It may possible for TNG to have a foot in both lithium and vanadium energy storage camps if a viable way can be found for the titanium produced by the TIVAN Process be adapted to lithium titanate battery technology (LTO)
The link shows how this Australian company has overcome some of the deficiencies of LTO technology to produce a battery that can compete with Li ion batteries. It claims to have a developed an LTO battery that will last 20 years and can be used for home energy storage as well as for electric cars and buses.
