Materials Characterization and Charge-Discharge Profile of LiNi_1-XCo_xO₂ Cathodic Materials for Li-Ion Battery Application

Abstract:

Mixed lithium nickel cobalt oxides are advantageous over LiCoO₂ due to decrease in cobalt content in the material. It is also better than LiNiO₂ which is known to be difficult to synthesize and has poor electrochemical properties. Partial substitution of nickel in lithium nickel oxide with cobalt significantly improves its electrochemical properties. In this work, a combustion method was used for synthesis of LiNi_1-xCo_xO₂ (x= 0.1 and 0.2). The starting materials used are nitrates of the metals or transition metals. The precursors obtained are used for thermal studies. The precursors of LiNi_1-xCo_xO₂ were annealed at a temperature of 700 °C for 24h. X-ray diffraction (XRD) showed that the materials are pure. A composite cathode comprising of the cathode active material, binder and graphite was fabricated. Charge-discharge profiles of the materials with a voltage range of 0.5 V - 4.5 V vs Li/Li+ were obtained in order to study their electrochemical characteristics. The materials exhibited several voltage plateaus attributed to different electrochemical reactions.

• Periodical: Advanced Materials Research (Volume 545)
• Pages: 182-184
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.545.182
• Online since: July 2012
• Authors: Kelimah Elong, Rusdi Roshidah, Nurul Atikah Mohd Mokhtar, Azira Azahidi, Norlida Kamarulzaman
• Keywords: Cathode, LiNi_1-xCo_xO₂, Lithium Batteries

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