Preparation methods of oily conductive agent slurry and electrode plate, and assembly method of battery

Abstract

The invention provides a preparation method of oily conductive agent slurry and an electrode plate, and an assembly method of a battery. The preparation method of the oily conductive agent slurry comprises the following steps of mixing NMP and dispersing agent, and uniformly stirring to obtain a first mixture, shearing, grinding and stripping the heat-treated graphene, and mixing the graphene witha parts of the first mixture to obtain second mixture, mixing the carbon nanotubes subjected to heat treatment with a parts of the first mixture, and performing turbine dispersion treatment to obtaina third mixture, carrying out mixing treatment and vortex dispersion treatment on the second mixture and the third mixture to obtain a fourth mixture, and carrying out demagnetization and defoaming treatment on the fourth mixture to obtain the oily conductive agent slurry. The method is advantaged in that the dosage proportion of the oily conductive agent in the battery can be reduced, and conductivity of the electrode material can be significantly enhanced.

Description

technical field [0001] The invention relates to the technical field of conductive material preparation, in particular to a method for preparing an oily conductive agent slurry and an electrode sheet, and a method for assembling a battery. Background technique [0002] At present, battery manufacturers mainly add carbon black or carbon nanotube materials to prepare conductive agents in the lithium iron phosphate oily system of the battery positive electrode. between the conductive properties. [0003] When carbon black is added as a conductive agent in the positive lithium iron phosphate oily system of the battery, it will lead to unstable circulation and poor rate performance of the positive lithium iron phosphate oily system of the battery, and the amount of the conductive agent is also large, thereby improving the performance of the positive electrode of the battery. Lithium iron phosphate oily system price. Specifically, combine figure 1 and figure 2 , where, from f...

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Problems solved by technology

[0003] When carbon black is added as a conductive agent in the positive lithium iron phosphate oily system of the battery, it will lead to unstable circulation and poor rate performance of the positive lithium iron phosphate oily system of the battery, and the amount of the conductive agent is also large, thereby improving the performance of the positive electrode of the battery. Lithium Iron Phosphate Oily System Price

Specifically, combine figure 1 and figure 2 , where, from figure 1 It can be known from the above: when charging at 0.5C / 3, testing the discharge cycle performance of the positive electrode lithium iron phosphate oily system of the battery with only carbon black added, the test results show that the cycle is unstable and the efficiency is low; from figure 2 It can be known from the above that, with 0.5C charge / 1C→10C, test the high-rate discharge performance of the battery positive lithium iron phosphate oily system with only carbon black added. When the rate is 1C, the discharge specific capacity can only reach 80mAh / g, and the efficiency extremely unstable

However, when carbon nanotubes are added as a conductive agent in the lithium iron phosphate oily system of the positive electrode of the battery, the combined image 3 and Figure 4 , due to the agglomeration phenomenon often accompanied by the homogenization process, the carbon nanotube conductive material cannot be used effectively, thus affecting the electrical conductivity of the lithium iron phosphate oily system at the positive electrode of the battery

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