Effect of Dopants on the Functional Properties of Lithium-Rich Cathode Materials for Lithium-Ion Batteries

A comparative study was made of the effect of the dopant nature on the electrochemical performance of lithium-rich oxides of the general composition 0.5Li 2 MnO 3 ⋅0.5LiMn 0.33 Ni 0.33 Co 0.31 M 0.02 O 2 (M = Mg, Cr, Zr). The obtained materials were tested as cathodes in CR2032 coin-type cells versu...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2021-05, Vol.66 (5), p.777-788
Main Authors: Pechen, L. S., Makhonina, E. V., Medvedeva, A. E., Rumyantsev, A. M., Koshtyal, Yu. M., Politov, Yu. A., Goloveshkin, A. S., Eremenko, I. L.
Format: Article
Language:English
Subjects:
Cathodes
Chemistry
Chemistry and Materials Science
Comparative studies
Dopants
Electrochemical analysis
Electrode materials
Inorganic Chemistry
Inorganic Materials and Nanomaterials
Lithium
Lithium-ion batteries
Magnesium
Phase transitions
Rechargeable batteries
Transition metals
Zirconium
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Summary:A comparative study was made of the effect of the dopant nature on the electrochemical performance of lithium-rich oxides of the general composition 0.5Li 2 MnO 3 ⋅0.5LiMn 0.33 Ni 0.33 Co 0.31 M 0.02 O 2 (M = Mg, Cr, Zr). The obtained materials were tested as cathodes in CR2032 coin-type cells versus lithium metal. The results of the study attested to the fact that the main role in the degradation of the material is played by the migration of transition metals, which depends on the dopant-oxygen binding energy. The doping with magnesium suppresses the phase transition, thus stabilizing the oxide structure. By the 110th cycle in the voltage range of 2.5–4.8 V at a current of 100 mA/g, the sample doped with magnesium retains 10% more specific energy than the initial oxide.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023621050144