Enovix, a California-based company, has invented a battery for electric cars that can recharge its charge in minutes, as fast as gas-powered cars. It also speaks of high efficiency, since even after thousands of charge cycles, 93% of the original capacity is retained.
Enovix has demonstrated the ability to quickly charge 0.27 Ah EV batteries in its silicon lithium-ion batteries with an innovative 3D architecture. Their cells contain a 100% active silicon anode – these anodes can theoretically store twice as much lithium compared to graphite anodes, which are used in almost all lithium-ion batteries today (1800 mAh / cm 3 vs 800 mAh / cm 3 ) .
However, the high density of silicon has its drawbacks, which the company managed to get around. In particular, they surrounded the cells with a stainless steel system to prevent the battery from swelling, used a “pre-lithiation” process, introduced a limit on swelling, and much more. As a result, their battery charges from zero to 80% in just 5.2 minutes and to 98% in less than 10 minutes. These figures exceed the US Advanced Battery Consortium (USABC) goal of reaching an 80% charge in 15 minutes.
“EV manufacturers are looking for long-range batteries, while the public and private sectors are working to increase EV owners’ access to fast chargers. We are proud to support both of these goals to help electrify the automotive industry and demonstrate that our batteries are a great option to power fast-charging long-range electric vehicles,” said Harrold Rast, CEO and President of Enovix.