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Issue 34, 2020, Issue in Progress

Peat-derived hard carbon electrodes with superior capacity for sodium-ion batteries

Author affiliations

Abstract

Herein we demonstrate how peat, abundant and cheap biomass, can be successfully used as a precursor to synthesize peat-derived hard carbons (PDCs), applicable as electrode materials for sodium-ion batteries (SIB). The PDCs were obtained by pre-pyrolysing peat at 300–800 °C, removing impurities with base–acid solution treatment and thereafter post-pyrolysing the materials at temperatures (T) from 1000 to 1500 °C. By modification of pre- and post-pyrolysis temperatures we obtained hard carbons with low surface areas, optimal carbonization degree and high electrochemical Na+ storage capacity in SIB half-cells. The best results were obtained when pre-pyrolysing peat at 450 °C, washing out the impurities with KOH and HCl solutions and then post-pyrolysing the obtained carbon-rich material at 1400 °C. All hard carbons were electrochemically characterized in half-cells (vs. Na/Na+) and capacities as high as 350 mA h g−1 at 1.5 V and 250 mA h g−1 in the plateau region (E < 0.2 V) were achieved at charging current density of 25 mA g−1 with an initial coulombic efficiency of 80%.

Graphical abstract: Peat-derived hard carbon electrodes with superior capacity for sodium-ion batteries

Supplementary files

Article information


Submitted
09 Apr 2020
Accepted
20 May 2020
First published
27 May 2020

This article is Open Access

RSC Adv., 2020,10, 20145-20154
Article type
Paper

Peat-derived hard carbon electrodes with superior capacity for sodium-ion batteries

A. Adamson, R. Väli, M. Paalo, J. Aruväli, M. Koppel, R. Palm, E. Härk, J. Nerut, T. Romann, E. Lust and A. Jänes, RSC Adv., 2020, 10, 20145 DOI: 10.1039/D0RA03212C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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