Sodium- ion Batteries.

[AC0GV]

More knowledge to keep up on

CATL Co., Ltd: This large Chinese manufacturer of lithium-ion batteries announced in 2021 that it will bring a sodium-ion based battery to market by 2023. The "first-generation" technology uses Prussian blue analogue for the positive electrode and porous carbon for the negative electrode. They claim a specific energy density of 160 Wh/kg in their first generation battery, and expect a later generation to reach more than 200 Wh/kg.

https://www.youtube.com/watch?v=_MlVc3yNtkc

[starbrightsteve]

So.......is that good?

[Borden]

I think Tesla's 3 battery is 166 wh per kg and the new 4680 is expected to be 380 wh per kg and charge in 15min on a Tesla charger. They are the standard of excellence.

Hope the price comes down the 50% predicted with the new battery. So regular people can afford them.

[Borden]

Originally Posted by starbrightsteve

So.......is that good?

It is if price is good.

[Defenestrator]

I assume the quoted density is just for the cell and not the pack. A Battleborn LFP is around 92Wh/Kg for the full thing, so I assume something like 120-150Wh/Kg for the cells. I think the Model 3's closer to 260Wh/Kg, or 200Wh/Kg for the LFP model in China. Drastically better than the 30Wh/Kg or so you get in lead-acid.

So, generally pretty competitive with LFP. Better than the typical consumer stuff, but not as good as the higher end.

Another article mentions better temperature range tolerance, which would be pretty nice. Faster charge speed is great for grid and BEVs, but probably not super useful for RVs.

No mention of cycle life, nominal voltage, charge/discharge efficiency (probably high) or energy density.

If some of the specs work out at the cost is that much lower, they might actually displace lead-acid batteries more than LFP. At the very least, likely the last nail in the coffin for AGM.