Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries

Abstract

Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li2NiTiO4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g-1 at room temperature and 138 mAh g-1 and 50°C, along with a superior cyclability.

Suppressing the P2–O2 Phase Transition of Na0.67Mn0.67Ni0.33O2 by Magnesium Substitution for Improved Sodium‐Ion Batteries

“…On charging, the Ni 2p 3/2 peak changed from divalent (854.9 eV) to tetravalent (856.3 eV). When discharged to 2.5 V, the Ni 2p 3/2 binding energy moves back to almost the original position while no shift is observed for Mn 2p 3/2 (642.0 eV), which is consistent with a previous report . It indicates that within the explored 2.5–4.35 V potential window, the measured capacity for the electrodes originates from the Ni 2+ ↔Ni 4+ redox couple, which is identical to the cyclic voltammetry results (Figure S7).…”

Bandgap Engineering and Signature of Ferromagnetism in Ti1−xMnxO2­ Diluted Magnetic Semiconductor Nanoparticles: A Valence Band Study

“…Moreover, from the combined results of E VBM (derived from UPS valence band spectra) and E g (derived from optical absorbance data) one can see that the conduction band minimum (E CBM ) for Mn0, Mn2, and Mn6 are at À0.63, À0.22, and À0.09 eV, respectively. The observed E CBM values for M0, Mn2, and Mn6 has also been compared as estimated by Wang et al using the following formula: [51]…”

Self energy and excitonic effect in (un)doped TiO2 anatase: a comparative study of hybrid DFT, GW and BSE to explore optical properties

“…Different types of dopants viz. transition metals [6][7][8][9], noble metals [10,11], charge-compensated and uncompensated codoped elements [12,13] have been reported in past. Unfortunately, most of these metal dopants often act as recombination centre owing to their capacity to induce trapping levels inside the band gap.…”