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Preparing of composite polymer modified diaphragm containing shape selectivity molecular sieve filling agent

A composite polymer and molecular sieve technology, applied in electrical components, circuits, battery pack components, etc., can solve problems such as increased production costs, poor mechanical properties of membranes, and complex procedures.

Inactive Publication Date: 2009-10-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need to extract the plasticizer, impurities will be introduced and the mechanical properties of the film will be deteriorated
The complex process makes the production cost greatly increased

Method used

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  • Preparing of composite polymer modified diaphragm containing shape selectivity molecular sieve filling agent
  • Preparing of composite polymer modified diaphragm containing shape selectivity molecular sieve filling agent
  • Preparing of composite polymer modified diaphragm containing shape selectivity molecular sieve filling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add polyethylene and Aqua keep 4S water-absorbent resin mixed raw materials with a dosage ratio of 20% into the extruder, melt and extrude at 150°C, and roll into a flat film at 60°C after cooling , Send the flat film to the unidirectional stretching machine to stretch at 0.3 m / min. Disperse 5% ZSM-5 molecular sieve filler in 5ml acetone solvent, add 95% polyoxyethylene polymer to dissolve into a gel-like composite polymer. The composite polymer is coated on the surface of the modified matrix membrane. The solvent was evaporated at 80°C to remove the solvent, and then vacuum-dried in a drying oven to obtain a composite polymer modified separator.

Embodiment 2～4

[0027] It was prepared by the same method as in Example 1, except that the ratios of polyethylene and Aqua keep 4 water-absorbing resin were different, and the water-absorbing resin accounted for 30%, 40%, and 50% respectively. Under the same conditions, a composite polymer modified diaphragm was obtained.

Embodiment 5

[0029] The ratio of the amount of polyethylene to the water-absorbing resin was fixed, and stretched at 5 m / min to obtain the modified matrix film. Disperse 10% ZSM-5 molecular sieve filler in 5ml acetone solvent, add 90% polyoxyethylene polymer to dissolve into a gel-like composite polymer. The composite polymer is coated on the surface of the modified matrix membrane. The solvent was removed by thermal evaporation at 100°C, and then vacuum-dried in a drying oven to obtain a composite polymer modified diaphragm.

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Abstract

Polymer modified diaphragm preparation, using polyolefin as principle material to prepare modified matrix membrane, the polyolefin material is added with 20-80% hydroscopicity resin, using the T-shape membrane method single screw rod of the melting express method to expressing shape and getting the polyolefin modified membrane. Then coating the composite polymer material containing shape selectivity molecular sieve filling agent onto the polyolefin modified matrix membrane wo prepare composite polymer modified membrane. The hydroscopicity resin used not only improves pore size distribution in diaphragm and the hydrophilic group improves diaphragm wettability and interface property, the shape selectivity molecular sieve used can not only make acid-base reaction with O via louis acid site on the surface, reducing the force between them and the L1 [+], and make the anion with relative larger radius difficult to transmit via pipes because of regulartwo-dimension cross pore, and improving migration volume of the L1 [+]. The method assures mechanical property of the diaphragm and improves interface property of the diaphragm, and at the moment of strengthening membrane fluid absorption capacity and improving electric conductivity, avoiding the extraction step.

Description

technical field [0001] The invention relates to a preparation method of a polymer lithium-ion battery composite polymer modified diaphragm Background technique [0002] Due to its excellent electrical performance, pollution-free, and good safety performance, the green secondary lithium-ion battery has developed rapidly and has become a hot spot in the research of new power supply technology in recent years. A common lithium-ion secondary battery consists of positive / negative electrode materials, electrolyte, separator, and battery casing packaging materials. The separator is an important part of the liquid lithium-ion secondary battery. It plays a role in preventing the short circuit of the positive / negative electrodes in the battery, and at the same time provides the ion transport channel during the charging and discharging process. Its performance determines the interface structure, internal resistance, etc. of the battery. , directly affects the capacity, cycle performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B29C69/02H01M50/403
CPCY02E60/12Y02E60/10
Inventor 王太宏黄睿陈立宝罗雨王耀玲周钢
Owner HUNAN UNIV