Surfactant-Treated Battery Separator for Faster Electrolyte Wetting
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Solution Overview
Problem
The permeability of electrolytic solutions through separators in batteries decreases when the packing density of electrode active materials is increased, leading to inefficiencies in liquid injection operations.
Innovation Solution
A method of manufacturing a separator by immersing it in a liquid containing a surfactant and then drying it, which enhances the separator's permeability for electrolytic solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the packing density of electrode active material is increased by pressing the electrode, then energy density is improved, but permeability of electrolytic solution decreases
Solution Approach 1:
The separator is treated with a surfactant solution to modify its surface properties, creating a porous structure that maintains high permeability for electrolytic solution while allowing the electrode to achieve high packing density. The surfactant-modified separator provides adequate ion transport pathways even when electrodes are densely packed.
Solution Approach 2:
The permeability of the separator is enhanced by changing its surface parameters through surfactant treatment. The surfactant modifies the surface energy and wettability of the separator, improving electrolytic solution penetration without compromising the structural integrity needed for high-density electrode packing.
2Loss of time
If permeability of electrolytic solution is improved by surfactant treatment of separator, then impregnation time is shortened, but manufacturing process complexity increases
Solution Approach 1:
The separator is pre-treated with surfactant solution before battery assembly, so that when the electrolytic solution is later introduced, it rapidly penetrates the electrode structure. This preliminary modification of the separator's surface properties eliminates the need for extended impregnation time during battery manufacturing.
Solution Approach 2:
The surfactant acts as an intermediary substance that facilitates the interaction between the electrolytic solution and the separator structure. By introducing this intermediate agent during separator manufacturing, the system achieves rapid electrolyte distribution without requiring complex manufacturing equipment or multi-step processes.
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 method significantly shortens the impregnation time of electrolytic solutions into electrode bodies, thereby improving the efficiency of liquid injection operations.
Implementation Method 1
immersing a separator in a liquid that contains a surfactant
Implementation Method 2
the permeability of the electrolytic solution decreases... the impregnation time of an electrolytic solution into an electrode is shortened
Data Source
AI summary
A method of manufacturing a separator that is disposed between a positive electrode and a negative electrode, the method including immersing a separator in a liquid that contains a surfactant; and drying the separator that has been removed from the liquid.