Synthesis of spinel LiMn2O4 microspheres with durable high rate capability
Spinel LiMn2O4 microspheres with durable high rate capability were synthesized by a facile route using spherical MnCO3 precursors as the self-supported templates,combined with the calcinations of LiNO3 at 700 oC for 8 h.The spherical MnCO3 precursors were obtained from the controlling of the crystallizing process of Mn2+ ions and NH4HCO3 in aqueous solution.The effects on the morphology and yield of the MnCO3 were investigated by the mole ratio of the raw materials,reaction time,reaction temperature and surfactant.The as-synthesized MnCO3 and LiMn2O4 were characterized by powder x-ray diffraction (XRD) and scanning electron microscopy (SEM).Galvanostatic charge/discharge tests indicate that the spinel LiMn2O4 microspheres deliver a discharge capacity of 90 rnAh g-1 at 10 C rate and show good capacity retention capability (75 %of their initial capacity after 800 cycles at 10 C rate).The durable high rate capability suggests that the as-synthesized LiMn2O4 microspheres are promising cathode materials for high power lithium ion batteries.
MnCO3 microspheres Self-supported template LiMn2O4 microspheres Rate capability
Zhou Yubo Deng Yuanfu Shi Zhicong Chen Guohua
School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, Chin Key Laboratory for Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engi Centre for Green Products and Processing Technologies, Guangzhou HKUST Fok Ying Tung Research Instit
国际会议
上海
英文
116-116
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）