A 4 V-class metal-free organic lithium-ion battery gets closer to reality

https://phys.org/news/2022-04-v-class-metal-free-lithium-ion-battery-closer.html

"significant advancement towards high-voltage metal-free lithium-ion batteries that use a small organic molecule—croconic acid. The breakthrough moves us closer to realizing metal-free, high-energy, and inexpensive lithium-ion batteries... organic batteries exploit naturally abundant elements such as carbon, hydrogen, nitrogen, and oxygen. In addition, organic batteries have greater theoretical capacities than conventional lithium-ion batteries because their use of organic materials renders them lightweight"