Preparation method of cyclic polymer and application of structured gel electrolyte based on polymer in solid sodium battery

A technology of cyclic polymers and gel electrolytes, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as lack of reports, achieve low cost, high electrochemical stability window, and simple preparation methods

Active Publication Date: 2022-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relevant research and reports on the preparation of polymer-based electrolytes by ring-structured polymers are still relatively lacking.

Method used

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  • Preparation method of cyclic polymer and application of structured gel electrolyte based on polymer in solid sodium battery
  • Preparation method of cyclic polymer and application of structured gel electrolyte based on polymer in solid sodium battery
  • Preparation method of cyclic polymer and application of structured gel electrolyte based on polymer in solid sodium battery

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preparation example Construction

[0040] The invention discloses a preparation method of a structured gel electrolyte based on a cyclic polymer, which comprises the following steps:

[0041]1) A certain amount of initiator azobisisobutylcyanide (AIBN), chain transfer agent 4-cyano-4-(thiobenzoyl) valeric acid (CPADB), polyethylene glycol diacrylate (PEGDA ) monomers were added into a three-necked flask equipped with reaction solvent methyl ethyl ketone and fully dissolved by magnetic stirring, and the molar ratio of AIBN, CPADB and PEGDA was 1: (2-5): (100-1000);

[0042] 2) Deoxygenation by argon bubbling for 30 minutes;

[0043] 3) Submerge the three-neck flask into an oil bath preheated to 65°C to start the reaction, and the reaction is carried out under the protection of argon;

[0044] 4) Gel permeation chromatography is used to monitor the polymer molecular weight;

[0045] 5) When the molecular weight of the reaction is close to the set value of 17000-20000Da, stop the reaction and quench the free rad...

Embodiment 1

[0059] The feed ratio of initiator azobisisobutylcyanide (AIBN), chain transfer agent 4-cyano-4-(thiobenzoyl)valeric acid (CPADB) and polyethylene glycol diacrylate (PEGDA) is 1:5:1000, react at 65°C to obtain cyclic polyethylene glycol diacrylate (k-PEGDA) with a molecular weight of 17000Da. The obtained k-PEGDA is added into the liquid electrolyte, and the structured gel electrolyte is obtained through ultraviolet polymerization.

Embodiment 2

[0061] The feed ratio of initiator azobisisobutylcyanide (AIBN), chain transfer agent 4-cyano-4-(thiobenzoyl)valeric acid (CPADB) and polyethylene glycol diacrylate (PEGDA) is 1:5:250, reacted at 65°C to obtain cyclic polyethylene glycol diacrylate (k-PEGDA) with a molecular weight of 17000Da. The obtained k-PEGDA is added into the liquid electrolyte, and the structured gel electrolyte is obtained through ultraviolet polymerization.

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Abstract

The invention discloses a preparation method of a cyclic polymer and application of a structured gel electrolyte based on the polymer in a solid-state sodium battery, and belongs to the technical field of solid-state sodium batteries. The invention discloses a preparation method of a structured gel electrolyte based on a cyclic polymer, which comprises the following steps: preparing the cyclic polymer by using polyethylene glycol diacrylate, a chain transfer agent and an initiator through a reversible addition fragmentation chain transfer free radical polymerization strategy, then adding the cyclic polymer into a liquid electrolyte to obtain a polymerization precursor solution, and finally preparing the structured gel electrolyte based on the cyclic polymer. And then the structured gel electrolyte is obtained by adopting a photo-initiated active free radical polymerization mode. The preparation method is simple in synthesis route and low in production cost. Meanwhile, the structured gel electrolyte disclosed by the invention has relatively high ionic conductivity and an electrochemical stability window, and the assembled solid sodium battery has excellent long-term cycling stability.

Description

technical field [0001] The invention belongs to the technical field of solid-state sodium batteries, and in particular relates to a preparation method of a cyclic polymer and the application of a structured gel electrolyte based on the polymer in solid-state sodium batteries. Background technique [0002] A solid-state sodium metal battery refers to an electrochemical energy storage device that directly uses metallic sodium as the negative electrode and replaces the traditional liquid electrolyte with a solid electrolyte. It aims to solve a series of safety problems caused by the volatile electrolyte, leakage and serious interface side reactions in liquid batteries. However, because the research on solid-state sodium batteries lags behind that of solid-state lithium batteries, a series of basic scientific issues and key technologies such as ionic conductance, solid-solid contact, and interface charge transport are still in the preliminary exploration stage, and there is stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F122/20H01M10/054H01M10/0565
CPCC08F122/20H01M10/054H01M10/0565C08F2438/03Y02E60/10
Inventor 周德重周亚男唐伟李秋霞
Owner XI AN JIAOTONG UNIV
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