I've never disagreed with your first sentence.
Improving tech:
"For the foreseeable future, the improvement of battery technology relies on modifications being made to already-existing lithium-ion technology. In fact, experts estimate that lithium-ions will continue to increase capacity by 6-7% annually for a number of years."
Finding a better battery is crucial to the green energy revolution. What does the future of battery technology look like, and what's in the pipeline?
www.visualcapitalist.com
Improving energy density:
"Li-ion-Manganese-Cobalt (NMC) batteries, which have a good balance of energy density and power and comprise much of the present growth in battery electric vehicles in the automotive sector."
Improved battery storage technologies - DNV
www.dnv.com
What is your evidence otherwise?