Laser-Ablated Electrode Edges to Prevent Coating Slide Defects
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Solution Overview
Problem
Conventional electrodes in secondary batteries suffer from sliding phenomena during manufacturing, leading to reduced capacity, reversed N/P balance, and unstable electrode quality due to sliding parts, which degrade performance and lifespan.
Innovation Solution
The electrode design incorporates a cutting surface with concave and convex shapes formed by laser ablation, removing sliding parts and maintaining stable electrode quality by ensuring uniform active material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet coating is performed on the current collector to manufacture the electrode, then the electrode layer can be formed, but sliding parts are generated at both ends leading to reduced capacity and unstable quality
Solution Approach 1:
The patent applies preliminary action by forming a protrusion part on the current collector surface before coating the active material layer. This pre-formed structural feature prevents the sliding phenomenon from occurring during the wet coating process, thereby eliminating sliding parts while maintaining ease of manufacture. The protrusion part is created in advance to control the coating process and ensure uniform active material distribution.
2Productivity
If the sliding part is present in the electrode, then the electrode can be manufactured, but the amount of loading at both ends is reduced leading to lower capacity
Solution Approach 1:
The patent applies local quality by creating a protrusion part at specific locations on the current collector surface. This local structural modification ensures that the active material layer is uniformly distributed in the critical end regions where sliding parts would normally form, while maintaining appropriate loading density in the central region. This resolves the contradiction between overall capacity and local uniformity of active material distribution.
3Reliability
If the sliding part is present in the electrode, then the electrode structure is formed, but physical isolation between positive and negative electrodes occurs due to reversed N/P balance
Solution Approach 1:
The patent applies preliminary action by pre-forming the protrusion part on the current collector before assembling the battery components. This pre-structured current collector ensures proper N/P balance and prevents physical isolation between electrodes during battery operation, thereby improving reliability without adding significant structural complexity. The protrusion part serves as a built-in solution that maintains electrode stability throughout the battery lifecycle.
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 design enhances electrode stability, improves charging and discharging speed, and extends the lifespan of the battery by preventing physical isolation and maintaining optimal N/P balance.
Implementation Method 1
The electrode layer may include a cutting surface having a concave and convex shape
Data Source
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AI summary
Disclosed is an electrode. The electrode may include a current collector and an electrode layer disposed on at least one surface of the current collector. The electrode layer may include a cutting surface having a concave and convex shape.