Graded Alloy Lithium Anode Layer for Dendrite Suppression

The patent applies local quality by creating a graded alloy layer where the composition varies spatially. The layer transitions from a Li-rich region adjacent to the Li metal layer (providing dendrite suppression) to a Li-poor region at the outer surface (minimizing dead weight). This gradient structure allows different regions to fulfill different functions optimally, resolving the contradiction between dendrite inhibition and electrical efficiency.

The patent employs parameter changes by systematically varying the lithium concentration parameter across the alloy layer thickness. The lithium content decreases gradually from the interface with the Li metal layer toward the outer surface, creating a continuous gradient. This parameter variation enables the layer to provide dendrite suppression where needed while minimizing the amount of non-conducting material, thus improving overall electrical efficiency.

The patent uses local quality by designing a composition gradient where the alloy composition is not uniform throughout. The Li-rich region provides high Li holding capacity, while the Li-poor region reduces dead weight. This spatial variation in composition allows the anode to achieve both high Li capacity and reduced inactive material, resolving the contradiction between quantity and homogeneity.

The alloy layer is effectively segmented into regions with different compositions. The gradient structure creates distinct zones: a Li-rich zone near the Li metal layer for capacity, and a Li-poor zone at the surface for efficiency. This segmentation allows each region to contribute differently to the overall performance, achieving both high Li holding capacity and reduced dead weight.