News On Japan

Kyoto University and Toyota test 1,000 km per-charge EV battery

Aug 14 (Nikkei) - A team of researchers from Kyoto University and Toyota Motor is making solid progress developing next-generation battery technology that has the potential to cram far more energy into a small, lightweight package than today's standard lithium-ion, or li-ion, batteries.

The new fluoride-ion battery the researchers are working on, which would hold about seven times as much energy per unit of weight as conventional li-ion batteries, could allow electric vehicles to run 1,000 km on a single charge.

The team has developed a prototype rechargeable battery based on fluoride, the anion -- the negatively charged ion -- of elemental fluorine. A fluoride-ion battery, or FIB, generates electricity by shuttling fluoride ions from one electrode to the other through a fluoride-ion-conducting electrolyte.

The prototype was created by a team of researchers led by Yoshiharu Uchimoto, a professor at Kyoto University. It uses an anode, or negatively charged electrode, composed of fluorine, copper and cobalt, and a cathode, or positively charged electrode, made mainly of lanthanum. The researchers have confirmed that the prototype has a higher theoretical energy density, potentially giving it a range up to seven times longer than today's li-ion batteries.

The ranges of electric vehicles have increased significantly over the years, due to improvements in li-ion battery performance and deceleration energy recovery systems, which recharge the battery using electricity generated by braking. Some of the latest EV models from Tesla and Nissan Motor, for instance, can run up to 600 km per charge under ideal conditions. But experts say there is a theoretical limit to the energy density of li-ion batteries, which means their range cannot be extended much further.

The researchers at Kyoto University and Toyota have turned to the FIB because of its theoretically higher energy density. This translates to smaller, lighter batteries with same performance as li-ion cells, or, if they were made the same size and weight as today's li-ion batteries, could put out juice for longer between charges.

The researchers have gone for a solid electrolyte in place of the liquid ones typically used in li-ion batteries. One key advantage of such solid-state batteries is that they cannot catch fire, which means engineers do not have to worry about creating systems to prevent overheating.

The researchers are betting that a solid-state FIB battery can solve the puzzle of building an EV that can run 1,000 km on a single charge. Many experts remain skeptical, however.

News On Japan
POPULAR NEWS

A passenger car was captured speeding across the frame from left to right by a security camera just moments before a fatal crash in Iida City, Nagano Prefecture, that claimed the lives of four vocational school students.

A fire broke out on the evening of April 25th on an electronic billboard attached to the Yodobashi Camera commercial complex in front of JR Osaka Station, prompting a large emergency response. No injuries were reported.

Organic fluorine compounds known as PFAS—suspected to be harmful to human health—have been detected at concentrations exceeding the national provisional target in rivers and groundwater at 242 sites across 22 prefectures, according to a government survey.

The Japanese government will begin issuing blue tickets for bicycle traffic violations in April 2026, with fines including 5,000 yen for ignoring stop signs and up to 12,000 yen for riding while using a smartphone.

A 26-year-old woman was arrested in the early hours of April 24th in Kasuya Town, Fukuoka Prefecture, on suspicion of driving under the influence of alcohol. While admitting to the offense, she claimed, "I ate chocolate that contained alcohol."

MEDIA CHANNELS
         

MORE Society NEWS

After 77 years, Tokyo is set to return blue skies to Nihonbashi as the city buries its expressways underground and reimagines its historic heart.

The Emperor and Empress attended the Greenery Ceremony, an annual event honoring researchers who have made outstanding contributions in fields such as plant and forest conservation.

Nearly three months after a road collapse in Yashio City, Saitama Prefecture, authorities are preparing to resume the search for the missing truck driver as early as next week.

The Japanese government will begin issuing blue tickets for bicycle traffic violations in April 2026, with fines including 5,000 yen for ignoring stop signs and up to 12,000 yen for riding while using a smartphone.

A woman’s body discovered in a freezer at a residence in Nagahama, Shiga Prefecture, is now believed to have been concealed there for approximately four and a half years, police announced.

A 26-year-old woman was arrested in the early hours of April 24th in Kasuya Town, Fukuoka Prefecture, on suspicion of driving under the influence of alcohol. While admitting to the offense, she claimed, "I ate chocolate that contained alcohol."

A man who was charged with committing an act of abuse against his young daughter and distributing a video of the incident through a private social media group admitted to the allegations during his first court appearance.

A monkey walking upright on two legs was spotted in a residential area of Tokyo on April 23rd, drawing attention as it crossed a street in the rain before entering a nearby field and munching on crops.