What is it about?

Herein, we report the preparation of carbon electrode materials from low-cost cellulose nanofibers derived from an Australian native arid grass ‘spinifex’ (Triodia pungens).

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Why is it important?

The selection of an appropriate anode material is a critical factor in dictating the effectiveness of sodium-ion batteries as a cost-effect alternative to lithium-ion batteries. Hard carbon materials sourced from biomass offer the potential for a more sustainable anode material, while also addressing some of the thermodynamic issues associated with using traditional graphite anodes for sodium-ion batteries (NIBs). This nanocellulose derived carbon produced by a fast, low temperature carbonization protocol showed superior performance as an anode for NIBs with a specific capacity (386 mA h g−1 at 20 mA g−1) on par with that of the graphite based anode for lithium-ion batteries, and is one of the highest capacity carbon anodes reported for NIBs.

Perspectives

The excellent electrochemical performance is attributed to the large interlayer spacing of the carbon (∼0.39 nm). Superior cycling stability and high rate tolerance (326 mAh g−1 at 50 mA g−1 and 300 mAh g−1 at 100 mA g−1) suggest that hard carbons derived from sustainable precursors are promising for next-generation rechargeable batteries.

Dr Pratheep K Annamalai
University of Queensland

Read the Original

This page is a summary of: Spinifex nanocellulose derived hard carbon anodes for high-performance sodium-ion batteries, Sustainable Energy & Fuels, January 2017, Royal Society of Chemistry, DOI: 10.1039/c7se00169j.
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