Study of the effects of nanometer beta-Ni(OH)(2) in nickel hydroxide electrodes

	Study of the effects of nanometer beta-Ni(OH)(2) in nickel hydroxide electrodes
	Han, XJ; Xu, P; Xu, CQ; Zhao, L; Mo, ZB; Liu, T; Liu T(刘涛)
刊名	ELECTROCHIMICA ACTA
	2005
卷号	50 期号:14 页码:2763-2769
关键词	nanometer beta-Ni(OH)(2) cathode discharge specific capacity (CDSC) oxidation state proton diffusion XAS
通讯作者	Harbin Inst Technol, Chem Lab Ctr, Dept Chem, Harbin 150001, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Facil, Beijing 100039, Peoples R China
英文摘要	Nanometer β-Ni(OH)(2), showed by XRD, was prepared by our supersonic coordination-precipitation method, with an average grain size of about 50 nm by TEM. Proton diffusion coefficient of nanometer Ni(OH)(2) and spherical Ni(OH)(2) were 1.93 x 10(-11), and 5.50 x 10(-13) cm(2)/s, respectively, with combination of chronocoulometry and cyclic voltammetry. Charge-discharge test of simulated batteries at 0.2&DEG; C showed that addition of 8 mass% of our prepared nanometer Ni(OH)(2) in nickel hydroxide electrodes led to increases in cathode discharge specific capacity (CDSC) by nearly 10% and the chargeability of the electrode by about 50 mAh/g, and a decrease in polarization. Cycle life test of AA-type MH-Ni batteries discovered that effect of nanometer Ni(OH)(2) in increasing CDSC was more apparent for the first 100 cycles and not much difference was found after 350 cycles. XAS demonstrated a higher oxidation state of Ni in fully charged nanometer Ni(OH)(2) composite electrode (Nano-E) and a lower one in discharged Nano-E, compared with micrometer Ni(OH)(2) spherical electrodes (Micro-E). A larger structure distortion was found in Nano-E, offering more vacancies for proton diffusion. Thus conversion between Ni2+ and Ni3+ was promoted during the charge-discharge process, which was assumed to be one explanation of increasing CDSC with the addition of nanometer Ni(OH)(2). © 2004 Elsevier Ltd. All rights reserved.
学科主题	Electrochemistry
类目[WOS]	Electrochemistry
研究领域[WOS]	Electrochemistry
原文出处	SCI
语种	英语
WOS记录号	WOS:000228961200002
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239818]
专题	高能物理研究所_多学科研究中心高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Han, XJ,Xu, P,Xu, CQ,et al. Study of the effects of nanometer beta-Ni(OH)(2) in nickel hydroxide electrodes[J]. ELECTROCHIMICA ACTA,2005,50(14):2763-2769.
APA	Han, XJ.,Xu, P.,Xu, CQ.,Zhao, L.,Mo, ZB.,...&刘涛.(2005).Study of the effects of nanometer beta-Ni(OH)(2) in nickel hydroxide electrodes.ELECTROCHIMICA ACTA,50(14),2763-2769.
MLA	Han, XJ,et al."Study of the effects of nanometer beta-Ni(OH)(2) in nickel hydroxide electrodes".ELECTROCHIMICA ACTA 50.14(2005):2763-2769.