Artificial Graphite Anode Pore Structure for Li-Ion Rate and Capacity
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Solution Overview
Problem
Current graphite anode materials for lithium-ion batteries face challenges in achieving optimal rate performance and capacity due to limitations in pore structures and processing methods, which are not adequately addressed by improving single parameters.
Innovation Solution
The development of an anode material with artificial graphite that incorporates specific pore structures, a controlled pore volume, specific surface area, and tap density, optimized through a continuous graphitization process to enhance lithium ion diffusion and electrochemical reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pore volume is increased to improve lithium ion diffusion, then rate performance is improved, but specific surface area and tap density become unbalanced, reducing overall electrochemical performance
Solution Approach 1:
The patent applies parameter changes by establishing a specific quantitative relationship between pore volume (V), specific surface area (S), and tap density (T) through the formula 8.5≤V*S/T≤27. This parameter optimization resolves the contradiction by providing a balanced pore structure that ensures sufficient lithium ion diffusion channels while maintaining appropriate specific surface area and tap density for optimal electrochemical performance
Solution Approach 2:
The patent utilizes porous materials by introducing controlled pore structures into the artificial graphite anode material. The pores serve as lithium ion diffusion channels, and the patent optimizes their volume, distribution, and characteristics to improve rate performance while maintaining structural balance among V, S, and T parameters
2Productivity
If continuous graphitization process is used to reduce production time, then productivity is improved, but control over pore volume, specific surface area, and tap density becomes more challenging
Solution Approach 1:
The patent applies feedback control by establishing a quantitative relationship (8.5≤V*S/T≤27) that guides the continuous graphitization process. By monitoring and adjusting pore volume, specific surface area, and tap density parameters during production, the process maintains precise control over pore structure characteristics while achieving continuous operation and high productivity
Solution Approach 2:
The patent implements continuity of useful action through a continuous graphitization process that operates without interruption. This continuous operation improves productivity while the established parameter relationship ensures consistent control over pore structure properties throughout the production process
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 anode material exhibits improved rate performance and capacity, with a balanced pore structure and processing performance that ensures efficient lithium ion de-intercalation and electrochemical performance.
Implementation Method 1
The pore volume within a certain range can increase diffusion channels of lithium ions, and reduce diffusion resistance of lithium ions
Implementation Method 2
The specific surface area within a certain range can ensure a sufficient electrochemical reaction interface, and promote the diffusion of lithium ions in a solid-liquid interface and a solid phase
Data Source
AI summary
The present disclosure provides an anode material and a battery, and the anode material comprises artificial graphite. An interior and/or a surface of the artificial graphite has pores, and the anode material has a pore volume of V cm3/kg, a specific surface area of S m2/g, and a tap density of T g/mL, where 8.5≤V*S/T≤27. The anode material and the battery provided by the present disclosure can improve electrochemical performance of the anode material while ensuring processing performance of the material.