This technology features a multi-layer electrode structure where an electrochemically stable LFP (lithium iron phosphate) active material layer is stacked as a protective layer over a high-energy-density NCM (nickel, cobalt, manganese) active material layer. This suppresses degradation at the interface with the electrolyte.
As electrodes become thicker, active material degradation accelerates at the top surface—the interface in contact with the electrolyte—leading to reduced power and lifespan. Conventional inert material coating methods have limitations, such as insufficient protection due to overly thin layers or complex manufacturing processes.
This technology involves forming a first active material layer containing NCM on a current collector, and then casting a second LFP active material layer on top to serve as an interfacial protective layer. By optimizing the thickness ratio of the two layers to 5:3, drying at 100–140℃, and using a 90:5:5 weight ratio, we ensure interfacial stability and durability. Applicable to lithium-ion battery electrodes for portable electronics, mobile units, power devices, and energy storage systems, this method minimizes energy density loss because the protective layer itself acts as an active material that contributes to capacity.
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