Cross-Border Empowerment of Lithium-Ion Battery Dry Process Technology: Unlocking New Space for Supercapacitor Performance and Industrialization

Supercapacitors, with their advantages of fast charging/discharging and long cycle life, occupy an important position in fields such as rail transit and industrial energy storage. However, traditional wet preparation processes have long restricted their performance breakthroughs and cost control. The mature dry process technology from the lithium-ion battery sector, featuring core characteristics of "solvent-free and controllable structure," has brought cross-border innovation to supercapacitors—from electrode preparation to system integration, lithium-ion battery dry process technology is addressing the pain points of supercapacitors, such as low energy density, high internal resistance, and difficulty in mass production, driving them from "niche energy storage devices" to "key players in large-scale applications."

I. Restructuring Electrode Structure: Dry Process Technology Addressing Supercapacitor Performance Bottlenecks

The core performance of supercapacitors depends on the pore structure and conductive network of electrodes. During the preparation of electrodes using traditional wet processes, solvent evaporation easily leads to pore collapse and uneven distribution of conductive agents, which in turn limits ion transport efficiency and charge storage capacity. The introduction of lithium-ion battery dry process technology fundamentally restructures the microcosmic structure of electrodes, laying a foundation for performance improvement.

Lithium-ion battery dry process technology adopts the preparation logic of "dry mixing + precision calendering," which can uniformly composite active materials, conductive agents, and dry binders without solvents. In the preparation of supercapacitor electrodes, this process can fully retain the porous characteristics of active materials (such as activated carbon and carbon nanotubes), avoid pore blockage caused by wet drying, and form a hierarchical pore structure of "macropores for charge storage and micropores for mass transfer." Compared with wet-process electrodes, dry-process electrodes have significantly improved specific surface area utilization and smoother ion migration channels, directly enhancing the energy density and rate performance of supercapacitors.

At the same time, lithium-ion battery dry process technology excels in constructing 3D conductive networks. Through high-speed shear mixing, conductive agents can uniformly wrap around active material particles, avoiding "transport dead zones" formed by conductive agent agglomeration in wet processes. This uniform conductive network enables supercapacitors to have lower internal resistance, less heat generation during high-frequency charging/discharging, and significantly enhanced cycle stability. For example, an enterprise used lithium-ion battery dry process technology to prepare supercapacitor electrodes; when paired with carbon nanotube conductive agents, the electrode conductivity was significantly higher than that of wet-process counterparts. The assembled supercapacitors showed much higher capacity retention after continuous charge-discharge cycles and could still operate stably in low-temperature environments, solving the low-temperature adaptation problem of rail transit energy storage in northern regions.

II. Simplifying Preparation Processes: Dry Process Technology Lowering the Industrialization Threshold of Supercapacitors

The large-scale application of supercapacitors has long been limited by complex preparation processes and high costs. Traditional wet processes involve multiple steps such as slurry preparation, solvent recovery, and high-temperature drying, which not only require large equipment investment and high energy consumption but also face pressure from environmental compliance. The mature process system of lithium-ion battery dry process technology can be directly reused in supercapacitor production, greatly simplifying processes and reducing costs.

In terms of equipment reuse, core equipment of lithium-ion battery dry process production lines, such as dry mixers and precision calenders, can be used for supercapacitor electrode preparation without major modifications. This eliminates the need for equipment unique to wet processes, such as solvent recovery towers and drying tunnels, resulting in a significant reduction in the investment cost of a single production line. Meanwhile, the dry process eliminates the need for solvent procurement, storage, and treatment, which not only reduces raw material costs but also avoids environmental treatment costs caused by solvent evaporation, aligning with the demand for green manufacturing under the "dual carbon" goals.

In terms of production efficiency, lithium-ion battery dry process technology enables "short-process" electrode preparation. In wet processes, the drying step alone takes several hours, while the dry process only requires dozens of minutes from dry mixing to calendering and forming, greatly shortening the production cycle. An energy storage enterprise transformed its lithium-ion battery dry process production line for supercapacitor production, increasing its production capacity by nearly double compared to the original wet process line and reducing the energy consumption per unit product. Additionally, due to the absence of solvent residues, the product yield increased from 85% (wet process) to over 95%, gradually demonstrating the advantages of large-scale production.

