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Lithium battery positive electrode slurry and preparation method thereof

A positive electrode slurry, lithium battery technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of conductive agents and other solid substances that cannot be uniformly and stably dispersed, poor battery capacity performance, and fast capacity decay speed , to achieve the effect of long service life, convenient operation and high capacity retention rate

Active Publication Date: 2013-07-17
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that solid substances such as conductive agents cannot be uniformly and stably dispersed in the electrode slurry during the stirring and mixing process of preparing the positive electrode slurry in the prior art, so that the capacity of the battery prepared with the positive electrode slurry has poor performance and capacity decay. Due to the shortcomings of fast speed and poor cycle performance, a positive electrode slurry containing a conductive enhancer and a dispersant and its preparation method are provided, so that solid substances such as conductive agents can be uniformly and stably dispersed in conventional stirring equipment, and through The lithium battery prepared by the invention has high capacity retention rate, good cycle performance and long service life

Method used

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  • Lithium battery positive electrode slurry and preparation method thereof
  • Lithium battery positive electrode slurry and preparation method thereof
  • Lithium battery positive electrode slurry and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Firstly, various substances required for preparing positive electrode materials were weighed in proportion, and the specific proportions are shown in Table 1, and ordinary planetary slurry mixer was used for stirring.

[0034] First add 5% N-methylpyrrolidone of the mass of the positive electrode material into the stirring tank of the planetary slurry mixer, then add the conductivity enhancer and dispersant to obtain the first slurry, and measure the fineness every 10 minutes after stirring until the first The fineness of the slurry is 150nm; then add the binder and stir until the binder dissolves; then add the conductive agent and N-methylpyrrolidone which is 40% of the mass of the positive electrode material to obtain the second slurry, and measure the fineness every 10 minutes after stirring. until the fineness of the second slurry is 150nm; finally add the positive active material to obtain the coarse slurry, and measure the fineness every 10min after stirring until ...

Embodiment 2

[0040] Firstly, various substances required for preparing positive electrode materials were weighed in proportion, and the specific proportions are shown in Table 1, and ordinary planetary slurry mixer was used for stirring.

[0041] First add 25% N-methylpyrrolidone of the mass of the positive electrode material into the stirring tank of the planetary slurry mixer, then add the conductivity enhancer and dispersant to obtain the first slurry, and measure the fineness every 20 minutes until the first The fineness of the slurry is 20 μm; then add the binder and stir until the binder dissolves; then add the conductive agent and N-methylpyrrolidone which is 60% of the mass of the positive electrode material to obtain the second slurry, and measure the fineness every 20 minutes after stirring. until the fineness of the second slurry is 20 μm; finally add the positive active material to get the coarse slurry, and measure the fineness every 20 minutes until the fineness of the coarse ...

Embodiment 3

[0047] Firstly, various substances required for preparing positive electrode materials were weighed in proportion, and the specific proportions are shown in Table 1, and ordinary planetary slurry mixer was used for stirring.

[0048] First add N-methylpyrrolidone which is 20% of the mass of the positive electrode material into the stirring tank of the planetary slurry mixer, then add the conductivity enhancer and dispersant to obtain the first slurry, and measure the fineness every 15 minutes after stirring until the first The fineness of the slurry is 250nm; then add the binder and stir until the binder dissolves; then add the conductive agent and N-methylpyrrolidone which is 45% of the mass of the positive electrode material to obtain the second slurry, and measure the fineness every 15 minutes after stirring. until the fineness of the second slurry is 10 μm; finally add the positive active material to obtain the coarse slurry, and measure the fineness every 12 minutes until ...

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Abstract

The invention discloses lithium battery positive electrode slurry. The lithium battery positive electrode slurry is a mixture of a positive electrode material and an organic solvent. The positive electrode material is composed of, by mass, 60-97% of a positive electrode active material, 1-30% of a binding agent, 0-10% of a conductive agent, 1-5% of a conductive reinforcing agent and 0.1-3% of a dispersing agent. A lithium battery prepared by the lithium battery positive electrode slurry provided by the invention has the advantages of excellent high temperature performance, high capacity conservation rate, good cycle performance, long service life and the like. The invention also provides a preparation method of the lithium battery positive electrode slurry, enabling solid materials such as the conductive reinforcing agent to be distributed in the organic solvent uniformly and stably and to be directly stirred and mixed in a common stirring apparatus, so that the operation is convenient and the method can realize large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a lithium battery cathode slurry and a preparation method thereof. Background technique [0002] With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have a higher capacity, but also require better capacity retention during repeated charging and discharging. rate, exhibits good cycle performance, and has a long service life. [0003] In order to increase the battery capacity, there are usually two methods, one is to increase the specific capacity of the electrode active material, and the other is to increase the proportion of the electrode active material in the positive electrode material, while reducing the content of other substances such as binders and conductive agents. Since the specific capacity of the positive e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139
CPCY02E60/10
Inventor 李凡群朱修锋陈军
Owner WANXIANG 123 CO LTD
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