Battery Cell Electrode Inclines for Safer High-Energy Capacity Balance

The patent applies local quality by creating an inclined portion only at the end of the positive electrode where lithium ion precipitation occurs, rather than uniformly increasing negative electrode capacity throughout. This localized structural modification prevents precipitation at critical areas while preserving energy density in other regions.

Instead of increasing the negative electrode capacity to prevent precipitation, the patent inverts the approach by modifying the positive electrode structure (creating an inclined portion) to control lithium ion distribution. This reverse strategy achieves safety improvement without the penalty of reduced energy density associated with increasing negative electrode capacity.

The inclined portion is created locally at the end of the positive electrode where precipitation occurs, allowing the positive electrode active material layer to be extended in other regions for higher energy density while preventing precipitation only where necessary through the localized inclined structure.

The patent changes the geometric parameter of the positive electrode active material layer by creating an inclined portion with a specific angle (α) between 0° and 45°. This parameter modification controls lithium ion distribution and prevents precipitation while allowing the layer to be extended elsewhere for improved energy density.