基于阴离子交换反应的NiMn-LDH电极电容性能提升研究

doi:10.19964/j.issn.1006-4990.2021-0223

Abstract

Abstract:

NiMn-LDH nanosheet arrays on Ni foam were synthesized via one-step hydrothermal method,and the capacitive performance was enhanced by soaking the nanoarrays on KOH solution.The as-obtained electrode before and after the soaking process were characterized by SEM,XRD,TEM and XPS technologies.The results showed that the morphology of NiMn-LDH electrode did not change before and after immersion,but anion exchange reaction between CO₃^2- and OH^- anions was occurred in the electrode materials obviously,which reduced the distribution quantity of large CO₃^2- between LDH layers,made the space in the layer become the“reservoir”of OH^-,and reduced the migration distance of OH^- in the charge storage process.Therefore,the capacitance performance had been significantly improved.The electrochemical test results showed that the speci-fic capacitance of the electrode increased from 18.0 F/g to 766.6 F/g（1.69 F/cm²） at the current density of 5 mA/cm².When the power density of the all solid-state asymmetric supercapacitor assembled with the electrode and activated carbon was 900 W/kg,the displayed energy density was 35.9 W·h/kg,and the cycle stability of the device was good.

Key words: NiMn-LDH, electrode activation, supercapacitor, anions exchange reaction.

CLC Number:

TQ138.13

LIANG Qunfang,XU Xuetang,WANG Fan. Study on improvement of capacitance performance of NiMn-LDH electrode material by anions exchange[J]. Inorganic Chemicals Industry, 2022, 54(2): 38-44.

Figures/Tables 8

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Table 1

References 24

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正极	负极	能量密度/ （W·h·kg^-1）	功率密度/ （W·kg^-1）
a-NiMn LDH	AC	35.9	900.00
NiMn-LDH/NCF^[20]	NCF	34.1	350.10
NiMn-LDH/PC-1^[21]	RGO/CNT	18.6	225.03
NiMn-LDH/PPy/BC^[22]	Fe₃O₄@C/MWCNTs	29.8	299.00
rGO@NiMn-LDH@NF^[23]	AC	22.5	700.00
carbon-NiMn-LDH/NF^[24]	AC	37.7	378.13

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Inorganic Acid-Base-Salt Committee of CIESC

Study on improvement of capacitance performance of NiMn-LDH electrode material by anions exchange

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