LiCoO2-Based Fiber Cathodes for Electrospun Full Cell Li-ion Batteries
- Vanderbilt Univ., Nashville, TN (United States). Dept. of Chemical and Biomolecular Engineering
Here, particle/polymer electrospinning was used to prepare fiber mat cathodes containing LiCoO2 nanoparticles, carbon powder, and poly(vinylidene fluoride) for Li-ion batteries. The fibers had a high LiCoO2 particle content (70 wt%) which allowed for a high gravimetric capacity of 90 mAh g-1 (corresponding to 128 mAh g$$-1\atop{LiCoO2}$$) at 0.1C (1C = 274 mAh g$$-1\atop{LiCoO2}$$). Cathode performance was stable in a half cell with 78% capacity retention over 200 cycles at 0.5C. Unlike previous work on electrospun LiCoO2 nanofibers prepared using sol-gel chemistry and high temperature processing, the particle/polymer fiber mat cathodes reported here were made thick with a high fiber volume fraction for high areal and volumetric capacities at fast charge/discharge rates (e.g., 0.81 mAh cm-2 and 62 mAh cm-3 at 2C) which were much greater than that of a slurry cast cathode of the same composition (0.004 mAh cm-2 and 0.30 mAh cm-3 at 2C). Full cells containing a LiCoO2/C/PVDF fiber mat cathode and C/PVDF fiber mat anode were also prepared and characterized. These electrospun batteries exhibited a high energy density of 144 Wh kg-1 at 0.1C and an areal capacity of 1.03 mAh cm-2 at 1C. The excellent performance of the electrospun particle/polymer cathodes and anodes is attributed to electrolyte penetration throughout the 3D fiber electrode mats, a large electrode/electrolyte interfacial area, and short Li+ transport pathways between the electrolyte and active material nanoparticles in the radial fiber direction.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); Arkema Inc., Colombes (France); Celgard LLC, Charlotte, NC (United States); National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- EE0007215; EPS 1004083
- OSTI ID:
- 1435796
- Alternate ID(s):
- OSTI ID: 1432895; OSTI ID: 1524167
- Journal Information:
- Electrochimica Acta, Vol. 214, Issue C; ISSN 0013-4686
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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