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Device and method for efficiently reducing volatilization of extractant at low cost

An extraction agent, low-cost technology, applied in the direction of liquid solution solvent extraction, etc., can solve the problems of increasing the recovery and rectification workload, inconvenient operation of steel plate handling, and impact on the performance of the diaphragm, achieving low-cost and high-efficiency reduction of extraction agent volatilization, preventing Physical changes and chemical reactions, the effect of improving coverage

Inactive Publication Date: 2019-06-18
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional process, steel plate covering or liquid sealing is mainly used to reduce the volatilization of methylene chloride. However, when steel plate covering is used, it is inconvenient to take and place the steel plate, and liquid sealing is more sensitive to temperature, which is easy to damage the diaphragm. performance impact
For example, the patent literature (publication number CN 107252572 A) discloses a water-sealed lithium-ion battery diaphragm extraction process, which can reduce the volatilization of dichloromethane by adding water to the extraction equipment, but it still has improvements For example, from the perspective of the recovery and reuse of the extractant, the liquid seal method increases the workload of recovery rectification, and the diaphragm travels back and forth in the extractant, water and air, and the change of temperature may affect the performance of the diaphragm. Such as edge shrinkage, wrinkling, etc.

Method used

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  • Device and method for efficiently reducing volatilization of extractant at low cost
  • Device and method for efficiently reducing volatilization of extractant at low cost

Examples

Experimental program
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Embodiment 1

[0041] like figure 1 As shown, a kind of efficient method for reducing the volatilization of the extractant in the present embodiment is to directly put polymer spheres of different radii into the storage tank of the extractant (i.e. the liquid storage barrel 1, which is provided with an inlet for the extraction agent) In the liquid pipe 2 and the liquid outlet pipe 3), make it naturally cover the liquid surface of the extractant. Among them, the number of pellets is determined according to the radius of the liquid storage tank 1, and the material of the polymer pellets is determined according to the type of extractant in the storage tank, which can be one or more of polypropylene, low-density polyethylene, PTFE, etc. Several types, the radius of the ball is between 10cm and 0.2cm, the polymer ball can be hollow, solid or two, so that the ball can completely float on the liquid surface, and the liquid surface coverage can reach 95%. and above. On the one hand, this embodimen...

Embodiment 2

[0045] like figure 2 As shown, a method for efficiently reducing the volatilization of the extraction agent in this embodiment is to directly put polyolefin spheres of different radii into the extraction tank 6 (transportation and guidance are carried out by the transport roller 8 during extraction by the diaphragm 7 ). According to the size of extraction tank 6, determine the quantity that needs bead, determine the material of polymer bead according to the difference of extraction agent kind, can be polypropylene, low-density polyethylene, one or several in PTFE, make extraction tank The contact surface between the liquid and the gas is completely covered by small balls, and the radius of the small balls is between 10cm and 0.2cm; the polymer small balls can be either hollow or solid, so that the small balls can completely float in the liquid On the surface, the coverage of the liquid surface can reach 95% and above. This embodiment can reduce the volatilization of the extr...

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Abstract

The invention discloses a device and method for efficiently reducing volatilization of an extractant at low cost, and belongs to the technical field of battery diaphragm production equipment. The invention discloses the device for efficiently reducing the volatilization of the extractant at the low cost. The device comprises one or more polymer spheres with different radiuses, wherein the polymerspheres cover the liquid level of the extractant, and the polymer spheres are made of a polyolefin material which is particularly preferably a combination of any one or more of PP, PE and PTFE. According to the method for efficiently reducing the volatilization of the extractant at the low cost, one or more polymer spheres with the different radiuses are placed into an extractant storage tank or an extraction tank, so that the polymer spheres naturally float on the liquid level of the extractant. By adopting the technical scheme of the invention, the volatilization of the extractant in processes of transportation, storage and extraction can be effectively reduced, and the extraction effect and quality of an obtained diaphragm can be further ensured.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm production equipment, and more specifically relates to a low-cost and high-efficiency device and method for reducing the volatilization of an extraction agent. Background technique [0002] As a high-energy power source, lithium-ion batteries have been widely used in portable electronic devices, electric tools, electric vehicles, energy storage power stations and other fields. Lithium-ion batteries are composed of a positive electrode, a negative electrode, an electrolyte, and a separator. Among them, the positive electrode material is composed of lithium-containing transition metal oxides. Commonly used materials include lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate; the negative electrode The material can be graphite, graphitized carbon material, modified graphite, graphitized mesocarbon particles, and most of the electrolyte is made of lithium hex...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 晋沛沛刘世凯邓豪戴华斌王杰盖小厂
Owner 安徽金力新能源有限公司
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