Lithium Air Battery Solid Electrolyte Current Control
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Solution Overview
Problem
Lithium air batteries face performance degradation due to the requirement of organic and aqueous electrolytic solutions on the positive electrode surface, leading to volatilization and inefficiencies in charge-discharge reactions.
Innovation Solution
The lithium air battery system incorporates a solid electrolyte and a controller for current control, utilizing a laminate structure with a Ti electrode and a Pt electrode for oxygen reduction, and a humidity adjuster to manage the gas atmosphere, optimizing the generation and decomposition of Li2O2 and LiOH reaction products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic and aqueous electrolytic solutions are used on the positive electrode surface, then charge-discharge reactions can proceed, but performance degradation occurs due to volatilization and inefficiencies
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid (organic and aqueous electrolytic solutions) to solid (solid electrolyte), eliminating volatilization issues while maintaining ionic conductivity for efficient charge-discharge reactions
Solution Approach 2:
The patent introduces a solid electrolyte as an intermediary between the negative electrode (lithium) and positive electrode (oxygen), enabling ion transport without the harmful volatilization properties of liquid electrolytes
2Reliability
If a solid electrolyte is used, then volatilization is eliminated and stability improves, but charge-discharge reaction efficiency may decrease without proper current control
Solution Approach 1:
The patent implements a controller that performs current control during discharge, using feedback mechanisms to optimize the electrochemical reactions at the electrodes, ensuring high reaction efficiency while maintaining the stability benefits of the solid electrolyte
Solution Approach 2:
The patent dynamically adjusts the discharge current through controller intervention, adapting the reaction conditions to maximize efficiency while working within the constraints of the solid electrolyte system
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 enhances the charge and discharge efficiency by controlling the discharge voltage to minimize energy loss and maintain a stable surface ion conductive layer, improving the overall energy density and stability of the lithium air battery.
Implementation Method 1
a solid electrolyte disposed between the negative electrode and the positive electrode and capable of conducting lithium ion
Implementation Method 2
a negative electrode capable of occluding and releasing lithium ion
Implementation Method 3
a positive electrode using oxygen as a positive electrode active material and reducing oxygen during discharge
Data Source
AI summary
The present disclosure provides an electrochemical device system including an electrochemical device and a controller. The electrochemical device includes a negative electrode capable of occluding and releasing lithium ion, a positive electrode using oxygen as a positive electrode active material and reducing oxygen during discharge, and a solid electrolyte disposed between the negative electrode and the positive electrode and capable of conducting lithium ion. The controller performs current control during discharge of the electrochemical device.