If by "better", you mean more performance in the same package?
Doubtful, the technology is pretty good and going to be hard to improve on it.
But, better (higher capacity) batteries are in the pipeline in the research labs. just not on the shelf for us to buy today.
More capacity comes at the expense of "thicker packaging" in all dimensions.
Surfing will find lots of claims and pricing all over the charts.
Be careful, read a lot. there are a few skunks in the woodwork, and there are a few that have good reputations.
Anker seems to be a good one. I've not surfed enough to know who is selling what, where.....
I just read the technical newsletters.... a lot of them.