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Sodium ion bifunctional gel polymer electrolyte, and preparation method and application thereof

A gel polymer, sodium ion battery technology, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., to achieve the effect of improving stability, simple preparation process, and enhanced stability

Active Publication Date: 2021-12-28
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are few gel polymer electrolytes that can meet the practical requirements in terms of ionic conductivity, sodium ion migration number, mechanical properties, and electrochemical stability. Therefore, it is necessary to develop gel polymers with excellent properties. Electrolyte, providing prerequisites for the application of solid-state sodium-ion batteries is an urgent technical need

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  • Sodium ion bifunctional gel polymer electrolyte, and preparation method and application thereof
  • Sodium ion bifunctional gel polymer electrolyte, and preparation method and application thereof
  • Sodium ion bifunctional gel polymer electrolyte, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of gel polymer electrolyte BFGPE is as follows:

[0059] (1) Synthesis of boron-containing ternary cross-linking agent B-HEMA by transesterification: measure 2.6 mL of trimethyl borate and 8.5 mL of hydroxyethyl methacrylate and dissolve them in 25 mL of anhydrous acetonitrile, and place the mixture in an inert Stir and react at 50°C for 3-4 hours under the protection of the atmosphere, then raise the temperature to 70°C, continue stirring for 3-5 hours, and remove the methanol produced by the reaction to ensure that the reaction proceeds completely. After the reaction, unreacted trimethyl borate and residual solvent were distilled off under reduced pressure, and vacuum-dried. The obtained pale yellow liquid product (namely B-HEMA) was sealed and stored in a glove box for use to prevent its hydrolysis.

[0060] (2) Preparation of boron-containing polymer-modified porous support PMS-B by in-situ polymerization: B-HEMA synthesized in the above step...

Embodiment 2

[0073] The preparation method of gel polymer electrolyte BFGPE is as follows:

[0074] (1) Synthesis of boron-containing ternary crosslinking agent B-HEMA by transesterification: the preparation method is the same as in Example 1.

[0075] (2) Preparation of boron-containing polymer-modified porous support PMS-B by in-situ polymerization: B-HEMA synthesized in step (1), thermal initiator and benzoyl peroxide (BPO) were dissolved in N,N-bis A precursor mixed solution with a mass concentration of 5% was prepared in methylformamide, wherein the amount of BPO added was 0.1% of the mass of B-HEMA; the polyimide membrane was used as a porous support, and the precursor mixed solution prepared above was Add it dropwise to the porous support to obtain a glass fiber support loaded with the precursor mixed solution and transfer it to a sealed heating chamber, and react at 60°C for 24 hours for in-situ thermal polymerization to obtain PMS-B. Denoted as electrolyte matrix.

[0076] (3) P...

Embodiment 3

[0080] The preparation method of gel polymer electrolyte BFGPE is as follows:

[0081] (1) Synthesis of boron-containing ternary crosslinking agent B-HEMA by transesterification: the preparation method is the same as in Example 1.

[0082] (2) Preparation of boron-containing polymer-modified porous support PMS-B by in-situ polymerization: the B-HEMA synthesized in (1) and thermal initiator AIBN were dissolved in acetonitrile to prepare a precursor mixture with a mass concentration of 30%. Among them, the amount of AIBN added is 5% of the mass of B-HEMA; the polyimide membrane is used as a porous support, and the precursor mixed solution prepared above is added dropwise to the porous support to obtain a glass loaded with a precursor mixed solution. The fibrous support was transferred to a sealed heating chamber, and reacted at 90°C for 2 hours for in-situ thermal polymerization to obtain PMS-B, which was denoted as the electrolyte matrix.

[0083](3) Prepare the multifunctiona...

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Abstract

The invention provides a sodium ion bifunctional gel polymer electrolyte and a preparation method and application thereof. The gel polymer electrolyte comprises an electrolyte matrix, sodium alginate and an electrolyte, wherein the electrolyte matrix comprises a boron-containing polymer and a porous support body; the boron-containing polymer is obtained by in-situ polymerization on a porous support body; the boron-containing polymer contains rich polar ethyoxyl groups, and the sodium alginate is attached to the electrolyte matrix after being combined with the boron-containing polymer. According to the electrolyte, on one hand, the stability of a positive electrode / electrolyte interface can be improved by utilizing the metal affinity characteristic of sodium alginate; and on the other hand, the boron-containing polymer is introduced into the electrolyte, so that the concentration polarization of the battery can be reduced by increasing the sodium ion transference number of the electrolyte, a stable negative electrode / electrolyte interface can be constructed by inducing uniform sodium deposition, and the solid-state sodium ion battery assembled by adopting the electrolyte has good rate capability and cycling stability.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a sodium ion bifunctional gel polymer electrolyte, its preparation method and application. Background technique [0002] The development of efficient and clean energy storage technology is one of the most effective ways to realize the important strategies of "carbon neutrality" and "carbon peak". Among many energy storage technologies, lithium-ion batteries have achieved rapid development in the past few decades, but the limited lithium resources on the earth severely restrict the development of lithium-ion batteries. Compared with lithium-ion batteries, sodium-ion batteries have outstanding advantages such as rich storage of sodium resources, wide distribution and low cost, and have become a research hotspot. With the deepening of research, sodium-ion batteries will become more and more cost-effective, and are expected to be used in It will be widely used instead of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/42H01M10/054
CPCH01M10/0565H01M10/4235H01M10/054H01M2300/0082Y02E60/10
Inventor 车海英陈苏莉马紫峰
Owner 浙江钠创新能源有限公司
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