Synthesis and electrochemical characteristics of almost stoichiometric nanosized cathode materials Li_1-xNi_1+xO₂ with a combination of sol-gel and solid-phase methods

Abstract

We have found approaches to the synthesis of cheap near-stoichiometric lithium nickelate (LiNiO₂). The resulting phases have been identified by X-ray phase analysis. Obtained materials have been studied by spectrometric method; electron microscopy; BET method; impedance spectroscopy. A technological scheme has been developed, the optimal conditions for the combined synthesis of lithium nickelate close to the stoichiometric composition Li_0.98Ni_1.02О₂ have been determined. We have proved that nanosized samples with a well-developed surface form during such a synthesis. We have determined that the electrochemical characteristics of the samples correspond to those of lithium nickelate used in commercial electrochemical cells.

Keywords:

• Lithium-ion batteries
• sol-gel
• solid-state synthesis
• electrochemical properties
• lithium nickelate

Acknowledgments

Authors appreciate help with preparation of the manuscript from Andrey Novikov, Anna Shirokaya, Vasiliy Semushin, Anastasiya Kniazeva from Tananaev Institute of Chemistry (ICT RAS).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was funded by the Ministry of Science and Higher Education Russian Federation scientific topic 0186-2022-0002 (registration # FMEZ-2022-0016) and 0186-2022-0009 (registration # FMEZ 2022-0015).