Well-Dispersed ZnFe2O4 Nanoparticles onto Graphene as Superior Anode Materials for Lithium Ion Batteries

Abstract

We prepared well-dispersed ZnFe2O4 (ZFO) nanoparticles on a graphene sheet by a facile one-step hydrothermal method using glucose as a novel linker agent and low-cost graphene flake. It was found that the glucose linkage on graphene not only prevented the aggregation of ZFO particles, but also induced the exfoliation of graphene flakes. The addition of glucose during the synthesis made surface linkages on the graphene surface, and it reacted with ZFO precursors, resulting in the well-dispersed ZFO nanoparticles/graphene composite. Furthermore, the size distribution of the resultant composite particles was also shifted to the smaller particle size compared to the composite prepared without glucose. The newly prepared ZFO/graphene composite provided a higher lithium storage capability and cycle performance compared to the ZFO/graphene sample which was prepared without glucose. The good dispersion of ZFO nanoparticles on graphene and the small particle size of the composite led to markedly improved electrochemical performance. Its reversible discharge capacity was 766 mAh g−1 at 1 A g−1, and it also maintained as 469 mAh g−1 at 6 A g−1.

Facile thermochemical conversion of FeOOH nanorods to ZnFe2O4nanorods for high-rate lithium storage

“…The effect of trace amounts of ZnO in ZFO on the electrochemical properties is negligible, since its amount of ZnO is much lesser than that in the literatures which showed synergetic effects of composite of ZnO/ ZFO. 8,12,15,21 The ZFO-NR sample maintains the ZFO structure aer carbonization. The XRD peaks shown in Fig.…”

“…First, 5 mmol Zn(NO 3 ) 2 and 10 mmol Fe(NO 3 ) 2 were dissolved in 40 mL of distilled water, and then 15 mL of concentrated NaOH was added to the formal solution. The resulting solution was transferred to a Teon-lined autoclave reactor and maintained at 180 C for 12 h. The collected precipitate was washed with distilled water and ethanol and dried at 60 C for 24 h. 21 For the electrodes, a slurry was prepared by mixing synthesized samples, Super P conductive additive, and sodium carboxymethyl cellulose (CMC, 1.25 wt%) binder at a weight ratio of 75 : 20 : 5 with water as a solvent. The mixture was then subjected to ball milling for 24 h at 100 rpm.…”

“…The mixture was then subjected to ball milling for 24 h at 100 rpm. 21 The prepared slurry was coated on copper foil and dried at 70 C in a vacuum oven for 12 h to remove moisture. Then, the slurry was pressed to a nal thickness of 50-60 mm and cut into 14 mm diameter sections.…”

ZnFe2O4, a Green and High-Capacity Anode Material for Lithium-Ion Batteries: A Review

“…[36] The obtained unique morphologies can provide materials with high reversible capacity, enhanced rate performance, and superior cycling stability due to the synergetic effect of carbon matrix and carbon coating (see Table 1). The carbon network offers a continuous conductive pathway for electron transport and high surface area, improves the mechanical flexibility of active materials, and, more importantly, can help to maintain the structural integrity of ZnFe2O4 during repeated lithiation/delithiation [111][112][113][114][115][116]. Table 1.…”

Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery

“…The electrochemical performance of the samples was tested in a 18650-type full battery using commercial graphite/Mesocarbon microbeads (MTI, America) as the counter anode instead of novel anodes [39,40]. Such an approach is seldom reported in research papers, yet provides better evidence for material commercialization.…”