Carbonaceous Negative Electrode Layer for Li-Ion Intercalation
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Solution Overview
Problem
Existing negative electrode active materials in lithium ion batteries face challenges in achieving optimal resistance and lithium ion intercalation, particularly in terms of orientation and D/G ratio, which affect battery performance.
Innovation Solution
A negative electrode active material layer with a carbonaceous material having an orientation I004/I110 ratio of 1.00 to 2.00 and a D/G mode value of 0.50 to 0.80, along with a half-width of 0.30 to 0.60, and a density of 1.2 to 1.6 g/cc, optimized for improved resistance and lithium ion diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orientation I004/I110 is increased to improve lithium ion diffusion, then the resistance decreases, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent applies parameter changes by optimizing the orientation ratio I004/I110 to a specific range (1.00-2.00) and the D/G mode value to (0.50-0.80) with half-width (0.30-0.60). These parameter specifications transform the manufacturing process from qualitative control to quantitative control, enabling precise manipulation of crystallite orientation and carbon structure quality to achieve optimal resistance while maintaining manufacturability.
2Productivity
If the D/G mode value is optimized to improve intercalation efficiency, then the battery performance improves, but the measurement precision requirements increase
Solution Approach 1:
The patent utilizes Raman mapping measurement to quantify the D/G ratio parameters (mode value and half-width) of the carbonaceous material. By specifying the mode value range (0.50-0.80) and half-width range (0.30-0.60), the patent transforms the complex intercalation efficiency optimization into measurable parameter control, enabling precise adjustment of carbon structure quality to enhance lithium ion intercalation while providing clear measurement criteria.
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 solution enhances the resistance and lithium ion intercalation efficiency, resulting in improved battery performance by aligning the carbonaceous material's structure with lithium ion diffusion directions and providing optimal intercalation sites.
Implementation Method 1
the negative electrode active material layer has an orientation I004/I110 of 1.00 or more and 2.00 or less as measured by X-ray diffractometry
Implementation Method 2
in the frequency distribution of D/G of the carbonaceous negative electrode active material, which is the ratio of the peak intensity of the D band to the peak intensity of the G band, obtained by Raman mapping measurement
Implementation Method 3
D50 particle size of the carbonaceous negative polarity active material measured by laser diffraction method
Data Source
AI summary
The negative electrode active material layer of the present disclosure comprises a carbonaceous negative electrode active material,wherein the negative electrode active material layer has an orientation I004/I110 of 1.00 or more and 2.00 or less as measured by X-ray diffractometry, andwherein in the frequency distribution of D/G of the carbonaceous negative electrode active material, which is the ratio of the peak intensity of the D-band to the peak intensity of the G-band obtained by Raman mapping measurement, the mode value is 0.5 or more and 0.8 or less, and the half width of the peak having the mode value is 0.3 or more and 0.6 or less.