Japan-based materials supplier JSR Corporation and 9th Street Investments, a venture firm linked to US-based advanced ceramics business Coorstek, helped US-based ionic liquids company Boulder Ionics Corporation raise $4.3m on Friday.
JSR and 9th Street were joined in the series A by venture firm Pangaea Ventures, which led the round, as well as venture firm CalCEF Clean Energy Angel Fund, and energy technology investor Protonic Capital.
Boulder Ionics previously raised $240,000 of a planned $260,000 round in February last year, according to this filing.
9th Street Investments, which describes itself as "born out of Coorstek" is an investor in Pangaea’s third fund.
Boulder Ionics said it would be the first US manufacturer targeting production of ionic liquids in industrial volumes. It added Ionic liquids were: "Safer and higher-performance replacements for the flammable organic solvents currently used in devices such as lithium-ion batteries".