CoV-LDH及其磷化物的制备和赝电容储能研究  

Study on the preparation and pseudocapacitance energy storage of CoV-LDH and its phosphides

作　　者：蒋佳余 刘成林 阎建宏 杨欣尧 蒲洪[2] 胡兵兵 JIANG Jiayu;LIU Chenglin;YAN Jianhong;YANG Xinyao;PU Hong;HU Bingbing(Department of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074;Sichuan Technology Engineering Research Center for Vanadium and Titanium Materials,Panzhihua Sichuan 617000,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆400074 [2]攀枝花学院四川省钒钛材料工程技术研究中心,四川攀枝花617000

出　　处：《蓄电池》2023年第6期270-282,共13页Chinese LABAT Man

基　　金：重庆市科技局博士直通车项目(CSTB2022BSXM-JCX0131);四川省钒钛材料工程技术研究中心科技计划资金项目(2022FTGC07);重庆交通大学科研经费项目(2020020086,2020023032);重庆交通大学研究生科研创新(创新基金)项目(2023S0089,2022CLK10);重庆交通大学大学生创新训练项目(X202110618011,X202210618086);重庆市研究生联合培养基地建设项目(JDLHPYJD2019002)。

摘　　要：磷化处理是一种提高电极材料活性位点的有效策略,被广泛用来增强赝电容材料的电化学储能性能。分别采用水热法和电沉积法合成了微球状和针状形貌结构的钴钒层状双金属氢氧化物(CoV-LDH),经过磷化后得到了赝电容储能性能较好的钴钒磷化物(CoV-P)电极材料。相对于水热法和电沉积法制备的CoV与CoV/NF,磷化后的CoV-P和CoV-P/NF比电容分别提高了61.5%和87.7%。在1 A·g^(-1)的电流密度下,CoV-P/NF的放电比电容达到了1871 F·g^(-1)。当电流密度增加5倍时,具有65%的容量保留率。经动力学分析表明,CoV-P/NF的比电容贡献以赝电容扩散控制过程占主导作用。以活性炭(AC)为负极组装的CoV-P//AC非对称超级电容器,当功率密度为511 W·kg^(-1)时,提供了37 W·h·kg^(-1)的能量密度,且在能量密度为12 W·h·kg^(-1)时,达到了2491 W·kg^(-1)的功率密度,表现出了良好的储能性能。Phosphating treatment is an effective strategy to improve the active sites of electrode materials and is widely used to enhance the electrochemical energy storage performance of pseudocapacitive materials.Cobalt-vanadium layered double hydroxides(CoV-LDH)with microsphere and needle-like morphology were synthesized by hydrothermal method and electrodeposition method,respectively.After phosphating,cobalt-vanadium phosphide(CoV-P)electrode material with better pseudocapacitive energy storage performance was obtained.Compared with CoV-P prepared by hydrothermal method and CoV/NF prepared by electrodeposition method,the specific capacitance of CoV-P and CoV-P/NF after phosphating increased by 61.5%and 87.7%respectively.The discharge specific capacitance of CoV-P/NF reached 1871 F·g^(-1)at a current density of 1 A·g^(-1).When the current density is increased by 5 times,the capacity retention rate is 65%.The kinetic analysis shows that the specific capacitance contribution of CoV-P/NF is dominated by the pseudocapacitance diffusion control process.The CoV-P//AC asymmetric supercapacitor assembled with activated carbon(AC)as the negative electrode provides an energy density of 37 Wh·kg^(-1)at power density of 511 W·kg^(-1),and reaches a power density of 2491 W·kg^(-1)at an energy density of 12 Wh·kg^(-1),showing good energy storage performance.

关 键 词：层状双金属氢氧化物 钴钒化合物 磷化 赝电容 超级电容器 电化学储能 水热法 电沉积法 

分 类 号：TM912.2[电气工程—电力电子与电力传动]