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Si@polyaniline-based activated-carbon (Si@P-AC) composites, consisting of porous polyaniline-based carbon layers, were synthesized via in-situ polymerization, high-temperature sintering, and steam activation utilizing silicon and aniline. Our experimental results demonstrate that Si@P-AC60 composites, prepared via steam activation at 700[Formula: see text]C for 60 min, exhibit superior rate and cycling performance. At current densities of 100, 200, 300, 500, and 1000 mA⋅g[Formula: see text], the discharge-specific capacities of Si@P-AC60 are 1617, 1133, 1005, 855, and 679 mAh⋅g[Formula: see text], respectively. Additionally, the specific capacity retention rate reaches 75.5% when the current density returns to 100 mA⋅g[Formula: see text], with the specific capacity recovering to 1221 mAh⋅g[Formula: see text]. This extraordinary electrochemical performance can be attributed to the improved electron and ion transport channels provided by the polyaniline-based activated-carbon (P-AC) coating on the surface of silicon particles.

Although the lithium-ion battery has dominated the sustainable energy field for many years, environmentally friendly and inexpensive sodium (Na) is a great contender to reduce the use of limited lithium resources. Sodium-ion batteries (SIBs) have a big catalog of cathode materials grouped into four main types: the Prussian blue analogs, organic-based materials, layered metal oxides, and polyanions, whereas the latter is characterized by sodium superionic conductors (NASICON) with its chemical formula such as Na3V2(PO4)2F3 (NVPF) gaining prevalence. Therefore, this review focuses on the most recent studies to promote the long-term stability, capacity, and energy density of NASICON’s high-potential NVPF.

All-solid-state battery (ASSB) has attracted much attention since it is a potential candidate to solve the safety issue of batteries. However, the rigid contact between the electrode and electrolyte limits the electrochemical performance of ASSB. It is therefore necessary to modify the electrode–electrolyte interface to decrease the interfacial resistance. Herein, we use the aerosol deposition (AD) method to directly deposit the electrode, Na3V2(PO4)3 (NVP), on the Na3Zr2Si2PO[Formula: see text] (NZSP) electrolyte at room temperature. The electrolyte pellet coated with NVP demonstrates a negligible interfacial resistance and low total resistivity of about 1831.64 [Formula: see text] cm[Formula: see text]. Furthermore, the electrochemical performance in terms of cyclic voltammetry and charge/discharge of the ASSB consisting of NVP ∣ NZSP ∣ sodium (Na) metal is also investigated.