SK On’s Super Fast Battery with charged (80%) in just 18 minutes
SK On exhibited its Super Fast Battery (SF Battery) at CES 2023, the world’s largest electronics/IT exhibition, on January 5 (local time), Head of SK On Cell Development Office 2 Park Ki-soo introduced SF Battery’s development process as follows. “The finality of an electric vehicle depends on how further and faster it could go, and how quickly it can be recharged. Based on this insight, SK On had already embarked on the technology development, meeting the needs of global automakers.”
The key to fast charging technology lies in how to lower the resistance of the anode when lithium is inserted during charging. SK On has developed a new material that can increase the charging speed along with a special coating method that dramatically lowers resistance. A new process was also applied to minimize the use of styrene butadiene rubbers (SBR) adhesive that causes cell resistance in coating.
Thanks to the development of this technology, SK On and the automaker created a consultative group for performance and safety verification to detect any unexpected problems when battery is installed in a vehicle. A SK On official said, “We were able to solve major problems through closer cooperation between two companies,” and “the driving force behind the joint research was trust in each other.”
The success of the SF Battery is even more meaningful in that SK On has overcome fast charging’s fundamental limitation: shortened battery life. For example, if an EV’s quality assurance standard covers 1,000 charge cycles, the warranty for fast charging is generally limited to 300 cycles (700 cycles for normal charging). However, SF Battery can run all 1,000 cycles with fast charging alone,, securing both ‘fast charging’ and ‘battery life’.
This was a result obtained after running multiple performance tests, almost as three times as usual. This accomplishment was achieved in three years since SK On organized its own TF team, and one year since SK On started the joint research with the automaker that requested the development of SF Battery . When the EV equipped with a SF Battery was released in 2021, the market reaction was explosive. The annual sales target was almost achieved on the first day of the pre-contract in February. The EV swept major awards, such as “World Car of the Year” in “2022 World Car Awards.”
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