Organic Negative Electrodes in Rechargeable Alkaline Batteries
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Solution Overview
Problem
Nickel/metal hydride (Ni-MH) batteries face high costs due to rare earth metals and suffer from self-discharge and poor low-temperature performance issues related to hydrogen-absorbing alloys used in their negative electrodes.
Innovation Solution
The development of rechargeable alkaline batteries utilizing an aqueous, nonflammable alkaline electrolyte with organic materials as the negative electrode, such as poly(anthraquinonyl sulfide) (PAQS), which replaces hydrogen-absorbing alloys, enhancing cost-effectiveness and low-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrogen-absorbing alloys containing rare earth metals are used in Ni-MH batteries, then the battery capacity and energy density are improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive rare earth metal-containing hydrogen-absorbing alloys with organic materials that are cheaper and more abundant, accepting that the organic materials may have shorter operational lifetimes but achieving cost-effectiveness for large-scale energy storage applications
Solution Approach 2:
The patent changes the fundamental material parameter from inorganic metal alloys to organic compounds, utilizing the redox properties of organic molecules (such as quinone-hydroquinone transitions) to achieve electrochemical energy storage without rare earth metals
2Quantity of substance
If hydrogen-absorbing alloys are used in Ni-MH batteries, then the battery achieves adequate capacity, but self-discharge rate increases and low-temperature performance deteriorates
Solution Approach 1:
The organic electrode materials avoid the intrinsic self-discharge problems of metal hydride alloys by using stable organic molecules with well-defined redox couples, eliminating the need to maintain hydrogen pressure and reducing parasitic reactions
Solution Approach 2:
The patent changes the electrochemical mechanism from hydrogen absorption/desorption in metal alloys to direct electron transfer in organic redox couples, enabling faster reaction kinetics and better low-temperature performance through solution-like electron mobility in organic materials
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 solution reduces the cost of Ni-MH batteries by eliminating the need for rare earth metals, improves low-temperature performance, and minimizes self-discharge, making them more viable for electric vehicles and hybrid electric vehicles.
Implementation Method 1
the negative electrode may be an organic carbonyl polymer... the energy storage device may utilize an organic material as the negative electrode, such as, but not limited to, poly(anthraquinonyl sulfide) (PAQS)
Data Source
AI summary
An energy storage device may provide a positive electrode, an electrolyte, and a negative electrode. The energy storage device may utilize an aqueous alkaline electrolyte, which may be nonflammable. The energy storage device may utilize organic material(s) as the negative electrode, such as, but not limited to, poly(anthraquinonyl sulfide) (PAQS), organic carbonyl compounds, organosulfur compounds, redox polymers, or radical polymers.