Electrochemical Cell Conditioning via Segmented Fuel Electrode Reset
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Solution Overview
Problem
Electrochemical cells with electrodeposited metal fuel face issues of non-uniform charge/discharge and electrode passivation due to high metal fuel ion concentrations, leading to premature formation of dendrites and reduced charge capacity.
Innovation Solution
A process involving grouping electrochemical cells into charged and reset groups, with controllers regulating the concentration of reducible metal fuel ions in the ionically conductive medium to maintain a predetermined state of charge, thereby preventing passivation and removing dendritic formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high concentrations of metal fuel ions are present in the electrolyte during discharge, then the charge capacity increases, but electrode passivation and non-uniform charge/discharge occur
Solution Approach 1:
The patent divides the cell system into multiple individual cells, each with its own fuel electrode and ionically conductive medium. By operating cells in parallel and controlling their states independently, the system manages metal ion concentrations more effectively, preventing passivation while maintaining high charge capacity.
Solution Approach 2:
The patent controls the state of charge of fuel electrodes to regulate metal fuel ion concentrations in the electrolyte. By adjusting parameters such as charge/discharge rates and maintaining electrodes at predetermined states of charge, the system optimizes ion concentration to prevent passivation while maximizing charge capacity.
2Quantity of substance
If metal fuel is electrodeposited at the fuel electrode during charge mode, then the metal fuel is stored for future discharge, but dendrite formation occurs causing premature electrical connections
Solution Approach 1:
By dividing the system into multiple cells with separate fuel electrodes, the patent distributes the electrodeposition process across multiple surfaces. This reduces the current density on each individual electrode, promoting more uniform metal fuel deposition and minimizing dendrite formation.
Solution Approach 2:
The patent implements periodic charge and reset cycles for fuel electrodes. During reset cycles, electrodes are held at predetermined states of charge to allow controlled dissolution of metal fuel, preventing excessive buildup and dendrite formation while maintaining adequate fuel storage capacity.
3Quantity of substance
If the concentration of reducible metal fuel ions increases towards saturation during discharge, then more fuel is available for oxidation, but non-uniform charge/discharge behavior results
Solution Approach 1:
The patent uses multiple cells with individual fuel electrodes to distribute the electrochemical reactions. This segmentation allows better control of ion concentration gradients and current distribution, maintaining more uniform charge/discharge behavior even at high metal fuel ion concentrations.
Solution Approach 2:
The patent employs controllers that monitor the state of charge of fuel electrodes and regulate the charge/discharge processes. By using feedback control to maintain electrodes at predetermined states of charge, the system prevents excessive metal ion concentration buildup and ensures uniform charge/discharge behavior.
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 approach effectively minimizes passivation, maintains cell efficiency, and extends the cycling life of electrochemical cells by controlling metal fuel ion concentrations and resetting electrodes to prevent build-up and shorts.
Implementation Method 1
oxidize the metal fuel at the fuel electrode and reduce an oxidant at the oxidant electrode to generate an electrical discharge current
Implementation Method 2
oxidize the metal fuel at the fuel electrode and reduce an oxidant at the oxidant electrode to generate an electrical discharge current
Implementation Method 3
reduce a reducible species of the fuel to electrodeposit the fuel on the fuel electrode
Implementation Method 4
reduce a reducible species of the fuel to electrodeposit the fuel on the fuel electrode and oxidize an oxidizable species of the oxidant by application of an electrical charge current
Implementation Method 5
an ionically conductive medium communicating the cells of the electrochemical cell system for conducting ions to support electrochemical reactions at the fuel, oxidant, and charging electrodes
Data Source
AI summary
A process for conditioning an electrochemical cell system comprising at least two electrochemical cells comprises selecting from the fuel electrodes of the electrochemical cells groups comprising: a charged group and a reset group. The process also comprises holding the fuel electrodes within the charged group at a predetermined state of charge associated with a set concentration of metal fuel ions in solution in the ionically conductive medium. The process further comprises resetting the fuel electrodes within the reset group. An electrochemical cell system includes a plurality of fuel electrodes and one or more controllers configured to regulate the concentration of reducible metal fuel ions in solution with an ionically conductive medium by maintaining a predetermined state of charge of at least one of the fuel electrodes, and initiate a charging, discharging, or resetting process on at least one other fuel electrode. Other features and embodiments are also disclosed.