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Superior Rate Capability of Small Regenerated Graphite Particles Induced by Homogeneously Distributed Current Density
Haoran Da1,2,3, Wenhao Fang1,2, Jiufu Zhu1,2
1CAS Key Laboratory of Green Process and Engineering, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Science, Beijing, 100190, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 24, 2023
Summary
Regenerated spent graphite particles, coated with polypyrrole, enhance fast-charging lithium-ion batteries. This sustainable method improves electrode performance and material reuse.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Spent batteries are a valuable source for electrode materials, necessitating efficient regeneration techniques.
- Small spent graphite particles possess unique structural defects beneficial for high-rate charging and lithiation kinetics.
Purpose of the Study:
- To develop a regeneration technique for spent graphite particles for enhanced performance in fast-charging batteries.
- To investigate the effect of a carbonized polypyrrole coating on the electrochemical properties of recycled graphite.
Main Methods:
- Sieving small spent graphite particles and coating them with carbonized polypyrrole.
- Characterizing the structural and electrochemical properties of the coated graphite.
- Evaluating battery performance, including specific capacity, rate capability, and cycling stability.
Main Results:
- The carbonized polypyrrole coating repaired structural defects and facilitated lithium-ion diffusion.
- The regenerated graphite exhibited superior rate performance, achieving 102.7 mAh g⁻¹ at 4C after 500 cycles.
- Enhanced homogeneity of current density distribution was observed during fast charging.
Conclusions:
- Coating spent graphite particles with carbonized polypyrrole is an effective strategy for high-rate battery applications.
- This regeneration method offers a sustainable approach to utilizing waste materials in energy storage.
- The modified graphite enables efficient lithium-ion transport and improved battery longevity.
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