【24M的“半固态”电池或将让电动汽车价格更低,里程更远】美国能源部资助的创业公司24M 已交付了半固态锂离子电池的成果,其能量密度为250Wh/kg,大致与特斯拉在模型3中使用的相当。而24M宣称制造成本比普通电池低40%,能使电动汽车更持久,更轻,更便宜。24M的目标是到2019年底开发出350 Wh/kg密度的电池。

'Semi-solid state' batteries could lead to cheaper, longer-range EVs

24M aims to beat current battery tech and lower manufacturing costs.

The race to create cheaper, longer-lasting batteries just got more interesting. 24M, a US Department of Energy-funded startup, announcedthat it has delivered semi-solid state lithium-ion batteries with energy density levels of 250 watt-hours per kilogram (Wh/kg). That roughly matches Tesla's 2170 cells used in the Model 3, considered to be the most efficient cells around. The company thinks it could do even better, making EVs longer lasting, lighter and cheaper.

Regular lithium-ion batteries have electrodes arranged in multiple layers called a "jelly roll." By using different materials, 24M can build thicker electrodes and eliminate much of the manufacturing complexity. It also cuts down on the need for "filler" materials like plastics, copper and aluminum, reducing costs. The electrodes can also store more energy, making the entire battery more efficient.

24M is funded to the tune of the $7 million by the US Department of Energy, with the aim of developing cells with a 350 Wh/kg density by the end of 2019. It also supplied an industrial partner with batteries that achieved an energy density of 280 Wh/kg, and has seen up to 350 Wh/kg in the lab.

By contrast, Tesla's state-of-the-art 2170 Li-ion cells reportedly have energy densities up to around 257 Wh/kg. It recently announced the acquisition of Maxwell Technologies, which could help it significantly improve its current batteries. That deal is not yet closed, however, and Maxwell investors are reportedly suing to block it.

24M has touted manufacturing costs 40 percent lower than regular batteries. However, it has yet to reveal much about the battery chemistry and didn't say how many batteries it actually shipped -- and the landscape is littered with failed battery startups. Still, 24M's tech appears to be more than just a lab experiment and could boost battery technology in the near future. Plus, the green transportation industry needs all the tech it can get to meet its very ambitious goals.




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