Abstract
This work continues our research on integrated “layered-spinel” high-capacity cathode material Li[Ni1/3Mn2/3]O2 [30]. This material operated at potentials >4.6 V and demonstrated an advantageous cycling stability compared to high-voltage spinel LiNi0.5Mn1.5O4. In the present study, the Li[Ni1/3Mn2/3]O2 material was synthesized by a hydrothermal precipitation. The Rietveld analysis of XRD patterns indicated the presence of two layered structure phases: a monoclinic Li2MnO3 (about 58%) and a rhombohedral LiNiO2 (24%), along with spinel LiNi0.5Mn1.5O4 (17%) and rock salt Li0.2Mn0.2Ni0.5O (1%) phases. We demonstrate an interesting phenomenon of this electrode activation upon cycling from 100 to 220 mAh g−1 in the potential range of 2.3–4.9 V and stabilization followed by lowering the capacity to 89.5% of the maximal value after 100 cycles. It is suggested that the high capacity resulted from the activation of Li[Li1/3Mn2/3]O2 and participation of spinel component upon cycling to potential ≥4.5 V.
Original language | English |
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Pages (from-to) | 131-139 |
Number of pages | 9 |
Journal | Materials Science and Engineering: B |
Volume | 213 |
DOIs | |
State | Published - 1 Nov 2016 |
Bibliographical note
Publisher Copyright:© 2016 Elsevier B.V.
Funding
Partial support for this work was obtained from the Israel Science Foundation, ISF, in the framework of the INREP project.
Funders | Funder number |
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Israel Science Foundation |