Synergetic action of doping and coating on electrochemical performance of lithium manganese spinel as an electrode material for lithium-ion batteries

Abstract

Spinel LiMn 2 O 4 and multidoped spinel LiMn 1.9 Co 0.025 Cr 0.025 Ni 0.025 Fe 0.025 O 4 were synthesized by the glycine-nitrate method and coated with lithium borosilicate (LBS) in order to enhance the electrochemical performance at room temperature. The structure and electrochemical performance of all samples were characterized by inductively coupled plasma-mass spectrometer (ICP-MS), X-ray diffraction (XRD), differential thermal analysis/thermogravimetry (DTA/TG), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), atomic force microscopy (AFM) and galvanostatic charge-discharge measurements. The XRD analysis shows that the samples exhibit a pure spinel phase. The SEM results indicated that LBS particles had encapsulated the surface of the undoped and multidoped LiMn 2 O 4 without causing any structural change. The charge-discharge tests showed that LiMn 1.9 Co 0.025 Cr 0.025 Ni 0.025 Fe 0.025 O 4 displays better cycling performance than the pristine LiMn 2 O 4 at room temperature. However, in the same conditions, LBS-coated LiMn 1.9 Co 0.025 Cr 0.025 Ni 0.025 Fe 0.025 O 4 and LiMn 2 O 4 have better cycling performance than uncoated samples. The results suggest that multidoped and LBS-coated LiMn 2 O 4 could develop into a promising cathode material for lithium ion batteries.

Enhancing Lithium Manganese Oxide Electrochemical Behavior by Doping and Surface Modifications

“…Multiple doped LiCo 0.025 Cr 0.025 Ni 0.025 Fe 0.025 Mn 1.90 O 4 and pristine LiMn 2 O 4 were coated by lithium borosilicate (LBS) through a facile solution method [143,232]. LBS-based glass was proposed as a coating due to its improved ionic conductivity.…”

Redox electrolyte mediated performance enhancement in aqueous zinc ion hybrid supercapacitors composed of spinel BaFe2O4 and cubic Cu2O

“…Recent studies have validated that binary oxides have enhanced electrochemical performance with a richer redox response than single-component oxides. 54 Particularly, spinel ferrites (SF) and their nanocomposites have captured the attention of researchers by virtue of their outstanding physical and chemical features, especially chemical stability with strong anisotropy, variety of oxidation states with higher operation voltage (À1.2-0.65 volts), good permeability and coercivity, excellent magnetic properties yet being cost-effective and eco-friendly. [55][56][57] A spinel ferrite is an intriguing oxide crystal structure with a face-centered cubic core with the chemical notation of MFe 2 O 4 generated by the combination of a triplet cation (Fe 3+ ) with another divalent metal cation, particularly a transition or posttransition metallic cation (M 2+ = Ba 2+ , Co 2+ , Cu 2+ , Mg 2+ , Mn 2+ , Sr 2+ , Zn 2+ , etc.).…”

“…Recent studies have also shown that the chemical structure of SF mechanisms, notably divalent cations rather than Fe 3+ cations, has a significant impact on their distinctive properties. 54,56,[58][59][60] Within SFs, CoFe @multi-walled carbon nanotube (MWCNTs) composite and reported the highest Sc as 390 F g À1 at a current density of 1 mA cm À2 in 2 M KOH electrolyte. Additionally, the fabricated ASC device resulted in a high ED of 26.7 W h kg À1 at a PD of 319 W kg À1 .…”

“…Recent studies have validated that binary oxides have enhanced electrochemical performance with a richer redox response than single-component oxides. 54 Particularly, spinel ferrites (SF) and their nanocomposites have captured the attention of researchers by virtue of their outstanding physical and chemical features, especially chemical stability with strong anisotropy, variety of oxidation states with higher operation voltage (−1.2–0.65 volts), good permeability and coercivity, excellent magnetic properties yet being cost-effective and eco-friendly. 55–57…”

“…Recent studies have also shown that the chemical structure of SF mechanisms, notably divalent cations rather than Fe 3+ cations, has a significant impact on their distinctive properties. 54,56,58–60…”