CN111584822A

CN111584822A - Device and method for manufacturing rate type lithium sub-cathode

Info

Publication number: CN111584822A
Application number: CN202010300564.2A
Authority: CN
Inventors: 夏润; 周敬; 柳鸣翔; 阮红林
Original assignee: Wuhan Haocheng Energy Resources Technology Co ltd
Current assignee: Wuhan Haocheng Energy Resources Technology Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-08-25

Abstract

The invention discloses a device for manufacturing a multiplying power type lithium sub-cathode, and relates to a device for manufacturing a battery cathode. The device comprises a conveyor belt and a roller press positioned in the middle of the conveyor belt; the conveyor belt is provided with absorbent paper. The manufacturing method of the invention is simpler, can completely realize continuous production, and saves labor cost. The invention discloses a manufacturing method of the multiplying power type lithium sub-cathode manufacturing device.

Description

Device and method for manufacturing rate type lithium sub-cathode

Technical Field

The invention relates to a battery cathode manufacturing device, in particular to a multiplying power type lithium sub-cathode manufacturing device. The invention also relates to a manufacturing method of the device for manufacturing the rate type lithium sub-cathode.

Background

The lithium sub-battery is a high-specific energy battery in the current chemical power supply, has the advantages of high working voltage, long storage life, wide working temperature range, convenience in use and maintenance, strong adaptability and the like, has wide application in national economy represented by the national defense field in more than ten years, can realize the characteristic of high-rate output, and has great application value in high-power-consumption output equipment.

In order to satisfy the rate discharge characteristics, the lithium sub-cathode is particularly critical to manufacture. The traditional method for manufacturing the cathode of the lithium sub-power battery is to roll the mixed powder material into a double-roller machine for multiple times to form a membrane, and the membrane is adhered together by a special adhesive after being dried, which has great disadvantages: firstly, the physical characteristics of each material have been destroyed in many times of roll-in, secondly the binder pastes not good can influence the internal resistance of battery, and the binder is mostly the organic matter, can react with electrolyte, and final multiplying power performance descends.

Therefore, it is necessary to develop a device for manufacturing a rate type lithium sub-cathode.

Disclosure of Invention

The first purpose of the present invention is to overcome the above-mentioned shortcomings of the background art, and to provide a device for manufacturing a rate type lithium sub-cathode.

The second objective of the present invention is to provide a method for manufacturing the rate type lithium sub-cathode manufacturing device, so as to overcome the disadvantages of the background art.

In order to achieve the first object, the technical scheme of the invention is as follows: multiplying power type lithium sub-cathode preparation facilities, its characterized in that: comprises a conveyor belt and a roller press positioned in the middle of the conveyor belt; the conveying belt is provided with absorbent paper; the water absorption paper is provided with a nickel net.

In order to achieve the second object, the invention has the technical scheme that: the manufacturing method of the multiplying power type lithium sub-cathode manufacturing device is characterized by comprising the following steps:

step 1: mixing acetylene black and a conductive agent to obtain a dry material; adding isopropanol and deionized water into the dry material for wet mixing to obtain a wet material; adding the polytetrafluoroethylene emulsion into the mixed wet material, and continuously stirring to obtain powder;

step 2: scattering powder on a nickel net, starting a conveyor belt, and finishing the molding of a first surface membrane by the powder, absorbent paper and the nickel net through a roller press;

and step 3: after the first face membrane is turned over, repeating the step 2 to complete the forming of the second face membrane; and heating and fiberizing the second face membrane to complete the cathode sheet.

In the technical scheme, in the step 1, the weight ratio of the acetylene black, the conductive agent, the isopropanol, the ionized water and the polytetrafluoroethylene emulsion is 10:0.5:20:20: 0.5.

In the above technical scheme, in step 3, the temperature for heating and fiberizing the second facial film sheet is 300 ℃ and the time is 1 hour.

Compared with the prior art, the invention has the following advantages:

1) the manufacturing method of the invention is simpler, can completely realize continuous production, and saves labor cost.

