Construction of Zn2GeO4/Graphene Nanostructures with Dually-Protected Functional Nanoframes for Enhanced Lithium-Storage Performances

Caihua Ding, Yongjie Zhao*, Dong Yan, Dezhi Su, Yuzhen Zhao, Heping Zhou, Jingbo Li, Haibo Jin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Application products moving from small-sized devices to large-scale energy storage systems have pushed the development of lithium-ion batteries towards high-energy densities, high-power densities, and long cycle life. Germanium-based anode materials with high theoretical capacities are expected as promising anode candidates to fulfill those requirements, but suffer from the huge volume expansion upon lithiation, leading to serious material pulverization and capacity fading. Herein, a convenient and cost-effective strategy was conceived focusing on construction of dually-protected Zn2GeO4/graphene composites. The rationally designed composite was composed of hollowed Zn2GeO4 nanostructures and flexible graphene layers, which acted as two functional nanoframes to synergistically alleviate the volume change during lithiation/delithiation. As a result, the Zn2GeO4/graphene composite exhibited high specific capacities, excellent cycling stability and desirable rate capability. Specifically, the Zn2GeO4/graphene composite electrode delivered specific capacity of 702 mA h g−1 at 300 mA g−1 after 600 cycles with capacity retention of 85%. In addition, a high reversible capacity of 600 mA h g−1 was retained over 1000 cycles at a high current density of 800 mA g−1. Those achieved-results suggested that rational design of electrode nanostructures offers an effective insight for obtaining high-performance batteries.

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalElectrochimica Acta
Volume251
DOIs
Publication statusPublished - 10 Oct 2017

Keywords

  • Hollow nanostructure
  • Lithium ion battery
  • Long-time cycling stability
  • ZnGeO/graphene composite

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