Porous Si/Fe2O3 Dual Network Anode for Lithium–Ion Battery Application

Abstract

Benefiting from ultra-high theoretical capacity, silicon (Si) is popular for use in energy storage fields as a Li–ion battery anode material because of its high-performance. However, a serious volume variation happens towards Si anodes in the lithiation/delithiation process, triggering the pulverization of Si and a fast decay in its capacity, which greatly limits its commercial application. In our study, a porous Si/Fe2O3 dual network anode was fabricated using the melt-spinning, ball-milling and dealloying method. The anode material shows good electrochemical performance, delivering a reversible capacity of 697.2 mAh g−1 at 200 mA g−1 after 100 cycles. The high Li storage property is ascribed to the rich mesoporous distribution of the dual network structure, which may adapt the volume variation of the material during the lithiation/delithiation process, shorten the Li–ion diffusion distance and improve the electron transport speed. This study offers a new idea for developing natural ferrosilicon ores into the porous Si-based materials and may prompt the development of natural ores in energy storage fields.

Synthesis of Si/Fe2O3-Anchored rGO Frameworks as High-Performance Anodes for Li-Ion Batteries

“…Two main morphologies, nanoparticles and nanosheets, can be easily d tected (Figure 2a and Figure S4a). Based on previous results [35], the nanosheets relate Fe2O3, while the nanoparticles correspond to Si. It was found that BM48-D4 contains Fe2 nanosheets and Si nanoparticles.…”

“…This was clearly lower than that of Si and Fe 2 O 3 (1007 mAh g −1 ) and limited the development of high-performance anodes. In our improved case, ball milling was utilized for melt-spinning ribbons prior to dealloying treatment [35]. As a result, a porous Si/Fe 2 O 3 dual network anode (free of Al 9 FeSi 3 ) was prepared by changing the elemental distribution and phase composition of the dealloying precursors.…”

Syntheses, characterization, magnetic, and electrochemical properties of perovskite‐type NdFeO3 and NdCoO3 nanofibers

“…The electrochemical properties of the NdFeO 3 and NdCoO 3 NFs as Li‐ion battery anodes were also researched. As presented in Figure 6A, for the first cycle, the broad peak at 0.07–0.1 V was attributed to the reaction of the NdFeO 3 electrode with the electrolyte and the development of a solid electrolyte interface film, where the peak at 1.85 V was mainly ascribed to the transition from Fe 2+ to Fe 3+ 48 . For the second cycle, the oxidation peak of the NdFeO 3 NFs moved slightly to 1.91 V, and the curve showed a wide peak at 0.42 V, whereas the broad peak from 0.6 to 1.0 V was due to the conversion of Fe 3+ to Fe 0 , 49 and the peak at 0.42 V could be derived from the valence changed of Nd.…”

Sea Urchin-like Si@MnO2@rGO as Anodes for High-Performance Lithium-Ion Batteries

“…The EIS diagram consists of a semicircle in the midhigh-frequency region and a diagonal line in the low-frequency region. Here, R CT in the mid-frequency region corresponds to the charge-transfer impedance and W O in the lowfrequency region corresponds to the diffusion of Li + inside the electrode material [56,57]. The R S and R CT values fitted from the equivalent circuit model are summarized in Table S3 for comparison.…”