Iron Negative Electrode Additives to Prevent Floataway and Fallout
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Solution Overview
Problem
Current energy storage technologies are limited in their ability to provide long and ultra-long duration energy storage solutions, particularly for electric power grids, as existing systems struggle to efficiently store energy for periods beyond 8 hours, necessitating the development of low-cost, scalable rechargeable battery chemistries.
Innovation Solution
The use of an additive for iron negative electrodes in alkaline electrochemical cells, comprising discrete granules of agglomerated metal sulfides, such as zinc sulfide, with specific particle size, density, and porosity characteristics, to enhance the performance and durability of the electrodes, allowing for improved energy storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If iron negative electrodes are used in alkaline electrochemical cells for long duration energy storage, then energy storage capacity and duration are improved, but electrode material degradation and floataway/fallout occur
Solution Approach 1:
Metal sulfide particles act as intermediary substances between the iron negative electrode and the alkaline electrolyte. These particles form a protective interface that prevents direct harmful interactions between the iron electrode and electrolyte, thereby reducing degradation and material loss while maintaining long duration energy storage capability
Solution Approach 2:
The invention changes the physical and chemical parameters of the electrode system by introducing metal sulfide particles with specific properties (particle size distribution, surface area, composition). This modifies the electrochemical environment to reduce iron dissolution and material degradation during prolonged operation
2Productivity
If fine particles are used to increase surface area and reactivity, then electrochemical performance is improved, but particle floataway and loss increase
Solution Approach 1:
The invention combines fine metal sulfide particles with larger support structures or aggregates them into controlled clusters. This merging approach maintains the high surface area benefits of fine particles for electrochemical reactivity while the larger composite structures prevent individual fine particles from floating away and being lost
Solution Approach 2:
The invention creates composite material structures where metal sulfide particles are integrated with other materials (such as conductive matrices or support particles) to form composite granules. These composites retain the high reactivity of fine metal sulfide particles while the composite structure provides mechanical stability and prevents particle loss
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 proposed solution enables the creation of iron negative electrodes with increased capacity and reduced floataway/fallout risk, facilitating efficient energy storage over extended durations, thereby addressing the limitations of existing energy storage systems.
Implementation Method 1
the discrete granules may have a first average apparent density, the particles including the at least one metal sulfide have a second average apparent density, and the first average apparent density is less than the second average apparent density. The discrete granules may have a friability of less than about 10% weight loss according to European Pharmacopoeia 2.9.41.-2 (Method B). solid-state bonding may hold at least some of the agglomerated particles together in the discrete granules possess solid state bonding between the agglomerated particles.
Implementation Method 2
at least some of the agglomerated particles of the discrete granules may be a metal-matrix composite bonded through infiltration.
Implementation Method 3
the discrete granules may include a binder, and at least some of the agglomerated particles of the discrete granules are bonded by the binder.
Data Source
AI summary
According to one aspect, an additive for an iron negative electrode of an alkaline electrochemical cell may include a powder of discrete granules including agglomerated particles, the agglomerated particles including at least one metal sulfide.