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We report the fabrication and electrochemical performance of metal-foil free Li4Ti5O12 (LTO) and LiNi1/3Co1/3Mn1/3O2 (NCM) electrodes supported on conductive and porous reduced graphene oxide/poly(acrylic acid) (rGO-PAA) aerogels. The highly porous rGO-PAA (∼6 mg cm-3) enables slurry infiltration of LTO and NCM to form composite electrodes with tunable mass loadings (∼3-30 mg cm-2), and the resultant composites can withstand 100-fold compression (from 3.2 mm to ∼30-130 μm) to achieve electrode densities of 2-3 g cm-3. The adequate compressibility of the rGO-PAA coupled with removal of the conventional metal-foil weight and volume provides high volumetric energy densities of 1723 Wh L-1 for NCM and 625 Wh L-1 for LTO at low power density, representing a 25% increase in energy density over similar electrodes built with metal-foil current collectors. These metrics demonstrate the utility of the rGO-PAA current collector to reduce the weight and volume of lithium-ion electrodes without sacrificing energy density.
Bibliographical noteFunding Information:
The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. Funding The authors gratefully acknowledge the generous and continued support of the Welch Foundation through grants F-1131 (AH) and F-1436 (CBM), as well as the National Science Foundation via Grant CBET-1603491. The authors also thank Celgard for generously providing membrane separators. Parts of this work were carried out in the Characterization Facility at the University of Minnesota, which receives partial support from the National Science Foundation through the MRSEC program. Notes The authors declare no competing financial interest.
© 2018 American Chemical Society.
- 3D electrode
- Lithium ion battery
- Reduced graphene oxide
- Volumetric energy density