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Purification process of coal-based coke powder as anode for Li-ion batteries

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Abstract

A process of purification of coal-based coke powder as anode for Li-ion batteries was attempted. The process started with the treatment of coke powder with dilute hydrofluoric acid solution, followed by united-acid-leaching using sulfuric acid and hydrochloric acid. The effects of altering the hydrofluoric acid addition, hydrofluoric acid concentration, contact time, temperature and acid type were investigated. A minimum ash content of 0.35% was obtained when proper conditions were applied. The electrochemical performance of purified coke powder shows greatly improved electrochemical performance. The as-purified coke powder presented an initial reversible capacity of 257.4 mAh/g and a retention rate of 95% after 50 cycles. The proposed purification process paves a way to prepare a promising anode material with good performance with low cost of coke powder for Li-ion batteries.

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Authors and Affiliations

  1. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, China

    Juan Yang  (杨娟)

  2. School of Metalllurgy and Environment, Central South University, Changsha, 410083, China

    Juan Yang  (杨娟), Lu-lu Ma  (马路路) & Xiang-yang Zhou  (周向阳)

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  1. Juan Yang  (杨娟)
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  2. Lu-lu Ma  (马路路)
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  3. Xiang-yang Zhou  (周向阳)
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Corresponding author

Correspondence to Juan Yang  (杨娟).

Additional information

Foundation item: Projects(51274240, 51204209) supported by the National Natural Science Foundation of China; Project(2012M521545) supported by the National Postdoctoral Science Foundation of China

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Yang, J., Ma, Ll. & Zhou, Xy. Purification process of coal-based coke powder as anode for Li-ion batteries. J. Cent. South Univ. 21, 857–861 (2014). https://doi.org/10.1007/s11771-014-2010-8

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  • DOI: https://doi.org/10.1007/s11771-014-2010-8

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