Artificial Graphite Surface Roughness for Longer-Life Battery Anodes
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Solution Overview
Problem
Existing artificial graphite materials for secondary batteries fail to achieve high energy density and long service life, leading to suboptimal performance in terms of energy storage and durability.
Innovation Solution
Development of artificial graphite materials with specific surface roughness, true density, median particle size, and graphitization degree, along with a preparation method involving crushing, shaping, granulation, graphitization treatment, and surface roughening, to enhance binding forces and acting forces between graphite particles and binders, thereby increasing energy density and prolonging service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing artificial graphite materials are used, then manufacturing simplicity is maintained, but energy density and service life requirements cannot be satisfied
Solution Approach 1:
The preparation process is divided into distinct sequential steps: crushing, shaping, granulation, graphitization treatment, and surface roughening. Each step transforms the material to specific parameters, allowing precise control over the final graphite properties to achieve both high reliability and controlled complexity
Solution Approach 2:
The invention systematically controls multiple parameters including surface roughness (6≤η≤12), true density (ρ≥2.20 g/cm³), median particle size (Dv50≥10 μm), specific surface area (1.5-4.0 m²/g), and graphitization degree (>92%). By optimizing these parameters through the multi-step process, the graphite achieves enhanced service life and performance
2Use of energy by moving object
If surface roughness is increased to enhance binding forces, then energy density improves, but manufacturing complexity increases
Solution Approach 1:
The surface roughening treatment is performed as a preliminary step before graphitization, preparing the surface morphology in advance. This preliminary action ensures that when graphitization occurs, the rough surface structure is already established, facilitating better binding forces and higher energy density without requiring complex post-processing
Solution Approach 2:
Surface roughness is controlled within the specific range of 6≤η≤12 through the surface roughening treatment. This parameter optimization enhances the binding forces between graphite particles and binders, directly improving energy density while maintaining manufacturing feasibility through controlled process parameters
3Duration of action of stationary object
If particle size is increased to reduce specific surface area, then service life improves, but energy density may be compromised
Solution Approach 1:
The invention optimizes the median particle size to Dv50≥10 μm while controlling the specific surface area to 1.5-4.0 m²/g. This parameter combination achieves the right balance: larger particles reduce the specific surface area and improve service life, while the controlled surface roughness and graphitization degree ensure sufficient energy density is maintained
4Stability of the object's composition
If graphitization degree is increased to improve structural stability, then service life extends, but manufacturing complexity and cost increase
Solution Approach 1:
The graphitization degree is controlled to be greater than 92% through optimized graphitization treatment parameters including temperature, time, and atmosphere. This parameter optimization achieves high structural stability and service life while avoiding excessive complexity by establishing clear process boundaries and control points
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 optimized artificial graphite materials result in higher energy density and extended service life for secondary batteries, improving safety performance and reducing bounce during cold pressing, while maintaining structural stability and suppressing side reactions.
Implementation Method 1
enhance binding forces and acting forces between graphite particles and binders
Implementation Method 2
enhance binding forces and acting forces between graphite particles and binders
Data Source
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AI summary
This application provides an artificial graphite material A. The artificial graphite material A is secondary particles, where a surface roughness ηA of the artificial graphite material A satisfies 6≤ηA≤12. This application further provides an artificial graphite material B. The artificial graphite material B is primary particles, where a surface roughness ηB of the artificial graphite material B satisfies 2.5≤ηB≤5. This application further provides a secondary battery containing the artificial graphite material A and/or the artificial graphite material B and an electric apparatus. The secondary battery provided by this application can have high energy density and long service life.