Synthesis of Co-Ni oxide microflowers as a superior anode for hybrid supercapacitors with ultralong cycle life  

作　　者：Ling-Yang Liu Xu Zhang Hong-Xia Li Bao Liu Jun-Wei Lang Ling-Bin Kong Xing-Bin Yan 

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China [2]School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China [3]Laboratory of Clean Energy Chemistry and Materials,State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Chinese Chemical Letters》2017年第2期206-212,共7页中国化学快报（英文版）

基　　金：supported by the National Nature Science Foundations of China(Nos.21573265 and 51501208)

摘　　要：Li-ion hybrid capacitors（LIHCs）,composing of a lithium-ion battery（LIB） type anode and a supercapacitor（SC） type cathode,gained worldwide popularity due to harmonious integrating the virtues of high energy density of LIBs with high power density of SCs.Herein,nanoflakes composed microflower-like Co-Ni oxide（CoNiO） was successfully synthesized by a simple co-precipitation method.The atomic ratio of as-synthesized CoNiO is determined to be 1：3 through XRD and XPS analytical method.As a typical battery-type material,CoNiO and capacitor-type activated polyanilinederived carbon（APDC） were used to assemble LIHCs as the anode and cathode materials,respectively.As a result,when an optimized mass ratio of CoNiO and APDC was 1：2,CoNiO//APDC LIHC could deliver a maximum energy density of 143 Wh kg^-1 at a working voltage of 1-4 V.It is worth mentioning that the LIHC also exhibits excellent cycle stability with the capacitance retention of -78.2%after 15,000 cycles at a current density of 0.5 A g^-1.Li-ion hybrid capacitors（LIHCs）,composing of a lithium-ion battery（LIB） type anode and a supercapacitor（SC） type cathode,gained worldwide popularity due to harmonious integrating the virtues of high energy density of LIBs with high power density of SCs.Herein,nanoflakes composed microflower-like Co-Ni oxide（CoNiO） was successfully synthesized by a simple co-precipitation method.The atomic ratio of as-synthesized CoNiO is determined to be 1：3 through XRD and XPS analytical method.As a typical battery-type material,CoNiO and capacitor-type activated polyanilinederived carbon（APDC） were used to assemble LIHCs as the anode and cathode materials,respectively.As a result,when an optimized mass ratio of CoNiO and APDC was 1：2,CoNiO//APDC LIHC could deliver a maximum energy density of 143 Wh kg^-1 at a working voltage of 1-4 V.It is worth mentioning that the LIHC also exhibits excellent cycle stability with the capacitance retention of -78.2%after 15,000 cycles at a current density of 0.5 A g^-1.

关 键 词：Li-ion hybrid capacitor Energy storage device Co-precipitation method Cobalt nickel oxide APDC Long cycle life 

分 类 号：O611.4[理学—无机化学] TM53[理学—化学]