Zinc-Air Battery Separator with Potassium Ion Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In zinc-air batteries, potassium hydroxide reacts with oxygen, leading to potassium ion precipitation, which damages the carbon layer and degrades battery performance, making it difficult to use as a secondary battery.
Innovation Solution
A porous separation membrane with through-holes smaller than potassium ions, combined with an adsorptive potassium ion particle layer, prevents potassium ions from passing through and precipitating at the positive electrode, thereby stabilizing the battery's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator allows ion transport, then the battery can operate, but potassium ions pass through and precipitate at the positive electrode causing carbon layer destruction
Solution Approach 1:
The patent uses a porous separation membrane with controlled pore size (smaller than potassium ion diameter) to physically block potassium ions while allowing smaller hydroxide ions to pass through. This resolves the contradiction by selecting a material with specific porosity characteristics that enable selective ion transport.
Solution Approach 2:
The separation membrane acts as an intermediary component between the positive and negative electrodes, mediating ion transport while preventing harmful potassium ion migration. The membrane introduces a new element that facilitates desirable ion flow while blocking undesirable species.
2Productivity
If the through-holes are large enough for ion transport, then the battery can function, but potassium ions can pass through and react with oxygen causing carbon layer destruction
Solution Approach 1:
The separation membrane employs porous structure with precisely controlled pore dimensions that are smaller than potassium ions but sufficient for hydroxide ion transport. This maintains productivity through adequate ion flow while preventing potassium ion passage that would lead to carbon layer loss.
Solution Approach 2:
The patent applies local quality by creating regions with different properties: the separation membrane has specific pore size characteristics in the ion transport path to block potassium ions, while maintaining overall battery functionality. The localized modification of the separation membrane structure achieves selective transport.
3Power
If potassium hydroxide reacts with oxygen, then the battery operates, but potassium ions precipitate from the reaction structure degrading battery performance
Solution Approach 1:
The separation membrane serves as an intermediary that allows necessary ion transport for battery operation while blocking potassium ions from reaching the positive electrode where they would precipitate and destroy the carbon layer, enabling secondary battery functionality.
Solution Approach 2:
The porous separation membrane with pore sizes smaller than potassium ions enables selective transport, allowing the battery to operate through hydroxide ion movement while preventing potassium ion precipitation that would degrade performance and prevent rechargeability.
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 solution effectively prevents potassium ion precipitation, minimizing carbon layer destruction and maintaining battery performance, allowing the zinc-air battery to function as a reliable secondary battery.
Implementation Method 1
a plurality of adsorptive potassium ion particles are evenly attached on at least one side of the separation membrane to form an adsorptive potassium ion particle layer
Implementation Method 2
the separation membrane, which is a porous separation membrane having a plurality of through-holes, is provided with through-holes, the size of which is smaller than the size of the potassium ions contained in the electrolyte
Data Source
AI summary
A zinc-air secondary battery includes a positive electrode, a negative electrode, a separation membrane interposed between the positive and negative electrodes, and an electrolyte accommodated between the positive and negative electrodes and submerging a part of the positive electrode. The separation membrane is a porous separation membrane having a plurality of through-holes, and the separation membrane is provided with through-holes. The sizes of the holes are smaller than the size of the potassium ions contained in the electrolyte. A plurality of adsorptive potassium ion particles are evenly attached on at least one side of the separation membrane to form an adsorptive potassium ion particle layer.