Synthesis and electrochemical performance of NiO/Fe3O4/rGO as anode material for lithium ion battery

Improving the Cycling Stability of Fe3O4/NiO Anode for Lithium Ion Battery by Constructing Novel Bimodal Nanoporous Urchin Network

“…The two reduction peaks move to about 1.56 V and 0.76 V in the later cycles. The difference in the peak position and peak intensity between the first cycle and the following cycles can be attributed to the formation of a solid electrolyte interface (SEI) layer and the structural modification of Li + drive during the lithiation process [26]. In the first anodic scan, the broad peak in the range of 1.1-1.7 V can be ascribed to the step-by-step oxidation of Fe 0 to Li x Fe 3 O 4 and Fe 3+ , respectively [30].…”

“…The XPS full survey spectrum ( Figure 4 a) clearly reveals the presence of Ni, Fe, O elements, and undealloyed residual Al. Figure 4 b presents two characteristic peaks at 855.1 eV and 872.6 eV, which correspond to Ni 2p 3/2 and Ni 2p 1/2 [ 16 , 26 ], respectively. Each characteristic peak can be deconvoluted into two peaks related to the Ni 2+ and the Ni 3+ .…”

“…These satellites involve core ionization and simultaneous excitation of a valence electron into an unoccupied orbital, typically described as shake excitations [ 27 ]. The Fe 2p spectrum in Figure 4 c shows two characteristic peaks at 710.3 eV and 723.4 eV, which are ascribed to Fe 2p 3/2 and Fe 2p 1/2 [ 26 ], respectively. Every characteristic peak is a superposition of two peaks including the Fe 3+ peak and the Fe 2+ peak.…”

"Preparation of 3D-Porous Graphene Aerogel for High- Performance Anode of Lithium-Ion Batteries"

“…Additionally, as shown in Figure 3(e), all GA anodes show nearly 100% coulombic efficiency, which further confirms that the cycling stability of the obtained GA materials is very high for LIBs (Figure 4). to the interfacial charge-transfer resistance [37,38], and an approximate straight sloping line at the less frequent regions corresponding to Warburg impedance [39]. By contrast, GA-6 has a smaller semicircle and a higher slope, which is attributed to the porous structure preventing the self-aggregation of the GO sheets and providing more Li + ion diffusion channels.…”

Nanostructured Graphene Oxide-Based Hybrids as Anodes for Lithium-Ion Batteries

“…The initial discharge capacity was 841 mAh g −1 and maintained 647 mAh g −1 after 200 cycles at the current density of 0.5 Ag −1 . Rate capability tests showed that the discharge capacity was still 582 mAh g −1 after 200 cycles at 1 A g −1 [395].…”