The Energy Storage Report 2024

Now available to download, covering deployments, technology, policy and finance in the energy storage market

Tesla acquires Maxwell Technologies, rival warns of ‘R&D hell’

Maxwell Technologies containerised energy storage system project. Image: Maxwell Technologies.

Tesla will acquire Maxwell Technologies, it was announced this week, although it is not clear yet which of Maxwell’s product lines, including ultracapacitors, are of most interest to the Silicon Valley automaker and new energy company.

Tesla’s acquisition ‘target’, headquartered in the US with offices in Germany, China and South Korea, manufactures and markets solutions and products for energy storage and power delivery. These include ultracapacitors, which offer high power density and rapid charge and discharge functions. Tesla’s Elon Musk has been quoted as having a personal fascination with ultracapacitors according to various interviews.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Maxwell is also developing dry battery electrode technology, which the company said “has the potential to be a revolutionary technology within the battery industry with a substantial market opportunity”, especially suitable for electric vehicles. The company claims it can “create significant performance and cost benefits” compared to wet electrode technology currently used by most manufacturers of lithium batteries.

Tesla: ‘always looking for potential acquisitions’

Maxwell said yesterday in a statement that with shares valued at US$4.75 in the upcoming offer, the company had entered a definitive merger agreement with Tesla, Inc. Tesla will make an all stock exchange offer for all issued and outstanding shares, with Maxwell to become a merged and wholly-owned subsidiary of Tesla. The deal is thought to value Maxwell at around US$218 million.

A Tesla representative did not deny the news when asked by last night. By way of confirmation, the spokesperson issued a fairly nondescript company statement as follows:

“We are always looking for potential acquisitions that make sense for the business and support Tesla’s mission to accelerate the world’s transition to sustainable energy.” asked whether access to the ultracapacitor technology or to the dry electrode technologies would be of primary interest to Tesla. However, the Tesla representative said the company would not be “sharing further comment at this time”. Similarly, a Maxwell Technologies representative told that the company “will not be conducting interviews or providing additional commentary…at this time”.

Ultracapactor rival sounds warning

Nonetheless, Taavi Madiberk, CEO of Skeleton Technologies, a European manufacturer of ultra- and super capacitors, was quick to offer a take on the news last night.

“Tesla has made the right move – the ultracapacitor manufacturer acquisition highlights the evident limits of Li-ion batteries in terms of fast charging and thermal management, whereas ultracapacitors offer fast charging in seconds and ultra-high efficiency, allowing for better thermal management and much longer life-time.”

While Madiberk said Tesla has made the right move, he then immediately moved to tout the competitive advantages the Skeleton Technologies CEO claims his devices have over those of rival makers, including Maxwell.

Maxwell Technologies’ ultracapacitors have an energy density of 7Wh per kg, while Skeleton Tech curved graphene ultra capacitors reach 20Wh per kg. Madiberk said that Maxwell/Tesla has a leading position in the automotive industry but that they might struggle to close that so-called “innovation gap”.

“Mr. Musk studied ultracapacitors in Stanford during his PhD, but he is underestimating the “R&D hell” to get to higher energy density ultracapacitors.

“We are expanding our manufacturing and R&D capabilities in Germany and have a clear road-map of hitting 60Wh/kg, while retaining charging times measured in seconds and a cost point lower than high power batteries – we do not see Tesla closing the gap any time soon. In fact, key engineering people from Maxwell/Tesla have joined Skeleton recently,” Madiberk claimed.

Email Newsletter