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Beyond Lithium Ion: ARPA-E Places Bets on Novel Energy Storage

The largest grant winner in energy storage, PolyPlus Battery, hopes to make a rechargeable lithium sulfur battery.

ARPA-E yesterday announced $130 million for 66 grants that have the potential for “transformational” change in energy. There are indeed some bold ideas on the list, such as wind turbines made of cloth and an underwater oscillating wing that gets energy from tides and rivers. In a shift this year, many projects are focused on using the plentiful natural gas in U.S. (See full list here and Kevin Bullis’ choice of stand-out projects here).

But like previous grant programs, energy storage is high on ARPA-E priority list, with about 20 projects being funding in this area, some as low as half a million dollars. The company which received the largest grant is PolyPlus Battery Company, which was also awarded $9 million this summer from the DOE’s Advanced Manufacturing Office. The ARPA-E money, which is for both PolyPlus Battery and Johnson Controls, is to develop an aqueous rechargeable lithium-sulfur battery which promises better energy density that today’s lithium ion batteries.

“The key word there is aqueous,” says research associate Thomas Conry at PolyPlus Battery. “Over the past 30 years, traditional non-aqueous Li-S batteries have been stuck in the lab, unable to transition to commercial reality. PolyPlus has had breakthroughs in the chemistry that solve many of the hurdles.”

The company is first developing a lithium seawater battery and rechargeable lithium air batteries. Key to all its planned batteries is a ceramic membrane that is impervious to water and allows lithium ions to move through. The manufacturing grant is focused on methods for producing that and other components at scale, Conry says. (See, Got a Battery Breakthrough? You Need Friends in Manufacturing.)

Another company, Vorbeck Materials, received a $1.5 million grant for a lithium sulfur battery that would improve the energy density and charge time of today’s batteries. Sharp Laboratories of America, meanwhile, got $2.9 million for a sodium ion battery it hopes will dramatically lower the cost of grid storage.
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