School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100, P. R. China.
Hefei National Laboratory for Physical Science at Micro-scale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Small. 2016 Nov;12(43):6024-6032. doi: 10.1002/smll.201602545. Epub 2016 Sep 14.
Much effort has been made to search for high energy and high power density electrode materials for lithium ion batteries. Here, a composite structure among Ge, C and Cu3Ge in Cu3Ge/Ge/C materials with a high rate performance of lithium batteries has been reported. Such Cu3Ge/Ge/C composite is synthesized through the in-situ formation of Ge, C and Cu3Ge by one-pot reaction. Density function theory (DFT) calculations and electrochemical impedance spectroscopy (EIS) suggest a higher electron mobility of the hibrid Cu3Ge/Ge/C composites through the in-situ preparation. As a result, remarkable charge rate over 300 C (fast delithiated capability) and outstanding cycling stability (≈0.02% capacity decay per cycle for 500 cycles at 0.5 C) are achieved for the Cu3Ge/Ge/C composites anode. These Cu3Ge/Ge/C composites demonstrate another perspective to explore the energy storage materials and should provide a new pathway for the design of advanced electrode materials.
人们已经付出了很大的努力来寻找用于锂离子电池的高能量和高功率密度电极材料。在这里，我们报道了一种具有高倍率性能的锂离子电池的 Ge、C 和 Cu3Ge 之间的复合材料结构，即 Cu3Ge/Ge/C 材料。这种 Cu3Ge/Ge/C 复合材料是通过一锅法反应原位形成 Ge、C 和 Cu3Ge 合成的。密度泛函理论（DFT）计算和电化学阻抗谱（EIS）表明，通过原位制备，杂化 Cu3Ge/Ge/C 复合材料具有更高的电子迁移率。因此，Cu3Ge/Ge/C 复合材料的阳极实现了超过 300C 的显著充电速率（快速脱锂能力）和出色的循环稳定性（在 0.5C 下 500 次循环中≈0.02%的容量衰减）。这些 Cu3Ge/Ge/C 复合材料为探索储能材料提供了另一种视角，应该为设计先进的电极材料提供新途径。
