Low-Temperature Liquid Metal Battery Using Hydroxide Electrolytes
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Solution Overview
Problem
Current liquid metal electrochemical cells for energy storage require high temperatures and expensive materials, making them unsuitable for efficient and cost-effective large-scale energy management, particularly in balancing energy supply and demand.
Innovation Solution
Development of an electrochemical system using abundant metals and hydroxide-based electrolytes that operates at lower temperatures (below 300°C), featuring three phases with distinct alkali metal electrodes and electrolytes, allowing for efficient energy storage and release while reducing material and assembly costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional liquid metal electrochemical cells are used for energy storage, then energy storage capacity is achieved, but operating temperature must be maintained at high levels and expensive materials are required
Solution Approach 1:
The patent changes the chemical composition parameters of the electrochemical cell by using hydroxide-based electrolytes (such as KOH or NaOH) instead of conventional molten salt electrolytes. This parameter change enables the cell to operate at lower temperatures (below 300°C) while maintaining energy storage capacity, as the hydroxide electrolyte has lower melting point and enables efficient ion conduction at reduced temperatures.
Solution Approach 2:
The patent employs composite material structures combining liquid metal electrodes (alkali metals like potassium or sodium) with hydroxide-based electrolytes. This composite system creates a new electrochemical environment that allows low-temperature operation while preserving the high energy storage capacity characteristic of liquid metal batteries. The specific combination of alkali metal + hydroxide electrolyte produces synergistic effects that enable both low temperature and high capacity.
2Quantity of substance
If conventional liquid metal electrochemical cells are used, then energy storage function is provided, but material costs and assembly costs increase
Solution Approach 1:
The patent substitutes expensive conventional electrolyte materials with cheaper hydroxide-based electrolytes (KOH, NaOH) that are commercially abundant and low-cost. This material substitution significantly reduces the bill of materials cost while maintaining the energy storage function. The use of inexpensive alkali metals (potassium, sodium) instead of rarer metals further reduces material costs.
Solution Approach 2:
By changing the electrolyte composition to hydroxide-based systems, the patent reduces material costs because hydroxides are among the cheapest electrochemical materials available. This parameter change in electrolyte chemistry directly translates to lower material procurement costs and simplified manufacturing processes.
3Quantity of substance
If conventional liquid metal electrochemical cells are deployed, then energy storage is achieved, but system longevity and efficiency are reduced due to high temperature operation
Solution Approach 1:
The patent changes the operating temperature parameter by using hydroxide-based electrolytes that enable efficient ion conduction at lower temperatures. This temperature reduction extends battery longevity because thermal degradation, material corrosion, and chemical decomposition all occur at reduced rates at lower temperatures. The system maintains energy storage capacity while operating at temperatures below 300°C, significantly improving durability.
Solution Approach 2:
The patent converts the potential harm of high temperature operation (which causes degradation and reduces longevity) into a benefit by using hydroxide electrolytes that actually require lower temperatures to function optimally. The lower operating temperature, which might seem like a limitation, actually becomes an advantage that extends battery life and improves efficiency while maintaining the desired energy storage capacity.
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 system significantly decreases costs and increases the suitability of liquid metal batteries for widespread deployment in power grids by operating at lower temperatures, enhancing their efficiency and longevity, and enabling economically feasible grid-storage solutions.
Implementation Method 1
electrochemical cell having an active alkali metal with three distinct phases... The alkali metal when present, resides at respective disparate chemical potentials in the first and third phases, originating a voltage between the first and third phases
Implementation Method 2
The second phase defines the electrolyte and includes one or more salts of the alkali metal and includes at least hydroxide anions
Implementation Method 3
electrochemical system has been developed that can operate at much lower temperatures than conventionally known liquid metal electrochemical cells... efficient energy storage and release
Data Source
AI summary
An electrochemical cell and its method of operation includes an electrolyte having a binary salt system of an alkali hydroxide and a second alkali salt. The anode, cathode, and electrolyte may be in the molten phase. The cell is operational for both storing electrical energy and as a source of electrical energy as part of an uninterruptible power system. The cell is particularly suited to store electrical energy produced by a renewable energy source.