Enhanced Electrochemical Performance of Ca-Doped NaV(PO)F/C Cathode Materials for Sodium-Ion Batteries.

NaV(PO)F (NVPF) with a NASICON structure has garnered attention as a cathode material owing to its stable 3D structure, rapid ion diffusion channels, high operating voltage, and impressive cycling stability. Nevertheless, the low intrinsic electronic conductivity of the material leading to a poor rate capability presents a significant challenge for practical application. Herein, we develop a series of Ca-doped NVPF/C cathode materials with various Ca doping levels using a simple sol-gel and carbon thermal reduction approach.

Superionic Conductivity in Sodium Zirconium Chloride-Based Compounds.

All-solid-state sodium batteries are attracting intensive attention, and chloride-based solid electrolytes are promising candidates for use in such batteries because of their high chemical stability and low Young's modulus. Here, we report new superionic conductors based on polyanion-added chloride-based materials. Na Zr(SO ) Cl showed a high ionic conductivity of 1.

Preparation of a single-phase all-solid-state battery the crystallization of amorphous sodium vanadium phosphate.

A single-phase all-solid-state battery was prepared from amorphous NaV(PO) (NVP) powder, which was synthesized by mechanical milling of the crystalline NVP. It was found that the structure of the amorphous NVP was much different from that of the crystalline NVP from the FT-IR measurement. The charge-discharge curves of the half-cell using organic electrolyte were also much different from those in the case of crystalline NVP.

High capacity all-solid-state lithium battery enabled by formation of an ionic conduction path by lithiation of MgH.

All-solid-state Li batteries have attracted significant attention because of their high energy density and high level of safety. In a solid-state Li-ion battery, the electrodes contain a solid electrolyte that does not contribute directly to the capacity. Therefore, a battery that does not require a solid electrolyte in its electrode mixture should exhibit a higher energy density.

The formation of an electrolyte the lithiation of Mg(BH) in an all-solid-state lithium battery.

The present work proposes a new approach to increasing the capacity of all-solid-state batteries, based on the in situ formation of an electrolyte in a Mg(BH4)2 electrode. Charge/discharge assessments of the electrode composed of Mg(BH4)2 and acetylene black showed an initial reversible capacity of 563 mA h g-1-Mg(BH4)2.

A single-phase all-solid-state lithium battery based on LiCrTi(PO) for high rate capability and low temperature operation.

We report a battery made from a single material using LiCrTi(PO) as the anode, cathode and electrolyte. A high rate capability at room temperature and very low-temperature operation (233 K) were possible as a result of the superior ionic conductivity and low interfacial resistance obtained from the single-phase cell design.

Proton-Driven Intercalation and Ion Substitution Utilizing Solid-State Electrochemical Reaction.

The development of an unconventional synthesis method has a large potential to drastically advance materials science. In this research, a new synthesis method based on a solid-state electrochemical reaction was demonstrated, which can be made available for intercalation and ion substitution. It was referred to as proton-driven ion introduction (PDII).

Discharge performance of solid-state oxygen shuttle metal-air battery using Ca-stabilized ZrO2 electrolyte.

The effects of metal choice on the electrochemical performance of oxygen-shuttle metal-air batteries with Ca-stabilized ZrO2 (CSZ) as the electrolyte and various metals as the anodes were studied at 1073 K. The equilibrium oxygen partial pressure (P O 2) in the anode chamber was governed by the metal used in the anode chamber. A lower-P O 2 environment in the anode decreased the polarization resistance of the anode.

Mg-air oxygen shuttle batteries using a ZrO2-based oxide ion-conducting electrolyte.

A new concept of an "oxygen shuttle" type battery for Mg-air solid oxide batteries using a Ca-stabilized ZrO2 electrolyte was proposed and studied. The observed open circuit potential and discharge capacity were 1.81 V and 1154 mA h gMg(-1) (52% of the theoretical capacity), respectively.

High capacity of an Fe-air rechargeable battery using LaGaO3-based oxide ion conductor as an electrolyte.

Rapid growth and improved functions of mobile equipment present the need for an advanced rechargeable battery with extremely high capacity. In this study, we investigated the application of fuel cell technology to an Fe-air rechargeable battery. Because the redox potential of Fe is similar to that of H(2), the combination of H(2) formation by the oxidation of Fe with a fuel cell has led to a new type of metal-air rechargeable battery.