Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 33, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802533
Keywords
energy storage; metal-organic frameworks; nonaqueous; porous membrane; redox flow batteries
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Funding
- National Science Foundation [NSF-CMMI-1537894]
- Camille Dreyfus Teacher-Scholar Award
- Sloan Research Fellowship
- Joint Funds of the National Natural Science Foundation of China [U1663223]
- National Key Research and Development Program of China [2016YFB0101203]
- Major National Scientific Instrument Development Project [21527812]
- China Scholarship Council [201706060167]
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Nonaqueous redox flow batteries (RFBs) have received significant research interest, but the lack of promising separators with advanced performance seriously hinders the development of nonaqueous RFBs. Here, a robust yet flexible membrane with enhanced selectivity for nonaqueous RFBs is designed via in situ synthesis of metal-organic frameworks (MOFs) in a porous polymeric membrane (Celgard) with a gradient density. The crossover of active species is mitigated by the reduced effective pore size while high ionic conductivity is maintained, which is attributed to the 3D channel structure of MOFs and their gradient distribution in the membrane. A Li/ferrocene RFB with the MOF-imbedded membrane delivers an excellent high-rate capability and enhanced cycling stability. The discharge capacity reaches as high as approximate to 94% of theoretical value at a current density of 4 mA cm(-2), and maintains 76% even at 12 mA cm(-2). Moreover, a much slower capacity decay rate is achieved (0.09% per cycle over 300 cycles) by using the composite membrane compared with the pristine Celgard membrane (0.24% per cycle). The demonstrated strategy provides new insight into rational design and fabrication of size-sieving separators for RFBs and can promote further research of MOFs' capability in energy storage.
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