Hohn Nuri, Wang Xiaoyan, Giebel Michael A, Yin Shanshan, Müller David, Hetzenecker Andreas E, Bießmann Lorenz, Kreuzer Lucas P, Möhl Gilles E, Yu Haoyang, Veinot Jonathan G C, Fässler Thomas F, Cheng Ya-Jun, Müller-Buschbaum Peter
Lehrstuhl für Funktionelle Materialien, Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
Ningbo Institute of Materials Technology and Engineering, Polymers and Composites Division, Chinese Academy of Science, 1219 Zhongguan West Road, Ningbo 315201, China.
ACS Appl Mater Interfaces. 2020 Oct 14;12(41):47002-47009. doi: 10.1021/acsami.0c13560. Epub 2020 Oct 5.
Nanostructured Ge is considered a highly promising material for Li-ion battery applications as Ge offers high specific capacity and Li-ion diffusivity, while inherent mesoporous nanostructures can contribute resistance against capacity fading as typically induced by high volume expansion in bulk Ge films. Mesoporous GeO/Ge/C films are synthesized using KGe Zintl clusters as a Ge precursor and the amphiphilic diblock copolymer polystyrene--polyethylene oxide as a templating tool. As compared to a reference sample without post-treatment, enhanced surface-to-volume ratios are achieved through post-treatment with a poor-good azeotrope solvent mixture. High capacities of over 2000 mA h g are obtained with good stability over 300 cycles. Information from morphological and compositional characterization for both reference and post-treated sample suggests that the good electrochemical performance originates from reversible GeO conversion reactions.
纳米结构的锗被认为是一种在锂离子电池应用中极具前景的材料，因为锗具有高比容量和锂离子扩散率，而固有的介孔纳米结构可以抵抗通常由块状锗薄膜中的高体积膨胀引起的容量衰减。介孔GeO/Ge/C薄膜是使用KGe齐纳簇作为锗前驱体，两亲性二嵌段共聚物聚苯乙烯-聚环氧乙烷作为模板工具合成的。与未经后处理的参考样品相比，通过用不良-良好共沸溶剂混合物进行后处理可提高表面体积比。在300次循环中具有良好的稳定性，可获得超过2000 mA h g的高容量。参考样品和后处理样品的形态和成分表征信息表明，良好的电化学性能源于可逆的GeO转化反应。
