Optimized Synthetic Conditions of 0.6Li₂MnO₃·0.4LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials for Lithium Batteries via Sol-Gel Method

Abstract:

Li-rich layer-structure 0.6Li₂MnO₃·0.4LiNi_1/3Co_1/3Mn_1/3O₂ (LMO) cathode materials have been synthesized by sol-gel method using citric acid as a cheating agent. The effects of different ratios of solvent and the amount of excessive lithium are discussed systematically. When changing the ratio of ethanol/H₂O and the amount of excessive lithium, the morphology and electrochemical properties will be changed accordingly. The crystal structure of Li-rich LMO was characterized by X-ray diffraction. The morphology was characterized by scanning electron microscope, and the Li-rich LMO cathodes show bulk with the particle size of around 150 nm. The charge/discharge test showed the Li-rich LMO synthesized with 100% ethanol and 5% Li excess sintered at 900 °C for 24 h subsequently has the best electrochemical performance. Within the cut-off voltage between 2.5 and 4.8 V, the initial discharge capacity is 256.8 mAh g^-1 at 0.1 C; and after 50 cycles the discharge capacity remains 230.2 mAh g^-1. By modifying the ratio of solvent in the formation of gel, it is promising to extend the synthesis of other electrode materials of lithium ion batteries basing on the traditional sol-gel method.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 908-915
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.908
• Online since: April 2016
• Authors: Yu Feng Song, Ying Ying Liu, Lei Lei Cui, Xiao Wei Miao, Hong Bin Zhao, Jian Hui Fang
• Keywords: Cathode Materials, Cyclic Performance, Li-Rich, Lithium Ion Battery, Sol-Gel Method

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