Solid-State Battery Electrolyte with Local Ion Conductivity
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Solution Overview
Problem
Solid-state batteries face safety concerns due to insufficient safety measures, particularly in preventing short circuits during charging and discharging processes.
Innovation Solution
A solid-state battery configuration with a cathode and anode layer alternately laminated with a solid electrolyte layer, featuring high and low ion conductivity portions to control ion movement and prevent excessive lithium ion discharge, thereby reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state battery uses a uniform solid electrolyte layer between cathode and anode layers, then the battery structure is simple and manufacturing is easier, but safety is insufficient due to risk of short circuits from excessive ion discharge
Solution Approach 1:
The solid electrolyte layer is divided into regions with different ion conductivities: a first region with high ion conductivity positioned between facing portions of cathode and anode layers for normal operation, and a second region with low ion conductivity positioned between non-facing portions to prevent excessive ion discharge and short circuits. This local differentiation of electrolyte properties enhances safety while maintaining functional performance.
Solution Approach 2:
The solid electrolyte layer is segmented into multiple functional regions with distinct ion conductivity characteristics. The first region facilitates efficient ion transport during charging and discharging, while the second region acts as a barrier to prevent ion discharge in areas where cathode and anode layers do not face each other, thereby preventing short circuits.
2Object-affected harmful factors
If a solid-state battery uses a solid electrolyte layer to prevent leakage, then leakage problems are solved, but safety concerns remain due to insufficient measures against short circuits
Solution Approach 1:
The solid electrolyte layer incorporates spatially varying ion conductivity to address different functional requirements: high ion conductivity in the first region enables normal battery operation, while low ion conductivity in the second region specifically prevents excessive ion discharge and short circuits in areas where electrodes do not face each other, thereby enhancing safety without compromising leakage prevention.
3Productivity
If the solid electrolyte layer has high ion conductivity throughout, then charge and discharge performance is improved, but safety deteriorates due to excessive ion discharge causing short circuits
Solution Approach 1:
The solid electrolyte layer exhibits spatially differentiated ion conductivity: the first region with high ion conductivity positioned between facing portions of cathode and anode layers ensures efficient charge and discharge performance, while the second region with low ion conductivity positioned between non-facing portions prevents excessive ion discharge and short circuits, thereby simultaneously achieving high productivity and reliability.
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 configuration enhances safety by suppressing the occurrence of short circuits and ensuring continuous normal operation of the battery, improving overall safety and performance.
Implementation Method 1
a solid electrolyte layer between the cathode layer and the anode layer and including a high ion conductivity portion in a first region in which the cathode layer and the anode layer face each other, and a low ion conductivity portion facing the cathode layer in a second region in which the cathode layer and the anode layer do not face each other
Data Source
AI summary
A solid-state battery that includes a cathode layer which occludes and discharges an electrode reactant ion, an anode layer which occludes and discharges the electrode reactant ion and partially faces the cathode layer, and a solid electrolyte layer between the cathode layer and the anode layer and including a high ion conductivity portion in a first region in which the cathode layer and the anode layer face each other, and a low ion conductivity portion facing the cathode layer in a second region in which the cathode layer and the anode layer do not face each other.