Controlled Growth of Nanostructured Biotemplates with Cobalt and Nitrogen Codoping as a Binderless Lithium-Ion Battery Anode

Tyler M. Huggins, Justin M. Whiteley, Corey T. Love, Kwangwon Lee, Se Hee Lee, Zhiyong Jason Ren, Justin C. Biffinger

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Biomass can serve as a sustainable template for the synthesis of carbon materials but is limited by the intrinsic properties of the precursor organism. In this study we demonstrate that the properties of a fungal biotemplate can be tuned during cultivation, establishing a new electrode manufacturing process and ultimately improving the electrochemical performance of the biomass-derived electrode. More specifically, the carbon/nitrogen ratio of Neurospora crassa mycelia mats was shifted by 5-fold while generating cobalt nanoparticles into the hyphal structure originating from macroconidia spores. This shift was achieved through nitrate limitation and equal molar concentrations of Mg2+ and Co2+ in the growth media. The resulting mycelia mat was converted via a high-temperature pyrolysis process (800 °C) to produce a freestanding cobalt and nitrogen codoped electrode material with no postmodification. Ultimately, nitrogen doping resulted in one of the highest recorded specific reversible capacity for a freestanding biomass-derived lithium-ion anode (400 mAh g-1 at C/10). We observed an additional improvement in capacity to 425 mAh g-1 with the incorporation of 3 wt % Co. Our results show how shaping the chemical characteristics of an electrode during the growth of the biotemplate allows for sustainable carbon-based material manufacturing from a living (self-assembled) material.

Original languageEnglish (US)
Pages (from-to)26868-26877
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number40
DOIs
StatePublished - Oct 12 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • biotemplate
  • cobalt
  • filamentous fungi
  • lithium
  • nitrate

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