Negative Electrode Graphite Repair and Regeneration

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Lithium Battery Recycling Solutions

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Email：sales@jfenvirirecycle.com

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.

Product	BRC-01		BYD storage electrolysis pyrolysis acid wash carbon source 2% coating
Test Item		Unit	Enterprise Standard	Test results
Particle size	D10	μm	6.5±2	7.35
	D50	μm	13.0±3.0	13.898
	D90	μm	25±4	23.942
Tap density		g/cm³	≥0.95	1.043
Specific surface area		m²/g	≤2.0	1.45
Containing carbon		%	≥99.5	99.98
ash content		%	≤0.1	0.02
Metallic Element	Fe	ppm	≤30	16
	Cr	ppm	≤6	1.26
	Cu	ppm	≤5	1.24
	Ni	ppm	≤5	1.23
	Al	ppm	≤10	3.42
	Ca	ppm	≤200	56.65
	Zn	ppm	≤15	3.25
	S	ppm	≤50	23.36
	Na	ppm	≤100	36.32
Three-week average discharge specific capacity		mAh/g	≥335	353.3
First-time efficiency		%	≥92.0	93.8

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.

Product	YRC-01a		EVE Energy's electrolytic pyrolysis acid washing carbon source with 2.5% coating
Test Item		Unit	Enterprise Standard	Test results
Particle size	D10	μm	6.5±2	7.12
	D50	μm	13.0±3.0	14.28
	D90	μm	25±4	25.86
Tap density		g/cm³	≥0.95	1.062
Specific surface area		m²/g	≤2.0	1.73
Containing carbon		%	≥99.5	99.97
ash content		%	≤0.1	0.018
Metallic Element	Fe	ppm	≤30	18
	Cr	ppm	≤6	2.14
	Cu	ppm	≤5	1.86
	Ni	ppm	≤5	2.12
	Al	ppm	≤10	4.21
	Ca	ppm	≤200	72.12
	Zn	ppm	≤15	2.76
	S	ppm	≤50	26.63
	Na	ppm	≤100	41.24
Three-week average discharge specific capacity		mAh/g	≥335	353.8
First-time efficiency		%	≥92.0	93.8

FAQ

How does the company ensure environmental protection and safety?

We strictly follow national and international environmental regulations, adopt clean production technologies, and operate a full life-cycle management system. We also host provincial/municipal engineering research centers for lithium battery recycling to ensure both technical and environmental compliance.

What types of waste can your technology equipment process?

Our equipment is designed for comprehensive waste recycling and resource utilization, focusing on spent lithium batteries, cathode/anode materials, graphite waste, and other lithium-ion battery industry by-products, enabling high-value regeneration.

Which well-known companies does Jufeng serve?

We are a partner to over 30 leading companies, including BYD, Ganfeng Lithium, Hithium Energy, CALB, Narada Power, EVE Energy, Changyuan Lico, China Tower, China Recycling Group, and Carbon Neutral Group.

What is the production capacity and project layout?

In Hua County New Energy Carbon Material Industrial Park, we are building a 20,000 t/y anode graphite repair & regeneration and equipment manufacturing project, and a 200,000 t/y anode lithium battery recycling project. We also have a graphite primary processing base in Huizhou (Guangdong) and an R&D & international market center in Shenzhen.

What are the core technologies and R&D capabilities?

Backed by the R&D teams from the Institute of Process Engineering (CAS) and Changsha Mining & Metallurgy Institute, our 16-person core team (including academicians, doctors, and masters) holds nearly 130 patents. Key breakthroughs include cathode LFP regeneration, graphite regeneration, and silicon-carbon new material technologies.

What is the main business of Henan Jufeng Company?

We focus on R&D and production of lithium battery materials, lithium battery recycling and resource utilization, regeneration of cathode & anode materials, manufacturing of waste recycling technology equipment, and processing & sales of lithium battery materials. The company has formed a complete闭环 from spent lithium battery recycling to new lithium material production.

Negative Electrode Sheet Recycling Graphite Regeneration Equipment

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