Effect of electronic state of ions on the electrochemical properties of layered cathode materials LiNi1-2x Co x Mn x O2 / Kosova N.V., Devyatkina E.T., Kaichev V.V., Kellerman D.G. // Russian Journal of Electrochemistry. - 2008. - V. 44, l. 5. - P. 543-549.

ISSN:

10231935

Type:

Article

Abstract:

The cathode materials of the composition LiNi1 - 2x Co x Mn x O2 (x = 0.1, 0.2. 0.33) synthesized from the Ni, Co, Mn mixed hydroxides and LiOH by using mechanical activation method are studied. It is shown that all synthesized compounds have layered structure described by the space group R-3m. With the decreasing of the nickel content the cell volume and the degree of structure disordering decrease. According to XPS data, the electronic main state of d-ions at the prepared samples' surfaces corresponds to Ni2+, Co3+, and Mn4+. An increase in the nickel content leads to the increase of the Ni2p 3/2 and Co2p 3/2 binding energy, which points to the change in the Me-O bond covalence. According to magnetic susceptibility measurements data, the nickel ions in LiNi0.6Co0.2Mn0.2O2 exist in the two oxidation states: Ni2+ and Ni3+. It is shown that this sample has the highest specific discharge capacity (∼ 170 mAh/g). The positions of redox peaks in the differential capacitance curves depend on the sample composition: with the increasing of nickel content they are shifted toward lower voltages. © 2008 MAIK Nauka.

Author keywords:

Cycling; Layered cathode materials; Lithium-ion battery; Magnetic susceptibility; Mechanical activation; XPS

Index keywords:

Cathodes; Electrochemical properties; Electronic states; Ions; Magnetic susceptibility; Cathode materials; Mechanical activation; Lithium compounds

DOI:

10.1134/S1023193508050066

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-44449101617&doi=10.1134%2fS1023193508050066&partnerID=40&md5=491890719db8451755218aa3d60edd90

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Affiliations	Institute of Solid State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk 630128, Russian Federation; Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, ul. akad. Lavrent'eva 5, Novosibirsk 630090, Russian Federation; Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg 620041, Russian Federation
Author Keywords	Cycling; Layered cathode materials; Lithium-ion battery; Magnetic susceptibility; Mechanical activation; XPS
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Correspondence Address	Kosova, N. V.; Institute of Solid State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk 630128, Russian Federation; email: kosova@solid.nsc.ru
CODEN	RJELE
Language of Original Document	English
Abbreviated Source Title	Russ J Electrochem
Source	Scopus