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Polymer electrolyte membrane and solid-state battery

An electrolyte membrane and polymer technology, used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolytes, etc., can solve problems such as high price, no significant increase in electrical conductivity, and difficulty in improving compatibility.

Active Publication Date: 2019-11-05
SAIC MOTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high crystallinity of PEO, its room temperature ionic conductivity is low (~10 -6 S / cm), so it needs to be further modified to increase the conductivity
[0003] At present, the modification of PEO-based electrolytes mainly focuses on the following methods: (1) Adding small-molecule plasticizers, using the adsorption and swelling effects of polymer segments on plasticizers, can greatly improve the ion conductivity, and the preparation is simple , but it will lead to a significant decline in mechanical properties, and the compatibility and stability of each component will be reduced; (2) Adding ionic liquids can improve electrical conductivity, non-flammability, low vapor pressure, and high stability, but it will cause The mechanical properties are reduced, the ion mobility is not significantly improved, and the price is expensive; (3) block copolymerization, cross-linking, grafting and other modification methods can simultaneously improve the ion conductivity and ion mobility, while taking into account the mechanical properties, but the preparation The process is complicated, the batch stability is poor, and the application requirements cannot be met; (4) The introduction of different functional components for blending can improve the overall performance of the modified polymer, including dimensional stability, electrochemical stability and heat resistance (5) adding inorganic active / inert fillers to reduce crystallinity, and at the same time, the surface of fillers and polymer chains and lithium The interaction between ions promotes the formation of multiple fast lithium ion channels on the surface, thereby increasing the electrical conductivity and effectively improving the mechanical properties. However, inorganic fillers are prone to agglomeration in the polymer matrix, and it is difficult to achieve uniform dispersion and solve the slurry problem. Settlement problem

Method used

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  • Polymer electrolyte membrane and solid-state battery
  • Polymer electrolyte membrane and solid-state battery
  • Polymer electrolyte membrane and solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] After diluting sodium dodecylbenzene sulfonate with water, first perform proton exchange with hydrochloric acid, and then add lithium hydroxide to prepare a neutral solution to obtain lithium dodecyl benzene sulfonate with a solid content of about 10%.

[0053] Mix PEO with a molecular weight of 400,000 g / mol and lithium dodecylbenzenesulfonate according to a mass ratio of 9:1, add deionized water, seal, heat and stir at 55°C for 24 hours to disperse uniformly to obtain a composite slurry.

[0054] Using the solution casting method, the composite slurry was placed in a polytetrafluoroethylene mold and dried at room temperature for 48 hours. The 14mm original sheet was dried in a vacuum oven at 55°C for 24h to obtain a polymer electrolyte membrane.

[0055] The CR2032 solid-state battery was assembled, with stainless steel electrodes on both sides, and the conductivity was tested. The results are shown in Table 1.

Embodiment 2

[0057] After diluting sodium dodecylbenzene sulfonate with water, first perform proton exchange with hydrochloric acid, and then add lithium hydroxide to prepare a neutral solution to obtain lithium dodecyl benzene sulfonate with a solid content of about 10%.

[0058] Mix PEO with a molecular weight of 200,000 g / mol and lithium dodecylbenzenesulfonate in a mass ratio of 49:1, add deionized water, seal, heat and stir at 55°C for 24 hours to disperse evenly; add LiTFSI lithium salt, and the oxygen-to-lithium ratio is 15: 1, to obtain a composite slurry.

[0059] Using the solution casting method, the composite slurry was placed in a polytetrafluoroethylene mold and dried at room temperature for 48 hours. The 14mm original sheet was dried in a vacuum oven at 55°C for 24h to obtain a polymer electrolyte membrane.

[0060] The CR2032 solid-state battery was assembled, with stainless steel electrodes on both sides, and the conductivity was tested. The results are shown in Table 1....

Embodiment 3

[0068] After diluting sodium dodecylbenzene sulfonate with water, first perform proton exchange with hydrochloric acid, and then add lithium hydroxide to prepare a neutral solution to obtain lithium dodecyl benzene sulfonate with a solid content of about 10%.

[0069] Mix PEO with a molecular weight of 300,000 g / mol and lithium dodecyl benzene sulfonate at a mass ratio of 19:1, add deionized water, seal, heat and stir at 55°C for 24 hours to disperse evenly; add LiTFSI lithium salt, and the oxygen-to-lithium ratio is 15: 1, to obtain a composite slurry.

[0070] Using the solution casting method, the composite slurry was placed in a polytetrafluoroethylene mold. After drying at room temperature for 48 hours, it was shot into an original sheet of φ14mm and dried in a vacuum oven at 55°C for 24 hours to obtain a polymer electrolyte membrane.

[0071] The CR2032 solid-state battery was assembled, with stainless steel electrodes on both sides, and the conductivity was tested. The ...

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Abstract

The present invention provides a polymer electrolyte membrane and a solid-state battery. The polymer electrolyte membrane is prepared by using the following method: mixing polyoxyethylene, a surfactant, and water, performing heating, and then mixing with lithium salt, to obtain a composite sizing agent, wherein the surfactant is selected one or more of aliphatic alcohol polyoxyethylene lithium ether sulfuric acid, alkyl group lithium phosphate, alkyl group lithium sulfate, alkyl group lithium benzene sulfonic acid, alkyl group lithium naphthalene sulfonic acid, and alkyl group lithium glycerylether sulfoacid; and forming a film for the composite sizing agent, to obtain the polymer electrolyte membrane. According to the polymer electrolyte membrane and solid-state battery, nano size micelle is formed by using a mutual effect of the surfactant and the polyoxyethylene matrix, an order of a polymer chain in PEO is disorganized, crystalline of the PEO is reduced, and an ionic conductivityof a battery prepared by using the electrolyte membrane is improved. In addition, the nano size micelle formed by using the mutual effect of the surfactant and the PEO matrix can disperse uniformly and exist stably, and helps to effectively form a polymer electrolyte membrane that is uniform in components and controllable in thickness.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a polymer electrolyte membrane and a solid-state battery. Background technique [0002] In widely used liquid lithium-ion batteries, due to the use of volatile, flammable and explosive organic electrolytes, they face safety risks such as leakage and flammability. Therefore, the development of all-solid-state batteries based on solid-state electrolytes is the fundamental solution to the above safety hazards. Strategy. Solid-state electrolytes include inorganic solid-state electrolytes and polymer solid-state electrolytes. Compared with liquid electrolytes, solid-state electrolytes have the advantages of improving safety performance and inhibiting lithium dendrites, and polymer electrolytes have the advantages of flexibility and easy operation. Among them, PEO polymer electrolytes are the most widely used due to their low toxicity, low glass transition temperature, good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCH01M10/0525H01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 朱冠楠黄杰张程孙亮李久铭洪晓恒冯奇李泓俞会根
Owner SAIC MOTOR
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