The whole VRB thing is a bit of a web. At the centre seems to be United Energy Tech. (UET) who together with an American Electricity Producer (PENN) developed the denser electrolyte.
There are commercial understandings/agreements between UET, Sumitomo, and Rongke power.
Any one of the Three nicest names you could hope to hear next to EMC.
In my opinion of course
Ann: TNG:TNG team up with Sumitomo and EMC for Vanadium batteries, page-6
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