Reverse that, why don't other countries / companies try and steal their talent and IP? Is everyone resigned to think that China are undefeatable on the technology/manufacturing of these batteries?
It's not insurmountable for 'the West' to claw back some of that manufacturing, including high-tech items like batteries. It will take a large, long-time and very expensive effort, however. But talk is cheap, and largely 'the West' has drunken the neoliberalism kool-aid and is staring at quarterly shareholder value so little gets done.
Heck, some Western government are even in bed with the fossil fuel industry, desperately trying to hold back progress in order to claw a bit more profit out of the industry before the full force of the electric revolution hits.