Improved electrochemical performance of SiO 2 -coated Li-rich layered oxides-Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2
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Improved electrochemical performance of SiO2-coated Li-rich layered oxides-Li1.2Ni0.13Mn0.54Co0.13O2 Jeffin James Abraham1, Umair Nisar1, Haya Monawwar2, Aisha Abdul Quddus3, R. A. Shakoor1,* , Mohamed I. Saleh1, Ramazan Kahraman3, Siham Al-Qaradawi4, and Amina S. Aljaber4 1
Center for Advanced Materials (CAM), Qatar University, Doha, Qatar Department of Electrical Engineering, College of Engineering, Qatar University, Doha, Qatar 3 Department of Chemical Engineering, College of Engineering, Qatar University, Doha, Qatar 4 Department of Chemistry & Earth Sciences, College of Arts and Science, Qatar University, P.O. Box 2713, Doha, Qatar 2
Received: 18 May 2020
ABSTRACT
Accepted: 11 September 2020
Lithium-rich layered oxides (LLOs) such as Li1.2Ni0.13Mn0.54Co0.13O2 are suitable cathode materials for future lithium-ion batteries (LIBs). Despite some salient advantages, like low cost, ease of fabrication, high capacity, and higher operating voltage, these materials suffer from low cyclic stability and poor capacity retention. Several different techniques have been proposed to address the limitations associated with LLOs. Herein, we report the surface modification of Li1.2Ni0.13Mn0.54Co0.13O2 by utilizing cheap and readily available silica (SiO2) to improve its electrochemical performance. Towards this direction, Li1.2Ni0.13Mn0.54Co0.13O2 was synthesized utilizing a sol–gel process and coated with SiO2 (SiO2 = 1.0 wt%, 1.5 wt%, and 2.0 wt%) employing dry ball milling technique. XRD, SEM, TEM, elemental mapping and XPS characterization techniques confirm the formation of phase pure materials and presence of SiO2 coating layer on the surface of Li1.2Ni0.13Mn0.54Co0.13O2 particles. The electrochemical measurements indicate that the SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2 materials show improved electrochemical performance in terms of capacity retention and cyclability when compared to the uncoated material. This improvement in electrochemical performance can be related to the prevention of electrolyte decomposition when in direct contact with the surface of charged Li1.2Ni0.13Mn0.54Co0.13O2 cathode material. The SiO2 coating thus prevents the unwanted side reactions between cathode material and the electrolyte. 1.0 wt% SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2shows the best electrochemical performance in terms of rate capability and capacity retention.
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The Author(s) 2020
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https://doi.org/10.1007/s10854-020-04481-6
J Mater Sci: Mater Electron
1 Introduction The energy storage requirements have been stringent throughout the years, and Li-ion batteries (LIBs) are an ideal solution that has been leading this field owing to their higher energy and power density [1–4]. With environmental concerns, there have been increasing interest in renewable energy sources [3]. The energy generated from various renewable energy sources must be stored into energy storage devices which could supply them instantly when needed [1]. In this regard, LIBs are considered the most attractive
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