Institute for Advanced Interdisciplinary Research, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Institute for Advanced Interdisciplinary Research, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
J Colloid Interface Sci. 2019 Mar 15;539:665-671. doi: 10.1016/j.jcis.2018.12.104. Epub 2018 Dec 31.
Nanoporous Ge/CuGe composite is fabricated simply through selective dealloying of GeCuAl precursor alloy in dilute alkaline solution. The as-made Ge/CuGe is characterized by three dimensional (3D) bicontinuous network nanostructure which comprises of substantial nanoscale pore voids and ligaments. Owing to the 3D porous architecture and the introduction of well-conductive CuGe, the lithium storage performances of Ge are dramatically enhanced in terms of higher cycling stability and superior rate performance. Nanoporous Ge/CuGe anode delivers steady capacities above 1000 mA h g upon cycling for 70 loops at 400 mA g. In particular, after 300 cycles at the high rate of 3200 mA g the capacity retention for Ge/CuGe is able to reach a maximum of 99.3%. On the contrary, the pure nanoporous Ge encounters severe capacity decay. In view of the outstanding energy storage performances and easy preparation, nanoporous Ge/CuGe exhibits great application potential as an advanced anode in lithium storage related technologies.
通过在稀碱性溶液中选择性脱合金，简单地制备了纳米多孔 Ge/CuGe 复合材料。所制备的 Ge/CuGe 具有三维（3D）双连续网络纳米结构，由大量纳米级孔隙和连接组成。由于 3D 多孔结构和引入了良好导电性的 CuGe，Ge 的锂存储性能得到了显著提高，具有更高的循环稳定性和卓越的倍率性能。纳米多孔 Ge/CuGe 阳极在 400 mA g 的电流密度下循环 70 圈时，稳定的容量超过 1000 mA h g。特别是，在 3200 mA g 的高电流密度下循环 300 次后，Ge/CuGe 的容量保持率能够达到 99.3%的最大值。相比之下，纯纳米多孔 Ge 遇到了严重的容量衰减。鉴于其出色的储能性能和易于制备，纳米多孔 Ge/CuGe 在与锂离子存储相关的技术中作为先进的阳极具有巨大的应用潜力。
