摘要
采用超声波沉淀法制备了不同摩尔比例Y掺杂氢氧化镍,对其粒度分布、结构及电化学性能进行了测试分析。XRD测试表明,样品均为α和β相混合结构的Ni(OH)2。激光粒度测试表明,样品均为纳米颗粒,且分布均匀,平均粒径在50～80nm之间。分别将制备的样品以8%比例与工业用微米级球镍混合制成复合镍电极,电极的可逆性和充电效率均随Y掺杂比例增大先提高后下降,Y含量1.17%时,其电极可逆性和充电效率达到最佳,放电比容量达到最大,0.1和0.5C倍率下的比容量分别达到370和358mAh/g,且具有较低充电电压和较高放电平台,该结果比目前市售镍氢电池比容量(230～250mAh/g)高48%～60%。对加超声波和不加超声波制备的样品性能进行了比较。
Nickel hydroxides doped with different yttrium contents were prepared by a supersonic co-precipitation method.Their particle size distribution,crystal structures and electrochemical performance were characterized.The XRD results show the co-existence of α and β phase in the nickel hydroxides.The laser particle size measurement indicates that all the samples are of nanoparticles,which are distributed uniformly with average size of 50-80 nm.Complex electrodes were prepared by mixing 8wt% nickel hydroxides with commercial micro-sized spherical nickel.The cyclic voltammetry results show that the reversibility and charge efficiency of the electrodes are increased initially and then decreased with the increase of Y content.The best reversibility and charge efficiency is observed in the electrodes with 1.17wt% Y.The discharge capacity reaches 370 mAh/g at 0.1 C and 358 mAh/g at 0.5 C for the 1.17wt% Y-doped electrodes,higher than the theoretical value of pure β-Ni（OH）2.The data is 48%-60% higher than the capacity of market Ni（OH）2 battery（230-250 mAh/g）.F Furthermore,low charge potential and high discharge plateau are also observed.inally,the samples prepared under supersonic were compared with that without supersonic.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第7期1287-1291,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(10774030)
广东省大学生创新实验项目(1184510153)
广州市科技计划(2008J1-C161)
广东工业大学教育教学改革重点项目(2010Z015)
广东工业大学高教研究基金资助项目(2009E06)
关键词
超声波沉淀法
Y掺杂
混合相纳米氢氧化镍
电化学性能
supersonic co-precipitation method
yttrium-doped
multiphase nickel hydroxide
electrochemical performance
