Laser-Etched Battery Electrodes for Ion Conductivity and Capacity
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Solution Overview
Problem
The increase in electrode density of secondary batteries to enhance capacity leads to reduced porosity, increased bending degree, and decreased ion conductivity, resulting in decreased power characteristics.
Innovation Solution
A manufacturing apparatus and method using a nanosecond laser to form a large number of conical-shaped holes in the electrode mixture with specific diameter and depth ratios, minimizing capacity loss while improving ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode density is enhanced to increase capacity, then capacity increases, but porosity is reduced and ion conductivity decreases
Solution Approach 1:
The patent applies porous materials by forming a controlled porous structure within the electrode mixture through laser irradiation. The laser creates voids and channels that increase porosity and create pathways for ion transport, directly addressing the contradiction between high density and ion conductivity by introducing a hierarchical porous architecture.
Solution Approach 2:
The patent applies dimensionality change by transitioning from a two-dimensional planar electrode structure to a three-dimensional hierarchical structure with vertical channels and pores. This adds depth and volume to the electrode architecture, creating multiple transport pathways that improve ion conductivity without sacrificing capacity.
2Quantity of substance
If electrode density is enhanced to increase capacity, then capacity increases, but bending degree increases and power characteristics decrease
Solution Approach 1:
The patent applies segmentation by dividing the dense electrode mixture into segmented regions separated by laser-formed channels and pores. This segmentation creates discrete pathways for ion transport, reducing the bending degree of ions through the electrode and improving power characteristics while maintaining high capacity.
Solution Approach 2:
The patent applies dimensionality change by creating vertical channels that extend through the electrode thickness, providing shortcuts for ion transport. This three-dimensional pathway system reduces the effective bending degree and transport path length, improving power characteristics without reducing capacity.
3Manufacturing precision
If laser irradiation is performed multiple times to form holes, then hole quality improves, but manufacturing time increases
Solution Approach 1:
The patent applies periodic action by using pulsed laser irradiation with optimized parameters to achieve the desired hole quality in a single pass or minimal passes. The periodic pulsed delivery of laser energy allows for precise control of material removal while minimizing total processing time.
Solution Approach 2:
The patent applies parameter changes by optimizing laser irradiation parameters (power, pulse duration, scanning speed, wavelength) to achieve high-quality hole formation in minimal passes. By adjusting these parameters, the process achieves both high manufacturing precision and improved productivity.
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 enhances ionic conductivity and power characteristics of secondary batteries by forming optimized holes through laser etching, maintaining capacity and reducing bending degree.
Implementation Method 1
a laser unit in which the electrode mixture is subjected laser etching to form a large number of holes having a level difference in thickness
Data Source
AI summary
Provided are a manufacturing apparatus and a manufacturing method of an electrode for a secondary battery which forms a large number of holes in the electrode mixture having a level difference in thickness, by irradiating twice or less with a nanosecond laser, and an electrode for a secondary battery manufactured by the same.