Graphitized Carbon Anode Material for Longer Li-Ion Battery Cycling
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Solution Overview
Problem
The cycle performance of lithium-ion batteries, which is critical for their performance and longevity, is not adequately improved by existing methods focusing on active material enhancements in electrode plates.
Innovation Solution
A negative electrode active material with a carbon material having a degree of graphitization between 0.82 and 0.92 and a controlled aspect ratio distribution, along with specific particle size and interplanar spacing, is used to enhance the electrochemical apparatus's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the degree of graphitization of carbon material is increased to improve cycle performance, then the structural stability improves, but the lithium ion deintercalation efficiency may deteriorate due to overly compact structure
Solution Approach 1:
The patent optimizes the degree of graphitization parameter to a specific range (0.82-0.92) rather than maximizing it, balancing structural stability for cycle performance with sufficient porosity for lithium ion transport. This parameter optimization resolves the contradiction by finding the optimal point rather than extreme values.
2Quantity of substance
If particles with high aspect ratio are increased to improve capacity, then the specific capacity increases, but the electrode density and manufacturing quality deteriorate
Solution Approach 1:
The patent controls the aspect ratio distribution parameter, limiting particles with aspect ratio >3.3 to <10% of total particles. This parameter control ensures sufficient capacity contribution while maintaining good electrode density uniformity and manufacturing quality.
3Quantity of substance
If the proportion of particles with aspect ratio greater than 3.3 is increased to enhance capacity, then the specific capacity improves, but the electrolyte infiltration ability deteriorates
Solution Approach 1:
The patent optimizes the aspect ratio distribution parameter by controlling the proportion of high aspect ratio particles (<10% for aspect ratio >3.3), achieving a balance between capacity enhancement and electrolyte infiltration capability.
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 approach significantly improves the cycle performance and service life of lithium-ion batteries by optimizing the graphitization, aspect ratio, and particle distribution within the negative electrode active material, leading to better electrolyte infiltration and lithium ion deintercalation efficiency.
Implementation Method 1
lithium ion deintercalation efficiency
Implementation Method 2
degree of graphitization Gr of the carbon material that is measured in an X-ray diffraction analysis method
Data Source
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AI summary
This application relates to a negative electrode active material, and an electrochemical apparatus and an electronic apparatus using the same. Specifically, this application provides a negative electrode active material. The negative electrode active material includes a carbon material, where the carbon material has a specific degree of graphitization and aspect ratio distribution. The negative electrode active material in this application helps to improve cycle performance of the electrochemical apparatus.