mnvoronin t1_izzn9z6 wrote on December 13, 2022 at 12:39 AM

Reply to comment by OptimalConcept143 in Scientists have developed a solid-state battery material that doesn't diminish after repeated charge cycles, potentially offering a durable alternative to the lithium-ion batteries used in electric vehicles by unswsydney

If you read the linked article, you will find that the battery in question is using lithium ions. And the researchers claim 300 mAh/g energy density, which is pretty much up there.

OptimalConcept143 t1_izznulk wrote on December 13, 2022 at 12:43 AM

They listed it in mass density because they don't want you to notice how much greater the volume density is. Solids at human scales will pretty much always be less dense in volume than liquids.

mnvoronin t1_izzqgh3 wrote on December 13, 2022 at 1:03 AM

Huh? It's exactly the opposite.

Liquids typically have a density between 0.7 to 2 kg/l (one of the densest electrolytes used in batteries, sulphuric acid, is 1.84). Common solids go from 1 to 8 kg/l (iron is 7.8) and some even higher. For example, lithium titanate used in the battery is about 3.4 kg/l.