Anion-Conducting Polymer Membrane for Battery Ion Selectivity
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Solution Overview
Problem
Conventional battery designs face issues with electrode ion diffusion leading to capacity loss and degradation, exacerbated by separator porosity, which results in dendrite formation and reduced cycle life.
Innovation Solution
Incorporation of a polymeric material with a cationic backbone that selectively allows anionic transport while limiting cationic transport, reducing metal ion diffusion and enhancing hydroxide ion distribution, thereby reducing dendrite formation and impedance growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If separator porosity is increased to maintain electrolyte movement, then electrolyte transport is improved, but electrode ion diffusion increases leading to capacity loss and electrode degradation
Solution Approach 1:
The patent applies local quality by creating a polymeric coating layer with specific properties (anion conductivity, cation blocking) that is selectively applied to the separator surface. This localized modification allows the separator to simultaneously maintain electrolyte transport while blocking harmful metal ion diffusion, resolving the contradiction between electrolyte movement and electrode protection
Solution Approach 2:
The patent uses composite materials by combining the base separator material with a functional polymeric coating layer. The composite structure integrates the porous substrate for electrolyte transport with the ion-selective polymer layer that blocks metal ions, achieving both electrolyte movement and electrode protection simultaneously
2Quantity of substance
If separator porosity is increased to maintain electrolyte movement, then electrolyte transport is improved, but dendrite formation increases
Solution Approach 1:
The polymeric coating is applied locally to the separator surface to create a selective barrier that blocks metal ion diffusion (which leads to dendrites) while maintaining electrolyte transport, thus preventing dendrite formation without compromising electrolyte movement
Solution Approach 2:
The polymeric coating acts as an intermediary layer between the electrolyte and the electrode/separator interface. It mediates ion transport by allowing hydroxide ions to pass while blocking metal ions, thereby preventing the conditions that lead to dendrite formation
3Reliability
If metal ion diffusion is limited to maintain electrode integrity, then electrode degradation is reduced, but electrolyte transport may be hindered
Solution Approach 1:
The patent changes the parameter of ion selectivity by using a polymeric material with specific chemical properties (cationic backbone with anionic functional groups) that creates selective permeability. This allows the coating to block metal ions while permitting hydroxide ion transport, maintaining both electrode integrity and electrolyte movement
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 improves water and electrolyte transport within the cell, increases cycle life, and maintains electrode integrity by limiting metal ion transmission, leading to enhanced battery performance and capacity retention.
Implementation Method 1
The polymeric material may be configured to selectively provide anionic transport across the polymeric material while limiting cationic transport across the polymeric material
Implementation Method 2
The polymeric material may be configured to provide transport of hydroxide anions across the polymeric material while limiting transport of metal-containing anionic complexes across the polymeric material
Implementation Method 3
The polymeric material may be characterized by a diffusion ratio of water relative to metal ions of greater than 1,000
Data Source
AI summary
Energy storage devices, battery cells, and batteries of the present technology may include a first current collector and a second current collector. The batteries may include an anode material coupled with the first current collector. The batteries may include a cathode material coupled with the second current collector. The batteries may also include a polymeric material coupled between the cathode material and the anode material. The polymeric material may be characterized by a cationic backbone. The polymeric material may be configured to selectively provide anionic transport across the polymeric material while limiting cationic transport across the polymeric material.