Syntheses and electrochemical properties of the Na-doped LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries

Spinel-layered composites, where a high-voltage spinel is incorporated in a layered lithium-rich (Li-rich) cathode material with a nominal composition x{0.6Li2MnO3 · 0.4[LiCo0.333Mn0.333Ni0.333]O2} · (1 – x) Li[Ni0.5Mn1.5]O4 (x = 0, 0.3, 0.5, 0.7, 1) are synthesized via a hydroxide assisted coprecipitation route to generate high-energy, high-power cathode materials for Li-ion batteries. X-ray diffraction patterns and the cyclic voltammetry investigations confirm the presence of both the parent components in the composites. The electrochemical investigations performed within a wide potential window show an increased structural stability of the spinel component when incorporated into the composite environment. All the composite materials exhibit initial discharge capacities >200 mAh g–1. The compositions with x = 0.5 and 0.7 show excellent cycling stability among the investigated materials. Moreover, the first cycle Coulombic efficiency achieve a dramatic improvement with the incorporation of the spinel component. More notably, the composite materials with increased spinel component exhibit superior rate capability compared with the parent Li-rich material especially together with the highest capacity retention for x = 0.5 composition, making this as the optimal high-energy high-power material. The mechanisms involved in the symbiotic relationship of the spinel and layered Li-rich components in the above composites are discussed.

Synthesis and Characterization of High-Energy, High-Power Spinel-Layered Composite Cathode Materials for Lithium-Ion Batteries

Laser irradiation construction of nanomaterials toward electrochemical energy storage and conversion: Ongoing progresses and challenges

Improving the electrochemical properties of high-voltage lithium nickel manganese oxide by surface coating with vanadium oxides for lithium ion batteries

Surface modification of LiNi0.5Mn1.5O4 cathodes with ZnAl2O4 by a sol–gel method for lithium ion batteries

High power and capacity of LiNi0.5Mn1.5O4 thin films cathodes prepared by pulsed laser deposition

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High power and capacity of LiNi0.5Mn1.5O4 thin films cathodes prepared by pulsed laser deposition