Effect of nanostructured carbon coatings on the electrochemical performance of Li1.4Ni0.5Mn0.5O2+x-based cathode materialsстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 18 апреля 2017 г.

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[1] Effect of nanostructured carbon coatings on the electrochemical performance of li1.4ni0.5mn0.5o2+x-based cathode materials / K. A. Kurilenko, O. A. Shlyakhtin, O. A. Brylev et al. // Beilstein journal of nanotechnology. — 2016. — Vol. 7. — P. 1960–1970. Nanocomposites of Li1.4Ni0.5Mn0.5O2+x and amorphous carbon were obtained by the pyrolysis of linear and cross-linked poly(vinyl alcohol) (PVA) in presence of Li1.4Ni0.5Mn0.5O2+x. In the case of linear PVA, the formation of nanostructured carbon coatings on Li1.4Ni0.5Mn0.5O2+x particles is observed, while for cross-linked PVA islands of mesoporous carbon are located on the boundaries of Li1.4Ni0.5Mn0.5O2+x particles. The presence of the carbon framework leads to a decrease of the polarization upon cycling and of the charge transfer resistance and to an increase in the apparent Li+ diffusion coefficient from 10−16 cm2·s−1(pure Li1.4Ni0.5Mn0.5O2+x) to 10−13 cm2·s−1. The nanosized carbon coatings also reduce the deep electrochemical degradation of Li1.4Ni0.5Mn0.5O2+x during electrochemical cycling. The nanocomposite obtained by the pyrolysis of linear PVA demonstrates higher values of the apparent lithium diffusion coefficient, a higher specific capacity and lower values of charge transfer resistance, which can be related to the more uniform carbon coatings and to the significant content of sp2 -hybridized carbon detected by XPS and by Raman spectroscopy. This is an Open Access article under the terms of the Creative Commons Attribution License http://www.beilstein-journals.org/bjnano/single/articleFullText.htm?publicId=2190-4286-7-187. [ DOI ]

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