Microemulsion‐Assisted Synthesis of Nanosized LiMnO Spinel Cathodes for High‐Rate Lithium‐Ion Batteries

Abstract

. Microemulsion-assisted synthesis of nanosized Li-Mn-O spinel cathodes for high-rate lithium-ion batteries. ChemPlusChem, 79 (12), 1794-1798.Microemulsion-assisted synthesis of nanosized Li-Mn-O spinel cathodes for high-rate lithium-ion batteries Abstract Li1.16Mn1.84O4 nanoparticles (50-90 nm) with cubic spinel structure are synthesized by combining a microemulsion process to produce ultrafine Mn(OH)2 nanocrystals (3-8 nm) with a solid-state lithiation step. The nanostructured lithium-rich Li1.16Mn1.84O4 shows stable cycling performance and superior rate capabilities as compared with the corresponding bulk material, for example, the nano-sized Li1.16Mn1.84O4 electrode shows stable reversible capacities of 74 mAhg-1 during the 1000th cycle at a high rate of 40 C between 3.0 and 4.5 V. In addition, Li1.16Mn1.84O4 nanoparticles also show high Li storage properties over an enlarged voltage window of 2.0-4.5 V with high capacities and stable cyclability, for example, delivering discharge capacities of 209 and 114 mAhg-1 at rates of 1 and 20 C, respectively.

Nanostructured Li3V2(PO4)3 Cathodes

“…Cathode material is a key part of LIB, which determines its electrochemical performance, safety, and cost . Currently, a number of advantages held by monocline Li 3 V 2 (PO 4 ) 3 make it as an ideal cathode material for LIB applications: 1) high energy density; 2) high theoretical capacity (197 mA h g −1 ) and operating voltage (up to 4.6 V); 3) relatively good Li + mobility; 4) excellent thermal and cyclic stability; and 5) high safety performance .…”