Capacitive performance and cycling stability of NixCo1-x(OH)2 xerogels

doi:10.3969/j.issn.2095-4239.2015.04.001

Abstract

Abstract: Ni_xCo_1-_x(OH)₂ xerogels were formed by sol-gel method under ambient pressure. The structure of these materials was characterized using N₂ (77 K) adsorption, XPS and XRD. Their capacitive performance was evaluated by using galvanostatic technique. The results show that the Ni_xCo_1-_x(OH)₂ xerogels materials have a well-developed mesopore structure. The rate performance of the Ni_xCo_1-_x(OH)₂ xerogels materials was greatly improved by Co impregnate, and the optimal amount of Co was 24%. The crystal structure of Ni_xCo_1-_x(OH)₂ xerogels is the same as that of the β-Ni(OH)₂. The crystallite size of the Ni_xCo_1-_x(OH)₂ xerogels will change largely except the amount of Co is above 20%. The electrochemical capacitor consisted with activated carbon and Ni_0.76Co_0.24(OH)₂ was cycled at a current density of 20 mA/cm², a coulombic efficiency above 95% and above 90% capacity retention after 100000 cycles were obtained. In the process long charge/discharge cycle, the crystallite size of the Ni_0.76Co_0.24(OH)₂ xerogels changes little, but the lattice parameter of the Co_0.24Ni_0.76(OH)₂ xerogels gradually shifts to the lattice parameters of the ideal β-Ni(OH)₂ crystal.

Key words: xerogel, NixCo1-x(OH)2 xerogels, electrochemical capacitor, galvanostatic technique

CLC Number:

TM53

CHENG Jie, LIU Hanmin, WEN Yuehua, CAO Gaoping. Capacitive performance and cycling stability of Ni_xCo_1-_x(OH)₂ xerogels[J]. Energy Storage Science and Technology, 2015, 4(4): 339-346.

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Capacitive performance and cycling stability of Ni_xCo_1-_x(OH)₂ xerogels

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