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Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors

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Nano Research 2015年第8期8卷 2744-2754页

作者： Mingyang Yang Hua Cheng Yingying Gu Zhifang Sun Jing Hu Lujie Cao Fucong Lv Minchan Li Wenxi Wang Zhenyu Wang Shaofei Wu Hongtao Liu Zhouguang Lu Department of Materials Science and Engineering South University of Science and Technology of China Shenzhen 518055 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

Novel three-dimensional （3D） concentration-gradient Ni-Co hydroxide nanostructures （3DCGNC） have been directly grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder- and conductor-free electrode for supercapacitors. Based on a three- electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1,760 F·g^-1 and a remarkable rate capability whereby more than 62.5% capacitance was retained when the current density was raised from 1 to 100 A·g^-1. More importantly, asymmetric supercapacitors were assembled by using the obtained 3DCGNC as the cathode and Ketjenblack as a conventional activated carbon anode. The fabricated asymmetric supercapacitors exhibited very promising electrochemical performances with an excellent combination of high energy density of 103.0 Wh·kg^-1 at a power density of 3.0 kW·kg^-1, and excellent rate capability-energy densities of about 70.4 and 26.0 Wh·kg^-1 were achieved when the average power densities were increased to 26.2 and 133.4 kW·kg^-1, respectively. Moreover, an extremely stable cycling life with only 2.7% capacitance loss after 20,000 cycles at a current density of 5 A·g^-1 was achieved, which compares very well with the traditional doublelayer supercapacitors.

关键词： electrodeposition concentration-gradient nickel cobalt hydroxides supercapacitors

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Synthesis and electrochemical performance of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2 as a concentration-gradient cathode material for lithium batteries

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Chinese Chemical Letters 2014年第6期25卷 883-886页

作者： Long-Wei Liang Ke Du Zhong-Dong Peng Yan-Bing Cao Guo-Rong Hu School of Metallurgy and Environment Central South University

A well-ordered and spherical LiNi0.6Co0.2Mn0.2O2 cathode material was successfully synthesized from Ni and Mn concentration-gradient precursors via co-precipitation. The crystal structure, morphology and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and charge-discharge tests. The material delivered an initial discharge capacity of 174.3 mAh/g at 180 mA/g （1 C rate） between 2.8 and 4.3 V and more than 93.1% of that was retained after 100 cycles. In addition, it also exhibited excellent rate capability, high cut-off voltage and temperature performance.

关键词： Lithium secondary batterie sLiNi0.6Co0.2Mn0.2O2 concentration-gradient Electrochemical performance

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