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Preparation method of positive electrode paste for lithium fluorocarbon battery with carbon nanotube as conductive agent

A lithium fluorocarbon battery, carbon nanotube technology, applied in electrode manufacturing, battery electrodes, electrodes of primary batteries, etc., can solve the problems of no electrochemical activity, reduced battery specific energy, poor electrical conductivity, etc., to achieve operation Simple and easy to understand, the effect of improving high and low temperature performance, and improving safety performance

Inactive Publication Date: 2019-07-02
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon black-based conductive agents (such as acetylene black, SUPER P, carbon fiber, etc.) and graphite-based conductive agents (such as KS-6, KS-15) are low in cost, but their conductivity is poor, and it is often necessary to add a large amount to achieve better performance. The conductive effect, because the conductive agent itself is not electrochemically active, but ultimately reduces the specific energy of the battery

Method used

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  • Preparation method of positive electrode paste for lithium fluorocarbon battery with carbon nanotube as conductive agent
  • Preparation method of positive electrode paste for lithium fluorocarbon battery with carbon nanotube as conductive agent
  • Preparation method of positive electrode paste for lithium fluorocarbon battery with carbon nanotube as conductive agent

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Embodiment 1

[0034] The preparation method of positive electrode slurry for lithium carbon fluoride battery with carbon nanotubes as conductive agent takes the positive electrode slurry and preparation method using Super P and carbon nanotubes as conductive agent respectively as examples. The slurry formula is shown in the table below.

[0035]

[0036] Homogenization process flow is as follows:

[0037] 1.1# sample takes by weighing 1.2kg fluorocarbon, 80g Super P and 27g sodium carboxymethyl cellulose, 3# sample takes by weighing 1.2kg fluorocarbon and 25g sodium carboxymethyl cellulose and puts it into a double planetary power mixer, with Stir at a low speed of 60 rpm and a high speed of 2000 rpm for 30 minutes;

[0038] 2. Add solvent, then stir until there is no obvious dry powder in the slurry;

[0039] 3. Use low-speed stirring of 60 rpm and high-speed dispersion of 3000 rpm. The stirring time is 5 hours, and the temperature is controlled at 20-55°C. When stirring for 3 hours, ...

Embodiment 2

[0043] The preparation method of positive electrode slurry for lithium carbon fluoride battery with carbon nanotubes as conductive agent takes the positive electrode slurry and the preparation method of adding different amounts of carbon nanotube conductive glue as an example. The slurry formula is shown in the table below.

[0044]

[0045] 3# sample homogenization procedure sees embodiment 1, 2# sample homogenization procedure flow process is as follows:

[0046] 1. Weigh 1.2kg of carbon fluoride and 25g of sodium carboxymethyl cellulose, put them into a double planetary power mixer, stir at a low speed of 65 rpm and a high speed of 3000 rpm for 30 minutes;

[0047] 2. Add solvent, then stir until there is no obvious dry powder in the slurry;

[0048] 3. Use low-speed stirring of 65 rpm and high-speed dispersion of 3500 rpm. The stirring time is 6 hours, and the temperature is controlled at 20-55°C. When stirring for 3 hours, 2# sample is added with conductive adhesive c...

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Abstract

The invention relates to a preparation method of positive electrode paste for a lithium fluorocarbon battery with a carbon nanotube as a conductive agent, and belongs to the technical field of lithiumprimary batteries. According to the preparation method of the positive electrode paste for the lithium fluorocarbon battery with the carbon nanotube as the conductive agent, the conductive adhesive containing the carbon nanotube is used as the conductive agent, the mass ratio of the positive electrode material, the conductive agent and the adhesive of the positive electrode paste is 90-97.5: 6-0.5: 4-2, the paste solvent is deionized water or N-methyl pyrrolidone and the paste solid content is 30-50wt%. The preparation process is that firstly the paste solid powder is stirred and mixed in a mixer, the solvent is added, the paste solid powder is stirred at a low speed of 30-70 revolutions per minute and dispersed at a high speed of 2000-5500 revolutions per minute, and the stirring time is5-8 hours; after 3 to 5 hours of stirring, carbon nanotube conductive adhesive is added; and a binder is added and stirred for 30 to 60 minutes so as to obtain the positive electrode paste for the lithium fluorocarbon battery. The method has the advantages of simple operation and convenience and rapidity and is suitable for large-scale production and greatly improves the electrochemical performance of the lithium fluorocarbon battery such as high current discharge capacity and energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium primary batteries, in particular to a method for preparing positive electrode slurry for lithium carbon fluoride batteries using carbon nanotubes as conductive agents. Background technique [0002] Lithium fluoride battery is currently the primary battery system with the highest specific energy. It has the advantages of good safety, long-term charged storage, no need for maintenance and activation, and is widely used in various fields of land, sea, air, space and electricity. [0003] During the discharge process of the lithium fluoride battery, the resistance of the pole piece accounts for as high as 80-90% of the internal resistance, so that the conductivity of the electrode will affect its energy output, especially during the high current discharge process. Larger electrode internal resistance will intensify the polarization, reduce the voltage platform, and ultimately lead to a decrease in bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/08H01M6/14
CPCH01M4/625H01M4/04H01M4/08H01M6/14
Inventor 杨芳凝苏晓倩王九洲
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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