Dry-Process Electrodes: Two Core Pillars Reshaping Lithium-Ion Battery Competitiveness

In the race of lithium-ion battery (LIB) technology iteration, electrodes—acting as the "core carrier for energy storage and transfer"—directly determine the performance ceiling of batteries and the efficiency of industrial implementation. While traditional wet-process electrodes have supported the large-scale application of LIBs, they are gradually showing limitations amid the dual demands for "green manufacturing" and "high-performance breakthroughs." The rise of dry-process electrodes, however, is redefining the core competitiveness of LIBs from two dimensions: manufacturing innovation and performance upgrading, emerging as a key driver for the industry’s transition from "scale expansion" to "high-quality development."

I. Manufacturing Side: Breaking Wet-Process Bottlenecks to Enable "Cost Reduction and Carbon Emission Reduction" for LIBs

In the traditional wet-process electrode manufacturing workflow, "solvent dependence" is an unavoidable core pain point—from the procurement of organic solvents such as N-methylpyrrolidone (NMP), the energy consumption of slurry mixing, the energy cost of high-temperature drying (120-150°C), to the environmental cost of solvent recovery. Each step pushes up the production threshold and carbon footprint of LIBs. Dry-process electrodes, through their "solvent-free" technology, directly break this dilemma at the source of manufacturing, providing a solution for the sustainable development of the LIB industry.

On one hand, dry-process electrodes significantly simplify the production process by eliminating three high-cost links: "solvent mixing, high-temperature drying, and solvent recovery." Data shows that in the wet process, the drying stage accounts for over 30% of the total energy consumption in battery production. Producing 1 GWh of LIBs requires more than 500 tons of organic solvents, and the investment in solvent recovery equipment accounts for 15%-20% of the total cost of the production line. In contrast, dry-process electrodes only need to mix active materials, conductive agents, and dry binders into powder via high-speed shearing, then directly laminate the powder onto current collectors through precision calendering. This reduces equipment investment by 20%, shortens the production cycle by 40%, and cuts the production cost of 1 GWh of LIBs by 15%-20%. For cost-sensitive scenarios such as energy storage stations and new energy commercial vehicles, this "cost reduction effect" is directly translated into market competitiveness of products. For example, the unit cost of 280Ah lithium iron phosphate batteries can be reduced from 0.6 CNY/Wh to below 0.5 CNY/Wh after dry-process manufacturing, lowering the cost per kilowatt-hour by 8% and accelerating the transition of energy storage from "policy-driven" to "market-driven."

On the other hand, dry-process electrodes completely address the environmental pain points of the wet process. In wet production, solvent volatilization not only generates volatile organic compound (VOC) pollution but also produces waste liquid during recovery, resulting in high treatment costs. The dry process, however, involves no solvents throughout the entire process, achieving "zero pollution and zero waste liquid" production and perfectly aligning with the "dual carbon" goals. Taking a 10 GWh annual output dry-process electrode production line of a battery enterprise as an example, compared with the wet process, it can reduce organic solvent consumption by more than 5,000 tons per year and cut carbon emissions by approximately 12,000 tons—equivalent to the carbon sequestration of 67,000 trees. As environmental policies become increasingly stringent, dry-process electrodes have become a key choice for enterprises to avoid "environmental compliance risks" and build green supply chains.

II. Performance Side: Restructuring Electrode Microstructure to Unlock LIBs’ Potential for "High Power and Long Lifespan"

If the advantages on the manufacturing side lay the "foundation for implementation" of dry-process electrodes, their breakthroughs on the performance side make them the "core engine" for LIB upgrading. In the wet process, solvent volatilization during drying easily causes collapse of internal micropores in electrodes and uneven distribution of binders, creating an "ion transport bottleneck." Dry-process electrodes, however, construct a more optimized microstructure through precisely controlled calendering and solvent-free characteristics, directly enhancing the core performance indicators of LIBs.

First, dry-process electrodes significantly improve the fast-charging capability and power density of LIBs. Electrodes manufactured via the dry process have more uniform distribution of active material particles and form a "3D network porous structure" inside, with porosity accurately adjustable to 30%-60% (wet-process electrodes typically have porosity below 40% due to micropore collapse). This provides smoother channels for lithium-ion migration. Test data shows that lithium iron phosphate batteries using dry-process electrodes have a lithium-ion migration rate more than 3 times higher than that of wet-process counterparts, enabling fast charging to 80% capacity in 10 minutes at room temperature. This means the charging time of new energy heavy-duty trucks and buses can be reduced from over 1 hour to less than 15 minutes, approaching the refueling efficiency of fuel vehicles. Meanwhile, higher power density makes dry-process electrode LIBs outstanding in "frequency and peak regulation" scenarios of energy storage stations, where they can quickly respond to grid power fluctuations and improve grid stability.

Second, dry-process electrodes greatly extend the cycle life and safety of LIBs. Residual solvents in wet-process electrodes tend to decompose and generate gas during long-term charge-discharge cycles, leading to battery swelling and increased internal resistance. Typically, the capacity retention rate of wet-process LIBs is only about 80% after 1,000 cycles. In contrast, dry-process electrodes have no solvent residues, and the active materials form a tight bond with current collectors through calendering, resulting in stronger structural stability. Their capacity retention rate can still reach 90% after 1,500 cycles. In terms of safety, dry-process electrodes also show obvious advantages in thermal stability: in needle penetration and extrusion tests, the maximum temperature of dry-process LIBs is 40°C lower than that of wet-process ones, with no fire or explosion—providing critical support for scenarios with high safety requirements such as home energy storage and energy storage stations.

From "cost reduction and carbon emission reduction" on the manufacturing side to "quality and efficiency improvement" on the performance side, dry-process electrodes are not just a technological upgrade of LIB processes, but also a crucial starting point for promoting the new energy industry’s transition from "competing for scale" to "competing for technology." As dry-process technology continues to make breakthroughs in material compatibility (e.g., adapting to high-nickel cathodes and silicon-based anodes) and large-scale consistency, it will gradually replace wet-process electrodes to become the mainstream technical route in the LIB industry, injecting strong momentum into the high-quality development of new energy vehicles, energy storage, smart grids, and other fields.