The Lithium-Thallium batteries written about in the story are fiction. The characteristics of batteries like those written about in the story are the quest of multiple companies, universities, and research labs around the world, at least according to my authorial research. Some places have made progress only what they have been able to develop are yet cost prohibitive to bring to market. Someday - soon - however, researchers will overcome the issues preventing them from bringing them to market as cost competitive. The past is prolog to the future.
Several of you have written that 'my' batteries are too pie in the sky. True, but someone will do what I've written about, probably by 2030, AND it is that timeframe that I have chosen to at least write about that technology in my fictional story.
The technology in this and many areas is exponentially exploding as more and more researchers add their focus to the subject. The batteries of the future will not resemble those we know today.