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five μ Mass supply of m wet diaphragm


As the first diaphragm enterprise in China to realize the import substitution of 5um ultra-thin diaphragm products, Newmi Technology has achieved stable production and stable supply. The road to localization has contributed.

In terms of production capacity, Newmi Technology currently has four high-performance wet-process lithium-ion battery separator production lines with an annual production capacity of 130 million square meters; six coated diaphragm production lines with an annual production capacity of 65 million square meters; three new wet-process production lines will be built in 2019 with a total production capacity of 150 million square meters.

Subsidiary Kunming Newmi has two dry-process double-drawing three-layer composite lithium-ion battery separator production lines with an annual production capacity of 60 million square meters. The company's production lines all use imported equipment. Except for the semi-automatic cutting process, other processes are all automatic assembly line operations.

It is worth mentioning that Newmi Technology pays attention to process experiments and technological improvements, and continuously improves its research and development capabilities. Newmi Technology has more than 20 R&D staff, accounting for about 3% of the total staff; it has a dedicated R&D organization responsible for the design and development, application and evaluation of new products, and invests about 2 million yuan in R&D every year. Newmi Technology currently has 17 patents, including 1 invention patent and 16 utility model patents; 3 patents are being declared and are in the review process.

At the beginning of 2017, Newmi Technology successfully developed a HS (High Strength) 12μm product. Compared with the column products of the same thickness in the market, the strength and breakdown voltage resistance of this product are much higher than the conventional products in the market, while maintaining the stability of the internal structure of the diaphragm and the uniformity of the pores.

According to reports, the strength of the product with a thickness of 12 μm has reached the product level of 16 μm. The application of a thinner separator in the battery system not only improves the capacity of the battery, but also ensures its safety performance. The more perfect crystallinity also enables the separator to work in the battery. The stability of the time is increased, which ensures the safe and normal operation of the battery. 12μm products have been officially supplied in batches in April this year.

In 2018, Newmi Technology independently developed and mass-produced ultra-thin H-HP4um, which is the thinnest lithium-ion battery separator in China. At the same time, according to market demand, it developed and mass-produced HL (low transparency) products.

Newmi Technology said that in the next 2-3 years, the company's total production capacity will reach an annual output of 500 million square meters of high-performance lithium battery separators. Relying on a strong technical team, self-developed leading technology and advanced production equipment, it is committed to providing customers with First-class diaphragm products will become a leading enterprise in the lithium battery diaphragm industry.

In terms of cooperative enterprises, Newmi Technology has always adhered to the business philosophy of quality first, and selected world-class raw materials for diaphragm manufacturing. Since the establishment of the company in 2010, it has continuously cultivated the digital battery market. Liwei, Zhuhai Coslight and other well-known domestic and foreign enterprises cooperate. In particular, the stable production and supply of 5um ultra-thin separators has become the first domestic product to replace imports, and has contributed to the localization of materials for domestic high-quality battery companies.

[Cutting-edge technology] Stabilized silver membranes provide portable possibilities for solid oxide fuel cells

Solid oxide fuel cells (SOFC) can provide a stable and efficient way to generate clean electrochemical power, but are limited to portable due to their high operating temperature There is no real operability in the equipment.

A new design and production strategy developed by Florencia Edith Wiria of A*STAR Singapore Institute of Manufacturing Technology and Pei-Chen Su of Nanyang Technological University could help push SOFCs into mainstream use.

Micro-SOFCs can provide more power than existing batteries in an environmentally friendly manner, and silver is an attractive and affordable alternative to the expensive platinum cathodes used in current micro-SOFC designs.

But silver electrodes melt easily, so they can't maintain the finely porous structure needed for efficient electrochemical reactions in the 500-1,000-degree Celsius temperature range where these devices typically operate. So Wiria and Su sought to develop a heat-resistant version of the system.

"This will allow SOFCs to expand from traditional stationary power sources to portable applications," Wiria said.

Wiria and Su employed a "wet chemical infiltration" strategy, in which they coated a thin film of silver with a layer of samarium-doped ceria (SDC), using a 3-D printer to gain fine control over the electrode design. "We hope to use this ability to print fine, complex structures to enable power sources of various shapes," Wiria added. The resulting silver film retained the desired nanoscale structure while being protected by the SDC crystalline layer.

While conventional silver films melt rapidly into amorphous polymers as temperatures exceed 300-400 degrees Celsius, the SDC-infiltrated films remained largely unchanged even at 500 degrees Celsius.

This enhanced cathode integrity translated into robust fuel cell performance that outperformed even platinum electrodes after more than a day of continuous operation. "We significantly improved the thermal stability of solid oxide fuel cells with nanoporous silver cathodes, reducing that performance from the current 73.6 percent to 7.9 percent," Wiria said.

Microscopic analysis confirmed that even after this test, the electrode microstructure remained largely intact, and the infiltrated cathode showed only modest additional degradation after 60 hours of operation.

This work promises to greatly expand the utility of microscale SOFCs, and Wiria and Su are looking for further improvements to allow greater stability and flexibility in cathode design.

"We are currently trying to use a 'core-shell' approach to fully encapsulate silver nanoparticles," explains Wiria, "while investigating other 3D printing methods to produce SDC-infiltrated SOFCs."

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