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Barrier membrane and preparation method thereof and secondary battery comprising barrier membrane

A secondary battery and diaphragm technology, which is applied in the field of secondary battery production, can solve the problems of secondary battery performance degradation, achieve the effects of improving battery performance, solving battery capacity and current efficiency reduction, and inhibiting the "shuttle" effect

Active Publication Date: 2016-07-20
杭州聚力氢能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to provide a barrier separator, its preparation method and a secondary battery including the same, so as to solve the problem in the prior art that the performance of the secondary battery with a sulfur positive electrode is reduced due to the "shuttle" effect

Method used

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  • Barrier membrane and preparation method thereof and secondary battery comprising barrier membrane
  • Barrier membrane and preparation method thereof and secondary battery comprising barrier membrane
  • Barrier membrane and preparation method thereof and secondary battery comprising barrier membrane

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preparation example Construction

[0089] In addition, the present invention also provides a method for preparing a barrier diaphragm, which includes the following steps: preparing one or G layers of single-ion polymer electrolyte membrane, and pressing to form a barrier diaphragm; wherein G≥2.

[0090] The barrier diaphragm prepared by the above method of the present invention, the single-ion polymer electrolyte membrane has selective passage characteristics for cations, can hinder the electromigration of polysulfide anions in the electrolyte, and block them on the side close to the sulfur positive electrode. Under the joint action of the above adsorption and blocking, polysulfides and polysulfide anions can be effectively prevented from moving to the lithium negative electrode or the sodium negative electrode. Therefore, it is beneficial to suppress the "shuttle effect" in the secondary battery with sulfur as the positive electrode, and improve its battery performance. In the actual preparation process, those...

Embodiment 1

[0106] Prepare the barrier membrane:

[0107] With a specific surface area of ​​1264m 2 / g of commercial carbon black BP2000 as a conductive adsorption filler, with polytetrafluoroethylene as a polymer binder. The conductive adsorption filler is dissolved in the polymer binder emulsion (the mass ratio of the conductive adsorption filler to the polymer binder is 4:1) to form an adsorption emulsion. Then adopt isopropanol to demulsify, and the filtrate is pressed (pressure is 1Mpa) into the film of 0.6mm on the roller machine as the first adsorption layer and the second adsorption layer;

[0108] Perform lithium ion exchange treatment on the Nafion membrane to obtain a single-ion polymer electrolyte membrane;

[0109] The first adsorption layer, the single-ion polymer electrolyte membrane and the second adsorption layer of the same size were sequentially stacked, and then pressed on a roller machine with a pressure of 3Mpa to obtain a barrier diaphragm.

[0110] Preparation o...

Embodiment 2

[0115] Prepare the barrier membrane:

[0116] With a specific surface area of ​​1264m 2 / g of "pearl black" (English name blackpearl) BP2000 is used as a conductive adsorption filler, with polytetrafluoroethylene as a polymer binder. The conductive adsorption filler is dissolved in the polymer binder emulsion (the mass ratio of the conductive adsorption filler to the polymer binder is 3:1) to form an adsorption emulsion. Then adopt isopropanol to demulsify, and the filtrate is pressed (pressure is 3Mpa) into the film of 0.1mm on the roller machine as the first adsorption layer and the second adsorption layer;

[0117] preparation containing sp 3 Polymer lithium salt of hybrid boron anion, using hexamethyldisilazane to carry out silylation treatment on 2,5-dihydroxyterephthalic acid to obtain methylated product; Oxyboron lithium is polymerized to obtain the sp-containing structure of formula I 3 Polymeric Lithium Salts of Hybridized Boron Anions. 0.6g containing sp 3 The ...

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Abstract

The invention discloses a barrier membrane and a preparation method thereof and a secondary battery comprising the barrier membrane. The barrier membrane comprises one or G layers of single-ion polymer electrolyte membranes, wherein G is greater than or equal to 2; the single-ion polymer electrolyte membranes in the barrier membrane can block electromigration of soluble multi-sulfur anions generated by the secondary battery in the discharge process and block the soluble multi-sulfur anions at one side close to a sulfur positive electrode due to selective through characteristics for cations, so that these multi-sulfur anions are prevented from diffusing to the surface of a negative electrode (for example, a lithium or sodium negative electrode) for reaction; and the problem of reduction of battery capacity and current efficiency of the secondary battery can be solved. In a word, after the barrier membrane is added between the sulfur positive electrode of the secondary battery and a porous membrane, the 'shuttle' effect of polysulfide can be effectively suppressed under the blocking effect of the barrier membrane on the multi-sulfur anions, so that the battery performance of the secondary battery with the sulfur positive electrode can be improved.

Description

technical field [0001] The invention relates to the field of secondary battery production, in particular to a barrier diaphragm, a preparation method thereof and a secondary battery comprising the same. Background technique [0002] In the 1990s, Sony first introduced lithium-ion batteries. After decades of development, the specific capacity, specific power and safety of lithium-ion batteries have been greatly developed. However, the rapid development of new handheld terminal equipment, electric vehicles, large-scale energy storage and other fields has put forward new requirements for the existing energy storage system: higher energy density, higher power density, longer cycle life , cheap and higher security. The existing lithium-ion battery technology is based on the reversible intercalation and extraction of lithium ions in the metal oxide cathode material, because its intercalation and extraction potential is higher than that of Li + / Li pair, so it can be assembled in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/05H01M50/403H01M50/411H01M50/449
CPCY02E60/10
Inventor 程寒松孙玉宝曾丹黎李改赖远初李万清
Owner 杭州聚力氢能科技有限公司
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