Electrochemical Title Performance of LiMn₂O₄ Synthesized by Flameless Solution Combustion with Acetate System

Abstract:

LiMn₂O₄ was synthesized by flameless solution combustion at 600°C for 3 hours (h). The influence of HNO₃ on the morphologies, crystal structure and electrochemical performances of the material was investigated. The results show that the main phase of all synthesized products is LiMn₂O₄, and the impurities are Mn₂O₃ or Mn₃O₄ depending on the concentration of HNO₃ (C_HNO3). While C_HNO3=0 and 15 mol L^-1, the impurity was Mn₂O₃, when the concentrations of HNO₃ from 3 to 9 mol L^-1, the impurity was Mn₃O₄; at C_HNO3=12 mol L^-1, the synthesized product was single phase; C_HNO3≤12 mol L^-1, with the increase of C_HNO3, particles size grew from 70-130 nm to 140-500 nm, however, C_HNO3 is up to 15 mol L^-1, particles become small (70-140 nm); the single phase of LiMn₂O₄ obtained the maximum first discharge capacity (119.7 mAh g^-1) at C_HNO3=12 mol L^-1, but its retention rate was undesirable, while C_HNO3=15 mol L^-1, the cycling performance of the product was the optimum with first discharge capacity of 118.5 mAh g^-1 and capacity retention of 90.9 % after 40 cycles at 0.2 C.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 598-601
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.598
• Online since: June 2014
• Authors: Lei Zhong*, Ming Wu Xiang, Bin Li, Zhi Fang Zhang, Chang Wei Su, Hong Li Bai, Jun Ming Guo
• Keywords: Cathode Material, Flameless Solution Combustion, HNO₃, LiMn₂O₄

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