Metal-Air Cell High Energy Efficiency Mode
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Solution Overview
Problem
Rechargeable electrochemical cells are optimized for long charge/discharge cycles where reactant availability is a limiting factor, but they lack efficiency in handling short burst cycles, leading to suboptimal energy storage and release during intermittent power sources like solar or wind energy.
Innovation Solution
A metal-air electrochemical cell with a reversible nickel species that operates in high energy efficiency modes by utilizing a quad-functional electrode for both oxygen evolution and reduction, allowing for efficient recharge and discharge states with improved energy efficiency ratios through controlled potential regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the cell is optimized for long charge/discharge cycles, then reactant availability is improved, but energy efficiency deteriorates during short burst cycles
Solution Approach 1:
The patent implements dynamic operation modes that allow the cell to switch between standard mode (optimized for long cycles with oxygen evolution) and high energy efficiency mode (optimized for short bursts with reversible metal redox). The controller dynamically selects the appropriate mode based on the charge/discharge cycle duration and power source characteristics, enabling the system to adapt its electrochemical reactions to match the operational requirements.
Solution Approach 2:
The patent changes the electrochemical parameters by introducing a reversible metal (such as nickel) that can undergo rapid redox reactions. By controlling the potential of the air electrode to be cathodic of the oxygen evolution potential during charging and anodic of the oxygen reduction potential during discharging, the system switches between different reaction pathways - oxygen evolution/reduction for long cycles and reversible metal redox for short bursts - thereby optimizing energy efficiency for different operational scenarios.
2Ease of operation
If the cell uses standard recharge/discharge modes, then operational simplicity is maintained, but energy efficiency during short burst cycles deteriorates
Solution Approach 1:
The air electrode is designed with multi-functionality, serving both as an oxygen electrode (for standard modes) and a reversible metal electrode (for high energy efficiency modes). This universal electrode can perform multiple electrochemical reactions - oxygen evolution, oxygen reduction, and reversible metal redox - allowing the cell to operate in different modes without requiring separate electrodes or complex mechanical switching, thereby maintaining operational simplicity while improving energy efficiency.
3Quantity of substance
If the cell is designed for long charge/discharge cycles, then reactant availability is improved, but device complexity increases to handle multiple operation modes
Solution Approach 1:
The controller uses feedback from the power source characteristics and operational conditions to determine the appropriate charge/discharge mode. By monitoring the power source output and load requirements, the controller automatically selects between standard and high energy efficiency modes, managing the complexity through intelligent control algorithms that adapt to real-time conditions without requiring complex mechanical or structural modifications to the cell.
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 cell achieves significantly higher energy efficiency during short burst cycles, with efficiency ratios of 75% to 95%, compared to standard modes, by optimizing nickel species oxidation and reduction processes, enhancing energy storage and release capabilities.
Implementation Method 1
oxidation of the metal fuel at the fuel electrode and reduction of the reducible species of the reversible metal, if present, to the oxidizable species thereof generates a potential difference for outputting current
Implementation Method 2
reduction of a reducible species of the metal fuel on the fuel electrode and oxidizing the oxidizable species of the reversible metal, if present, to the reducible species thereof
Implementation Method 3
an ionically conductive medium for conducting ions among the plurality of electrodes
Implementation Method 4
evolution of oxygen from the ionically conductive medium at the oxygen evolving electrode
Implementation Method 5
reduction of oxygen from the oxygen source at the air electrode generates a potential difference for outputting current
Data Source
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AI summary
The present invention relates to a metal-air electrochemical cell with a fuel electrode and an electrode functioning as air electrode, reversible metal electrode and oxygen evolving electrode; and a controller configured to operate in standard charging and recharging modes and high energy efficiency charging and recharging modes.