Quote from: anan on May 26, 2025, 11:46:59In theory, SSBs should offer improved battery metrics in all categories: capacity, charge rate, lifespan. But somehow no one can nail the lifespan improvement. To the point that it seems that everyone stopped reporting on this important metric.
It seems that materials needed to make solid state batteries possible are also causing shortened lifespans. If they put them in cars then they need to meet an 8 year warranty for 80% remaining capacity. But the lack of actual hard numbers is quite concerning.

I think that BMW use an interesting idea where a small portion of the battery is LFP and used first for the day to day short commute, it having a better cycle life, and the SSB is used for the longer range days.

In theory, SSBs should offer improved battery metrics in all categories: capacity, charge rate, lifespan. But somehow no one can nail the lifespan improvement. To the point that it seems that everyone stopped reporting on this important metric.
It seems that materials needed to make solid state batteries possible are also causing shortened lifespans. If they put them in cars then they need to meet an 8 year warranty for 80% remaining capacity. But the lack of actual hard numbers is quite concerning.

Quote from: bob barrett on May 26, 2025, 01:05:41How much does this battery weigh? Is it less than Battery used in Tesla cars? The reason I ask this is that the heavy batteries in use in Tesla vehicles wear out tires very quickly. They are also extremely expensive. The tires in a Cyber truck cost $500 each.

That's in the article and in the title of this thread. It's "525 Wh/kg"

So, if you use the same weight of cells for both, a normal lithium cell of around 300 Wh/kg contains 57% of the energy of this 525 Wh/kg cell.

How much does this battery weigh? Is it less than Battery used in Tesla cars? The reason I ask this is that the heavy batteries in use in Tesla vehicles wear out tires very quickly. They are also extremely expensive. The tires in a Cyber truck cost $500 each.

An Indian Chemical Company, Ramcharan, received a patent ( on June 2023 ) for proof of concept of a solid-state battery from the abundant sodium-silicate.
Although it's energy-density is slightly less than other types of solid-state battery, it is the cheapest and the most environment-friendly ( 100 % recyclable ).
It is expected to reduce the cost of EVs by at least 20 % and will be commercially available in 2026  !

The Japanese Company, Maxell, have launched a sulfide based solid-state battery in 2023 but it is much more expensive than lithium-sulfer batteries, which have quintuple/5-times the energy-density of lithium-ion ones even though costing a bit less.

Apart from being safer, solid-state batteries are lighter, have more energy-density & lifespan and takes much less time to fully charge than lithium-ion ones.
Like sodium-ion, solid-state batteries can also be completely discharged to 0 % and then fully charged to 100 % without any adverse effects on the life of the battery.

If you follow the link to Gotion at the end of this article, you will see the second item is a "Quasi-solid-state" cell. Sounds like it is the same as semi solid state to me. Production line of 12 Gwh/Yr under construction, 60 times more than the 0.2 Gwh production for early-adoptors of fully solid state. So it looks like we are getting the semi-solid-state intermediate step, maybe a little later than hoped for, but that's engineering for you.

It's unfortunate that companies that are into solid state battery production that'll be released in 2028 or 2029 have skipped on manufacturing semi solid state batteries which could've already been released 2 years ago. While solid state batteries is all the hype for it's superiority over current lithium ion batteries, the fact is semi solid state batteries is the bridge and is also a significant upgrade over lithium ion batteries. That skipping the bridge probably delayed the eventual solid state battery release. In the meantime we're stuck on lithium ion batteries when we could've already had semi solid state batteries for 2 years now.