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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. GryzlovD. Yu. Gryzlov, S. A. NovikovaS. A. Novikova, T. L. KulovaT. L. Kulova, A. M. SkundinA. M. Skundin, A. B. YaroslavtsevA. B. Yaroslavtsev
Российский электрохимический журнал
https://doi.org/10.1134/S1023193518050038
Abstract / Full Text

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, RussiaD. Yu. Gryzlov, T. L. Kulova & A. M. Skundin
  • Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, RussiaS. A. Novikova & A. B. Yaroslavtsev
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