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The 5kg is for a target prototype. They haven’t achieved that, and it doesn’t include the protector or valve. 5kg for 3.3kWh (they claim 3.3kWh per unit, not 4.
by Robotbeat 4y ago
The 5kg is for a target prototype. They haven’t achieved that, and it doesn’t include the protector or valve. 5kg for 3.3kWh (they claim 3.3kWh per unit, not 4.8kWh)
Meanwhile, the best prototype lithium ion cells are in the 400-650Wh/kg range, in other words identical on the high end.
What’s the point of hydrogen again?
- avmich 4y agoHydrogen alone clearly has more energy density than batteries. The question is how much hydrogen containers would reduce that advantage. So far hydrogen at least has the benefit of speed of refilling. In some applications, like aviation, hydrogen could bring benefit of reducing mass with spent fuel, something which batteries don't do. I think 5kg containers for 3.3kWh is a good number, especially comparing with batteries, which had recent decades of targeted development. At least the technology is nowhere near of clearly losing to alternatives. "Green hydrogen" can definitely be obtained without generating CO2, the questions are elsewhere.
- Robotbeat 4y agoHydrogen fuel cells were developed in the 1830s (concept developed in 1801), commercialized in the 1930s, and the first hydrogen fuel cell vehicles were developed in the 1950s. Was used in NASA’s Gemini program. Rechargeable Lithium ion is relatively new, having started development only in the 1960s and in modern form not until the 1980s, being used for practical applications only starting in the 1990s.
- avmich 4y agoI know all of that and still would consider efforts which went into recent batteries technologies as more targeted and supported by industry, than similar for hydrogen-based power transformations.