High-Performance Si/SiO_x Nanosphere Anode Material by Multipurpose Interfacial Engineering with Black TiO_2–x

Abstract

Silicon oxides (SiOx) have attracted recent attention for their great potential as promising anode materials for lithium ion batteries as a result of their high energy density and excellent cycle performance. Despite these advantages, the commercial use of these materials is still impeded by low initial Coulombic efficiency and high production cost associated with a complicated synthesis process. Here, we demonstrate that Si/SiOx nanosphere anode materials show much improved performance enabled by electroconductive black TiO(2-x) coating in terms of reversible capacity, Coulombic efficiency, and thermal reliability. The resulting anode material exhibits a high reversible capacity of 1200 mAh g(-1) with an excellent cycle performance of up to 100 cycles. The introduction of a TiO(2-x) layer induces further reduction of the Si species in the SiOx matrix phase, thereby increasing the reversible capacity and initial Coulombic efficiency. Besides the improved electrochemical performance, the TiO(2-x) coating layer plays a key role in improving the thermal reliability of the Si/SiOx nanosphere anode material at the same time. We believe that this multipurpose interfacial engineering approach provides another route toward high-performance Si-based anode materials on a commercial scale.

Accommodation of Silicon in an Interconnected Copper Network for Robust Li‐Ion Storage

“…[23b] In the Si 2p spectrum of bare Si (Figure 3c), the peaks located at ≈99.1 and 99.65 eV are related to the Si 0 and Si 2+ components, respectively, while the peak at ≈102.8 eV suggests existence of SiO 2 on Si NP surface 25. In the Si 2p spectrum of C‐SCP, the small peak located at 101.4 eV is absent in the spectrum of Si/C, which is related to Si 3+ and confirms the formation of Cu 3 Si in C‐SCP as suggested by the results of Cu 2p spectrum 26. In the XRD results (Figure 3d), all specimens exhibit typical diffraction peaks of Si crystal (JCPDS No.…”

Watermelon‐Like Structured SiOx–TiO2@C Nanocomposite as a High‐Performance Lithium‐Ion Battery Anode

“…Extensive researches have been conducted to increase its electrical conductivity and at the same time further mitigate the volume change of SiO x ‐based anode materials. The employed approaches mainly include coating with conductive buffer materials, reducing the particle dimensional size, and altering the particle morphology . Among various strategies, carbon coating on silicon suboxide looks more attractive due to the significant improvement of electrochemical properties .…”

Hierarchical three-dimensional MnO2/carbon@TiO2 nanotube arrays for high-performance supercapacitors

“…Almost all the identified peaks can be perfectly indexed to anatase TiO 2 (PDF # 89-4921) and Ti (PDF # 89-3725). 28 Two extra peaks at 1353 cm −1 and 1596 cm −1 are shown in the spectrum of CTNAs, corresponding to the carbon defect-induced Raman band (the D band) and the ordered graphitic structure (the G band) respectively. The peaks at 26.6° can be indexed to carbon and graphite.…”