Secondary Battery SLMP Layer Bonding for Efficiency

The patent applies composite materials by combining high-capacity materials (Si, Sn, SiO) with graphite in the negative electrode structure. This composite approach allows the battery to achieve higher capacity per weight while maintaining acceptable charging/discharging efficiency, as graphite provides structural stability and efficient lithium ion transport pathways while the high-capacity materials contribute additional capacity.

The patent implements local quality by creating a core-shell structure where the central part contains high-capacity materials (Si, Sn, SiO) for maximum capacity, while the outer layer uses graphite for structural stability and efficient ion transport. This localized differentiation allows different regions of the electrode to perform specialized functions, resolving the contradiction between high capacity and good charging/discharging efficiency.

The patent applies segmentation by dividing the electrode into multiple thin layers stacked in sequence, rather than using a single thick electrode. This segmentation creates shorter ion transport paths within each layer while maintaining high energy density through increased layer count, effectively resolving the contradiction between energy density and charging/discharging efficiency.

The patent transitions from a two-dimensional planar electrode structure to a three-dimensional stacked configuration with multiple layers. This dimensional change allows the electrode to achieve high energy density through increased vertical stacking while maintaining short ion transport paths within each individual layer, thus improving both energy density and charging/discharging efficiency simultaneously.

The patent uses thin film technology by applying lithium metal powder as a thin coating layer on the electrode surface rather than bulk material. This thin film approach provides the benefits of improved charging/discharging efficiency while minimizing the increase in electrode thickness, effectively resolving the contradiction between efficiency improvement and thickness control.

The patent applies parameter changes by precisely controlling the thickness and concentration of the lithium metal powder layer. By optimizing these parameters, the patent achieves improved charging/discharging efficiency while keeping the electrode thickness increase within acceptable limits, resolving the contradiction between efficiency and thickness.