Moore's law doesn't apply to batteries though
Lithium was chosen because it has a high electrode potential:
Standard electrode potential - Wikipedia
It also has very high electropositivity (low electronegativity):
View attachment 178725
You've basically got Lithium, Sodium and
Potassium there as the best elements; the elements with the highest electropositivity, all of which have been experimented with. The chemistry and physics of batteries are extremely mature. Yes, we'll get incremental improvements as new techniques and compounds are developed, but it's nothing like Moore's law.
There's no battery equivalent of evolving lithography where the incremental reduction in transistor and die size exponentially increased the number of transistors and subsequently the capability.
To put that into perspective, if battery technology were to scale with Moore's law, a battery equivalent of a 486 DX4/100 (1994) would have to match the performance of an Intel Core i9-13900KS 6GHz CPU today, a 60x increase in just clock speed alone.
The commercial lithium-ion battery started production in 1991 by Sony, Li-Po was commercialized in 1994, the same year as the DX4. They were around 110-125Wh/kg. The best example from that linked article was 500Wh/kg, a 4x increase.
You could buy a Pentium II 400 (the 4x increase) in 1998, just 4 years later.