Anode Electrode Particle Orientation for Stable Si-Graphite Cycling

The patent applies local quality by creating distinct regions within the anode active material layer: first graphite particles with high aspect ratios form oriented structures that maintain conductive paths, while second graphite particles with low aspect ratios fill voids to prevent particle isolation. This spatial differentiation of particle functions resolves the contradiction between achieving high capacity through Si particle mixing and maintaining cycling reliability through conductive path integrity.

The patent employs composite materials by combining three types of particles (first graphite, second graphite, and Si particles) with specific aspect ratio characteristics. The composite structure leverages the high capacity of Si particles while using the two graphite particle types with different aspect ratios to maintain structural integrity and conductive networks, thus resolving the capacity-reliability contradiction.

The patent applies preliminary action by pre-orienting first graphite particles with high aspect ratios in specific directions before electrochemical cycling begins. This pre-established oriented structure creates a robust framework that anticipates and accommodates subsequent expansion-contraction movements of particles, preventing layout alteration and conductive path interruption while maintaining electrochemical activity.

The patent implements beforehand cushioning by using second graphite particles with low aspect ratios to fill voids between first graphite particles and Si particles. This pre-positioned cushioning structure accommodates the volume changes during charging and discharging, absorbing expansion forces and preventing particle isolation and conductive path disruption.

The patent uses second graphite particles with low aspect ratios as intermediary elements that fill voids between first graphite particles and Si particles. These intermediary particles act as anchors and spacers that prevent first graphite particles from shifting toward void sides during volume changes, while maintaining the oriented structure necessary for ion conduction.

The patent applies local quality by assigning different functional roles to particles in different spatial locations: first graphite particles with high aspect ratios are oriented to promote ion conduction in specific regions, while second graphite particles fill voids in other regions to prevent particle shifting. This spatial functional differentiation resolves the contradiction between ion conduction and position stability.