Microvast, General Motors Plan to Build Battery Separator Plant

November 23, 2022 by Shannon Cuthrell

In a new partnership, Microvast and General Motors will develop battery separators for future electric vehicles powered by GM’s Ultium battery platform.

General Motors recently announced it’s teaming up with Texas-based battery manufacturer Microvast to develop battery separator technology for the Detroit, Michigan-based automotive giant’s growing electric vehicle (EV) portfolio, powered by its Ultium system. 

With a $200 million grant from the U.S. Department of Energy (DOE), the pair of companies will erect a new separator plant in the U.S. to support development and manufacturing.


Microvast’s R&D, production, sales, and service center in Berlin, Germany.

Microvast’s R&D, production, sales, and service center in Berlin, Germany. Image used courtesy of Microvast

The separators will be compatible with most lithium-ion (Li-ion) cells, including those with anodes made from graphite, silicon, and lithium, as well as lithium iron phosphate and high-voltage cathodes, according to the press release. With the overall goal of improving battery life, charging, and safety, the separators will be designed to enhance the thermal stability of EV-destined batteries.

As the name suggests, separators occupy the space between the battery’s cathode and anode. As key components of EVs, separators are designed to thwart any contact between the electrodes and allow ions to travel safely from one end to the other in the cell. 

Microvast markets a polyaramid separator with substantially greater thermal stability than standard polyethylene and polypropylene separators. This enhances battery safety and enables faster charging and longer battery life for EVs and other applications.



One of Microvast’s products is its HpTO fast-charging battery cell.

One of Microvast’s products is its HpTO fast-charging battery cell. Image used courtesy of Microvast


Outside of its headquarters in the Houston metro area, the publicly traded company has additional manufacturing and research and development (R&D) facilities in Tennessee and Florida, along with a new energy division based in Colorado. Its international footprint includes its second headquarters in Berlin, Germany; an aftermarket center in London, England; and a production and R&D facility in China. 

Microvast expects the new separator facility to supply battery components to its existing battery cell plant in Clarksville, Tennessee, serving a broad customer base covering energy storage systems, EVs, and other applications


Federal Funds Bolster Plans for Battery Separator Plant

Microvast received a $200 million grant from the DOE’s Battery Materials Processing and Battery Manufacturing program—funded by the Bipartisan Infrastructure Law—to help build the facility where it will develop specialized separators with GM. The project was one of nearly two dozen to receive $2.8 billion for domestic EV battery manufacturing, as EE Power covered here and here a few weeks ago. 

According to the DOE’s announcement, Microvast matched the grant with a $304.5 million investment, intending to construct a facility capable of supplying 19 gigawatt-hours (GWh) of EV batteries. GM and Microvast plan to use U.S.-sourced raw materials and equipment manufactured domestically or by American allies. Microvast’s press release added that both companies would contribute intellectual property to develop the separator, including GM’s coating technology. 

In announcing the Microvast partnership, GM mentioned its involvement as the only auto manufacturer in the DOE’s Battery500 Consortium. The public-private project brings together national laboratories, universities, and other organizations to develop more advanced EV batteries capable of achieving higher performance and longer range at a more affordable cost. In 2021, the DOE awarded the consortium $75 million for its second research phase, distributing $15 million annually over five years.

The consortium aims to enable 1,000 charge/discharge cycles, increase batteries’ specific energy density by up to 500 W h/kg (watt-hours per kilogram), and reduce cell costs to substantially less than $100 per kilowatt-hour (kWh). Contrast the latter two goals with today’s incumbent technologies: According to the University of Washington, current Li-ion batteries have an energy density of 100 to 265 W h/kg, and BloombergNEF projects that the average battery pack will cost $135/kWh in 2022.