Carbon electrode, method for forming same, and use thereof

A molding method and carbon electrode technology, applied in electrode molding, primary battery electrodes, positive electrodes, etc., can solve the problems of safety risks in the preparation process, insufficient uniformity of binder dispersion, and complicated operations in the preparation process, and achieve adsorption The effect of improving the ability and ion conductivity, stabilizing the structure, and improving the surface activity

Pending Publication Date: 2020-01-14
EVE ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It comprises the following steps: under the condition that the room temperature is 25±5°C and the humidity is 50%±20%, adding said weight of acetylene black into a blender for stirring; adding said weight of polytetrafluoroethylene emulsion, isopropyl Alcohol and deionized water are mixed to obtain a mixed solution, and half of the weight of the mixed solution is added to the blender, stirred and mixed to obtain a mixed powder; after stirring for 15 minutes, about 20% of the total amount of mixed solution is released from the outlet at the bottom of the blender Powder: Add the metal powder of the stated weight into the blender evenly from the inlet of the blender, then add the mixed powder in step 3 from the inlet of the blender, and finally add the remaining half of the weight of the blender liquid; mix again and stir for 15 minutes to complete the entire kneading process. This solution uses water and isopropanol as solvents, and the operation process is complicated, and there are safety risks in the preparation process
[0005] CN107910497A discloses a method for preparing lithium thionyl chloride power type battery positive electrode, including steps: 1) pretreatment of powder; mixing materials into semi-dry and wet materials and stirring evenly; semi-dry and wet materials enter the sieve aperture with an aperture of 0.5-1.5mm Extrude the extruder to obtain strips with a length of 1-2cm; the strips enter the centrifugal pellet machine to obtain fine pellets with a particle size of 0.5-1.5mm; the fine pellets are put into vacuum drying for 8 -10h; 2) The fine pellets are online; the obtained dried fine pellets are crushed into fine powder; the fine powder is uniformly mixed with an aqueous solvent to obtain a semi-dry powder; the nickel mesh on the semi-dry powder is vacuum-dried and fibrous; 3) Positive electrode forming; rolling with a rolling mill to make a positive electrode body of required thickness; the solvents used in the preparation process of this scheme are ethanol and water, the preparation process is complicated, and the binder in the product is uniformly dispersed in acetylene black Insufficient, and there are potential safety hazards in the preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Carbon electrode forming method:

[0044] (1) The polytetrafluoroethylene emulsion is added in the isoparaffin solvent, and dispersed evenly under stirring under the stirrer to obtain a mixed solution, and the isoparaffin solvent is Isopar H type isoparaffin solvent oil;

[0045] (2) Disperse the acetylene black and the conductive additive evenly in a high-speed mixing granulator, add the mixed solution in step (1) during the dispersion process, take it out after stirring for 3min, and obtain the mixed slurry, and the conductive additive is Ketjen Black ;

[0046] (3) Knead the mixed slurry in a kneader, the kneading frequency is 20Hz, the time is 8min, and then extrusion molding is carried out, and after cutting, it is dried at a gradient of 85-180°C, that is, it is first dried at 85°C 4h, and then dried at 130°C for 3h, and finally at 180°C for 2h to obtain a rod-shaped carbon electrode.

[0047] Raw material proportioning is that the mass ratio of acetylene black, ...

Embodiment 2

[0052] The difference between this example and Example 1 is that the conductive additive is replaced by carbon nanotubes of equal mass from Ketjen black, and other conditions are completely the same as those of Example 1.

Embodiment 3

[0054] The difference between this example and Example 1 is that the ratio of raw materials is that the mass ratio of acetylene black, Ketjen black, polytetrafluoroethylene emulsion and isoparaffin is 1:0.2:0.1:14, and other conditions are similar to Example 1. Than exactly the same.

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Abstract

The invention relates to a carbon electrode, a method for forming the same, and a use thereof. In the process of forming the carbon electrode, isoparaffin is used as a solvent to be mixed with a binder and acetylene black to obtain a mixed paste. Then, the carbon electrode is obtained by kneading and extrusion molding. The method uses isoparaffin as the solvent to significantly improve the dispersibility of the binder, and strengthens the interaction between the binder and acetylene black so that the components of the carbon electrode obtained by molding are distributed more uniformly, and thepowder removal rate of the obtained carbon electrode is significantly reduced. When the obtained carbon electrode is used as the positive electrode of a lithium / thionyl chloride battery, the deviation of the discharge capacity of the battery under a constant-current condition is significantly reduced.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a carbon electrode and its forming method and application. Background technique [0002] The main components of the positive electrode material of lithium / thionyl chloride battery are acetylene black and binder. At present, water is mostly used as a mixing solvent in the production process of carbon cathodes. Acetylene black itself has strong hydrophobic characteristics, so that in the process of mixing, full infiltration of acetylene black requires high stirring speed and long dispersion time. The polytetrafluoroethylene emulsion of the binder is difficult to uniformly disperse in the acetylene black, so that the prepared carbon positive electrode exhibits a high powder shedding rate and poor electrical conductivity, thereby affecting the discharge performance of the battery cell assembled from it. In addition, some processes use ethanol or isopropanol as a mixing solvent. Althou...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/04H01M4/06H01M4/08
CPCH01M4/62H01M4/583H01M4/625H01M4/0433H01M4/06H01M4/08H01M2004/028Y02E60/10
Inventor邓辉辉曹浪祝媛孙佩玲张俊袁中直刘金成
OwnerEVE ENERGY CO LTD