The paper has drawn criticism from other battery researchers, who tell Axios one aspect of the new battery cells — the relative dielectric constant — is higher than ever before recorded in any material known to science. That metric measures how much energy can be stored in an electric field. That extraordinarily high number raises some red flags, those other researchers say. They also note the research does not indicate the batteries retain their charge when unplugged.

Six researchers contacted by Axios said they had never encountered a rise, rather than a decline, in capacity as a battery is cycled. “The way to think about it is that you have a car that can travel 200 miles, and after five years it can go 800 miles,” said Venkat Viswanathan, an assistant professor at Carnegie-Mellon University. Gerbrand Ceder, a professor at Cal Berkeley, sniffed that Goodenough’s new paper “is not what it is stated to be. Most of us have moved on from this saga.”
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