Dry Electrode Laboratory/Pilot/Production Line /Technology Solution

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TMAX-DRY-CY05
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Dry Electrode Laboratory/Pilot/Production Line /Technology Solution

Ⅰ、The main differences between dry electrode batteries and traditional batteries in electrode technology:

The difference between dry electrode batteries and traditional batteries is mainly reflected in the manufacturing process of the electrode plates. Traditional lithium battery manufacturing involves mixing solvent NMP with negative or positive electrode powder with adhesive materials, then coating the slurry on the electrode collector and drying it. Dry electrode technology does not use solvents, but mixes a small amount (about 5-8%) of fine powder PTFE adhesive with positive electrode powder, and then forms a thin electrode material strip through an extruder. Finally, the extruded electrode material strip is laminated onto a metal foil collector to form a finished electrode.

Compared with traditional wet processes, dry electrode technology has the following advantages:

1) High compaction density makes it more compatible with high nickel battery material systems.

The current battery material system of high nickel positive electrode+silicon carbon negative electrode is one of the mainstream directions for the development of lithium batteries.

In terms of positive electrodes, under the traditional production conditions of lithium batteries, high nickel positive electrodes have poor thermal stability, unstable surface structure, and nickel elements are alkaline and easily absorb moisture. The use of dry electrodes can effectively alleviate the above problems.

In terms of the negative electrode, the first charge and discharge efficiency of silicon carbon materials is low (the first cycle generates SEI film on the negative electrode causing capacity loss), the expansion is large, and long cycles can cause material pulverization.

Overall, compared to traditional manufacturing processes, dry electrodes themselves have higher compaction density. At the same time, this technology can apply active materials with higher energy density and stronger liquid sensitivity, such as high nickel and silicon, to electrode production, making it easier to improve battery energy density and reducing the associated risks. At present, dry electrode technology can achieve cell energy density greater than 300Wh/kg, which is more than 10% higher than the current wet electrode battery; In the future, it may reach 500Wh/kg.

2) The cost is reduced by more than 10% -20% compared to wet processes.

Dry electrodes do not use toxic NMP solvents, making them more environmentally friendly. At the same time, production processes such as coating and electrode drying are eliminated, reducing material and equipment costs and simplifying production processes.

3) Improvement of other important performance.

This includes longer cycle life (twice that of wet processes), better high-temperature stability, higher charging and discharging rates (lower internal resistance of dry electrode plates), and lower energy consumption.

Ⅱ、Principle of dry electrode production