Product Introduction

Jufeng Company, in collaboration with the Institute of Process Engineering, Chinese Academy of Sciences, has jointly developed a repair and regeneration technology for negative electrode sheets sourced from production scrap and batteries removed before electrolyte filling (unformed batteries). This technology achieves regeneration through a four-step process: anaerobic pyrolysis -> secondary graphite, acid washing purification -> primary graphite, carbon coating -> regenerated graphite, and microwave repair -> high-performance graphite. The performance of the graphite repaired and regenerated via this technology is close to, or even surpasses, that of virgin graphite.

• 1. Anaerobic Pyrolysis: Organic materials are thermally decomposed via pyrolysis. Flexible, non-mechanical force stripping yields secondary graphite. The pyrolysis process preserves the integrity of the original graphite layer structure framework, its conductivity, and electrochemical activity, while simultaneously increasing the purity of the graphite powder.
• 2. Acid Washing Purification: Trace impurities in the pyrolyzed secondary graphite powder are removed via acid treatment, elevating the graphite purity to ≥99.95%. This meets the requirements for battery-grade primary graphite characterized by high conductivity, high activity, and high cyclability.
• 3. High-Temperature Carbon Coating: A proportional amount of organic carbon source is added for high-temperature carbon coating. This induces secondary graphitization, repairing surface defects and lattice distortions in the primary graphite. It fills cracks and pores, reduces and optimizes the specific surface area of the graphite, and increases its tap density. The result is high-performance regenerated graphite with improved specific capacity, first-cycle efficiency, cycle life, and rate capability.
• 4. Microwave Repair: Although carbon is a non-polar molecule, it is a strong microwave absorption medium. Microwave high-temperature treatment further repairs and reshapes the regenerated graphite's lattice structure, micro-cracks, layered graphitization, etc. This increases the degree of graphitization, reduces specific surface area, and boosts tap density, yielding graphite with even higher performance metrics in specific capacity, first-cycle efficiency, cycle life, and rate capability. The performance of microwave-repaired graphite is close to, or even exceeds, the specifications of virgin graphite.

Partial Performance Specifications of Regenerated Graphite Products

1. BYD Artificial Graphite Repair and Regeneration - BRC-01a

BYD's unformed battery negative electrode sheets undergo a process of pyrolysis, acid washing, carbon coating, and microwave repair to produce regenerated artificial graphite. The performance of this regenerated graphite is close to, or even surpasses, the specifications of virgin graphite. It can be used in the manufacturing of prismatic, pouch, cylindrical, blade, and coin-type lithium batteries.

This product is suitable for applications across various industries including energy storage, power tools, 3C digital electronics, low-speed electric vehicles, logistics vehicles, electric forklifts, electric two- and three-wheelers, commercial & industrial backup power, shared battery swapping, electric toys, high-energy-consumption toys, outdoor equipment, consumer batteries, and more.

2. EVE Lithium Energy Artificial Graphite Repair and Regeneration - YRC-01a

EVE's waste unformed battery negative electrode sheets undergo pyrolysis, acid washing, and coating to produce regenerated graphite. This material can be used to manufacture various battery types, including prismatic, pouch, and cylindrical cells. It finds applications in industries such as energy storage, low-speed electric vehicles, electric two- and three-wheelers, commercial & industrial backup power, shared battery swapping, and consumer batteries.

Special Note: Our company can adjust the proportion of organic carbon source used in the carbon coating regeneration and repair process based on specific customer requirements for graphite performance. Furthermore, the regenerated graphite can be blended with virgin graphite in specific ratios to achieve the desired final graphite specifications.