摘要
通过共沉淀法制备钴锰层状双金属氢氧化物(CoMn-LDH)。在制备过程中,考察了钴锰摩尔比、碱浓度、晶化时间对材料形貌与电化学性能的影响。结果表明,当钴锰摩尔比为2∶1、碱浓度为2 mol/L、晶化时间为21 h时,在1 A/g的电流密度下,CoMn-LDH的比容量为952 F/g;经过1 000次充放电,比容量保持在92. 7%;电流密度从0. 5 A/g增加至10 A/g,比容量保持在79. 8%。
Co Mn layered double hydroxides( Co Mn-LDH) are prepared by means of coprecipitation method.During the preparation process,the effects of Co/Mn molar ratio,alkali concentration and crystallization time on the morphology and electrochemical properties of the material are investigated. The results show that the specific capacitance of Co MnLDH can reach 952 F·g-1 under a current density of 1 A·g-1 when the molar ratio of cobalt to manganese is 2 ∶ 1,the concentration of alkali is 2 mol·L-1 and crystallization lasts for 21 h.Its specific capacitance can still remain 92. 7% after1,000 times of charge and discharge.Its specific capacitance remains 79. 8% when the current density increases from 0. 5 A·g-1 to 10 A·g-1.
引文
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