Lithium Battery Industry Embraces Process Revolution: Dry Electrode Technology Usheres in a New Era

Driven by the dual forces of the global "dual-carbon" goals and the cost reduction pressure of power batteries, the lithium battery industry is standing at a critical point of manufacturing process transformation. The environmental bottlenecks and cost constraints of traditional wet electrode processes are becoming increasingly prominent, while dry electrode technology, with its inherent advantages of "solvent-free and low energy consumption", is pushing the industry into a new era of green manufacturing.

Dilemma of Wet Process: Dual Shackles of Environmental Protection and Cost

The expansion of the power battery industry is hitting the "ceiling" of traditional manufacturing processes. It is predicted that to achieve the large-scale popularization of electric vehicles by 2030, the production cost of lithium batteries needs to drop to 0.5 yuan/Wh—a goal that makes the wet electrode process relying on NMP solvents increasingly unsustainable.

According to the interpretation documents of the Lithium Battery Industry Specification Conditions issued by China's Ministry of Industry and Information Technology and related research reports, the wet process (NMP solvent link) has significant drawbacks: NMP recovery alone accounts for 20%-25% of the cost of cathode materials, and its VOC emissions account for more than 40% of the entire process, becoming a bottleneck for green development. In addition, NMP has been included in the List of Key Controlled New Pollutants by the Ministry of Ecology and Environment, with the annual recovery and maintenance cost of a single line exceeding 10 million yuan, and the risk of environmental compliance remains high.

Technical bottlenecks are also prominent. The electrode pore structure formed during solvent volatilization has long trapped the compaction density of lithium iron phosphate cathodes at around 2.3g/cm³, making it difficult to break through the performance ceiling. Moreover, when manufacturing ultra-thick electrodes of 200μm or more, cracks easily occur in wet coating, directly restricting the industrialization of solid-state batteries.

Global Race: Dry Technology Becomes the Next-Generation Competitive Focus

Faced with the predicament of the wet process, dry electrode technology has become a strategic high ground for global giants. Tesla mastered binder fibrillation technology through the acquisition of Maxwell, while Toyota is increasing investment in dry processes to adapt to solid-state batteries, driving a 300% surge in global dry electrode patents in the past five years. Among them, China's patent applications account for 35%, showing strong innovative momentum in this technological revolution.

However, the industry's path to breakthrough is not smooth. Currently, more than 90% of lithium batteries worldwide still rely on wet processes. Even Maxwell's technology, which has achieved commercial verification, faces difficulties such as equipment dependence on imports and patent blockades on PTFE binder modification technology. Domestic enterprises previously mostly stayed in the laboratory stage, with "bottleneck" issues such as mass production consistency control and fibrillation equipment precision remaining obstacles to large-scale implementation.

Chinese Enterprise's Technological Breakthrough: Tsingyane Builds the First 0.1GWh Fully Automatic Closed-Loop Production Line

In this technological race, Chinese local enterprises are achieving key breakthroughs. Relying on 18 years of technical accumulation from the Shenzhen Tsinghua University Research Institute, Tsingyane's developed dry electrode technology has formed a three-in-one breakthrough path of "process-materials-equipment". Its newly built 0.1GWh fully automatic through-production line integrates four core links: automatic feeding, intelligent mixing, roll forming, and pole piece lamination, building a full-process closed loop for dry manufacturing and becoming a leading enterprise in China's lithium battery dry process.

"Whether in the machine direction (MD) or transverse direction (TD), we have made significant progress, with the goal of controlling areal density fluctuation within 0.3%, which is a leading level comparable to wet coating machines," said Dr. Wang Chen, Chairman of Tsingyane. The production line adopts an innovative dry powder mixing process, completely abandoning the use of solvents in traditional wet processes, reducing production energy consumption by more than 30%, while significantly improving the uniformity and consistency of electrodes.

"Industry-academia-research collaborative innovation is the key to breaking the deadlock," many industry experts said. Only by connecting the entire chain of basic material research and development, equipment precision improvement, and process standard formulation can dry electrode technology truly move from "laboratories" to "large factories", promoting the lithium battery industry to complete the historic leap from "scale expansion" to "quality and efficiency upgrading".