Ultra-small and highly crystallized ZnFe2O4 nanoparticles within double graphene networks for super-long life lithium-ion batteries

作者：Zhang, Longhai; Wei, Tong^*; Yue, Jingming; Sheng, Lizhi; Jiang, Zimu; Yang, Deren; Yuan, Libo; Fan, Zhuangjun^*

来源：Journal of Materials Chemistry A, 2017, 5(22): 11188-11196.

DOI：10.1039/c7ta02726e

• PERFORMANCE ANODE MATERIALS
• FACILE SYNTHESIS
• ELECTRODE MATERIALS
• ENERGY-STORAGE
• COMPOSITES
• ARRAYS
• SUPERCAPACITOR
• MICROCUBES
• STABILITY
• TIO2

To achieve high-performance lithiumion batteries (LIBs), tremendous efforts have been devoted to the design of multifunctional electrode materials with a short Li+ diffusion pathway, high electronic conduction, large electrode/electrolyte contact area and efficiency elastic buffer space to accommodate volume change during cycling. However, the design and synthesis of these versatile structures still remain a big challenge. Here, for the first time we present a novel strategy for spatial confinement of ultra-small and highly crystallized ZnFe2O4 nanoparticles (similar to 12 nm) within double graphene networks constructed by ultra-small graphene sheets (USGNs) and large graphene sheets (GNs). The interconnected double graphene networks can act as a "barrier" for spatially confined growth of ZnFe2O4 and as a "structural buffer" for enhanced cycling stability, as well as electrically conductive paths. As a result, the ZnFe2O4/USGN/GN exhibits a large reversible capacity of 1257 mA h g(-1) at 0.1 A g(-1), excellent rate capability (575 mA h g(-1) at 1 A g(-1)), and superior cycling stability (706 mA h g(-1) at 0.5 A g(-1) after 1000 cycles and 475 mA h g(-1) at 1 A g(-1) even after 2000 cycles). Our strategy can be further extended to the fabrication of other electrode materials for supercapacitors, fuel cells and metal-ion batteries.

• 出版日期2017-6-14
• 单位哈尔滨工程大学