Solid-State Battery Electrolyte Columns for Interfacial Impedance
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Solution Overview
Problem
Conventional solid-state batteries face high interfacial impedance and low energy density due to limited contact surface area between the solid electrolyte and active material, which is exacerbated by the poor conductance of solid polymer electrolytes near room temperature.
Innovation Solution
The implementation of solid-state batteries with an electrolyte structure featuring anode-side and cathode-side columns made of a solid ion conductor, reducing the weight percentage of electrolyte required from 50% to 20-30%, and using active materials like graphite or silicon encapsulated in ion conductors to enhance lithium ion transfer and mechanical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid polymer electrolyte is used to eliminate liquid electrolyte risks, then safety and space are improved, but ionic conductivity and battery performance deteriorate
Solution Approach 1:
The patent uses a composite solid electrolyte structure combining polymer matrix with ceramic particles (such as Li2SiO3, Li3PO4, or Al2O3) to achieve both safety and high ionic conductivity. The ceramic particles provide ion conduction pathways while the polymer provides mechanical flexibility, resolving the contradiction between safety and ionic conductivity.
Solution Approach 2:
The patent employs porous structures in the solid electrolyte with controlled porosity (30-70%) to increase the surface area for lithium ion transfer. The porous architecture provides more conduction pathways while maintaining the solid-state safety advantages, thus improving ionic conductivity without sacrificing safety.
2Ease of manufacture
If traditional solid electrolyte structure is used, then manufacturing is simplified, but interfacial impedance increases due to limited contact surface area
Solution Approach 1:
The patent introduces porous structures in the solid electrolyte layer with porosity ranging from 30% to 70%, which dramatically increases the contact surface area between electrolyte and active material. This porous architecture maintains manufacturing simplicity while reducing interfacial impedance by providing numerous ion transfer pathways.
Solution Approach 2:
The patent transitions from a traditional planar solid electrolyte interface to a three-dimensional porous network structure. This dimensional transformation increases the effective contact area without complicating the manufacturing process, as the porous structure can be formed through conventional techniques like sintering or phase separation.
3Power
If more solid electrolyte is used to increase contact surface area, then interfacial impedance is reduced, but energy density decreases due to higher electrolyte weight percentage
Solution Approach 1:
The patent uses porous solid electrolyte structures with optimized porosity (30-70%) to maximize contact surface area while minimizing electrolyte material consumption. The porous architecture provides extensive internal surface area for ion transfer without proportionally increasing the overall electrolyte mass, thus reducing interfacial impedance while maintaining energy density.
Solution Approach 2:
The patent segments the solid electrolyte into a network of porous channels and struts, creating distributed contact points throughout the electrode structure. This segmentation increases the effective interfacial area for lithium ion transfer while using less electrolyte material overall, resolving the contradiction between reducing interfacial impedance and maintaining energy density.
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 reduces interfacial impedance and increases energy density by allowing a greater thickness of active material while maintaining mechanical and electrochemical stability, resulting in improved battery performance.
Implementation Method 1
anode active material composed of anode active particles each encapsulated in a solid ion conductor
Implementation Method 2
solid polymer electrolytes conduct ions sparingly
Data Source
AI summary
A solid-state battery includes an anode current collector and an anode layer on the anode current collector. The anode layer comprises anode active material composed of anode active particles each encapsulated in a solid ion conductor. The solid-state battery also includes a cathode current collector and a cathode layer on the cathode current collector. The cathode layer comprises cathode active material composed of cathode active particles each encapsulated in the solid ion conductor. A solid electrolyte structure separating the anode layer and the cathode layer has anode-side columns and cathode-side columns aligning parallel to a stacking axis of the solid-state battery, the anode-side columns extending into the anode layer and the cathode-side columns extending into the cathode layer.