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Spherical graphite produced from waste semi-coke with enhanced properties as an anode material for Li-ion batteries

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Abstract

“Turning waste into treasure” is of significance for sustainable development nowadays. Semi-coke in fine particles, abandoned as solid waste, has a less commercial value in the metallurgical industry and also causes environmental contamination. In this research, man-made graphite was prepared by the facile graphitization of semi-coke using silicon as the catalyst at 2300 °C. The obtained sample revealed spherical morphology and a high degree of graphitization with a small specific surface area. Furthermore, as the anode material for lithium-ion batteries, the sample displayed excellent lithium storage properties, delivering high delithiation capacity of 347.06 mA h g−1 at 0.05C, with the capacity even reaching 162.3 mA h g−1 at 3C. An excellent cycle life was displayed with capacity retention of 97.7% at 0.5C after 700 cycles. Generally, SG obtained can serve as an anode material in consideration of the following predominant advantages: (i) a raw material at a lower cost; (ii) the lower charge/discharge plateau voltage after graphitization at 2300 °C; (iii) an ultra-high rate performance and excellent cycle retention at a higher rate; (iv) retention of the spherical structure without retreatment. Also, the one-step heat treatment was easier to conduct and handle. The important advantages of the samples give us a clear direction towards large-scale production.

Graphical abstract: Spherical graphite produced from waste semi-coke with enhanced properties as an anode material for Li-ion batteries

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Publication details

The article was received on 06 Aug 2019, accepted on 25 Aug 2019 and first published on 26 Aug 2019


Article type: Paper
DOI: 10.1039/C9SE00606K
Sustainable Energy Fuels, 2019, Advance Article

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    Spherical graphite produced from waste semi-coke with enhanced properties as an anode material for Li-ion batteries

    M. Shi, Z. Tai, N. Li, K. Zou, Y. Chen, J. Sun and Y. Liu, Sustainable Energy Fuels, 2019, Advance Article , DOI: 10.1039/C9SE00606K

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