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Asphalt-Coated Graphite - Modified Process for Lithium Battery Cathodes, a Winning Strategy in the Competition Among Major Battery Manufacturers


Graphite coated with asphalt significantly enhances battery performancenhances the cathode material's electrical conductivitye:


1. Extended Battery Lifespan: Asphalt coating improves the stability of the cathode material, reducing side reactions with the electrolyte and thereby extending the battery's cycling lifespan.

2. Increased Battery Capacity: Asphalt coating , reducing internal electrode resistance and consequently increasing battery capacity and energy density.

3. Improved Fast Charging Performance: Asphalt coating boosts the ion transfer rate, allowing the battery to charge and discharge more rapidly, enhancing fast-charging capabilities.

4. Enhanced Overcharge and Overdischarge Resistance: Asphalt coating contributes to the stability of the cathode material, reducing the risks of overcharging and overdischarging, thereby improving battery safety performance.

5. Prevention of Electrolyte Co-Embedding Phenomenon: Asphalt coating prevents the electrolyte from embedding into the cathode, reducing irreversible capacity loss in graphite.

Currently, the main method for asphalt-coated graphite is the solid-solid coating method, where graphite powder and asphalt powder are mixed together and rapidly stirred in a high-temperature environment to achieve coating modification. This method is simple and easy to use, achieving coating rates of 50%-70%. However, with the demand for higher mileage and faster charging speeds in electric vehicles, there is an urgent need for cathode materials with stronger performance. This leads us to question: Is there a way to increase the coating rate of asphalt-coated graphite to over 85%?

The answer is YES. TungKuLa powder particle surface coating system T-MIX, utilizing atomization coating technology, involves atomizing solid asphalt for mixing coating. The modification matrix contains multiple turbulent hot air systems, allowing better dispersion of graphite powder, ensuring a more uniform combination with atomized asphalt. Several cathode material manufacturers have collaborated with TungKuLa, achieving particle coating efficiency of over 90%. In the current competition for improving cathode material performance, a more advanced modification coating process may very well become the key determinant of success or failure.


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