Porous Artificial Graphite Anode for Fast-Charge Electrolyte Infiltration
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Solution Overview
Problem
Existing graphite anode materials for lithium-ion batteries face challenges in achieving high rate charge-discharge performance due to limitations in pore structure and electrolyte infiltration, leading to inefficiencies in lithium ion de-intercalation.
Innovation Solution
The development of an anode material with artificial graphite that includes pores inside and/or on its surface, optimized through a continuous graphitization process to achieve a specific range of oil absorption value, pore volume, and specific surface area (400≤O*V*S≤1500), enhancing lithium ion de-intercalation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional intermittent graphitization process is used, then graphite anode material can be produced, but production period is long (15-50 days) and productivity is low
Solution Approach 1:
The patent employs a continuous graphitization process where precursor material is continuously fed into a graphitization furnace maintained at 2500-3000°C, eliminating the need for repeated heating and cooling cycles. This continuous operation reduces the graphitization period from 15-50 days to a significantly shorter duration, thereby improving productivity and reducing time loss.
2Speed
If pore structure is increased to improve lithium ion diffusion, then rate performance is improved, but specific surface area increases causing degradation of initial efficiency and cycling performance
Solution Approach 1:
The patent utilizes graphite anode material with controlled pore structures formed during continuous graphitization. The pores provide diffusion channels for lithium ions, improving rate performance. The pore structure is optimized to balance diffusion efficiency with maintenance of cycling stability, avoiding excessive specific surface area that would lead to performance degradation.
3Ease of operation
If electrolyte infiltration is insufficient, then pore structure cannot be effectively utilized, but increasing infiltration may cause side reactions
Solution Approach 1:
The patent optimizes parameters including oil absorption value (40-80 mL/100g), pore volume (0.003-0.015 mL/g), and specific surface area (0.5-2.0 m²/g) to achieve optimal electrolyte infiltration. These parameter ranges ensure sufficient electrolyte penetration into pores for effective lithium ion de-intercalation while minimizing side reactions that would occur with excessive infiltration.
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 high rate charge-discharge performance of the anode material by ensuring sufficient electrochemical reaction extent, reducing concentration polarization, and enhancing lithium ion diffusion channels.
Implementation Method 1
the presence of pores can increase diffusion channel of Li+ in the graphite material, and reduce diffusion resistance of Lit
Implementation Method 2
The infiltration capacity of the electrolyte is usually reflected by the oil absorption value
Data Source
AI summary
An anode material and a battery provided. The anode material includes artificial graphite, and there are pores inside and/or on surface of the artificial graphite. The anode material has an oil absorption value of O mL/100 g, a pore volume of V cm3/kg, and a specific surface area of S m2/g, where 400≤O*V*S≤1500. The anode material improves adsorption and infiltration performance of the anode material to electrolyte, and enhance high rate charge-discharge performance of the anode material, without affecting processing performance.