Pure Lithium Battery

A recent breakthrough in battery technology could triple energy density while reducing weight and cost. The key is lithium – not only in the electrolyte (like today’s batteries) but in the anode as well. The problem is preventing the lithium anode from expanding during charging and using up the electrolyte over time.

The solution appears to be a microscopic layer of nanospheres built like a honeycomb. When placed over the unstable lithium, the flexible, non-reactive film protects the anode and improves efficiency. While unprotected lithium anodes exhibit about 96 percent efficiency, the version with the new film approaches 99.6 percent. However, the goal, in order to become commercially viable, is 99.9 percent, which the developers expect will be achievable in about two years.