VW-backed QuantumScape unveils solid-state data for 'faster charging' EV batteries

by Michael Green
Solid-state batteries 'have potential to narrow the gap between EVs and internal combustion vehicles' - CEO Jagdeep Singh.
US solid-state battery start-up QuantumScape has released new performance data indicating that its solid-state batteries can be charged to as much as 80% of capacity in 15 minutes.

The company, which is backed by investors including Volkswagen, said the data also showed its proprietary battery tech is capable of lasting "hundreds of thousands of miles” – and can operate at a wide range of temperatures including -30°C”.

Founder and CEO Jagdeep Singh said: "We believe that the performance data we’ve unveiled shows that solid-state batteries have the potential to narrow the gap between electric vehicles and internal combustion vehicles and help enable EVs to become the world’s dominant form of transportation.”

"Lithium-ion provided an important stepping stone to power the first generation of EVs. We believe QuantumScape’s lithium-metal solid-state battery technology opens the automotive industry up to the next generation battery and creates a foundation for the transition to a more fully electrified automotive fleet.”

'Robust performance'

The results are based on testing of single-layer battery cells. The company said they were large-area single-layer pouch cells in the target commercial form factor, with zero excess lithium on the anode and thick cathodes (>3mAh/cm2), running at rates of one-hour charge and discharge (1C charge and 1C discharge) at 30°C.

"These tests demonstrated robust performance of these single layer pouch cells even at these high rates, resulting in retained capacity of greater than 80% after 800 cycles – demonstrating high coulombic efficiency of greater than 99.97%,” the company said.

QuantumScape’s solid-state separator replaces the organic separator used in conventional cells, enabling the elimination of the carbon or carbon/silicon anode and the realisation of an "anode-less” architecture, with zero excess lithium.

In such an architecture, the company said an anode of pure metallic lithium is formed in situ when the finished cell is charged, rather than when the cell is produced.

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