New Standards for Green Manufacturing: Dry Electrodes Gradually Replace High-Pollution Traditional Wet Electrodes

With the continuous tightening of low-carbon production and green manufacturing policies in the new energy industry, energy consumption control and environmental emission standards for battery and supercapacitor manufacturing have been continuously upgraded. Traditional high-pollution and high-energy-consumption processes are being phased out at an accelerated pace. As a core procedure of cell production, the traditional wet coating process highly relies on NMP organic solvents, resulting in long-term industry pain points such as VOCs emissions, high production energy consumption, large hazardous waste output, and serious material loss. It can no longer meet the green factory and low-carbon mass production standards of the new era. Relying on the core advantages of zero solvent, low energy consumption, high material utilization rate, and low operational pollution, the solvent-free dry electrode process has become a mainstream technical solution to replace traditional wet processes and implement new green manufacturing standards, promoting the comprehensive upgrading of new energy electrode production from the traditional “end-of-pipe treatment” model to a “source zero-pollution” green production system.

1. Deficiencies of Traditional Wet Electrodes: High Pollution and High Energy Consumption

Traditional wet electrode production adopts NMP (N-Methylpyrrolidone) as the core organic solvent, completing electrode forming through slurry stirring, wet coating, high-temperature drying, and solvent recovery rectification. This process has inherent environmental and energy consumption defects, serving as the main source of pollution and energy consumption in new energy factories.

1. Toxic solvent volatilization and high environmental compliance pressure: NMP used in wet processes is a volatile toxic organic solvent that continuously generates VOCs exhaust gas during mass production. Even with professional recovery and treatment equipment, 5%–10% trace emissions may still escape during production, easily causing substandard workshop air quality. Meanwhile, the production process produces hazardous wastes such as waste slurry and residual solvents, which bring high subsequent treatment costs and strict supervision, failing to meet the green production access standards of high-end new energy factories.

2. High production energy consumption and large carbon emission base: The wet process requires essential energy-intensive procedures including long-distance high-temperature drying, solvent condensation recovery, and rectification purification. Drying and solvent recovery alone account for approximately 46% of the total energy consumption of the electrode production line. Featuring lengthy production lines, numerous devices, and continuous heating operation, the overall production energy consumption and carbon emissions remain high, which is inconsistent with the industry trend of energy conservation, carbon reduction, and low-cost mass production.

3. High material loss and low resource utilization rate: Wet slurry is prone to residue, overflow, and edge waste during preparation, coating and transportation, with a comprehensive production loss rate of up to 5%. Restricted by the characteristics of liquid-phase processes, the effective utilization rate of active materials is less than 97%. This not only causes raw material waste, but also indirectly increases production energy consumption and pollutant output, conflicting with the concept of circular manufacturing.

4. Complicated operation and maintenance with potential environmental risks: Wet production lines require long-term supporting of complete environmental protection equipment such as exhaust gas treatment, solvent recovery, and waste liquid management, leading to cumbersome operation and maintenance procedures, high fixed asset investment and maintenance costs. Equipment aging and non-standard operation and maintenance may easily cause hidden environmental problems including excessive exhaust emissions and waste liquid leakage, directly affecting factory green rating, production capacity expansion and bidding qualifications.

2. Core Advantages of Dry Electrode Processes for New Green Manufacturing Standards

The solvent-free dry electrode process completely renovates the traditional liquid-phase production mode. Without adding any organic solvents throughout the process, electrodes are fabricated through purely physical methods including precise powder proportioning, uniform dry mixing, PTFE fibrillation bridging, and constant-temperature hot-press forming. It eliminates pollutant generation at the source and fully complies with the new industry standards for green production, low-carbon consumption and high-efficiency mass production.

1. Zero source pollution and VOCs-free production: Requiring no organic solvents such as NMP, the dry process achieves zero solvent volatilization, zero VOCs exhaust gas and zero solvent hazardous waste output throughout production, realizing truly pollution-free and emission-free electrode manufacturing. There is no need to build complex solvent recovery and exhaust gas treatment systems, avoiding environmental compliance risks fundamentally and easily adapting to strict green production and emission control standards in various regions.

2. Significant energy saving and carbon emission reduction: The dry process directly eliminates high-energy-consuming links such as high-temperature drying and solvent recovery rectification, reducing the overall production line length by more than 70%. Under the same production capacity, the comprehensive energy consumption of a single electrode production line is reduced by 38%–46%, effectively lowering factory power load and production carbon emissions. It helps enterprises complete dual-carbon assessment indicators and obtain certifications such as Green Factory and Green Supply Chain.

3. High material utilization and reduced resource waste: With no slurry residue or liquid-phase loss, the dry process achieves an active material loading rate of over 99% and greatly improves material utilization, thoroughly solving the material waste problem of wet processes. In addition, waste materials generated from dry production can be directly recycled and reused, forming a closed-loop production resource cycle and conforming to the concept of green circular manufacturing.

4. Simplified operation and maintenance with lower environmental governance costs: Eliminating the need for supporting environmental equipment including solvent treatment, exhaust gas purification and waste liquid disposal, the process greatly reduces fixed asset investment, daily operation and maintenance, and environmental governance costs. It fundamentally avoids various compliance risks caused by end-of-pipe pollution treatment, builds a streamlined production and management system, and adapts to large-scale and standardized green mass production needs of enterprises.

3. Industry Replacement Trend: Dry Process as a Must for Green Manufacturing Upgrading

As the new energy industry’s green manufacturing system continues to improve, source pollution reduction, energy conservation and low-carbon compliance have become mandatory assessment indicators for manufacturers of lithium batteries, supercapacitors and solid-state batteries. The inherent disadvantages of wet processes — high pollution, high energy consumption and complicated maintenance — have become core constraints for enterprises in green rating, capacity expansion and market bidding, making process upgrading and replacement extremely urgent.

From the perspective of industrial iteration, the replacement of wet electrodes by dry electrodes is not only a single-process upgrade, but also a subversive transformation of new energy manufacturing mode from “end-of-pipe treatment” to “source green manufacturing”. Driven by policy supervision, cost reduction and high-end market demand, the replacement pace of high-pollution wet processes continues to accelerate. With all-round advantages in environmental protection, energy saving, high efficiency and cost reduction, the solvent-free dry process has become an essential solution for industrial green manufacturing upgrading, widely applied in high-end new energy fields such as lithium batteries, supercapacitors and solid-state batteries.

4. Conclusion

The core logic of green manufacturing lies in source pollution reduction, full-process energy conservation, efficient circulation and compliant mass production. Restricted by the liquid-phase solvent system, traditional wet electrodes cannot fundamentally solve the problems of pollution, high energy consumption and material loss, failing to match the new-era green manufacturing standards for new energy. Through underlying process innovation, the solvent-free dry electrode process builds a green production system featuring zero VOCs emissions, low energy consumption, high material utilization and low operational risks. It not only meets strict environmental compliance requirements and reduces comprehensive production costs, but also improves cell batch consistency and stability. It empowers enterprises to build a low-carbon, standardized and sustainable green intelligent manufacturing system, serving as the mainstream upgrading direction for new energy electrode mass production in the future.