Ionic conductive polymer diaphragm for lithium-sulphur battery, and preparation method and application thereof

An ionic polymer and ion-conducting technology, applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of poor mechanical properties, poor flexibility, high price, etc., and achieve low lattice energy and fast conduction , reducing the attenuation effect

Inactive Publication Date: 2016-08-10
NINGBO LIANHUA ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic solid-state electrolytes have many advantages, they still have the following problems to be solved in summary: higher cost, more expensive; poor mechanical properties, more brittle when the thickness is thin; poor flexibility, etc.

Method used

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  • Ionic conductive polymer diaphragm for lithium-sulphur battery, and preparation method and application thereof
  • Ionic conductive polymer diaphragm for lithium-sulphur battery, and preparation method and application thereof
  • Ionic conductive polymer diaphragm for lithium-sulphur battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of the ion-conducting polymer diaphragm of the present invention comprises the following steps:

[0032] Step (1): dissolving the ion-conducting polymer in a solvent to form an ion-conducting polymer solution with a certain mass fraction.

[0033] Step (2): Put the battery diaphragm into the ion-conducting polymer solution, take it out after 10 minutes, absorb the excess solution, and dry it in an oven at high temperature for 12-24 hours to obtain the ion-conducting polymer diaphragm.

[0034] The solvent in step (1) includes one or more mixtures of N-methylpyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide, and N,N-dimethylacetamide.

[0035]The mass fraction described in step 1 is 1-30%.

[0036] The high temperature in step 2 is 50-100°C.

[0037] The ion-conductive polymer diaphragm prepared by the above method is mainly composed of a battery diaphragm and an ion-conductive polymer layer attached to the surface of the battery diaphragm. ...

Embodiment 1

[0054] In this example, the main chain is polyether ether ketone, and the side chain is a fluorine-containing sulfonimide-based ionomer. The structural formula is as follows:

[0055]

[0056] The preparation method of the ion-conducting polymer diaphragm is as follows:

[0057] Take 1 g of the ionic polymer (SPEEK-PFSI-Li) and add it to 24 g of N-methylpyrrolidone, stir for 5 hours, and make a SPEEK-PFSI-Li solution with a mass ratio of 4%; immerse the PP diaphragm in the solution for 10 minutes Finally, take it out, absorb the excess solution with filter paper, put the diaphragm into a horizontal tetrafluoroethylene petri dish, and put it into a drying oven at 60° C. to dry for 20 hours to obtain the required ion-conductive polymer diaphragm.

[0058] figure 1 It is the impedance diagram before and after polarization of the prepared ion-conducting polymer membrane through the "non-blocking" type electrode test at room temperature. Through calculation, it can be conclude...

Embodiment 2

[0060] In this example, the structure of the side chain is the same as that of Example 1, except that the main chain adopts a polysulfone structure, and the preparation process is basically the same.

[0061] Take 1 g of the ionic polymer (PSU-PFSI-Li) and add it to 24 g of N-methylpyrrolidone, stir for 5 hours to form a 4% PSU-PFSI-Li solution; immerse the PP diaphragm in the solution for 10 minutes Finally, take it out, absorb the excess solution with filter paper, put the diaphragm into a horizontal tetrafluoroethylene petri dish, and put it into a drying oven at 60° C. to dry for 20 hours to obtain the required ion-conductive polymer diaphragm.

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Abstract

The invention discloses an ionic conductive polymer diaphragm for a lithium-sulphur battery, and a preparation method and application thereof. The diaphragm is mainly composed of a battery diaphragm and an ionic conductive polymer layer attached to the surface of the battery diaphragm. The diaphragm disclosed by the invention has lithium ion permselectivity and has good blocking effect to multi-sulphur anions; the lithium ion mobility of the polymer diaphragm is close to 1; the shuttling effect of the lithium-sulphur battery in a cyclic process can be effectively reduced; attenuation of the lithium-sulphur battery is inhibited; simultaneously, the effect of reducing side reaction due to shuttling of multi-sulphur anions can be realized; impedance is prevented from being further increased; and an effective method is provided for application of the lithium-sulphur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and relates to an ion-conductive polymer diaphragm for lithium-sulfur batteries, a preparation method and application thereof. Background technique [0002] With the improvement of people's requirements for electronic consumer goods and electric vehicles, it is urgent to develop a battery system with high energy density. In order to reduce the weight and volume of lithium-ion batteries, many methods have been reported to increase the energy density of batteries. However, the positive and negative electrodes of the classic rocking-chair battery are all structures that can embed lithium ions, and the capacity is limited by its inherent energy density, making it difficult to further increase. Secondly, LiCoO in current lithium-ion batteries 2 Or the price of other transition metals used is relatively expensive, so the cost is relatively high in large-scale applications. In order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M2/14H01M2/16H01M50/403H01M50/414H01M50/497
CPCH01M10/052H01M50/40H01M50/409H01M50/403H01M50/411Y02E60/10
Inventor 薛立新秦德君温乐乐聂锋王健李丹
Owner NINGBO LIANHUA ENVIRONMENTAL SCI & TECH
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