NiCo-LDH/NiCo-DH复合材料的流动合成及其电化学性能研究

Flow synthesis and electrochemical performance of NiCo-LDH/NiCo-DH composite material

储能性能高的金属氢氧化物电极材料通常采用水热合成和间歇共沉淀法制备,耗能大且在规模化生产过程中容易出现批次差。采用一种简单高效的连续合成策略,利用Y形微通道反应器连续制备具有良好储能性能的金属氢氧化物电极材料。通过优化镍钴前驱体的流速、碱浓度和摩尔比得到了NiCo层状双氢氧化物和NiCo双氢氧化物复合材料(NiCo-LDH/NiCo-DH),将传统间歇共沉淀法制备的NiCo-LDH/NiCo-DH复合材料成功转移到连续操作中。制备的复合材料具有较高的比电容(1 A/g时为1396 F/g)和良好的循环稳定性,在10 A/g的电流密度下进行1000次循环充放电后仍能保持84.7%的比容量。

In the field of energy storage and conversion,metal hydroxides have attracted extensive attention.However,the preparation of metal hydroxide electrode materials with high energy storage performance usually involves energy-intensive methods such as hydrothermal synthesis and intermittent co-precipitation,which can result in batch-to-batch variation during large-scale production.In this study,a simple and efficient continuous synthesis strategy is adopted to produce metal hydroxide electrode materials with good energy storage performance through using a Y-shaped microchannel reactor.By optimizing the flow rate,alkaline concentration,and molar ratio of nickel-cobalt precursors,layered double hydroxide(LDH)and double hydroxide(DH)composites of NiCo are obtained,which successfully transfers the traditional intermittent co-precipitation method to a continuous system.The produced composite material(NiCo-LDH/NiCo-DH)exhibits a high specific capacitance(1396 F·g^(-1)at 1 A·g^(-1))and good cycling stability,maintaining 84.7%of its capacity after 1000 cycles of charge-discharge at a current density of 10 A·g^(-1).