Na[NiMnFeTi]O as an Optimized O3-Type Layered Oxide Positive Electrode Material for Sodium-Ion Batteries.

Layered oxides, such as NaMeO (Me = transition metal, = 0-1), are believed to be the most promising positive electrode materials for Na-ion batteries because of their high true density, large capacities, high working potentials, and reversibility. This study identified Na[NiMnFeTi]O as an optimal composition for use as an O3-type positive electrode material in Na-ion batteries on the basis of a comprehensive phase diagram, where the end members of the triangular phase diagram were Na[NiMn]O, Na[NiTi]O, and the hypothetical composition Na[NiFe]O. By investigating the effects of the partial substitution of Mn with Fe and Ti within the Na[NiMnFeTi]O system, we optimized the capacity, working potential, and cycle performance.

Electrochemical Properties of Powdery LiNiMnCoO Electrodes with Styrene-Acrylic-Rubber-Based Latex Binders at High Voltage.

Efforts to improve the energy density and cycling stability of lithium-ion batteries have focused on replacing LiCoO in cathodes with LiNiMnCoO. However, reliance on polyvinylidene fluoride (PVdF) as the binder limits the application of the LiNiMnCoO composite electrode for lithium-ion batteries. Here, we evaluate the electrochemical properties of a LiNiMnCoO (NMC111) powder electrode formed using a waterborne-styrene-acrylic-rubber (SAR) latex binder combined with sodium carboxymethylcellulose.

New frontiers in alkali metal insertion into carbon electrodes for energy storage.

With rising interest in new electrodes for next-generation batteries, carbon materials remain as top competitors with their reliable performance, low-cost, low voltage reactions, and diverse tunability. Depending on carbon's structure, it can attain high cyclability as with Li at crystalline graphite or exceptional capacities with Na at amorphous, porous hard carbons. In this review, we discuss key results and research directions using carbon electrodes for alkali ion storage.

A partially fluorinated polymer network enhances the Li-ion transference number of sulfolane-based highly concentrated electrolytes.

Gelation of sulfolane-based highly concentrated electrolytes using a partially fluorinated polymer enhances the Li-ion transference number of the electrolytes because acidic protons surrounded by fluorine atoms in the polymer network trap anions, and the high Li transference number is effective in suppressing the concentration polarization in Li batteries.