Anode Active Material for Lithium Secondary Battery
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Solution Overview
Problem
Lithium secondary batteries require anode active materials with improved initial efficiency and charge/discharge characteristics for high-power applications in low voltage systems, which existing materials fail to consistently deliver.
Innovation Solution
An anode active material composed of two kinds of crystalline carbon, specifically natural and artificial graphite, with a peak intensity ratio of 3R(101) to 2H(100) in the X-ray diffraction pattern ranging from 0.55 to 0.7, and a weight mixing ratio of 20:80 to 40:60, enhancing charge and discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional anode materials are used, then manufacturing simplicity is maintained, but charge and discharge characteristics and initial efficiency are insufficient for high-power applications
Solution Approach 1:
The patent employs a composite anode material consisting of natural graphite and artificial graphite in a specific weight ratio range (60:40 to 80:20). This composite structure combines the advantages of both graphite types: natural graphite provides excellent charge characteristics and initial efficiency, while artificial graphite contributes to good discharge characteristics and structural stability. The specific composition ratio optimizes the balance between charge and discharge performance, enabling high-power applications in low voltage systems.
2Reliability
If single-type graphite is used, then material simplicity is maintained, but initial efficiency and charge/discharge balance cannot be optimized
Solution Approach 1:
The patent optimizes the weight ratio parameter of natural graphite to artificial graphite within the range of 60:40 to 80:20. This parameter optimization achieves the best balance between initial efficiency (enhanced by natural graphite) and charge/discharge characteristics (improved by artificial graphite). The specific ratio range was determined through systematic variation to maximize overall battery performance.
3Power
If high-power characteristics are pursued, then charge rate is improved, but low-temperature resistance deteriorates
Solution Approach 1:
The composite structure of natural and artificial graphite in optimized ratios improves ionic conductivity and charge rate characteristics, enabling high-power performance. Simultaneously, the natural graphite component with its specific crystal structure reduces low-temperature resistance by facilitating smoother lithium ion insertion and extraction at lower temperatures, thus resolving the trade-off between high-power characteristics and low-temperature performance.
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 proposed anode active material exhibits improved initial efficiency, charge, and discharge characteristics, specifically in low voltage systems, by optimizing the interlayer spacing and peak intensity ratio, leading to enhanced battery performance and reduced low-temperature resistance.
Implementation Method 1
having a ratio (I3R(101)/I2H(100)) of peak intensity at a 3R(101) face relative to a peak intensity at a 2H(100) face ranging from 0.55 to 0.7, in an X-ray diffraction pattern
Data Source
AI summary
The present invention relates to an anode active material for lithium secondary battery and a lithium secondary battery comprising the same. The anode active material for lithium secondary batteries comprises two kinds of crystalline carbon, with the peak intensity ratio of 3R(101) face to 2H(100) face I3R(101)/I2H(100) ranging from 0.55 to 0.7 in an X-ray diffraction pattern.