found this on asia.nikkei.com, aug 2017
https://asia.nikkei.com/Business/GS-Yua ... -car-range
OSAKA -- Japan's GS Yuasa will begin mass producing as early as 2020 lithium-ion batteries that double the driving range of small electric vehicles.
Lithium Energy Japan, a joint venture with trading house Mitsubishi Corp. and carmaker Mitsubishi Motors, will develop the cells, which will be produced at its plant in Shiga Prefecture and supplied to automakers in Japan and Europe.
Mitsubishi Motors' i-MiEV compact, for instance, has a scope of around 170km per charge. The new battery would extend the range to some 340km, comparable to that of a large electric vehicle which can hold a bigger battery, and close to the limit of a gasoline-fueled car with a full tank.