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Carbon-coated LiFePO4–carbon nanotube electrodes for high-rate Li-ion battery

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Abstract

Olivine LiFePO4 (LFP) is a promising cathode material for high-rated lithium-ion batteries. However, olivine faced a severe disadvantage of low conductivity and sluggish transportation of Li+ ions, which slows down the chemical reactions and thus the retention capacity of battery. Therefore, in this work, nanocomposite LiFePO4/carbon was synthesized by a hydrothermal route. A mixing of carbon nanotubes (CNTs) on the composite electrode was investigated to enhance the electrochemical performance of nanocomposite LiFePO4/C. The XRD pattern and XPS spectrum showed a high crystallite of olivine phase and a successful coating of carbon onto the surface of olivine. Electrochemical properties were evaluated by cyclic voltammetry (CV) and cyclability test. Lithium diffusion coefficients (DLi) were determined by the evolution of reduction peak on CV curves. An increase of DLi was observed with the increase of CNT amount in electrode composite. Practically, the composite electrode LFP/C/10%CNTs exhibited an excellent performance in cycling test and rate capability; a retention capacity of 98% was observed after 200 cycles.

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Funding

This research was funded by Vietnam National University Ho Chi Minh City (VNU-HCM) under the grant TX2017-18-01 and NV2018-18-01.

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Authors and Affiliations

  1. VNU-HCM Key Lab, Applied Physical Chemistry Laboratory (APCLAB), VNUHCM-University of Science, Ho Chi Minh City, Vietnam

    Le Thanh Nguyen Huynh, Thi Thuy Dung Tran, Hoang Hai Au Nguyen, Van Man Tran & My Loan Phung Le

  2. Faculty of Chemistry, HCMC University of Education, Ho Chi Minh City, Vietnam

    Thi Thu Trang Nguyen

  3. Department of Physical Chemistry, Faculty of Chemistry, VNUHCM-University of Science, Ho Chi Minh City, Vietnam

    Van Man Tran & My Loan Phung Le

  4. Department of Mechatronics Engineering, Shantou University, Shantou, Republic of China

    Akhil Grag

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  1. Le Thanh Nguyen Huynh
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  2. Thi Thuy Dung Tran
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Correspondence to My Loan Phung Le.

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Huynh, L.T.N., Tran, T.T.D., Nguyen, H.H.A. et al. Carbon-coated LiFePO4–carbon nanotube electrodes for high-rate Li-ion battery. J Solid State Electrochem 22, 2247–2254 (2018). https://doi.org/10.1007/s10008-018-3934-y

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  • DOI: https://doi.org/10.1007/s10008-018-3934-y

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