Статья
2018

The Effect of Particle Size on the Processes of Charging and Discharging of the LiFe0.97Ni0.03PO4/C/Ag Cathode Material

D. Yu. Gryzlov D. Yu. Gryzlov , S. A. Novikova S. A. Novikova , T. L. Kulova T. L. Kulova , A. M. Skundin A. M. Skundin , A. B. Yaroslavtsev A. B. Yaroslavtsev
Российский электрохимический журнал
https://doi.org/10.1134/S1023193518050038
Abstract / Full Text
Gryzlov, D.Y., Novikova, S.A., Kulova, T.L. et al. The Effect of Particle Size on the Processes of Charging and Discharging of the LiFe0.97Ni0.03PO4/C/Ag Cathode Material. Russ J Electrochem 54, 442–450 (2018). https://doi.org/10.1134/S1023193518050038

Olivine-structured LiFe0.97Ni0.03PO4/C/Ag nanomaterials of varying dispersibility are prepared by using sol–gel synthesis with subsequent milling. The materials are certified using X-ray diffraction analysis, scanning electron microscopy, low-temperature nitrogen adsorption, and electrochemical testing under the lithium-ion battery operating conditions. The LiFe0.97Ni0.03PO4/C/Ag cathode material primary particles’ size was shown to decrease, under the intensifying of ball-milling, from 42 to 31 nm, while the material’s specific surface area increased from 48 to 65 m2/g. The discharge capacity, under slow charging–discharging (C/8), approached a theoretical one for all materials under study. It was found that under fast charging–discharging (6 C and 30 C) the discharge capacity is inversely proportional to the particles’ mean size. The discharge capacity under the 6 С current came to 75, 94, 97, and 106 mA h/g for the initial material and that milled at a rotation velocity of 300, 500, and 700 rpm, respectively. An increase in the lithium diffusion coefficient upon the samples’ intense milling is noted.

Author information

  • Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia

    D. Yu. Gryzlov, T. L. Kulova & A. M. Skundin

  • Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    S. A. Novikova & A. B. Yaroslavtsev

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