Copolymerization solid electrolyte, preparation method thereof and solid polymer lithium battery

A solid electrolyte and solid polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of low conductivity and difficulty in normal operation, achieve good conductivity and reduce the impact of battery performance , Improve the effect of cycle and energy density

Active Publication Date: 2022-02-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solves the technical problem that the ionic conductivity of the existing polymer so

Method used

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  • Copolymerization solid electrolyte, preparation method thereof and solid polymer lithium battery
  • Copolymerization solid electrolyte, preparation method thereof and solid polymer lithium battery
  • Copolymerization solid electrolyte, preparation method thereof and solid polymer lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation of electrolyte precursor: the polymer monomer 1,3,5-trioxane (TXE) and the copolymer 2,2,2-trifluoro-N,N-dimethylacetamide (FDMA) were mixed by mass Mix at a ratio of 5:3 to dissolve the solid and mix evenly; then add 1mol / L lithium difluorooxalate borate (LiDFOB) and stir at 40°C for about 0.5h until completely dissolved, and finally obtain a fully mixed electrolyte precursor .

[0038]Preparation of solid electrolyte: The electrolyte precursor obtained above was heated at 55° C. for 10 h, so that LiDFOB initiated the polymerization reaction of TXE and copolymer to form a solid polymer, that is, to obtain a polymer solid electrolyte.

[0039] The above-mentioned solid electrolyte was solidified in a sealed electrolytic cell to test the ionic conductivity, and a 200 μm thick copper sheet was used as a double electrode to test the conductivity at various temperatures at -20 to 70°C. as attached figure 1 As shown, the conductivity increases with temperature,...

Embodiment 2

[0041] Preparation of electrolyte precursor: the polymer monomer 1,3,5-trioxane (TXE) and the copolymer 2,2,2-trifluoro-N,N-dimethylacetamide (FDMA) were mixed by mass Mix at a ratio of 5:3 to dissolve the solid and mix evenly; then add 1 mol / L lithium difluorooxalate borate (LiDFOB) and stir for about 15 minutes until completely dissolved, and finally a well-mixed electrolyte precursor is obtained.

[0042] Preparation of solid electrolyte and assembly of solid-state battery: Take 10 μL of the obtained precursor and inject it between the positive and negative electrodes inside the battery, so that the liquid precursor to be polymerized can fully infiltrate the positive, negative and separator of the battery, and then complete the assembly of the battery; , the interpolymer is a fluorinated amide compound, and the positive electrode is LiNiCo 0.1 mn 0.1 o 2 (NCM811), the negative electrode is lithium metal, and the separator is Celagard2400. Finally, move the above-assemble...

Embodiment 3

[0047] Preparation of electrolyte precursor: the polymer monomer 1,3,5-trioxane (TXE) and the copolymer 2,2,2-trifluoro-N,N-dimethylacetamide (FDMA) were mixed by mass Mix at a ratio of 5:4 to dissolve the solid and mix evenly; then add 2mol / L lithium difluorooxalate borate (LiDFOB) and stir for about 20 minutes until completely dissolved, and finally a fully mixed electrolyte precursor is obtained.

[0048] Preparation of solid electrolyte and assembly of solid-state battery: Take 10 μL of the obtained precursor and inject it between the positive and negative electrodes inside the battery, so that the liquid precursor to be polymerized can fully infiltrate the positive, negative and separator of the battery, and then complete the assembly of the battery; , the interpolymer is a fluorinated amide compound, and the positive electrode is LiNiCo 0.1 mn 0.1 o 2 (NCM811), the negative electrode is lithium metal, and the separator is Celagard2400; finally, the assembled battery is...

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Abstract

The invention provides a copolymerization solid electrolyte, a preparation method thereof and a solid polymer lithium battery. The preparation method of the copolymerization solid electrolyte comprises the following steps: (1) uniformly mixing a polymer monomer and a copolymer, adding a lithium salt, and completely dissolving to obtain an electrolyte precursor, the copolymer being a fluorinated amide compound; and (2) adding an initiator into the electrolyte precursor, and carrying out copolymerization reaction on the polymer monomer and the copolymer under a heating condition to obtain the solid electrolyte. The solid electrolyte disclosed by the invention is simple in preparation process and high in applicability, can be matched with a relatively high-voltage positive electrode material in a room-temperature/low-temperature environment, and is obviously improved in ionic conductivity; and the in-situ polymerization technology improves the interface contact problem of the electrode/electrolyte, the interface resistance is also greatly improved, and excellent interface performance and cycle performance can be realized.

Description

technical field [0001] The invention belongs to the technical field of solid-state battery preparation, and more specifically relates to a copolymerized solid electrolyte, a preparation method thereof and a solid-state polymer lithium battery. Background technique [0002] In recent years, lithium-ion batteries and other secondary batteries have been widely researched and applied in the fields of portable electronics and power vehicles, and a series of problems have also emerged, such as the leakage of traditional liquid electrolytes, safety hazards caused by flammable and explosive Sexuality problems and poor cycle stability limit its further development. The use of highly safe and stable solid electrolytes instead of organic electrolytes can be better compatible with metal lithium anodes and high-voltage cathode materials, inhibit the growth of lithium dendrites, and is expected to realize solid-state lithium metal batteries with high energy density. [0003] At present, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525C08G65/16C08F122/20
CPCH01M10/0565H01M10/058H01M10/0525C08G65/16C08F122/1006Y02E60/10Y02P70/50
Inventor 郭新李卓郁睿
Owner HUAZHONG UNIV OF SCI & TECH
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