Reduced-Graphene Oxide/Poly(acrylic acid) Aerogels as a Three-Dimensional Replacement for Metal-Foil Current Collectors in Lithium-Ion Batteries

Han Xiao, Joshua P. Pender, Mackenzie A. Meece-Rayle, J. Pedro De Souza, Kyle C. Klavetter, Heonjoo Ha, Jie Lin, Adam Heller, Christopher J. Ellison, C. Buddie Mullins

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report the synthesis and properties of a low-density (∼5 mg/cm3) and highly porous (99.6% void space) three-dimensional reduced graphene oxide (rGO)/poly(acrylic acid) (PAA) nanocomposite aerogel as the scaffold for cathode materials in lithium-ion batteries (LIBs). The rGO-PAA is both simple and starts from readily available graphite and PAA, thereby providing a scalable fabrication procedure. The scaffold can support as much as a 75 mg/cm2 loading of LiFePO4 (LFP) in a ∼430 μm thick layer, and the porosity of the aerogel is tunable by compression; the flexible aerogel can be compressed 30-fold (i.e., to as little as 3.3% of its initial volume) while retaining its mechanical integrity. Replacement of the Al foil by the rGO-PAA current collector of the slurry-cast LFP (1.45 ± 0.2 g/cm3 tap density) provides for exemplary mass loadings of 9 mgLFP/cm2 at 70 μm thickness and 1.4 g/cm3 density or 16 mgLFP/cm2 at 100 μm thickness and ∼1.6 g/cm3 density. When compared to Al foil, the distribution of LFP throughout the three-dimensional rGO-PAA framework doubles the effective LFP solution-contacted area at 9 mg/cm2 loading and increases it 2.5-fold at 16 mg/cm2 loading. Overall, the rGO-PAA current collector increases the volumetric capacity by increasing the effective electrode area without compromising the electrode density, which was compromised in past research where the effective electrode area has been increased by reducing the particle size.

Original languageEnglish (US)
Pages (from-to)22641-22651
Number of pages11
JournalACS Applied Materials and Interfaces
Volume9
Issue number27
DOIs
StatePublished - Jul 12 2017

Bibliographical note

Funding Information:
The authors gratefully acknowledge the Welch Foundation for support of this work (AH-grant F-1131, CJE-grant F-1709, CBM-grant F-1436). C.B.M. is also grateful to the National Science Foundation for support (grant# CBET-1603491).

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

  • 3D nanoarchitecture
  • aerogel
  • cathode
  • lithium-ion battery
  • nanocomposite
  • reduced graphene oxide

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