Engineering High-Performance SiO_x Anode Materials with a Titanium Oxynitride Coating for Lithium-Ion Batteries

Abstract

Micron-sized silicon oxide (SiO x ) has been regarded as a promising anode material for new-generation lithium-ion batteries due to its high capacity and low cost. However, the distinct volume expansion during the repeated (de)lithiation process and poor conductivity can lead to structural collapse of the electrode and capacity fading. In this study, SiO x anode materials coated with TiO 0.6 N 0.4 layers are fabricated by a facile solvothermal and thermal reduction technique. The TiO 0.6 N 0.4 layers are homogeneously dispersed on SiO x particles and form an intimate contact. The TiO 0.6 N 0.4 layers can enhance the conductivity and suppress volume expansion of the SiO x anode, which facilitate ion/electron transport and maintain the integrity of the overall electrode structure. The as-prepared SiO x -TiON-200 composites demonstrate a high reversible capacity of 854 mAh g −1 at 0.5 A g −1 with a mass loading of 2.0 mg cm −2 after 250 cycles. This surface modification technique could be extended to other anodes with low conductivity and large volume expansion for lithium-ion batteries.

Sustainable eco‐friendly sub‐micron NaCl crystal powder‐assisted method to synthesize SiOx/C as anode materials originated from rice husk for lithium‐ion batteries

“…The cross‐sectional SEM image reveals that the thicknesses of the B‐MRH and S‐MRH electrodes subjected to 100 cycles were 37.42 μm and 27.81 μm, respectively. The wide cracks observed in the cycled B‐MRH electrode indicated inadequate stress dissipation 43 . On the other hand, the thickness of the cycled S‐MRH electrode was not greater than that of the cycled B‐MRH electrode.…”

“…The wide cracks observed in the cycled B-MRH electrode indicated inadequate stress dissipation. 43 On the other hand, the thickness of the cycled S-MRH electrode was not greater than that of the cycled B-MRH electrode. Furthermore, the S-MRH electrode structure had a nearly intact structure as well as sufficient pores, a large surface area, and high stability.…”

“…The stability of S-MRH electrode is attributed to porous S-MRH structure which facilitates lithium-ion diffusion and maintains electrode stability even after many charge/ discharge cycles. 43,44 The B-MRH electrode has a relatively larger RH chunk size and a denser structure which could impede both ion diffusion and the utilization of the active material. Cycled B-MRH electrode shows dense and covered electrode surfaces due to additional electrolyte decomposition during subsequent cycles, which is in line with lower CE trends.…”

“…By comparing electrode before and after cycling, The porous S‐MRH electrode was well‐preserved and electrode structure was clearly observed even after 100 cycles (Figure 7E, H). The stability of S‐MRH electrode is attributed to porous S‐MRH structure which facilitates lithium‐ion diffusion and maintains electrode stability even after many charge/discharge cycles 43,44 . The B‐MRH electrode has a relatively larger RH chunk size and a denser structure which could impede both ion diffusion and the utilization of the active material.…”

Printable and Free-Standing Silicon-Based Anode for Current Collector-Free Lithium-Ion Batteries

“…The exponential development of lithium-ion batteries (LIBs) has significantly transformed daily life in recent years. , The advent of the smart energy era, characterized by portable electronics and wearable devices, has pursued a paradigm shift toward utilizing high-capacity electroactive materials in diversely shaped electrodes for versatile high-energy-density batteries. , Consequently, silicon (Si)-based anode materials, in the forms of SiO x (0 < x < 2) or Si/C, have garnered considerable attention due to high specific capacity based on the alloying reaction. − However, they suffer from structural instability induced by a large volume change and a low electrical conductivity during electrochemical lithiation/delithiation, which leads to mechanical fractures and particle pulverization. , Addressing these issues requires a concentrated exploration of Si-based materials and polymeric binders through nanostructuring and the development of functional binders, respectively . These approaches can enhance electrochemical performance and mitigate physical and chemical damage occurring during repeated battery cycling, ensuring the availability of high-capacitive Si-based materials as anode materials.…”