2results about How to "Facilitates ion diffusion" patented technology

This invention discloses a high-rate carbon-coated lithium iron phosphate cathode material and its preparation method, relating to the field of lithium-ion battery cathode material technology. The material constructs a unique bilayer composite carbon-coated structure on the surface of lithium iron phosphate particles, including an inner continuous dense conductive carbon layer and an outer three-dimensional porous carbon network layer. The inner carbon layer ensures rapid electron conduction, while the outer porous carbon layer maintains electron pathways, provides abundant ion diffusion channels, and buffers volume changes. The preparation method utilizes a stepwise liquid-phase coating and segmented heat treatment process. This invention effectively solves the problems of poor electronic conductivity and slow ion diffusion in lithium iron phosphate materials, significantly improving its high-rate charge-discharge performance and cycle stability. Furthermore, the process is controllable and suitable for large-scale production, showing broad application prospects in power batteries and high-power energy storage.

This invention provides a thick electrode, its preparation method, and its applications. The thick electrode includes a current collector and at least two electrode layers located on the surface of the current collector. An electrospun layer is disposed between the electrode layers. The active material in the electrode layer closer to the current collector surface is a large-particle-size active material, while the active material in the electrode layer farther from the current collector surface is a small-particle-size active material. This invention improves the electrode loading and thickness by designing at least two electrode layers and optimizing the particle size distribution of the main active material in each layer, thereby increasing the specific capacity and energy density of the battery. Simultaneously, the electrospun layer connects the electrode layers, creating a porosity gradient distribution along the direction perpendicular to the electrode, constructing efficient ion diffusion and conduction channels and electron transport channels. This results in good ion diffusion and conduction, reduces polarization during charging and discharging, and ensures high energy density and power performance of the battery.