Porous Insulating Member for Uniform Alkali Metal Doping
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Solution Overview
Problem
The continuous method for pre-doping electrodes with alkali metal in batteries and capacitors often results in defective solid electrolyte interface (SEI) coating films and alkali metal precipitation, leading to quality issues.
Innovation Solution
A doping system is introduced that includes a porous insulating member between the electrode precursor and the counter electrode unit, along with an elastically deformable pressing unit and multiple electrolytic solution tanks, to control alkali metal doping and prevent damage, ensuring high-quality electrode manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous type method is used for pre-doping, then productivity is improved, but manufacturing precision deteriorates due to local pre-doping progress causing defective SEI coating film and alkali metal precipitation
Solution Approach 1:
The patent introduces a porous insulating member that creates local electrical insulation in specific regions between the electrode precursor and counter electrode unit. This local insulation prevents excessive local pre-doping progress in certain areas, ensuring uniform doping throughout the electrode and preventing defective SEI coating film formation and alkali metal precipitation, while maintaining continuous production capabilities
Solution Approach 2:
The porous insulating member acts as an intermediary element between the electrode precursor and counter electrode unit. It mediates the doping process by controlling electrical contact and ion transport, allowing uniform alkali metal doping while preventing localized excessive doping that would cause quality defects in continuous manufacturing
2Manufacturing precision
If the electrode precursor is allowed to contact the counter electrode unit, then doping amount control is improved, but the electrode precursor may be damaged due to excessive contact or approach
Solution Approach 1:
The porous insulating member serves as a mediator that enables controlled interaction between the electrode precursor and counter electrode unit. It allows sufficient electrical contact for precise doping amount control while physically preventing excessive contact or approach that would cause electrode damage, thus resolving the contradiction between doping precision and electrode integrity
3Productivity
If the electrode precursor approaches the counter electrode unit excessively, then doping efficiency is improved, but the electrode precursor may be damaged
Solution Approach 1:
The porous insulating member creates localized electrical insulation in specific regions, preventing excessive approach of the electrode precursor to the counter electrode unit. This local control maintains sufficient doping efficiency through controlled ion transport while preventing physical damage from excessive contact, balancing productivity and electrode integrity
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 system effectively controls alkali metal doping, prevents electrode damage, and enhances the quality of electrodes by stabilizing electrical connections and optimizing doping conditions, resulting in high-quality electrodes for batteries and capacitors.
Implementation Method 1
a porous insulating member which is disposed between the electrode precursor and the counter electrode unit and is not in contact with the electrode precursor
Implementation Method 2
an active material in a strip-shaped electrode precursor having a layer including the active material is doped with alkali metal
Data Source
AI summary
Provided is a doping system in which an active material in a strip-shaped electrode precursor having a layer including an active material is doped with alkali metal. The doping system includes a doping tank, a conveying unit, a counter electrode unit, a connection unit, and a porous insulating member. The doping tank accommodates a solution including alkali metal ions. The conveying unit conveys the electrode precursor along a path passing through the inside of the doping tank. The counter electrode unit is accommodated in the doping tank. The connection unit electrically connects the electrode precursor and the counter electrode unit. The porous insulating member is disposed between the electrode precursor and the counter electrode unit, and is not in contact with the electrode precursor.