Battery Electrode Edge Profile for Uniform Coating Thickness
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Solution Overview
Problem
The existing electrodes in lithium secondary batteries suffer from a sliding phenomenon during the coating process, leading to uneven thickness distribution and capacity imbalance between positive and negative electrodes, which affects battery performance and stability.
Innovation Solution
The electrode design includes a central portion with a slope of 80-90° at the end portion, and the sliding portion is removed using laser ablation, ensuring uniform thickness and adhesion with the separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active material slurry is coated on current collector using conventional methods, then coating process is simple and fast, but sliding phenomenon occurs causing uneven thickness distribution and capacity imbalance
Solution Approach 1:
The patent applies preliminary action by designing a coating method that pre-compensates for the sliding phenomenon. The coating process is optimized to account for expected slurry spread, ensuring uniform thickness distribution before the sliding occurs, thereby preventing capacity imbalance between electrodes
Solution Approach 2:
The patent employs parameter changes by optimizing coating parameters such as slurry viscosity, coating speed, and drying conditions. These parameter adjustments control the sliding behavior of the slurry, transforming the harmful sliding phenomenon into a controlled process that achieves uniform thickness distribution
2Reliability
If sliding portion is present at electrode end, then coating process is easier, but capacity balance between positive and negative electrodes is reversed
Solution Approach 1:
The patent applies the extraction principle by removing the sliding portion from the electrode structure. By eliminating the harmful sliding portion at the electrode end, the capacity balance between positive and negative electrodes is maintained, preventing reversal while still allowing a simplified coating process
3Stability of the object's composition
If sliding portion exists at electrode end, then coating is simpler, but physical gap is generated and electrode quality stability deteriorates
Solution Approach 1:
The patent removes the sliding portion after coating to prevent physical gap formation and maintain electrode quality stability. This post-coating removal approach ensures that the electrode structure is optimized before assembly, eliminating quality instability issues
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 prevents capacity imbalance, reduces lithium deposition, and improves cycle characteristics and adhesion, enhancing the overall performance of the secondary battery.
Implementation Method 1
the sliding portion is removed using laser ablation
Data Source
AI summary
Disclosed are an electrode and a method for manufacturing the same. The electrode includes: a current collector; and an electrode layer disposed on at least one surface of the current collector and a non-coated portion having no electrode layer, wherein the vertical section of the electrode layer is provided with a central portion of the electrode layer, and an end portion that is extended from each of both sides of the central portion of the electrode layer and is in contact with the current collector, while the height of the central portion of the electrode layer decreases, the electrode layer shows a slope of the end portion of 80-90°, and the slope of the end portion refers to an angle formed by a boundary point at which the end portion of the electrode layer contacts the current collector, between the tangent line in contact with the end portion and one surface of the current collector facing the electrode layer.