2) The cathode forming method is more scientific and reasonable, the cathode is formed only by one-time rolling, the material damage degree is greatly reduced, and the rate discharge performance is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a schematic view of the structure of the cathode during double-sided rolling

FIG. 3 is a schematic view of the cathode film forming process of the present invention

FIG. 4 is a schematic diagram of a discharge curve of a battery according to the present invention

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.

With reference to the accompanying drawings: the device for manufacturing the multiplying power type lithium sub-cathode comprises a conveyor belt 1 and a roller press 2 positioned in the middle of the conveyor belt 1; the conveyor belt 1 is provided with absorbent paper 3; the water absorption paper 3 is provided with a nickel net 4.

The manufacturing method of the multiplying power type lithium sub-cathode manufacturing device comprises the following steps:

step 1: adding acetylene black and a conductive agent into a stirrer to mix dry materials to obtain the dry materials, wherein the stirring speed is 30r/min, and the stirring time is 1 hour; adding isopropanol and deionized water into the dry material for wet mixing to obtain a wet material, wherein the stirring speed is 15r/min, and the stirring time is 30 minutes; adding the polytetrafluoroethylene emulsion into the mixed wet material, and continuously stirring to obtain powder 6, wherein the stirring speed is 10r/min, and the stirring time is 10 minutes;

step 2: scattering powder 6 on the nickel screen 4, starting a conveyor belt, and finishing the molding of a first-surface membrane 5 by the powder 6, absorbent paper 3 and the nickel screen 4 through a roller press 2, wherein the thickness of the membrane is 1 mm; as shown in fig. 1;

and step 3: adjusting the gap of the roller press 2, turning over the first-side membrane 5, and repeating the step 2 to complete the molding of the second-side membrane, wherein the thickness of the molded membrane is 1mm, as shown in fig. 2; heating and fiberizing the second surface membrane to complete the cathode sheet 9;

and 4, slitting the cathode sheet, and slitting the cathode sheet into different pole piece sizes according to batteries of different models, as shown in fig. 3.

In the step 1, the weight ratio of the acetylene black, the conductive agent, the isopropanol, the ionized water and the polytetrafluoroethylene emulsion is 10:0.5:20:20: 0.5.

In step 3, the second face membrane is put into an oven or a drying room to be heated and fiberized at the temperature of 300 ℃ for 1 hour.

In practical use, taking ER34615M cell as an example, the performance test chart of the cell made of the invention and the conventional cathode is discharged at 0.2C, where 7 is the discharge curve of the conventional process and 8 is the discharge curve of the invention, as shown in fig. 4.

Other parts not described belong to the prior art.

Claims

1. Multiplying power type lithium sub-cathode preparation facilities, its characterized in that: comprises a conveyor belt (1) and a roller press (2) positioned in the middle of the conveyor belt (1); the conveyor belt (1) is provided with absorbent paper (3); the water absorption paper (3) is provided with a nickel net (4).

2. The method for manufacturing a device for manufacturing a rate type lithium sub-cathode according to claim 1, comprising the steps of:

step 1: mixing acetylene black and a conductive agent to obtain a dry material; adding isopropanol and deionized water into the dry material for wet mixing to obtain a wet material; adding the polytetrafluoroethylene emulsion into the mixed wet material, and continuously stirring to obtain powder (6);

step 2: scattering powder (6) on the nickel net (4), starting a conveyor belt, and finishing the molding of the first surface membrane (5) by the powder (6), the absorbent paper (3) and the nickel net (4) through a roller press (2);

and step 3: after the first face membrane (5) is turned over, repeating the step 2 to complete the forming of the second face membrane; and heating and fiberizing the second face membrane to complete the cathode sheet (9).

3. The method for manufacturing a device for manufacturing a rate lithium sub-cathode according to claim 2, wherein in the step 1, the weight ratio of the acetylene black, the conductive agent, the isopropyl alcohol, the ionized water and the polytetrafluoroethylene emulsion is 10:0.5:20:20: 0.5.

4. The method of claim 2 or 3, wherein the second face film is heated and fiberized at 300 ℃ for 1 hour in step 3.