不同Ni含量NiCoAl LDH的制备及CNT/Ni0.3CoAl LDH材料的电化学性能  

Preparation of NiCoAl LDH with Different Ni Contents and Electrochemical Performance of CNT/Ni0.3CoAl LDH Material

作　　者：唐爱菊 米常焕[1] 陈佩佩 TANG Ai-Ju;MI Chang-Huan;CHEN Pei-Pei(Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏省高效电化学储能技术重点实验室,南京210016

出　　处：《无机化学学报》2020年第10期1906-1916,共11页Chinese Journal of Inorganic Chemistry

基　　金：中央高校基本科研专项资金(No.NJ2016058);江苏省重点研发计划—产业前瞻与共性关键技术(No.BY2016003-13);国家重点基础研究发展计划项目(No.2014CB239701)资助。

摘　　要：利用水热法一步合成了不同镍、钴元素比例的镍钴铝层状氢氧化物(NiCoAl LDH),并探究了不同Ni元素含量的NiCoAl LDH的电化学性能,在Ni和Co的物质的量之比为3:7时,Ni0.3CoAl LDH具有最优电化学性能。晶格中部分Ni元素被Co元素代替有利于降低氧化电势,提高材料的化学可逆性。然后通过水热法将CNT与Ni0.3CoAl LDH复合,CNT的复合提高了材料的导电性。CNT/Ni0.3CoAl LDH在1 A·g^-1的电流密度下比容量为1332 F·g^-1,电流密度为10 A·g^-1时比容量保持率为60.4%。在5 A·g^-1的电流密度下循环3000圈容量保持率为87.6%。One-step synthesis of NiCoAl-layered double hydroxide(NiCoAl LDH)with different ratios of nickel and cobalt by hydrothermal method,and the electrochemical performance of NiCoAl LDH with different contents of Ni in nickel and cobalt metal elements were investigated.Ni0.3CoAl LDH materials have the best electrochemical performance when the molar ratio of Ni to Co was 3∶7.Part of Ni element in the lattice was replaced by Co element,which is helpful to reduce the oxidation potential and improve the chemical reversibility of the material.Then the CNT/Ni0.3CoAl LDH composite was synthesized by hydrothermal method,and the carbon nanotubes improved the conductivity of the material.At a current density of 1 A·g^-1,the specific capacitance of CNT/Ni0.3CoAl LDH was as high as 1332 F·g^-1.When the current density was increased to 10 A·g^-1,the capacity retention can reach 60.4%,and the CNT/Ni0.3CoAl LDH electrode still exhibited an cycling stability with 87.6%retention at a current density of 5 A·g^-1 for 3000 cycles.

关 键 词：碳纳米管 复合材料 水热法 电化学性能 

分 类 号：O646[理学—物理化学] O614.81[理学—化学]