SF Battery with 18-minute quick charge presented as global novelty

Back in 2018, the South Korean company SK On received an order from a global car manufacturer to develop an EV battery with fast charging within 18 minutes. In the course of development, this resulted in the so-called SF Battery (Super Fast Battery), which received the “Best of Innovation” award in the “Embedded Technologies” category at the CES technology trade fair held in January.
At the time of commissioning, charging times of 18 minutes for EV batteries were considered a challenge in the industry. In 2018, most car manufacturers demanded fast charging times of 30 minutes from their development departments or suppliers, while the realistic values were around 50 minutes. SK On was nevertheless confident of achieving the 18-minute target, as it had been researching batteries with fast-charging capabilities since 2016. “The spread of EVs depended on their range, speed and charging time,” said Park Ki-soo, SK On vice president and head of cell development. Battery production may involve, among other things, components and equipment that require KC certification to be used in the Korean market.

The key to fast charging is to reduce the anode resistance in lithium batteries. SK On has developed a special method for coating the anode and a new battery material for this purpose. SK On has also optimised the manufacturing process by using a new adhesive inside the cells called “SBR”. Afterwards, tests regarding the reliability and safety of the new SF battery were carried out by the car manufacturer who commissioned the battery. According to SK On, the SF battery can also tolerate more frequent fast charging and thus achieves a longer lifespan. In 2021, a newly launched EV was equipped with the SF battery and won numerous awards. At SK Group’s CES booth, the SF battery was one of the main attractions and attracted many visitors. SK On plans to launch an EV battery that can be charged in just 10 minutes in the coming years.

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Julian Busch

About the author: Julian Busch is the founder and managing director of MPR International GmbH

Publisher: MPR International GmbH

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