III. Expanding Application Scenarios: Dry Process Technology Promoting "Cross-Scenario Adaptation" of Supercapacitors

With the integration of lithium-ion battery dry process technology, the performance boundaries of supercapacitors have been continuously expanded, extending from traditional "instantaneous power compensation" to scenarios such as "long-term auxiliary energy storage" and "flexible portability," forming a complement to lithium-ion batteries.

In the field of new energy vehicles, supercapacitors using lithium-ion battery dry process technology, with their high power density and low internal resistance, have become "ideal partners" for power batteries. During vehicle startup and acceleration, supercapacitors can quickly release power to assist driving, reducing the load on power batteries; during braking, they can efficiently recover kinetic energy, extending the battery life. An automaker integrated dry-process supercapacitors with lithium-ion batteries into a hybrid energy storage system, significantly reducing the vehicle's 100-kilometer power consumption and improving fast-charging efficiency, alleviating the range anxiety of new energy vehicle users.

In consumer electronics and flexible energy storage scenarios, the "thin and flexible" advantages of lithium-ion battery dry process technology are more prominent. The dry process can produce ultra-thin electrodes, which, when paired with flexible current collectors, enable the manufacturing of bendable and lightweight supercapacitors. These flexible supercapacitors can fit the curved design of devices such as smart bracelets and wireless sensors, achieving "fast charging, long battery life, and flexible adaptation." For example, a brand of flexible smart watches using dry-process supercapacitors can meet a full day's usage with a 10-minute charge and show no performance degradation when worn flexibly, breaking the application limitations of traditional rigid energy storage devices.

In the field of industrial energy storage, supercapacitors prepared by lithium-ion battery dry process technology, with their high reliability and low-cost advantages, are gradually replacing some emergency power sources. For instance, in equipment such as CNC machine tools and robotic arms, dry-process supercapacitors can quickly respond to sudden power outages, supplying power to the core components of the equipment until the backup power source starts. This avoids machining accuracy deviations or data loss caused by power outages, and their long cycle life reduces the maintenance cost of frequent replacement of energy storage devices.

IV. Synergetic Technological Evolution: Mutual Empowerment Between Lithium-Ion Battery and Supercapacitor Industries

The integration of lithium-ion battery dry process technology and supercapacitors is not a one-way technology transfer but forms an industrial ecosystem of "mutual empowerment." On one hand, supercapacitors achieve performance and cost breakthroughs with the help of lithium-ion battery dry process technology, expanding their application boundaries; on the other hand, the special requirements of supercapacitors for electrode structures also drive the further upgrading of lithium-ion battery dry process technology.

To adapt to the high specific surface area active materials of supercapacitors, lithium-ion battery dry process technology has continuously optimized the selection of dry binders and calendering process parameters—for example, developing more dispersible inorganic binders and adjusting calendering pressure to retain more pores. These technological improvements have fed back into the lithium-ion battery sector, helping to enhance the performance of lithium-ion battery electrodes. Meanwhile, the large-scale application of supercapacitors has also provided a broader market space for lithium-ion battery dry process equipment, driving equipment manufacturers to develop more efficient and flexible production lines, forming a positive cycle of "technology sharing and industrial mutual promotion."

From performance breakthroughs to cost control, from scenario expansion to industrial synergy, lithium-ion battery dry process technology is injecting new vitality into supercapacitors. With the deepening integration of the two, supercapacitors will not only continue to play a role in traditional advantageous fields but also open up new tracks in scenarios such as new energy vehicles, flexible electronics, and distributed energy storage, jointly building a "high power-high energy" complementary energy storage system with lithium-ion batteries. In the future, with further iteration of lithium-ion battery dry process technology, supercapacitors are expected to truly break through the dual constraints of performance and cost, becoming a key energy storage force supporting the global energy transition.