A High-Current, Stable Nonaqueous Organic Redox Flow Battery

Journal Article · Fri Oct 14 00:00:00 EDT 2016 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.6b00255· OSTI ID:1340872

Wei, Xiaoliang; Duan, Wentao; Huang, Jinhua; Zhang, Lu; Li, Bin; Reed, David; Xu, Wu; Sprenkle, Vincent; Wang, Wei

Nonaqueous redox flow batteries are promising in pursuit of high-energy storage systems owing to the broad voltage window, but currently are facing key challenges such as poor cycling stability and lack of suitable membranes. Here we report a new nonaqueous all-organic flow chemistry that demonstrates an outstanding cell cycling stability primarily because of high chemical persistency of the organic radical redox species and their good compatibility with the supporting electrolyte. A feasibility study shows that Daramic® and Celgard® porous separators can lead to high cell conductivity in flow cells thus producing remarkable cell efficiency and material utilization even at high current operations. This result suggests that the thickness and pore size are the key performance-determining factors for porous separators. With the greatly improved flow cell performance, this new flow system largely addresses the above mentioned challenges and the findings may greatly expedite the development of durable nonaqueous flow batteries.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Electricity (OE)
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1340872
• Report Number(s): PNNL-SA-112127; TE1400000
• Journal Information: ACS Energy Letters, Vol. 1, Issue 4; ISSN 2380-8195
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English