20 November 2022
American and European companies are racing to develop new batteries for electric vehicles using two readily available and less costly materials: sodium and sulfur.
The new batteries could help bring more electric vehicles, or EVs, to the market and reduce China's lead in battery production.
Today's EVs run on lithium-ion batteries which cost about $10,000 to $12,000 to make. They are mostly made with lithium, cobalt, manganese and nickel. And the materials have increased in price during the last two years.
The new batteries under development could cost one-third to two-thirds less. But their promise depends on overcoming difficulties in working with the materials. Sodium does not hold as much energy, while sulfur can easily damage key parts of a battery.
Still, companies have brought in millions of dollars and government support to develop new kinds of batteries - called sodium-ion or lithium-sulfur.
Lithium-sulfur batteries
Several firms in the United States, Germany, and Norway are developing lithium-sulfur batteries that do not need the costly nickel or cobalt. They include Lyten and Conamix in the U.S., Germany's Theion and Norway's Morrow.
Ulrich Ehmes is the chief executive of Theion in Berlin, Germany. He says sulfur is so corrosive that it kills a battery after 30 charges. But he said the company has developed a way to protect the lithium-sulfur electrode so it can last an EV's lifetime. An electrode is an element through which electricity flows into or out of a battery or other device.
Ehmes believes its lithium-sulfur batteries could hold three times more energy than the most powerful lithium-ion batteries. He says sulfur batteries charge very fast and cut battery costs by two-thirds. Current lithium-ion batteries generally keep their power for 160,000 to 320,000 kilometers of driving.
"It's cheap, it's high energy density, so it seems to be a no-brainer," Ehmes said.
Ehmes said the company plans to begin tests with automakers in 2024. And he expects the first production for EV use around 2027.
Sodium-ion batteries
U.S.-based Amandarry and British company AMTE Power are developing sodium-ion batteries. They do not need cobalt, nickel, and even lithium which are the three most expensive battery materials.
Sodium-ion batteries could be useful for EVs that require less power.
Amy Chen is an executive at Amandarry. She said the first use of its batteries will likely be electric two-wheelers. In addition to lower cost, Chen said Amandarry's batteries can charge really fast — 80 percent in 15 minutes.
AMTE Power chief Kevin Brundish said his company is planning to launch its batteries for storage systems where energy demand is lower.
Some Asian firms are also working on these new kinds of batteries.
China's CATL has said it plans to begin producing sodium-ion batteries in 2023. And Korea's LG Energy Solution aims to start making lithium-sulfur batteries by 2025.
Some automakers are testing new types of batteries and keeping an eye on their development.
"Over time, more (battery) chemistries will come out," said Linda Zhang, chief engineer on Ford's F150 Lightning electric truck. "It would be silly not to take advantage of those chemistries."
I'm Andrew Smith.
Nick Carey and Paul Lienert reported this story for Reuters. Andrew Smith adapted it for VOA Learning English.
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Words in This Story
corrosive–adj. able to destroy a solid material by a chemical reaction
cheap –adj. low in cost
no-brainer --adj. erstood or easily decided upon because of a clearly better choice
silly -adj. unwise, a mistake in judgement, foolish
take advantage of -adj. use something for one's benefit or benefit from a good opportunity