The first article literally says lithium batters aren't meeting...

The first article literally says lithium batters aren't meeting china's demand so they're looking for alternatives to make up for the difference.
Not stating a replacement.

Other issues are that storing hydrogen as a gas is expensive and energy intensive, sometimes as much as half the energy it contains, and even more so when it is stored as a liquid at cryogenic temperatures. In addition, it is highly flammable, tends to escape containment and reacts with metals in a way than renders them more brittle and prone to breakage. Eventually, although it is everywhere around us, hydrogen is hard, dangerous and expensive to produce, store and transport.