In a revolutionary approach to lithium battery production, a dust-free mixing technology has been developed for the handling of lithium battery powder active materials. This innovation is accompanied by a comprehensive intellectual property protection strategy. The process involves packaging the active material in a dissolvable bag during mixing. The outer layer remains a traditional aluminum-plastic film, while the inner bag is made of a water-soluble or solvent-soluble material. When the dissolvable bag and the active material are placed into the solvent used in the slurry preparation, the bag dissolves, allowing the material to be cleaned and mixed without any dust generation.
This method is particularly beneficial for materials like lithium iron phosphate cathode materials and carbon nanotube conductive agents, which are known for their severe dust issues. By eliminating dust exposure, the working environment becomes much cleaner and safer for operators.
For example, a PVDF bag measuring 350mm x 460mm with a thickness of 40 microns and a weight of 21.76g can hold approximately 6 kg of lithium iron phosphate. The weight ratio of the bag to the material is only 0.36%, and when compared to the overall binder content (typically 2.5%), the impact is negligible. Even if the binder content is reduced, the effect remains minimal, as both the bag and the binder are made from PVDF.
Similarly, for ternary NCA and NCM materials, a larger PVDF bag of 350mm x 460mm with a thickness of 80 microns and a weight of 43.52g is used, capable of holding about 17 kg of material. The bag’s contribution to the binder content is just 0.26%, ensuring no significant change in the final formulation.
The use of these dissolvable bags is also highly effective for conductive agents such as SP, KS-6, and carbon nanotubes. These materials often generate serious dust during feeding, making the soluble packaging solution essential for improving workplace safety and reducing environmental contamination.
The benefits of this process are numerous: it completely eliminates dust pollution, enables faster charging, supports automation, reduces the need for complex feeding systems, avoids secondary weighing, prevents exposure of sensitive materials to air contaminants, protects worker health, and ensures a clean production environment necessary for high-quality batteries.
With the growing demand for lithium battery materials—reaching over 160,000 tons of cathode materials and 120,000 tons of anode materials in China alone in 2016—the need for such a dust-free solution is increasing rapidly. The potential market for dissolvable packaging bags is substantial, offering not only a practical solution but also a profitable opportunity for technological advancement.
This innovative process is universally applicable across all lithium battery manufacturing facilities, and with proper IP protection, it can be implemented without competition. The goal is to support the large-scale, automated, and human-friendly development of the lithium battery industry in China.
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