The Influence of Coating Process for Lithium Battery Performance

Battery coating process is generally refers to the slurry evenly stirred evenly coated on the fluid collection, and drying the organic in the slurry.The effect coating have a big influence for battery capacity, internal resistance, cycle life and safety, to ensure the uniform coating.The choice of coating method and control parameters have an important impact on the performance of lithium ion batteries, mainly in the following aspects:

1) coating drying temperature control: if the coating drying temperature is too low, it can not ensure that the electrode is completely dry, if the temperature is too high, it may be because of the organic solvent inside the electrode evaporation too fast, the surface coating on the electrode cracks, falls off and other phenomena;

2) coating surface density: if the coating surface density is too small, the battery capacity may not reach the nominal capacity; if the coating surface density is too large, it is likely to cause waste of ingredients. In case of serious excess anode capacity, lithium dendrite punctures the battery membrane, resulting in a short circuit, causing potential safety hazards;

3) coating size: coating size is too small or too large may lead to the anode cannot be completely cathode around inside the battery, in the process of charging, lithium ion from the positive embedded, moved to the electrolyte is not cathode completely encase, cannot efficiently exert the anode real capacity, serious, lithium inside the battery will form the dendrite, easily pierced diaphragm lead to circuit inside the battery;

4) coating thickness: if the coating thickness is too thin or too thick, it will affect the subsequent pole rolling process, and the performance consistency of the battery electrode cannot be guaranteed.

In addition, the electrode coating is of great significance to the safety of batteries.Before coating, 5S work should be done to ensure that no particles, debris, dust, etc. are mixed into the coating process. If mixed with debris, it will cause a small short circuit inside the battery, which will cause the battery to catch fire and explode seriously.

Our battery coating machine can accuracy to achieve the parameter that you need to ensure of the requirement of your battery.

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