Plasma Jet Nanoparticle Synthesis for Battery Anodes

The bulk silicon is divided into nanosized particles (20-150 nm diameter) to segment the material structure. This segmentation allows each particle to independently accommodate volume changes during lithium storage and release, preventing the catastrophic degradation that occurs in bulk silicon while maintaining high lithium storage capacity.

The patent applies different properties to different scales: nanosized particles provide local flexibility to accommodate volume changes, while the overall electrode structure maintains electronic conductivity. The dopant elements (phosphorus, boron, arsenic, or antimony) are distributed throughout the silicon lattice to locally enhance electrical conductivity without compromising the nanoscale structure.

The patent replaces complex mechanical milling or top-down approaches with a chemical vapor deposition process using silane gas decomposition. This substitution enables continuous production of uniform nanosized particles at scale, overcoming the limitations of batch-processing mechanical methods while maintaining narrow particle size distribution (20-150 nm).

The manufacturing process controls critical parameters including silane flow rate, reaction temperature, and dopant concentration to achieve consistent nanosized particle production. By optimizing these parameters, the process achieves both high cycle performance (through uniform 20-150 nm particles) and manufacturing scalability (through continuous CVD production).

The patent utilizes the phase transition of silane gas to solid silicon nanoparticles through controlled chemical decomposition. By controlling the reaction conditions (temperature, pressure, gas flow), the phase transition produces uniform nanosized particles with diameters consistently in the 20-150 nm range, achieving both volume change control and particle size uniformity.

The continuous CVD process incorporates feedback control through monitoring silane decomposition rates and adjusting reaction parameters in real-time. This feedback mechanism ensures that particle nucleation and growth occur at controlled rates, maintaining narrow size distribution (20-150 nm) while enabling continuous production for scalability.

The patent replaces inefficient mechanical processing and multiple purification steps with a single continuous chemical vapor deposition process. The CVD method directly produces high-purity nanosized silicon particles with controlled dopant incorporation, achieving both high battery performance and manufacturing efficiency through a unified process rather than sequential operations.

The continuous CVD process enables uninterrupted production of high-purity nanosized silicon powder. By maintaining continuous silane decomposition and particle formation, the process achieves high productivity while ensuring consistent purity and uniform particle size, thereby enhancing battery performance without sacrificing manufacturing efficiency.