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At his 95th birthday party, last July. Photo: Marsha Miller/UT Austin

The world's most accomplished battery inventor says he has a new cell aimed at electric cars that delivers double the energy density of existing lithium-ion, and, in a first, actually achieves an increase in capacity when it's charged and discharged.

Quick take: The claims, among the most ambitious by any major researcher in recent memory, come in a paper co-authored by John Goodenough, a celebrated 95-year-old professor at the University of Texas who invented the battery used by almost every cell phone on the planet. It was published in the prestigious Journal of the American Chemical Society with co-authors Maria Helena Braga and two other researchers.

In addition to its assertions on energy density and capacity, the paper's main claims include:

  • It is a solid state battery, using no liquid electrolyte, the main cause of lithium-ion battery fires.
  • It uses no cobalt, an expensive metal contained in almost all commercial lithium-ion batteries. In recent months, China has all-but cornered the market for cobalt, whose price has sky-rocketed.
  • It can be cycled more than 23,000 times, while the typical electric car battery cycles 1,000 times.

Goodenough, a perennial candidate for a Nobel prize in chemistry, commands enormous respect in the field, having had himself invented or had a hand in creating almost every major lithium-ion battery currently sold.

But, like research published a little over a year ago by Braga and Goodenough, the paper has raised questions in the battery community. In interviews with Axios, researchers raised the following technical questions:

  • A record-high measure: A metric known as the "relative dielectric constant," which measures how much energy can be stored in an electric field, may be higher than ever recorded in a material.
  • Energy storage: The paper leaves unclear whether a charged battery, once unplugged from its source, can retain that energy or whether the charge will simply vanish, leaving a user, such as a driver, with a dead battery.
  • Rising capacity: Six battery researchers contacted by Axios said that, apart from as an errant anomaly, they had never encountered a rise, rather than a decline, in capacity as a battery is cycled.

Short of seeing added data, all said the findings do not add up. "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, said their work on these papers "is not what it is stated to be. Most of us have moved on from this saga."

I asked Goodenough and Braga about the doubts. Braga responded: "There are a lot of interests. But time will be on our side." In a followup email, she said,

"Data is data and we have similar data from many different cells, in four different instruments, different labs, glove box. And at the end of the day, the LEDs are lit for days with a very small amount of active material after having cycled for more than 23,000 times."

[In an email exchange after publication of this post, Braga said the battery does hold a charge when unplugged.] Goodenough did not respond to emails seeking comment.

Go deeper: Panasonic is developing cobalt-free batteries, Reuters reports.

This post has been updated with Braga's added comment.

Go deeper

In photos: Twin Cities on edge after Daunte Wright shooting

Demonstrators shout "Don't shoot" at the police after curfew on April 12 as they protest the death of Daunte Wright, who was shot and killed by a police officer in Brooklyn Center, Minnesota, a day earlier. Photo: Kerem Yucel/AFP via Getty Images

There were tense scenes in the Twin Cities suburb of Brooklyn Center Monday night, after demonstrators defied a 7 p.m. curfew to protest for a second night the fatal police shooting of Daunte Wright.

The big picture: The curfew was announced following a night of protests and unrest over the killing of Wright, 20, during a traffic stop Sunday. Following peaceful protests and a daytime vigil, police again deployed tear gas during clashes with protesters Monday night, according to reporters on the scene.

In photos: Life along the U.S.-Mexico border

Children at the border of the Puerto de Anapra colonia of Ciudad Juárez, Mexico, hang on a border fence and look to Sunland Park, N.M. Photo: Russell Contreras/Axios

Axios traveled to McAllen and El Paso, Texas, and Ciudad Juárez, Mexico, to see how the communities are responding to an increase of migrants from Central America.

Of note: The region in South and West Texas are among the poorest in the nation and rarely are the regions covered in depth beyond the soundbites and press conference. Axios reporters Stef Kight and Russell Contreras walked the streets of McAllen, El Paso, Texas, and Ciudad Juárez to record images that struck them.

Updated 3 hours ago - Axios Twin Cities

Police: Officer who shot Daunte Wright accidentally pulled gun instead of Taser

The officer who fatally shot Daunte Wright, a 20-year-old Black man, outside Minneapolis Sunday appeared to have inadvertently pulled out her gun instead of a Taser, police said.

What's new: Officials on Monday night identified the officer involved in the shooting as Kim Potter, who has been with the Brooklyn Center Police Department for 26 years.

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