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Title: High Areal Capacity Si/LiCoO2 Batteries from Electrospun Composite Fiber Mats

Journal Article · · ChemSusChem
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  1. Vanderbilt Univ., Nashville, TN (United States). Dept. of Chemical and Biomolecular Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division

Here, freestanding nanofiber mat Li-ion battery anodes containing Si nanoparticles, carbon black, and poly(acrylic acid) (Si/C/PAA) are prepared using electrospinning. The mats are compacted to a high fiber volume fraction (~0.85), and interfiber contacts are welded by exposing the mat to methanol vapor. A compacted+welded fiber mat anode containing 40 wt % Si exhibits high capacities of 1,484 mA h g-1 (3,500 mA h g$$-1\atop{Si}$$) at 0.1 C and 489 mAh g-1 at 1 C and good cycling stability (e.g., 73% capacity retention over 50 cycles). Post-mortem analysis of the fiber mats shows that the overall electrode structure is preserved during cycling. Whereas many nanostructured Si anodes are hindered by their low active material loadings and densities, thick, densely packed Si/C/PAA fiber mat anodes reported here have high areal and volumetric capacities (e.g., 4.5 mA h cm-2 and 750 mA h cm-3, respectively). A full cell containing an electrospun Si/C/PAA anode and electrospun LiCoO2-based cathode has a high specific energy density of 270 Wh kg-1. The excellent performance of the electrospun Si/C/PAA fiber mat anodes is attributed to the: (i) PAA binder which interacts with the SiOx surface of Si nanoparticles and (ii) high material loading, high fiber volume fraction, and welded interfiber contacts of the electrospun mats

Research Organization:
Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); Celgard LLC, Charlotte, NC (United States); Arkema Inc, Colombes (France)
Grant/Contract Number:
EE0007215; AC05-00OR22725; AC02-05CH11231
OSTI ID:
1350938
Alternate ID(s):
OSTI ID: 1401055; OSTI ID: 1435795; OSTI ID: 1476452; OSTI ID: 1524166
Journal Information:
ChemSusChem, Vol. 10, Issue 8; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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