Preparation,modification and electrochemical characterization of spinel lithium manganate
Guo Xiuyan1, Ma Guojin2, Zeng Yingying1, Wu Xia1
1.School of Mechanical & Electrical Engineering,Jinggangshan University,Ji'an 343009; 2.School of Building Engineering,Jinggangshan University,Ji'an 343009
Abstract: MnCO3 and Li2CO3 powders were selected as materials,the spinel lithium manganate materials for lithium-ion batteries were prepared,and surface modified using a high-temperature solid-state method and TiO2 hydrosol,respectively.The morphology and structure of the active materials before and after modified were studied,the electrochemical characterization of a button battery using the spinel LiMn2O4 as anode was analyzed.After 100 times charging and discharging circulation,the concentration of manganese ion dissolved from the anode materials in the electrolyte was tested.The results shown that,the spinel lithium manganates can be prepared by ball milling dispersion and high temperature solid-state method.The structures of the original and modified active material were not changed,only optimized the cycle performance of CR2016 type battery.At the same 55℃,the first discharge capacities of modified sample under 1C and 10 C rate improved 20% and 1time than those of unmodified sample,respectively.Soaking the anode materials for 15 days at a high temperature and high rate,the concentration of manganese ion dissolved from the modified sample in the electrolyte was only half of the unmodified sample.
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