Compact lithium-ion battery electrodes with lightweight reduced graphene oxide/poly(acrylic acid) current collectors

Joshua P. Pender, Han Xiao, Ziyue Dong, Kelsey A. Cavallaro, Jason A. Weeks, Adam Heller, Christopher J Ellison, C. Buddie Mullins

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)905-912
Number of pages8
JournalACS Applied Energy Materials
Volume2
Issue number1
DOIs
StatePublished - Jan 28 2019

Bibliographical note

Funding 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.

Keywords

  • 3D electrode
  • Aerogel
  • Lithium ion battery
  • Reduced graphene oxide
  • Volumetric energy density

How much support was provided by MRSEC?

  • Shared

Reporting period for MRSEC

  • Period 6

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