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Storedot’s New Battery Tech To Reduce Charge Time By 50%

Israeli company Storedot, claims to be the first to have produced extreme fast charge (XFC) lithium-ion battery cells. The cells, based on silicon-dominant anodes, are said to reduce charge time by 50% with no increase in cost.

Silicon, as a replacement for graphite to store and release lithium ions during charge and discharge, is the big thing in battery technology today. It can store about 10 times more lithium ions than graphite and allows much faster charging. The problem is that during charging and discharging, it changes volume by as much as 300%, which is enough to mechanically destroy a cell.

Storedot has also patented a ‘self-healing’ technology to seamlessly repair individual damaged cells in the background. It identifies a cell or string of cells that are not performing as they should or are overheating, takes them offline and reconditions them back to 100% before bringing them back online. The process is designed to happen during use and without the driver noticing any difference in driving or performance.

The repair process is especially important for silicon-dominant technology because the expansion and contraction can cause cracks in the solid electrolyte interphase (SEI). So unless checked, it would continually reform, consuming lithium in the process and ageing the battery.

Storedot also managed to mass-produce silicon-dominant cells that can withstand extreme fast charging over 850 consecutive 10-minute cycles. In addition, also retain 80% capacity, and it has a 10% expansion rate and a capacity of 300Wh/kg (compared with around 140Wh/kg for a typical production 64kWh battery today).

The new XFC technology with self-healing capability will be in production by 2024, followed by solid-state technology in 2028.

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