Solid-State Battery Cathode Layout for Low Interfacial Resistance
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Solution Overview
Problem
Existing all-solid-state batteries face challenges with reduced rapid charge/discharge performance due to increased interfacial resistance caused by reducing solid-state electrolyte particle size to increase contact area.
Innovation Solution
Incorporating a positive electrode layer with distinct areas: one adjacent to the electrolyte layer containing needle-like solid-state electrolyte particles and another adjacent to the current collector with spherical solid-state electrolyte particles, optimizing aspect ratios and mixing ratios to enhance ion transfer and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If solid-state electrolyte particle size is reduced to increase contact area, then contact area between electrode and electrolyte is improved, but interfacial resistance increases resulting in decreased rapid charge/discharge performance
Solution Approach 1:
The patent applies local quality by using two distinct types of solid-state electrolyte particles in different regions of the positive electrode layer. Needle-like particles are specifically placed in the first area adjacent to the electrolyte layer to maximize contact area, while spherical particles are used in the second area adjacent to the current collector. This spatial differentiation of particle morphology optimizes local contact characteristics without compromising overall battery performance.
Solution Approach 2:
The patent employs composite materials by combining two different shapes of solid-state electrolyte particles (needle-like and spherical) within the same positive electrode layer. This composite approach leverages the advantages of both particle types: needle-like particles provide enhanced contact area with the electrolyte layer, while spherical particles maintain good packing density and electrical conductivity, thereby resolving the contradiction between contact area and interfacial resistance.
2Productivity
If needle-like solid-state electrolyte particles are used to increase contact area, then ion transfer is enhanced, but manufacturing complexity increases due to particle shape control
Solution Approach 1:
The patent applies segmentation by dividing the positive electrode layer into two distinct areas with different particle type distributions. The first area near the electrolyte layer contains predominantly needle-like particles for optimized ion transfer, while the second area near the current collector contains spherical particles. This segmentation allows each region to be optimized for its specific function while simplifying the overall manufacturing process compared to attempting to control particle shapes uniformly throughout.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves rapid charge/discharge performance and capacity of the battery by increasing the contact area and reducing ionic resistance through strategic use of needle-like and spherical electrolyte particles.
Implementation Method 1
ion transport occurs through physical contact between the positive or negative electrode and the solid-state electrolyte
Data Source
AI summary
The present invention relates to an all-solid-state battery comprising: a negative electrode, an electrolyte layer, and a positive electrode including positive electrode layer and a current collector supporting the positive electrode layer, wherein the positive electrode layer includes a first area adjacent to the electrolyte layer and a second area adjacent to the positive electrode current collector, the first area includes first solid-state electrolyte particles, the second area includes second solid-state electrolyte particles, and the first solid-state electrolyte particles are needle-like solid-state electrolyte particles.