polymer comprises a cyclopentene structure and an active hydrogen group, and the polymer electrolyte is obtained by in-situ polymerization and curing of the cyclopentene structural monomer, the active hydrogen structural monomer, an initiator, a cross-linking agent and an electrolyte. The polymer electrolyte has excellent thermal stability, and can generate a chemical integrated interface with an electrode in a battery curing stage, so that the interface performance is improved. The in-situ polymerization curing method is adopted to prepare the in-situ curing electrolyte, so that the interfacial compatibility of the solid-state battery is improved, the manufacturing cost of the solid-state battery is reduced, and the performance of the solid-state battery is improved.

Description

technical field [0001] The invention relates to the field of solid-state polymer electrolytes, in particular to a polymer electrolyte and its application in solid-state batteries. [0002] technical background [0003] Improvements in energy density are critical to the development of next-generation rechargeable batteries for a variety of devices. However, high-energy-density batteries are often prone to thermal runaway, which poses safety hazards. Since the liquid electrolyte contains a large amount of flammable and easily leaking organic carbonate small molecule solvents, there are major safety hazards. At present, using solid electrolytes with higher thermal stability to replace traditional flammable liquid electrolytes is a better way to improve battery safety. . [0004] However, because lithium metal and pre-lithiated silicon anode materials are often used in high energy density batteries, metal lithium and lithium compounds are often distributed unevenly on the surfa...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525C08F232/00C08F220/56C08F222/14
CPCH01M10/0565H01M10/058H01M10/0525C08F232/00C08F220/56C08F222/14H01M2300/0082Y02P70/50
Inventor 刘帅李久铭杨琪俞会根张晓维尤猛
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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