Group1 recently launched the world's first potassium-ion battery, operating at 3.7V. (Image Credit: Group1)
Group1 recently developed and launched the first-ever 18650 potassium-ion battery, which could replace lithium-ion batteries powering portable electronic devices. This battery technology, revealed at the 14th annual Beyond Lithium Conference, is encased in a cylindrical 18 mm x 65 mm form factor --- similar to lithium-ion batteries.
The team developed this potassium-ion battery by combining it with a commercial-grade graphite anode and electrolyte formulations and separators. Its potassium Prussian white cathode is created via low-temperature processes. This also means the potassium-ion battery doesn't require any important minerals, including nickel, cobalt, lithium, and copper.
At first, the startup produced a coin-cell battery before moving on to a pouch-cell and recently developed the first 18650 potassium-ion battery. Under this category, the battery could be deployed in EVs, portable devices, and power banks. Group1 says this new advancement promises improved safety, performance, and cost-effectiveness compared to LiFePo4 (LFP)-based Li-ion batteries and sodium-ion batteries.
The potassium-ion batteries have a 3.7V rating and surpassed performance expectations, paving the way toward a gravimetric energy density of 160-180 Wh/kg --- comparable with lithium-ion phosphate lithium-ion batteries (LFP-LIB). That high energy density is indicative of the battery's ability to store a considerable amount of energy relative to its mass. Group1 says it has "superior cycle life and excellent discharge capability."
During tests, the battery demonstrated cycle longevity, which means it withstands several charging/discharging cycles before losing capacity. Additionally, the potassium-ion battery has a robust discharge, delivering power effectively when needed.
The 18650 format enables the potassium-ion battery to integrate into various devices and applications without compromising costs on redesigns. "It seamlessly integrates into existing LIB processes, ensuring a smooth transition for manufacturers," according to the press release.
The startup sent samples to key Tier LOEMs and battery cell manufacturers to adopt the technology in the future. "We are excited to introduce the world's first 18650 Potassium-ion battery," said Alexander Girau, CEO of Group1. "This innovation represents years of dedicated research and product development. By distributing samples to our partners among Tier 1 OEMs and cell manufacturers, we are paving the way for widespread adoption of this transformative technology."
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