Artificial Graphite Surface Roughness for Long-Life Battery Anodes
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Solution Overview
Problem
Existing artificial graphite materials used in secondary batteries fail to achieve high energy density and long service life, limiting their performance and safety.
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 structural stability, resulting in improved energy density and prolonged 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 segmented into distinct sequential steps: crushing and shaping, granulation, graphitization treatment, and surface roughening treatment. Each step optimizes specific parameters independently, allowing complex requirements to be met through modular process control rather than requiring a monolithic complex system.
Solution Approach 2:
The invention controls multiple parameters across different processing stages: particle size distribution during crushing, granulation conditions, graphitization temperature and duration, and surface roughening parameters. By systematically adjusting these parameters at each stage, high service life and energy density are achieved through cumulative parameter optimization rather than single-step complexity.
2Reliability
If artificial graphite with high energy density is used, then battery energy density increases, but service life is compromised
Solution Approach 1:
The invention creates local quality differences within the graphite particles by controlling surface roughness specifically (6≤η≤12) while maintaining internal graphitization degree (90%≥γ≥80%). This local differentiation allows the surface to provide enhanced binding and stability for long service life, while the interior maintains high energy density characteristics, resolving the contradiction between these two properties.
Solution Approach 2:
The artificial graphite is constructed as a composite structure combining particles with specific surface roughness characteristics and internal graphitization degrees. This composite approach integrates materials with different properties (rougher surfaces for stability, highly graphitized interiors for energy density) into a single functional material that simultaneously achieves both long service life and high energy density.
3Reliability
If surface roughness is increased to enhance binding force, then service life improves, but manufacturing complexity increases
Solution Approach 1:
The surface roughening treatment is performed as a preliminary action before electrode assembly, creating the desired surface roughness (6≤η≤12) in advance. This preliminary surface preparation enhances binding forces and reduces bounce during subsequent cold pressing, improving service life without requiring complex adjustments during final assembly. The roughening is achieved through conventional equipment (fusion machine or granulation kettle) operated under controlled conditions.
Solution Approach 2:
Instead of using complex mechanical systems to control particle morphology, the invention employs thermal-chemical processes (graphitization treatment at high temperature followed by controlled surface roughening) to achieve the desired surface properties. This substitution of mechanical complexity with thermal/chemical processes simplifies manufacturing while achieving superior surface characteristics for enhanced service life.
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 increase energy density and extend the service life of secondary batteries, enhancing safety performance and stability, while maintaining high gram capacity and suppressing side reactions.
Implementation Method 1
a graphitization degree of the artificial graphite material A is greater than 92%
Implementation Method 2
a gram capacity of the artificial graphite material A is greater than 340 mAh/g
Implementation Method 3
performing surface roughening treatment to obtain the artificial graphite material A; a surface roughness ηA of the artificial graphite material A satisfies 6≤ηA≤12
Implementation Method 4
suppressing side reactions
Data Source
AI summary
An artificial graphite material A. The artificial graphite material A is secondary particles are provided. In some embodiments, 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.