Ma Delong, Shi Xiaomin, Hu Anming
Institute of Laser Engineering, Beijing University of Technology, No. 100 Pingle Yuan, Chaoyao District, Beijing 100124, China.
Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee Knoxville, 1512 Middle Drive, Knoxville, TN 37996, USA.
Nanomaterials (Basel). 2016 Nov 19;6(11):218. doi: 10.3390/nano6110218.
A strategy for growth of porous Ni₂GeO₄ nanosheets on conductive nickel (Ni) foam with robust adhesion as a high-performance electrode for Li-ion batteries is proposed and realized, through a facile two-step method. It involves the low temperature hydro-thermal synthesis of bimetallic (Ni, Ge) hydroxide nanosheets precursor on Ni foam substrates and subsequent thermal transformation to porous Ni₂GeO₄ nanosheets. The as-prepared Ni₂GeO₄ nanosheets possess many interparticle mesopores with a size range from 5 to 15 nm. The hierarchical structure of porous Ni₂GeO₄ nanosheets supported by Ni foam promises fast electron and ion transport, large electroactive surface area, and excellent structural stability. The efficacy of the specially designed structure is demonstrated by the superior electrochemical performance of the generated Ni₂GeO₄ nanosheets including a high capacity of 1.8 mA·h·cm at a current density of 50 μA·cm, good cycle stability, and high power capability at room temperature. Because of simple conditions, this fabrication strategy may be easily extended to other mixed metal oxides (MGeO).
提出并实现了一种通过简便的两步法在具有牢固附着力的导电泡沫镍（Ni）上生长多孔Ni₂GeO₄纳米片作为锂离子电池高性能电极的策略。该方法包括在泡沫镍基底上低温水热合成双金属（Ni，Ge）氢氧化物纳米片前驱体，随后热转化为多孔Ni₂GeO₄纳米片。所制备的Ni₂GeO₄纳米片具有许多粒径范围为5至15nm的颗粒间介孔。由泡沫镍支撑的多孔Ni₂GeO₄纳米片的分级结构保证了快速的电子和离子传输、大的电活性表面积以及优异的结构稳定性。所制备的Ni₂GeO₄纳米片优异电化学性能证明了这种特殊设计结构的有效性，包括在50μA·cm的电流密度下具有1.8 mA·h·cm的高容量、良好的循环稳定性以及室温下的高功率性能。由于条件简单，这种制备策略可以很容易地扩展到其他混合金属氧化物（MGeO）。
