Silicon battery with five minute fast charging

Silicon battery with five minute fast charging

Technology News |
By Nick Flaherty

Enovix in the US has shown a silicon battery with a long lifetime that can charge in five minutes.

Test cells of the 270mAh 3D Silicon Lithium-ion batteries charge from 0-80% state-of-charge in 5.2 minutes and achieve a greater than 98% charge capacity in under 10 minutes.

The company has a three-year grant form the US Department of Energy to pair a 100% active silicon anode with EV-class cathode materials and electrolytes from Mitsubishi Chemicals that are optimised for silicon anodes.

The cells have exceeded 1,000 cycles while retaining 93% of their capacity. Testing also demonstrated that after six months at elevated temperatures, Enovix batteries had minimal capacity loss. This pairing is projecting a lifetime of greater than 10 years, significantly longer than current battery cells.

The company is planning cells with a capacity of 4.1Ah with a lithium cobalt (LCO) cathode. Higher capacity cells at 44Ah and 106Ah are under development with a nickel manganese cobalt NCM811 cathode.

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“Fast charge capability can accelerate mass adoption of EVs and we’ve been able to demonstrate a level of performance that meets and exceeds many OEM roadmaps,” said Harrold Rust, Co-Founder, CEO and President of Enovix. “EV manufacturers are in pursuit of batteries that support longer range, while the public and private sectors work to increase EV driver access to fast chargers. We’re proud to support these goals to help electrify the automotive industry and demonstrate our batteries are an exciting option to power long-range, fast-charging EVs.”

“Our unique architecture enables a battery that not only charges in less than 10 minutes, but also maintains high cycle life,” said Ashok Lahiri, Co-Founder and CTO of Enovix. “We can improve battery performance today using the same chemistries, but more importantly, we can accelerate the industry’s roadmap.”

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