Solid-state polymer electrolyte, solid-state battery comprising same and preparation method of solid-state battery

A technology of solid polymers and amorphous polymers, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problem of poor interface performance, poor effect of inhibiting lithium dendrites, and toxicity of polymer electrolytes Application and other issues to achieve the effect of improving antioxidant capacity, broadening the electrochemical window, and promoting chemical stability

Pending Publication Date: 2020-08-14
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The solid polymer electrolytes of existing solid-state batteries mostly use nitrile-containing materials as plasticizer materials for polymer electrolytes, because of their toxicity, polymer electrolytes are toxic and have limited applications
At the same time, most of the most commonly used polymer-based solid-state electrolytes, such as polyethylene oxide (PEO)-based polymer electrolytes, have low ionic conductivity, weak anti-oxidation ability, poor lithium dendrite inhibition effect, and compatibility with lithium negative electrodes. The shortcomings of poor properties and poor interface properties are due to the strong crystallinity and weak dielectric properties of the linear macromolecules of the polymer matrix material.

Method used

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  • Solid-state polymer electrolyte, solid-state battery comprising same and preparation method of solid-state battery
  • Solid-state polymer electrolyte, solid-state battery comprising same and preparation method of solid-state battery
  • Solid-state polymer electrolyte, solid-state battery comprising same and preparation method of solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a glove box filled with argon, 10.8g (0.1mol) DAMN (denoted as monomer A1 ) Dissolve in 20ml of anhydrous acetonitrile, add 2mmol of initiator 1-chloro-1-phenylethane, stir well, then add 2mmol of catalyst CuCl and 4mmol of ligand bipyridine (bpy), and mix well, The solution A1 was prepared. The solution A1 was heated to 80°C in an oil bath. After 12 hours of reaction and polymerization, the reaction was terminated, and then the solution was diluted with THF and passed through Al 2 O 3 The column was purified and washed with anhydrous ether to obtain a purified partially polymerized PDAMN, which was denoted as segment C1 and had a molecular weight of 18,000.

[0025] 0.54g PDAMN (segment C1) was mixed with 5mmol CuCl, 5mmol bpy and dissolved in anhydrous acetonitrile, then 2.94g methoxy polyethylene glycol methacrylate (denoted as monomer B1, M n =980, n=20), the reaction temperature was increased to 110°C, the reaction was terminated after 6 hours of reaction, and after...

Embodiment 2

[0028] In a glove box filled with argon, weigh 3g of A-B obtained in the manner in Example 1 in the reaction vessel 100 The type of macroinitiator D1 is dissolved in anhydrous acetonitrile, and then 0.1 mmol of catalyst CuBr, 0.1 mmol of ligand bipyridine (bpy) and 0.0108 g of monomer A1 are added, and mixed uniformly to prepare solution B1. Place solution B1 in The temperature was raised to 110℃ in the oil bath, the reaction was terminated after 5 hours of polymerization, and after purification and solvent removal, AB was obtained 100 -A type PDAMN-b-P(PEGMA)-b-PDAMN triblock copolymer, denoted as macroinitiator D2, M n Is 40,000.

[0029] Take 1M LiPF 6 Add 1g of macroinitiator D2, 0.0025mmol of CuCl, 0.0025mmol of bpy and 2.45g of monomer B, and mix well to obtain solution B2. The mixed solution B2 is injected into a lithium-ion battery with a PP diaphragm as a support material, and the battery is placed in a 60°C constant temperature oven for 48 hours to polymerize, so that th...

Embodiment 3

[0031] In a glove box filled with argon gas, 14.4g (0.1mol) monomer A2( ) Was dissolved in 25ml of anhydrous acetonitrile, and then 2mmol of initiator dichloromethane was added, and stirred evenly, then 2mmol of catalyst CuBr and 4mmol of tris(2-methylamino)ethylamine (Me 6 TREN) and mixed uniformly to prepare solution A2. The solution A2 was heated to 100°C in an oil bath. After 8 hours of reaction and polymerization, the reaction was terminated. After purification, solvent removal, and washing with anhydrous ether, a refined macromolecular initiator was obtained. Agent C2, the molecular weight is 16000.

[0032] 0.32g macroinitiator C2, 2mmol CuBr, 2mmol Me 6 TREN was mixed and dissolved in anhydrous acetonitrile, and 4g polyethylene glycol methacrylate (denoted as monomer B2, M n =1000, n=600, ), the reaction temperature was raised to 100°C, and the reaction was terminated after 6 hours of reaction. After purification and solvent removal, A-B 200 Type diblock copolymer, denote...

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Abstract

Disclosed is a solid polymer electrolyte comprising an amorphous polymer, the amorphous polymer is of a comb-like structure formed by copolymerizing monomer units; the monomer unit comprises a monomerunit with a polar group and a polyethylene glycol acrylate monomer unit. The invention also discloses a solid-state battery containing the solid-state polymer electrolyte and a preparation method ofthe solid-state battery. According to the solid polymer electrolyte disclosed by the invention, the amorphous polymer can improve the conduction speed of lithium ions and greatly improve the conductivity of the lithium ions. The high-dielectric structural unit (polar group) contained in the solid polymer electrolyte greatly enhances the oxidation resistance of the polymer electrolyte, widens the electrochemical window of the polymer electrolyte, and promotes the enhancement of chemical stability and electrochemical stability. Meanwhile, lithium dendrites can be inhibited, and oxygenolysis of the electrolyte is inhibited. The in-situ copolymerization of the solid polymer electrolyte and the high-dielectric structure unit can improve the interface performance of the electrode and the electrolyte.

Description

Technical field [0001] The invention belongs to the field of chemical power sources, and specifically relates to a solid polymer electrolyte, a solid battery containing it, and a preparation method thereof. Background technique [0002] The solid polymer electrolytes of existing solid-state batteries mostly use nitrile-containing materials as plasticizer materials for the polymer electrolytes. Because of their toxicity, the polymer electrolytes are toxic and have limited applications. At the same time, most of the most commonly used polymer-based solid electrolytes such as polyethylene oxide (PEO)-based polymer electrolytes have low ion conductivity, weak oxidation resistance, poor inhibition of lithium dendrites, and compatibility with lithium negative electrodes The disadvantages of poor performance and poor interface performance are caused by the strong crystallinity and weak dielectric properties of the linear macromolecules of the polymer matrix material. Summary of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 陈超曹晨王康平李旭李洋
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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