7 ms·

I remember a few years ago reading an article about a breakthrough in Lithium Metal batteries, as opposed to Lithium Ion. Supposedly have 2x the power density a

I remember a few years ago reading an article about a breakthrough in Lithium Metal batteries, as opposed to Lithium Ion. Supposedly have 2x the power density at half the size, and don't burst into flames when punctured. Anyone else remember that? I want those batteries. Apparently the main issue is that they don't last as long as Li-Ion.

rootusrootus 5y ago
The big competitors to lithium ion right now are LFP (lithium iron phosphate) and LTO (lithium titanate oxide). Neither have quite the power density of current lithium ion cells, but they're not that far off. LFP is quite popular right now for home storage and RVs. It is not nearly as prone to fire as lithium ion. LTO is even safer yet, it usually doesn't even pop the case if you abuse it to the point of destruction. LFP is improving density so it may be viable soon for EVs (in the US; in China they already use LFP), which manufacturers would love. Making the news for fires is really undesirable.
- Baeocystin 5y ago
  LFP have been popular as drop-in replacements for 12V batteries in motorcycles for years now, too, FWIW. Their cell voltage and resistance to charging damage make them excellent replacements. Their only real deficit is in the cold.
- mmazing 5y ago
  I might be wrong but it looks like neither of those are classified as a Lithium Metal Battery and are still a form of Lithium Ion. https://en.wikipedia.org/wiki/Lithium_metal_battery https://en.wikipedia.org/wiki/Lithium_metal_battery vs https://en.wikipedia.org/wiki/Lithium-titanate_battery https://en.wikipedia.org/wiki/Lithium-titanate_battery https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery and here's an article about using pure lithium metal as the anode https://arstechnica.com/cars/2021/11/lithium-metal-hybrid-battery-promises-lighter-longer-range-evs-by-2025/ https://arstechnica.com/cars/2021/11/lithium-metal-hybrid-ba... You seem to be well informed, is this just hype?
- WhisperingShiba 5y ago
  From what you know off the cuff, do LFP or LTO batteries have advantages in number of cycles or discharge depth? Both of those being even marginally higher would make them superior for home batteries, since the power density wouldn't matter nearly as much. E: Wikipedia says low cost, less rare earth metals and longer lifetime. Sounds like a big technology.

rootusrootus 5y ago

The big competitors to lithium ion right now are LFP (lithium iron phosphate) and LTO (lithium titanate oxide). Neither have quite the power density of current lithium ion cells, but they're not that far off. LFP is quite popular right now for home storage and RVs. It is not nearly as prone to fire as lithium ion. LTO is even safer yet, it usually doesn't even pop the case if you abuse it to the point of destruction. LFP is improving density so it may be viable soon for EVs (in the US; in China they already use LFP), which manufacturers would love. Making the news for fires is really undesirable.

Baeocystin 5y ago
LFP have been popular as drop-in replacements for 12V batteries in motorcycles for years now, too, FWIW. Their cell voltage and resistance to charging damage make them excellent replacements. Their only real deficit is in the cold.
mmazing 5y ago
I might be wrong but it looks like neither of those are classified as a Lithium Metal Battery and are still a form of Lithium Ion. https://en.wikipedia.org/wiki/Lithium_metal_battery https://en.wikipedia.org/wiki/Lithium_metal_battery vs https://en.wikipedia.org/wiki/Lithium-titanate_battery https://en.wikipedia.org/wiki/Lithium-titanate_battery https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery and here's an article about using pure lithium metal as the anode https://arstechnica.com/cars/2021/11/lithium-metal-hybrid-battery-promises-lighter-longer-range-evs-by-2025/ https://arstechnica.com/cars/2021/11/lithium-metal-hybrid-ba... You seem to be well informed, is this just hype?
WhisperingShiba 5y ago
From what you know off the cuff, do LFP or LTO batteries have advantages in number of cycles or discharge depth? Both of those being even marginally higher would make them superior for home batteries, since the power density wouldn't matter nearly as much. E: Wikipedia says low cost, less rare earth metals and longer lifetime. Sounds like a big technology.