微纳米结构MnO/C材料的制备与储锂性能研究

Synthesis and characterization of MnO/C micro-nano composites

摘要:

以醋酸锰、乙二醇、草酸二水化合物为原料,以聚乙烯吡咯烷酮(PVP)、葡萄糖、间苯二酚为碳源,通过沉淀法辅以热处理,制备出了碳包覆的微纳米结构MnO/C复合材料。利用XRD、SEM、TEM和电化学测试研究MnO/C复合材料的结构、形貌和电化学性能。研究结果表明,以PVP为碳源通过沉淀法制备的MnO/C材料具有微纳米复合结构且材料表面均匀包覆3 nm左右的碳层。该材料作为锂电负极材料在100 mA/g的恒流充放电下循环50次可逆容量达到586.1 mAh/g,并且经过大电流充放电后仍然表现了优异的结构稳定性。

Abstract:

The carbon-coated MnO/C micro-nano composites were fabricated via precipitation, followed by thermal treatment, with Mn(CHCOO)2?H2O, Ethylene glycol and Oxalic acid dehydrate as the reactants, PVP, C6H12O6 and C6H4(OH)2 as carbon. The structure, Morphology and electrochemical properties of the MnO/C materials were characterized with X-ray diffraction, scanning electro microscope, transmission electro microscope and electrochemical experiments. The results indicate that the MnO/C composite with a 3nm carbon-coated layer may be a good anode material for lithium-ion battery. It shows an excellent cycling stability of 586.1mAh/g after 50 cycles and excellent structural stability after several high-current charge and discharge courses.