Lithium Battery Electrode Plasma Surface Roughness
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining cycle-life characteristics due to limitations in electrode surface roughness and energy density, which affects their performance in high-tech, portable electronic devices.
Innovation Solution
The development of an electrode with a surface roughness of 800 nm to 1000 nm, achieved through atmospheric plasma treatment, incorporating an oxygen atom-containing functional group, such as a ketone or ester group, and a fluorine-substituted carbonate-based solvent, enhances the electrode's interaction with the electrolyte and improves cycle-life characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode surface roughness is increased to improve cycle-life characteristics, then the battery durability is improved, but the manufacturing precision and surface uniformity deteriorate
Solution Approach 1:
The patent applies parameter changes by treating the electrode surface with plasma under specific conditions (power: 100-500W, gas flow rate: 10-50 sccm, treatment time: 1-10 minutes) to achieve a controlled surface roughness of 800-1000 nm. This transforms the surface morphology parameters to improve cycle-life characteristics while maintaining manufacturability through precise control of treatment parameters.
Solution Approach 2:
The patent replaces mechanical surface treatment methods with plasma treatment. Instead of using mechanical abrasion or coating techniques to modify surface roughness, the invention uses plasma physics (ionization, excitation, and chemical reactions in the plasma state) to achieve the desired surface morphology and functional groups, thereby improving cycle-life characteristics without compromising manufacturing precision.
2Reliability
If atmospheric plasma treatment is applied to modify surface roughness and add functional groups, then the electrode's interaction with electrolyte is enhanced, but the device complexity and processing steps increase
Solution Approach 1:
The patent merges multiple functions into a single plasma treatment step. The plasma treatment simultaneously achieves surface roughness modification (800-1000 nm), introduces oxygen-containing functional groups (ketone or ester groups), and enhances electrolyte interaction. This consolidation improves reliability while minimizing the increase in device complexity by combining what would otherwise be separate processing steps.
Solution Approach 2:
The patent uses parameter changes in the plasma treatment process (power: 100-500W, gas flow rate: 10-50 sccm, treatment time: 1-10 minutes) to achieve multiple objectives simultaneously. By optimizing these parameters, the treatment produces the desired surface roughness and functional groups in a single step, enhancing electrode-electrolyte interaction without proportionally increasing processing complexity.
3Reliability
If the surface roughness is optimized to 800 nm to 1000 nm, then the surface energy and contact angle are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces mechanical surface finishing methods with plasma treatment to achieve the specific surface roughness range of 800-1000 nm. The plasma process provides better control over surface morphology through adjustable parameters (power, gas flow rate, treatment time), enabling precise achievement of the target roughness while simultaneously improving surface energy and contact angle without excessively stringent manufacturing precision requirements.
Solution Approach 2:
The patent employs parameter changes in the plasma treatment process to precisely control surface roughness within the 800-1000 nm range. By adjusting power (100-500W), gas flow rate (10-50 sccm), and treatment time (1-10 minutes), the process achieves the optimal surface characteristics (roughness, surface energy, contact angle) with controllable manufacturing precision rather than requiring extremely tight tolerances.
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 modified electrode significantly improves the cycle-life characteristics of lithium secondary batteries by optimizing surface energy and contact angles, leading to better impregnation and stability, thus enhancing the battery's performance and energy density.
Implementation Method 1
radiating atmospheric plasma on a surface of the active material layer of the electrode, and then, surface-modifying the surface of the active material layer
Implementation Method 2
surface-modifying the surface of the active material layer to have a surface roughness ranging from about 800 nm to about 1000 nm
Implementation Method 3
The surface of the electrode may have a surface energy of about 45 mN/cm to about 60 mN/cm. The surface of the electrode may have a surface having a contact angle of about 60 degrees to about 80 degrees with respect to water.
Data Source
AI summary
An electrode for a lithium secondary battery, including a surface having surface roughness of about 800 nm to about 1000 nm, and a lithium secondary battery including the same. In one embodiment, the lithium secondary battery has improved cycle-life characteristics.