Water-based carbon nanotube conductive paste

Conductive agent is a polymer compound that adheres active materials to current collectors during electrode production. Its main functions include bonding and retaining active materials, enhancing the contact between active materials and conductive agents, and between active materials and current collectors, and stabilizing the structure of the pole piece. Because the volume of the positive and negative electrodes of lithium-ion batteries will expand and shrink during the cycle, it is also hoped that the binder can play a certain buffering role....

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Conductive agent is a polymer compound that adheres active materials to current collectors during electrode production. Its main functions include bonding and retaining active materials, enhancing the contact between active materials and conductive agents, and between active materials and current collectors, and stabilizing the structure of the pole piece. Because the volume of the positive and negative electrodes of lithium-ion batteries will expand and shrink during the cycle, it is also hoped that the binder can play a certain buffering role.

Therefore, the selection of a suitable lithium battery binder generally requires that its ohmic resistance should be small, its performance should be stable in the electrolyte, and it should not expand, loosen, or shed powder. Generally speaking, the properties of the binder, such as bonding force, flexibility, alkali resistance, hydrophilicity, etc., directly affect the performance of the battery. Adding the optimal amount of binder can obtain a larger capacity, a longer cycle life, and a lower internal resistance, which has a promoting effect on improving the battery's cycle performance, rapid charging and discharging capabilities, and reducing the battery's internal pressure. Therefore, it is very important to choose a suitable binder.

Lithium battery conductive agents are divided into two categories: Oil-based carbon nanotube conductive paste and Water-based carbon nanotube conductive paste. Oil-based carbon nanotube conductive paste is most widely used in polyvinylidene fluoride (PVDF) homopolymer and copolymer, using organic solvents as dispersants. Water-based carbon nanotube conductive paste is widely used in styrene-butadiene (SBR) latex binder, using water as dispersant.

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