Solid-State Synthesis of NaFe(PO)PO/C by Ti-Doping with Promoted Structural Reversibility for Long-Cycling Sodium-Ion Batteries.

The cathode material NaFe(PO)PO (NFPP) has shown great potential for sodium-ion batteries (SIBs) due to its cost-effectiveness, prolonged cycle life, and high theoretical capacity. However, the practical large-scale production of NFPP is hindered by its poor intrinsic electron conductivity and the presence of a NaFePO impurity. In this study, we propose a mutually reinforcing approach involving Ti doping, mechanical nano treatment, and in situ carbon coating to produce Ti-NFPP via the solid-state methods of synthesis.

NaGaPOF - a KTiOPO-structured solid sodium-ion conductor.

Advanced ionic conductors are crucial for a large variety of contemporary technologies spanning solid state ion batteries, fuel cells, gas sensors, water desalination, . In this work, we report on a new member of KTiOPO-structured materials, NaGaPOF, with sodium-ion conductivity. NaGaPOF has been obtained for the first time a facile two-step synthesis consisting of a hydrothermal preparation of an ammonia-based precursor, NHGaPOF, followed by an ion exchange reaction with NaNO.

Lithium isotope tracing in silicon-based electrodes using solid-state MAS NMR: a powerful comprehensive tool for the characterization of lithium batteries.

The introduction of lithiated components with different Li/Li isotopic ratios, also called isotopic tracing, can give access to better understanding of lithium transport and lithiation processes in lithium-ion batteries. In this work, we propose a simple methodology based on high-resolution solid-state NMR for the determination of the Li/Li ratio in silicon electrodes following different strategies of isotopic tracing. The Li and Li MAS NMR experiments allow obtaining resolved spectra whose spectral components can be assigned to different moieties of the materials.

(De)Lithiation and Strain Mechanism in Crystalline Ge Nanoparticles.

Germanium is a promising active material for high energy density anodes in Li-ion batteries thanks to its good Li-ion conduction and mechanical properties. However, a deep understanding of the (de)lithiation mechanism of Ge requires advanced characterizations to correlate structural and chemical evolution during charge and discharge. Here we report a combined X-ray diffraction (XRD) and Li solid-state NMR investigation performed on crystalline germanium nanoparticles (c-Ge Nps) based anodes during partial and complete cycling at C/10 Li metal.

Coexistence of three types of sodium motion in double molybdate NaSc(MoO): Na and Sc NMR data and ab initio calculations.

The rechargeable Na-ion batteries attract much attention as an alternative to the widely used but expensive Li-ion batteries. The search for materials with high sodium diffusion is important for the development of solid state electrolytes. We present the results of experimental and ab initio studies of the Na-ion diffusion mechanism in Na9Sc(MoO4)6.