Method for using carbon nano conductive agent in lithium ion battery aqueous slurry

A lithium-ion battery, water-based slurry technology, applied in battery electrodes, circuits, electrode manufacturing and other directions, can solve the problems of unusable, low electronic conductivity, and failure to find better ones, and achieves improved rate, simple method, low cost effect

Inactive Publication Date: 2014-06-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The improvement of the conductivity of electrode materials is a key factor in improving battery performance. For example, lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary positive electrode active materials for lithium-ion batteries on the market all have a common disadvantage: electron low conductivity
However, most carbon nanomaterials are hydrophobic, and it is difficult to disperse them uniformly in aqueous solution without the use of surfactants, resulting in unqualified processing performance of the pole piece, which makes them unable to be used in the aqueous process of lithium-ion batteries. usage of
Most of the surfactants are polymers, which are insulating materials. Although the addition of surfactants can make the carbon nanomaterials better dispersed in the aqueous solution, it will also greatly affect the conductivity of the carbon nanomaterials. sex
Therefore, for the application of carbon nanomaterials as conductive agents for lithium ion batteries in the aqueous process of lithium ion batteries, the contradiction between their uniform dispersion and maintaining the high electrical conductivity of hydrophobic carbon nanomaterials has not been able to find a better solution. Solution

Method used

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  • Method for using carbon nano conductive agent in lithium ion battery aqueous slurry
  • Method for using carbon nano conductive agent in lithium ion battery aqueous slurry
  • Method for using carbon nano conductive agent in lithium ion battery aqueous slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0031] according to figure 1 The slurry preparation process is used to prepare the pole piece. Weigh 3 grams of sodium carboxymethyl cellulose, add it to a beaker, add 120 grams of water, stir at a speed of 500 rpm until it becomes a transparent colloid, and then add 2 gram of graphene, 2 grams of Super-P, 200 grams of lithium iron phosphate and 10 grams of styrene-butadiene rubber. After stirring for 4 hours, the viscosity of the slurry was adjusted to 7000 mPa·s by adjusting the amount of water added. Then the slurry is ball milled (the ball milling speed is 400 rpm, the ball milling time is 40 minutes, the mass ratio of zirconia balls and slurry is 1:1), and the ball milled slurry is sieved through a 150-mesh screen. According to 10mg / cm 2 The areal density is coated on one side, and then baked in an oven at 80°C for 24 hours. This pole piece is marked as pole piece A. Such as figure 2 As shown in (a), the surface of pole piece A is smooth without defects such as cracks...

Embodiment 2

[0040] Weigh 3 grams of sodium carboxymethyl cellulose, add it to a beaker, add 120 grams of water, stir at a speed of 500 rpm until it becomes a transparent colloid, then add 2 grams of carbon nanotubes, 2 grams of Super-P, 200 grams of lithium iron phosphate and 10 grams of styrene-butadiene rubber (SBR), after stirring for 4 hours, water was added to adjust the viscosity of the slurry to 7000 mPa·s. Then the slurry in the beaker is ball milled (the ball milling speed is 400 rpm, the ball milling time is 40 minutes, the mass ratio of zirconia balls and slurry is 1:1), and then the ball milled slurry is screened with a 150-mesh screen. Sieve, then according to 10mg / cm 2 The areal density is coated on one side, and then baked in an oven at 80°C for 24 hours to obtain a pole piece with excellent processability.

Embodiment 3

[0042] Weigh 3 grams of sodium carboxymethyl cellulose, add it to a beaker, add 120 grams of water, stir at a speed of 500 rpm until it becomes a transparent colloid, then add 1 gram of carbon nanotubes, 1 gram of KS-6 conductive graphite, 2 grams of Super-P, 200 grams of lithium iron phosphate and 10 grams of styrene-butadiene rubber (SBR), after stirring for 4 hours, add water to adjust the viscosity of the slurry to 7000mPa·s. Then the slurry in the beaker is ball milled (the ball milling speed is 500 rpm, the ball milling time is 30 minutes, the mass ratio of zirconia balls and slurry is 1:1), and then the ball milled slurry is screened with a 150-mesh screen. Sieve, then according to 10mg / cm 2 The areal density is coated on one side, and then baked in an oven at 80°C for 24 hours to obtain a pole piece with excellent processability.

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Abstract

The invention discloses a method for using a carbon nano conductive agent in lithium ion battery aqueous slurry, and belongs to the technical fields of conductive agents and lithium ion batteries. According to the method disclosed by the invention, the carbon nano conductive agent is directly added into the lithium ion battery anode/cathode aqueous slurry (free from a surface active agent) and then is subjected to ball milling at a high speed after being stirred; the hydrophobic carbon nano conductive agent is effectively dispersed by utilizing shearing force generated during ball-milling at the high speed, so that various constituent materials in the lithium ion battery anode/cathode aqueous slurry can be uniformly dispersed, and therefore, the hydrophobic carbon nano conductive agent can also be applied in the lithium ion battery aqueous slurry in the absence of the surface active agent. The method disclosed by the invention is simple in process and low in cost; the current process is not changed; after being coated, the slurry prepared by utilizing the method disclosed by the invention is assembled to form a lithium ion battery, and therefore, the rate capability can be effectively increased.

Description

technical field [0001] The invention belongs to the technical field of conductive agents and lithium ion batteries, and in particular relates to a method for using carbon nanometer conductive agents in aqueous slurry of lithium ion batteries. Background technique [0002] Since Sony first commercialized lithium-ion secondary batteries in the 1990s, lithium-ion batteries have become popular due to their high specific energy, high operating voltage, low self-discharge, good cycle life, environmental friendliness, and good safety performance. Taking the lead in becoming a leader in the field of new energy, it has been widely used in mobile communication equipment, electric tools, electric bicycles, etc., and is currently developing and expanding the application of lithium-ion batteries in electric vehicles, energy storage power stations, and military industries. [0003] The improvement of the conductivity of electrode materials is a key factor in improving battery performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139
CPCY02E60/122H01M4/0416H01M4/139H01M4/625Y02E60/10
Inventor 李峰宋仁升闻雷成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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