Preparation Method of Conductive Paste for Lithium-ion Battery

Advancing technology is continuous and is apparent with battery technologies. People are aware of recent technology advancements but have no clue about the conductive paste and its importance for lithium-ion batteries.

The conductive paste comprises graphene, and this graphene surface receives a first adhesive grafting. Conductive adhesive improves the  lithium-ion battery performance, as it makes use of the active materials.  A lithium-ion battery conductive adhesive has adhesion properties and good electrical conductivity. It promotes the electrode plate’s mechanical strength as the conductive adhesive has adhesive and the conductive agent combination. 

The innovation for lithium-ion battery is that it comprises the conductive adhesive on an electrode plate and follows a preparation method of conductive paste. 

Mix Active Materials with Carbon Black and other Conductive Agents

The lithium-ion battery production is one of the vital steps in the conductive paste. It involves active materials that mix with carbon black and remaining conductive agents. Nevertheless, it mainly includes   appropriate materials selection and efficient mixing to set a perfect base, assuring the reliable performance of a lithium-ion battery.

Select appropriate active materials – It is a process initiating with appropriate selection of active materials. It is essential because they store charges and release the electrical energy form during a cycle discharge.  It is responsible for the main function, so selecting any wrong material may result in a performance drop in the battery. There is a need to choose materials, featuring the ability of reversing chemical reactions. It helps to be on the safer side. Thus, using common materials, such as Lithium iron phosphate, Lithium manganese oxide, and lithium cobalt oxide becomes essential.

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Using different dispersion techniques to acquire a homogenous state- Acquiring a homogenous state of the mixture is mandatory for the conductive paste. Only then, it ensures steady battery performance. In case, there is a variation in the homogenous mixture, the active materials will reveal an uneven distribution between electrodes. It means the capacity, reliability, and cycle life of the lithium-ion battery will decrease. It is the reason multiple dispersion techniques utilization is essential to confirm the homogenous mixture is appropriate and final.

Mixing Metal Salts and Organic Chemicals

The preparation of mixing a solvent with organic compounds and metal salts is the next step. It involves selecting the solvent carefully and applying in balanced concentrations. It is to ascertain a balanced paste is receivable by the process end.

Importance of chemistry- It is crucial to consider chemistry and its role in the entire process in this step. It is the reason the organic components and metal salts are chosen with utmost care, and the solvent mixing takes place cautiously, ensuring proper chemical balance. Thus, it helps acquiring the sophisticated electrochemical reactions in the battery, and it gives the result as expected in the battery performance. If there are any changes in the reactions, the performance of the battery will suffer, such as, an overpowered reaction, will make the battery unstable and unsafe to use.

Appropriate solvent- Choosing the appropriate solvent is equally important so that the balance maintenance is not affected. In this process, a vital decision is the solvent dissolving organic compounds and metal salts must be efficient. Thus, it creates within the battery an appropriate environment for electrochemical reactions. The solvent requires a perfect balance in the conductive slurry with these characteristics, such as:

Dielectric constant

Low viscosity

Non-flammability

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Low temperature high energy density

-40℃ 0.2C discharge capacity ≥80%

Wide electrochemical stability

Rugged Laptop Polymer Battery

Anti-corrosion, dustproof, dropping resistance, anti-electromagnetic interference

Battery specification: 11.1V 7800mAh

Low Temperature- High Energy Density- Rugged Laptop Polymer Battery 11.1V 7800mAh.

With these characteristics, the battery will reveal overall stability and ensure good performance. Therefore, materials such as, ethyl methyl carbonate, ethylene carbonate, and dimethyl carbonate are the appropriate solvents as they possess the essential properties.

Inorganic Chemicals React With Organic Chemicals

In this step, the crucial part is in keeping the metal salts and organic compounds ratios in balance while mixing. Any discrepancy in maintaining a balance results in electrolyte degradation, resulting in an unsafe and unstable battery. Besides, the battery will also face other issues.

There is a need to make a conductive paste by compressing the powders as mentioned above and to mix the organic and inorganic chemicals. This compression process takes place under low temperatures. However, the conductive paste final stage process employs high shear force to attain the exact conductive slurry. The need to concentrate is on:

Solvents in low temperature and their benefits- Preparing conductive paste is a process involved in the lithium-ion battery, and it uses solvents in low temperature.  Maintaining the low temperature is beneficial as it is in a liquid form on many levels, ensuring stability and safety of the process. Furthermore, the process enhances with low-temperature operation, thereby controlling the conductive paste properties, such as drying time, viscosity, etc.

Combine shear forces to create the paste- Shear forces are useful in compressing the slurry, and they attach through ultrasonic or mechanical means. Thus, it ensures the efficient distribution of materials within the solvent, and acquiring a homogenous conductive paste becomes easy.

Importance of polymer binders- In the conductive paste preparation process, polymer binders are helpful as they gain structural integrity. These polymers form a strong network and work as adhesive agents in the conductive slurry. It holds together all the conductive agents. Therefore, it is crucial to choose appropriate polymer binders to bind together the materials without affecting the battery performance. It is the reason, why polymer binders such as polyvinylidene fluoride and carboxymethyl cellulose make an appropriate choice.

Conclusion

The battery industry of lithium-ion is showing advancements and is the main reason that the portable power applications delivery is showing a lot of improvement. Multiple factors ensure good performance of batteries, and one of the significant ones is the conductive paste. It enhances the battery's energy density and charges rapidly, promoting the cycle life of the battery. Therefore, with production improvements in the conductive paste, there is more scope to witness an increase in lithium-ion battery efficiency.