Mesh Cathode Substrate for High-Capacity All-Solid-State Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for increasing cathode thickness in all-solid-state lithium secondary batteries lead to decreased fast charging-discharging efficiency and reduced adhesion properties between the cathode and solid electrolyte, limiting battery capacity while maintaining a compact form.
Innovation Solution
A cathode substrate with a mesh-form base and a cathode layer formed by applying a slurry containing cathode active material, solid electrolyte, and conductive material, which is then dried and compressed to reduce thickness and enhance conductivity, allowing the substrate to act as both a support and cathode, thereby increasing battery capacity without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the cathode is increased to increase battery capacity, then the cathode capacity increases, but the fast charging-discharging efficiency decreases due to increased internal resistance
Solution Approach 1:
The invention transitions from a conventional planar cathode structure to a three-dimensional mesh-form cathode structure. The mesh configuration with interconnected strands creates multiple conduction pathways in three dimensions, allowing ions and electrons to travel shorter distances through the cathode material. This dimensional transformation enables increased cathode capacity while maintaining efficient charge-discharge rates by reducing the maximum conduction distance.
Solution Approach 2:
The cathode is divided into multiple thin mesh strands that are woven or interconnected to form a three-dimensional network. This segmentation creates numerous small, distributed active material regions rather than one large thick layer. Each strand acts as an independent conduction pathway, reducing internal resistance while collectively providing high cathode capacity through the aggregated surface area of all strands.
2Quantity of substance
If the thickness of the cathode is increased to increase battery capacity, then the cathode capacity increases, but the adhesion properties between the cathode and solid electrolyte decrease due to increased surface roughness
Solution Approach 1:
The mesh-form structure transforms the cathode from a flat two-dimensional surface to a three-dimensional network with controlled porosity. This dimensional change allows the cathode to maintain a relatively smooth external surface profile while incorporating significant cathode material volume within the mesh structure. The interconnected strands create a uniform surface topology that facilitates consistent solid electrolyte deposition and maintains strong interfacial adhesion.
Solution Approach 2:
The mesh-form cathode inherently creates a porous structure with controlled void spaces between the woven strands. This porosity allows the solid electrolyte to penetrate and conform to the cathode surface more effectively, increasing the actual contact area and improving adhesion properties. The porous architecture enables better mechanical interlocking and chemical bonding between the cathode and electrolyte interfaces.
3Quantity of substance
If the thickness of the cathode is increased to increase battery capacity, then the cathode capacity increases, but the conduction distance between electrode and cathode material increases
Solution Approach 1:
The mesh-form configuration transforms the cathode architecture from a planar layer to a three-dimensional network, fundamentally changing the conduction geometry. This dimensional transformation creates multiple parallel conduction pathways that significantly reduce the maximum distance ions and electrons must travel. The interconnected mesh strands provide numerous shortcut routes, ensuring that no point in the cathode is far from an electrode contact point.
Solution Approach 2:
By dividing the cathode into multiple thin mesh strands arranged in a three-dimensional configuration, the invention segments the conduction path into many short segments rather than one long path. Each strand maintains a small diameter and short length, ensuring that conduction distance within any single strand remains minimal. The collective arrangement of these segmented strands provides high capacity while keeping individual conduction distances short.
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
The solution effectively increases battery capacity by reducing the conduction distance between the electrode and cathode, improving electrical properties and maintaining efficiency while suppressing the thickness of the cathode, thus enhancing the overall performance of the all-solid-state battery.
Implementation Method 1
drying and compressing the cathode slurry
Implementation Method 2
drying and compressing the cathode slurry
Data Source
AI summary
Provided are a cathode substrate, a high capacity all-solid-state battery, and a method for manufacturing the same. The cathode substrate includes a base in a mesh form and a cathode formed on the base, wherein the cathode is configured to overlap the base. The present invention may resolve a conventional problem of deterioration in battery efficiency, which has been caused by a long distance between an electrode and a cathode, and may produce a high capacity all-solid-state battery while suppressing or preventing an increase in the thickness of the cathode.