3D Porous Lithium Electrode for Solid-State Battery Interfacial Resistance
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Solution Overview
Problem
Lithium metal batteries face challenges in securing an ion conduction path and reducing interfacial resistance between the electrode active material and solid electrolyte, particularly in lithium metal batteries where lithium metal is used as the negative electrode.
Innovation Solution
A lithium electrode with a solid high-ionic conductor having a 3D porous structure is used, where lithium metal or alloy is filled in the pores, and a collector is coupled onto the surface, with optional coating of reaction activating materials like Al, In, or ceramic materials to enhance interfacial reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a solid electrolyte is applied to an electrode in the form of powder, then the ionic conductivity is improved, but the interfacial resistance between electrode active material and solid electrolyte increases
Solution Approach 1:
The patent applies a porous coating layer on the solid electrolyte surface with controlled porosity (30-80%) and pore size (0.1-10 μm). This porous structure increases the contact area between solid electrolyte and electrode active material, improving interfacial contact and reducing interfacial resistance while maintaining high ionic conductivity through the solid electrolyte bulk.
Solution Approach 2:
The patent transitions from a flat, two-dimensional solid electrolyte surface to a three-dimensional porous structure. This dimensional change creates multiple contact pathways and increases the effective surface area for ionic exchange, simultaneously achieving low interfacial resistance and high ionic conductivity.
2Quantity of substance
If lithium metal is used as negative electrode, then the capacity is improved, but securing an ion conduction path becomes difficult
Solution Approach 1:
The porous coating layer on the solid electrolyte surface provides a three-dimensional ion conduction pathway that facilitates lithium ion transport. The porous structure with optimized pore size and distribution enables efficient ion conduction while accommodating the high capacity lithium metal anode, solving the ion conduction path security issue.
Solution Approach 2:
The porous coating layer acts as an intermediary between the solid electrolyte and lithium metal anode. It mediates the interface interaction, providing both mechanical contact and ionic conduction pathways, enabling high capacity lithium metal to function reliably with solid electrolyte.
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
This configuration increases the shelf life and ionic conductivity of lithium metal batteries, improving charging and discharging characteristics and output performance by securing an ion conduction path and maximizing the use of lithium.
Implementation Method 1
a solid high-ionic conductor having a 3D porous structure... increases the shelf life and ionic conductivity of lithium metal batteries... securing an ion conduction path
Data Source
AI summary
Disclosed are a lithium electrode for a lithium metal battery, which uses a solid high-ionic conductor having a three-dimensional (3D) porous structure, wherein a lithium metal or lithium alloy is filled into each pore and dispersed, and a method for manufacturing the lithium electrode. By applying a solid high-ionic conductor having a 3D porous structure, an ion conduction path is secured in the lithium electrode using the solid high-ionic conductor instead of a conventional liquid electrolyte, electrical-chemical reactivity in charging and discharging are further improved, and shelf life and high rate capability are enhanced.