High Electrochemical Performance of Monodisperse NiCo2O4 Mesoporous Microspheres as an Anode Material for Li-Ion Batteries

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• 作者：Jingfa Li ; Shenglin Xiong ; Yurong Liu ; Zhicheng Ju ; Yitai Qian
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：981-988
• 全文大小：516K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

Binary metal oxides have been regarded as ideal and potential anode materials, which can ameliorate and offset the electrochemical performance of the single metal oxides, such as reversible capacity, structural stability and electronic conductivity. In this work, monodisperse NiCo₂O₄ mesoporous microspheres are fabricated by a facile solvothermal method followed by pyrolysis of the Ni_0.33Co_0.67CO₃ precursor. The Brunauer鈥揈mmett鈥揟eller (BET) surface area of NiCo₂O₄ mesoporous microspheres is determined to be about 40.58 m² g^鈥? with dominant pore diameter of 14.5 nm and narrow size distribution of 10鈥?0 nm. Our as-prepared NiCo₂O₄ products were evaluated as the anode material for the lithium-ion-battery (LIB) application. It is demonstrated that the special structural features of the NiCo₂O₄ microspheres including uniformity of the surface texture, the integrity and porosity exert significant effect on the electrochemical performances. The discharge capacity of NiCo₂O₄ microspheres could reach 1198 mA h g^鈥? after 30 discharge鈥揷harge cycles at a current density of 200 mA g^鈥?. More importantly, when the current density increased to 800 mA路g^鈥?, it can render reversible capacity of 705 mA h g^鈥? even after 500 cycles, indicating its potential applications for next-generation high power lithium ion batteries (LIBs). The superior battery performance is mainly attributed to the unique micro/nanostructure composed of interconnected NiCo₂O₄ nanocrystals, which provides good electrolyte diffusion and large electrode鈥揺lectrolyte contact area, and meanwhile reduces volume change during charge/discharge process. The strategy is simple but very effective, and because of its versatility, it could be extended to other high-capacity metal oxide anode materials for LIBs.

Keywords:

mesoporous structures; complex metal oxides; spinel structure; lithium-ion battery