Study on Carbon-Coated LiMn_0.7Fe_0.3-xNi_xPO₄ (0 ≤ x ≤ 0.15) as Cathode Material for Lithium Ion Batteries

Abstract:

Phosphate-based cathode material, LMP, with olivine crystal structure is generally known as cathode material with low electronic conductivity. Therefore, these materials should be coated by conductive materials. In this study the synthesis of carbon-coated cathode material and dopant variations in cathode material to improve the working potential of the battery are observed. The process of synthesis is carried out through the conventional solid-state process. The starting materials, Li₂CO₃, MnO₂, Fe, Ni and NH₄H₂PO₄ in the powder form are mixed homogenously. The homogeneous mixture is further mixed with a solution of in water dissolved citric acid. This is then dried in oven for 24 hours. The dry mixture is then heated at a temperature of 320°C for 10 hours in a furnace with an inert atmosphere. The obtained powder is subsequently heated at 800°C for 8 hours in the furnace with flowing nitrogen gas. Phase of the powder obtained after the second heating was analyzed by XRD. Phase compositions were analyzed by Rietveld refinement method through a GSAS-software. Analysis of the microstructure and morphology are performed by SEM and BET. Cathode material performance is analyzed by using the Charge-Discharge battery analyzer. To perform Charge-Discharge analysis, cathode material is assembled into a half cell with metallic lithium as the counter electrode and 1 M LiPF6 dissolved in EC: DEC (1: 1 v / v) as the electrolyte.

• Periodical: Materials Science Forum (Volume 827)
• Pages: 140-145
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.827.140
• Online since: August 2015
• Authors: Joko Triwibowo*, Jan Setiawan, Raden Ibrahim Purawiardi, Bambang Prihandoko
• Keywords: Carbon Layer, LiMn_0.7Fe_0.3-xNi_xPO₄/C, Lithium Ion Battery, Solid-State Process

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