Dense graphene monolith oxygen cathodes for ultrahigh volumetric energy densities

Lei Qin, Dengyun Zhai, Wei Lv, Wei Wei, Wei Yu, Yu Lei, Wei Yang, Jiaqiang Huang, Shanshan Yao, Jiang Cui, Feiyu Kang, Jang Kyo Kim, Quan Hong Yang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

A convenient strategy is developed to prepare template-assisted, high density, porous graphene monolith (THPGM) cathodes with high densities for compact Li-O2 batteries. Graphene oxide is used as the primary building block to construct condensed carbon electrodes by self-assembly followed by capillary drying. SiO2 nanoparticles are incorporated onto the dense graphene monolith to function as sacrificial pore former. The bimodal pores of diameters ranging 1–6 and ∼ 40 nm created in the close-grained graphene monolith facilitate ion transport and oxygen diffusion, while providing sufficient space to accommodate the discharge products. The oxygen cathodes made from THPGM possess the advantageous features of high volumetric densities, a fully-developed porous structure and a robust architecture, resulting in unprecedented volumetric energy densities and excellent cyclic stability for Li-O2 batteries.

Original languageBritish English
Pages (from-to)134-139
Number of pages6
JournalEnergy Storage Materials
Volume9
DOIs
StatePublished - Oct 2017

Keywords

  • Graphene monolith
  • Lithium-oxygen battery
  • Volumetric energy density

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