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CNT-containing aqueous lithium battery paste and preparation method thereof

A lithium battery and slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as damage balance, substandard secondary particles, and affecting processing performance, so as to solve the dispersion problem, simplify the preparation method, and improve production. efficiency effect

Active Publication Date: 2019-05-03
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CNT, as a nano-scale material, is originally uniformly dispersed in the dispersion system, but after mixing CNT with other dispersion systems, its original balance is destroyed, so that CNT will agglomerate with the main material and other conductive agents, and the secondary particles will not Standard, or will affect the overall processing performance

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  • CNT-containing aqueous lithium battery paste and preparation method thereof
  • CNT-containing aqueous lithium battery paste and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A positive electrode aqueous lithium battery slurry containing CNT, comprising the following components in parts by mass: 15 parts of polyacrylate; LiFePO 4 5 parts; 5 parts of Super-P conductive agent; 5 parts of water-based CNT; 20 parts of deionized water.

[0039] The specific preparation method of the above-mentioned lithium battery slurry is (carried out in a double planetary vacuum mixer):

[0040] ① Stir 70% of polyacrylate and deionized water for 20 minutes in an environment with a vacuum degree of -0.08mpa;

[0041] ② Add Super-P conductive agent and stir at a low speed. After the Super-P conductive agent is fully wetted, stir for 60 minutes at a revolution speed of 70r / min, a dispersion speed of 3000r / min, and a vacuum of -0.08mpa;

[0042] ③Add LiFePO 4 , 20% of deionized water, and stirred for 120min at a revolution speed of 70r / min, a dispersion speed of 3000r / min, and a vacuum of -0.08mpa;

[0043]④ Add the CNT dispersion (the CNT dispersion is the wa...

Embodiment 2

[0047] A positive electrode aqueous lithium battery slurry containing CNT, comprising the following components in parts by mass: 35 parts of polyacrylate; 15 parts of LMO; 15 parts of KS-6 conductive agent; 15 parts of aqueous CNT; 40 parts of deionized water.

[0048] The concrete preparation method of above-mentioned lithium battery slurry is:

[0049] ① Stir 85% of polyacrylate and deionized water for 30 minutes in an environment with a vacuum degree of -0.07mpa;

[0050] ② Add KS-6 conductive agent and stir at a low speed. After the KS-6 conductive agent is fully wetted, stir for 120 minutes under the conditions of revolution speed 90r / min, dispersion speed 4000r / min, and vacuum degree -0.07mpa;

[0051] ③Add 10% of LMO and deionized water, and stir for 180min under the conditions of revolution speed of 80r / min, dispersion speed of 4000r / min, and vacuum degree of -0.07mpa;

[0052] ④ Add the CNT dispersion (the CNT dispersion is the water-based slurry of the model LB200-5...

Embodiment 3

[0056] A positive electrode aqueous lithium battery slurry containing CNT, comprising the following components in parts by mass: 20 parts of polyacrylate; 10 parts of LNCM; 10 parts of Super-P conductive agent; 10 parts of aqueous CNT; 30 parts of deionized water.

[0057] The concrete preparation method of above-mentioned lithium battery slurry is:

[0058] ① Stir 80% of polyacrylate and deionized water for 25 minutes in an environment with a vacuum degree of -0.09mpa;

[0059] ② Add the Super-P conductive agent and stir at a low speed. After the Super-P conductive agent is fully wetted, stir for 90 minutes at a revolution speed of 80r / min, a dispersion speed of 3500r / min, and a vacuum of -0.09mpa;

[0060] ③ Add 20% of LNCM and deionized water, and stir for 150 minutes under the conditions of revolution speed of 75r / min, dispersion speed of 3500r / min, and vacuum degree of -0.09mpa;

[0061] ④ Add the CNT dispersion (the CNT dispersion is the water-based slurry of the model ...

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Abstract

A CNT-containing aqueous lithium battery paste is characterized by comprising the following components, by mass, 15 to 35 parts of aqueous binder; 5 to 15 parts of positive electrode or negative electrode active material; 5 to 15 parts of conductive agent; 5 to 15 parts of aqueous CNT, and 20 to 40 parts of deionized water, wherein the aqueous CNT has a diameter of 10 to 54 nm. The invention alsodiscloses a method for preparing the aqueous lithium battery paste. The method comprises adding a CNT dispersion liquid for stirring after high-viscosity stirring. Thus, the CNT can be uniformly dispersed into a paste system to prevent the secondary agglomeration of the CNT dispersion liquid with other conductive agents or main materials, thereby well solving the dispersion problem of CNT and thepaste stability. In addition, since the paste prepared by the invention is uniformly dispersed, the sieving efficiency of the paste can be improved, the sieving time can be reduced, the production efficiency can be improved, and the production cost can be reduced. The lithium battery paste of the invention is simple in ingredients and simple in preparation method.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a CNT-containing aqueous lithium battery slurry and a preparation method thereof. Background technique [0002] With the development of the new energy industry and the continuous improvement of the performance of lithium batteries, its preparation process is becoming more and more perfect, and the requirements for various main materials and auxiliary materials are also continuously increasing, including conductive agents. There are many types of conductive agents, including conductive Carbon black Super-P, graphite conductive agent KS-6, carbon fiber VGCF, carbon nanotube CNT, graphene, etc. Different conductive agents have different effects on improving battery performance, among which CNT has the best effect. Carbon nanotube CNT, also known as bucky tube, is a kind of tubular carbon molecule, which belongs to nanoscale conductive agent. It is li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 周昶吉刘沛周施博文
Owner ZHEJIANG CASNOVO MATERIALS
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