镍钴氢氧化物正极材料制备及镍锌电池性能研究  

Preparation and performance of nickel cobalt hydroxide cathode material for nickel zinc batteries

作　　者：陈晓羽 刘宇 白一帆 应佳俊 吕营 万利佳 胡军平 陈小玲 CHEN Xiaoyu;LIU Yu;BAI Yifan;YING Jiajun;LV Ying;WAN Lijia;HU Junping;Chen Xiaoling(College of Science,Nanchang Key Laboratory of Photoelectric Conversion and Energy Storage Materials,Nanchang Institute of Technology,Nanchang 330099,Jiangxi,China)

机构地区：[1]南昌工程学院理学院,南昌市光电转换与储能材料重点实验室,江西南昌330099

出　　处：《储能科学与技术》2024年第7期2377-2385,共9页Energy Storage Science and Technology

基　　金：国家自然科学基金项目(12264029,61961027);江西省研究生创新专项资金项目(YC2023-S1003)。

摘　　要：镍钴氢氧化物由于理论比容量高、经济效益良好、来源广泛等优点,被广泛应用于镍锌电池中作为电极材料。本工作采用共沉淀法,调控具有不同镍钴比例的硝酸盐溶液,在室温环境下一步合成镍钴双金属氢氧化物,并将其制备成镍锌电池正极材料。采用X射线衍射仪(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)等对所合成的样品进行表征,观察其微观形貌结构,采用电化学工作站等研究其作为镍锌电池电极材料的电化学性能。研究发现,采用高浓度Na OH溶液作为电解液,比其他通过共沉淀法所制备的镍钴氢氧化物在镍锌电池中所表现出的容量更高。结果表明,当镍钴投料比为4∶1时,样品具有最为出色的容量表现,其中,Ni_(4)Co_(1)-LDH样品在电流密度为0.5 A/g时容量可以达到327.9 m Ah/g。将其作为正极材料、锌箔作为负极,与高浓度的Na OH溶液一起组装成镍锌电池进行电化学测试,在0.5 A/g电流密度下具有230.7 m Ah/g的容量,该研究兼具材料合成快速和性能表现良好等优点,研究结果有望为镍锌电池性能优化提供新思路。Nickel-cobalt hydroxide is widely adopted as an electrode material in nickel-zinc batteries owing to its high theoretical specific capacity,economic benefits,and abundant availability.Leveraging a coprecipitation method,this study modulates the concentrations of various nitrate solutions with different nickel-cobalt ratios,enabling the one-step room-temperature synthesis of nickel-cobalt bimetallic hydroxides.Notably,the synthesized samples are intended for use as positive electrode materials in nickel-zinc batteries.Microstructural characterizations of the synthesized samples are performed using several techniques,including X-ray diffraction,X-ray photoelectron spectroscopy,and scanning electron microscopy.Furthermore,the electrochemical performance of the samples as electrode materials for nickel-zinc batteries is assessed using an electrochemical workstation.The results reveal that using a high-concentration NaOH solution as the electrolyte results in higher capacities for nickel-zinc batteries compared to other nickel-cobalt hydroxides prepared via coprecipitation techniques.Notably,the optimal capacity is achieved at a nickel-cobalt feed ratio of 4∶1.Specifically,the Ni_(4)Co_(1)-LDH sample demonstrates the best performance,reaching a capacity of 327.9 mAh/g at a current density of 0.5 A/g.Consequently,a nickel-zinc battery is assembled using the Ni_(4)Co_(1)-LDH sample as its positive electrode material and zinc foil as its negative electrode material,with a high-concentration NaOH solution for electrochemical testing.Results reveal that the battery demonstrates a capacity of 230.7 mAh/g at a current density of 0.5 A/g.Overall,the proposed approach offers advantages of rapid material synthesis and excellent performance,thus offering new insights for the performance optimization of nickel-zinc batteries.

关 键 词：共沉淀法 镍钴氢氧化镍 正极材料 镍锌电池 

分 类 号：TM911[电气工程—电力电子与电力传动]