Hierarchical Structural Evolution of ZnGeO in Binary Solvent and Its Effect on Li-ion Storage Performance.

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ACS applied materials & interfaces, ISSN: 1944-8252, Vol: 9, Issue: 11, Page: 9778-9784

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Liu, Wei; Zhou, Tengfei; Zheng, Yang; Liu, Jianwen; Feng, Chuanqi; Shen, Yue; Huang, Yunhui; Guo, Zaiping
American Chemical Society (ACS)
Materials Science; Engineering; Physical Sciences and Mathematics
article description
Zinc germinate (ZnGeO) with a hierarchical structure was successfully synthesized in a binary ethylenediamine/water (En/HO) solvent system by wet chemistry methods. The morphological evolution process of the ZnGeO was investigated in detail by tuning the ratio of En to HO in different solvent systems, and a series of compounds with awl-shaped, fascicular, and cross-linked hierarchical structures was obtained and employed as anode materials in lithium-ion batteries. The materials with fascicular structure exhibited excellent electrochemical performance, and a specific reversible capacity of 1034 mA h g was retained at a current density of 0.5 A g after 160 cycles. In addition, the as-prepared nanostructured electrode also delivered impressive rate capability of 315 mA h g at the current density of 10 A g. The remarkable electrochemical performances could be ascribed to the following aspects. First, each unit in the three-dimensional fascicular structure can effectively buffer the volume expansions during the Li extraction/insertion process, accommodate the strain induced by the volume variation, and stabilize its whole configuration. Meanwhile, the small fascicular units can enlarge the electrode/electrolyte contact area and form an integrated interlaced conductive network which provides continuous electron/ion pathways.