Alkali Metal Intercalation Electrodes for Stable Solid Electrolyte Membranes
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Solution Overview
Problem
Conventional electrolytic cells with solid alkali ion conductive membranes face inefficiencies due to high voltage drop and membrane degradation from low pH acids or high pH bases, leading to reduced performance or inoperability.
Innovation Solution
A solid alkali metal-based secondary battery design featuring an anolyte compartment with a negative electrode and a catholyte compartment separated by a solid alkali metal ion conductive electrolyte membrane, where both electrodes include alkali metal intercalation materials, specifically sodium or lithium, directly in contact with the membrane, and optionally coated with carbon to maintain membrane stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic cells use solid alkali ion conductive membranes, then ion selectivity and water impermeability are achieved, but voltage drop increases and membrane degradation occurs
Solution Approach 1:
The patent introduces an intermediary layer (such as a coating layer or intermediate material) between the alkali ion conductive membrane and the electrolyte solution. This intermediary acts as a mediator that reduces direct chemical interaction between the membrane and aggressive electrolyte species, thereby reducing membrane degradation while maintaining ion transport efficiency and reducing voltage drop.
Solution Approach 2:
The patent employs composite material structures where the alkali ion conductive membrane is combined with other materials (such as protective coatings, support layers, or interfacial materials) to create a composite electrode-membrane system. This composite structure enhances overall cell performance by reducing voltage drop through improved interfacial contact and protecting the membrane from degradation.
2Reliability
If solid alkali ion conductive membranes are used to separate compartments, then chemical separation is achieved, but membrane degradation from pH extremes occurs
Solution Approach 1:
The patent applies preliminary protective measures to the membrane before it is exposed to degrading pH conditions. This includes pre-coating the membrane with protective layers or pre-treating the membrane surface to create resistance against chemical degradation from low pH acids or high pH bases, thereby preventing membrane degradation before it occurs.
Solution Approach 2:
The patent introduces an intermediary protective layer between the membrane and the aggressive pH environment. This intermediary material shields the membrane from direct contact with degrading chemicals while still allowing alkali ion transport, thereby preventing membrane degradation from pH extremes.
3Productivity
If electrodes are placed in direct contact with the membrane, then ion transport efficiency is improved, but membrane degradation accelerates
Solution Approach 1:
The patent introduces an intermediary layer between the electrode and the membrane that serves dual functions: it maintains efficient ion transport pathways while simultaneously protecting the membrane from degradation caused by direct electrode contact. This intermediary material allows ions to pass through efficiently while acting as a protective barrier.
Solution Approach 2:
The patent applies different materials or properties to different regions of the electrode-membrane interface. The local quality of the interfacial material is optimized to provide both high ion conductivity where needed and protective characteristics where degradation risks are highest, thereby maintaining productivity while improving reliability.
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 configuration reduces voltage drop and maintains membrane stability, enhancing the efficiency and operational longevity of the electrolytic cell by allowing efficient alkali ion transport while preventing membrane degradation.
Implementation Method 1
a solid alkali metal ion conductive electrolyte membrane that separates the anolyte compartment from the catholyte compartment
Implementation Method 2
alkali ion selective membrane in an electrolytic cell, alkali ions are allowed to pass between the cell's anolyte compartment and catholyte compartment while other chemicals are maintained in their original compartments
Implementation Method 3
at least one electrode that includes an alkali metal intercalation material
Data Source
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AI summary
The present invention provides an electrochemical cell (10) that includes an anolyte compartment (15) housing an anode electrode (20); a catholyte compartment (25) housing a cathode electrode (30); and a solid alkali ion conductive electrolyte membrane (35) separating the anolyte compartment (15) from the cathode compartment (25). In some cases, the electrolyte membrane (35) is selected from a sodium ion conductive electrolyte membrane and a lithium ion conductive membrane. In some cases, the at least one of anode (20) or the cathode (30) includes an alkali metal intercalation material.