Method for cleaning type screw extrusion preparing of lithium battery polymer electrolyte membrane

A technology of screw extrusion and electrolyte membrane, applied in electrolytes, secondary batteries, circuits, etc., can solve the problems of high cost, environmental pollution, unsatisfactory electrical conductivity and mechanical properties of solid electrolyte membranes, and achieve low cost, high electrical conductivity, etc. Good, process clean and pollution-free effect

Active Publication Date: 2019-07-05
湖北奇见新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that in the preparation method of lithium battery polymer solid electrolyte membrane in the prior art, processes such as coating need to use a large amount of solvent dispersion pulping, which is easy to cause environmental pollution, and the cost is high. In addition, the conductivity and mechanical properties of the traditional solid electrolyte membrane performance flaws

Method used

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  • Method for cleaning type screw extrusion preparing of lithium battery polymer electrolyte membrane

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Comparison scheme
Effect test

Embodiment 1

[0022] 56kg of polyvinylidene fluoride, 11kg of polyethylene oxide, 12kg of lithium hexafluorophosphate (LiPF 6 ), 7kg of pomegranate-type lanthanum-zirconium oxide electrolyte, 8kg of nano-titanium oxide, and 6kg of urea-plasticized cotton fibers were mixed, and then added to a vortex jet mill for interface modification and fine compounding under the impact of strong airflow. The spindle speed of the cyclone airflow pulverizer is 4300r / min, the strong air flow rate is 460m / s, and the time is 34min to prepare the compound; then 66kg compound and 34kg polyurethane elastomer are mixed evenly, and then the obtained mixed material is sent into In the twin-screw extruder, it is heated to a temperature of 70-90°C, and is continuously sheared and mixed at a speed of 300-500r / min to disperse evenly. The twin-screw extruder is equipped with a sheet die, and the mixture is passed through the die. The head is formed into a sheet, and then continuously stretched into thin sheets through r...

Embodiment 2

[0028] 60kg polyvinylidene fluoride, 9kg polyethylene oxide, 11kg lithium hexafluorophosphate (LiPF 6 ), 6kg Li 2 S-P 2 S 5 Sulfide electrolyte, 8kg nano-alumina, 6kg urea plasticized kapok fibers are mixed, then added to the vortex jet mill, and the interface is modified and refined under the impact of strong air flow. The spindle speed of the vortex jet mill is 4100r / min, the strong air flow rate is 420m / s, and the time is 38min to prepare the compound; then 62kg compound and 38kg polyester elastomer are mixed evenly, and then the obtained mixture is sent into the twin-screw extruder, Heat to a temperature of 75°C, and carry out continuous shear mixing at a speed of 350r / min to disperse evenly. The twin-screw extruder is equipped with a sheet die, and the mixed material is formed into a sheet through the die, and then continuously passed through roller calendering and stretching Form into thin sheets, the roller temperature of roller calendering is 42 ℃, the roller speed ...

Embodiment 3

[0031] 54kg of polyvinylidene fluoride, 11kg of polyethylene oxide, 13kg of lithium hexafluorophosphate (LiPF 6 ), 7kg of pomegranate-type lanthanum-zirconium oxide electrolyte, 9kg of nano-zinc oxide, and 7kg of urea-plasticized flax fiber were mixed, and then added to a vortex airflow mill for interface modification and fine compounding under the impact of strong airflow. The rotational speed of the main shaft of the cyclone airflow pulverizer is 4400r / min, the strong air flow rate is 480m / s, and the time is 33min to prepare the compound; then 68kg of the compound and 32kg of polyurethane elastomer are mixed evenly, and then the obtained mixed material is sent into In the twin-screw extruder, heat it to a temperature of 85°C, and carry out continuous shearing and mixing at a speed of 450r / min to disperse evenly. The twin-screw extruder is equipped with a sheet die, and the mixed material is formed into a sheet through the die. Then it is stretched into thin sheets by roller ...

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Abstract

The invention belongs to the technical field of lithium battery electrolyte membranes, and provides a method for cleaning type screw extrusion preparing of a lithium battery polymer electrolyte membrane. The method comprises the steps that after polyvinylidene fluoride, polyoxyethylene, lithium salt, a fast ion conductor, nano inorganic filler and plasticized plant fiber are mixed, strong airflowis used for impacts, a compound is prepared, and after the compound and elastomer are mixed, the mixture is conveyed into a double-screw extruder to be subjected to continuous shearing, mixing and scattering, die head sheet forming, roller calendering sheet forming, liquid nitrogen quenching and annealing treatment are continuously conducted, and the lithium battery composite polymer electrolyte membrane is prepared. Compared with a traditional method, the polymer composite electrolyte membrane prepared through the method has a large number of lithium ion transmission channels, conductivity isgood, meanwhile, good mechanical performance and heat resistance are achieved, meanwhile, the preparing process is clean and free of pollution, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrolyte membranes, and provides a method for preparing lithium battery polymer electrolyte membranes by clean screw extrusion. Background technique [0002] With the rapid development of the application of lithium batteries in electric vehicles and other fields, the problems of their commercialization have gradually been exposed. Because lithium batteries generally contain volatile and flammable liquid organic compounds in the traditional electrolytic solution, which is accompanied by high temperature during the charging and discharging process of the battery, there are safety hazards such as fire and explosion, especially in the case of overcharge, overdischarge, short circuit, etc. Under the situation, hidden dangers are more likely to appear. On the other hand, the electrolyte takes up a lot of battery weight, resulting in a low overall energy density of the finished battery and li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/025B29C48/08B29C35/16B29C71/02H01M10/056H01M10/0525C08L27/16C08L71/02C08L1/02C08L97/02C08K3/32C08K3/22
CPCB29C35/16B29C71/02B29C2035/165B29C2071/022C08K2003/2227C08K2003/2241C08K2003/2296C08K2003/324C08K2201/011C08L27/16C08L2203/20C08L2205/03C08L2205/16H01M10/0525H01M10/056H01M2300/0091C08L71/02C08L1/02C08K3/32C08K3/22C08L97/02Y02E60/10
Inventor 陈庆曾军堂
Owner 湖北奇见新材料有限公司
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