Synthesis and properties of LiNiO2 close to stoichiometric composition obtained by combined synthesis method

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Abstract

This study presents the synthesis and characterisation of lithium nickelate LiNiO₂ with near-stoichiometric composition prepared by a combined method. LiNiO2 exhibits high electrochemical properties including a theoretical capacity of 250–270 mA/g, making it a promising cathode material for lithium-ion batteries as an alternative to LiCoO2. However, the commercial use of LiNiO₂ is limited by the difficulty in achieving stoichiometric composition and the high cost of conventional synthesis methods. Using X-ray phase analysis and spectrometry, we identified the phases formed and determined their chemical composition. Electron microscopy and Brunauer-Emmett-Teller (BET) techniques were used to investigate the structure and morphology. The developed process scheme led to the preparation of lithium nickelate with the composition Li(0.98)Ni(1.02)O₂, providing the formation of nanoscale samples with high specific surface area and improved electrochemical performance. These results emphasise the potential of LiNiO2 as a competitive cathode material for lithium-ion batteries.

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About the authors

R. I. Korneykov

Sakhalin State University; Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Author for correspondence.
Email: v.efremov@ksc.ru

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Russian Federation, Yuzhno-Sakhalinsk, 693000; Apatity, 184209

V. V. Efremov

Sakhalin State University; Institute of Industrial Problems of the North Ecology

Email: v.efremov@ksc.ru
Russian Federation, Yuzhno-Sakhalinsk, 693000; Apatity, 184209

S. V. Aksenova

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Email: v.efremov@ksc.ru

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Russian Federation, Apatity, 184209

K. A. Kesarev

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Email: v.efremov@ksc.ru

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Russian Federation, Apatity, 184209

O. I. Akhmetov

Sakhalin State University

Email: v.efremov@ksc.ru
Russian Federation, Yuzhno-Sakhalinsk, 693000

O. B. Shcherbina

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Email: v.efremov@ksc.ru

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Russian Federation, Apatity, 184209

I. R. Elyzarova

Institute of Industrial Problems of the North Ecology

Email: v.efremov@ksc.ru
Russian Federation, Apatity, 184209

I. G. Tananaev

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Email: v.efremov@ksc.ru

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials

Russian Federation, Apatity, 184209

O. O. Shichalin

Sakhalin State University

Email: v.efremov@ksc.ru
Russian Federation, Yuzhno-Sakhalinsk, 693000

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Supplementary files

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2. Fig. 1. X-ray diffraction patterns of samples: a – Li0.25Ni1.75O2, b – Li0.35Ni1.65O2, c – Li0.64Ni1.36O2, d – Li0.98Ni1.02O2, d – Li0.524Ni1.476O2, e – Li0.79Ni1.21O2, g – Li0.92Ni1.08O2, h – Li0.55Ni1.45O2, i – Li0.68Ni1.32O2, k – Li0.75Ni1.25O2.

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3. Fig. 2. IR spectrum of the sample with the composition Li0.98Ni1.02O2.

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4. Fig. 3. Schematic flow chart for obtaining lithium nickelate

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5. Fig. 4. SEM images of samples, Li0.79Ni1.21O2 (a) and Li0.98Ni1.02O2 (b).

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6. Fig. 5. Complex impedance diagram of Li0.79Ni1.21O2.

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7. Fig. 6. Complex impedance diagram of Li0.98Ni1.02O2.

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8. Fig. 7. Equivalent equivalent circuit.

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