Urea‐assisted combustion synthesis of porous Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ microspheres as high‐performance lithium‐ion battery cathodes

Abstract

An initial urea-assisted combustion and subsequent high-temperature crystallisation route have been used to prepare porous Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 microspheres. The as obtained microspheres with the size of 2-4 μm are composed of numerous nanoparticles, and these nanoparticles with clear corner and edge have the size of 100-200 nm. A possible formation process of porous microspheres structures is discussed. As lithium-ion battery cathodes, the porous microspheres can deliver an initial discharge capacity of 252.3 mAh g −1 with high Coulombic efficiency of 80.6% at current density of 20 mA g −1 , and keep a stable discharge capacity of 115.5 mAh g −1 at 1000 mA g −1. Although the sample obtained without urea only deliver a discharge capacity of 66.7 mAh g −1 at 1000 mA g −1. Maybe, the facile urea-assisted combustion route is suitable for the synthesis of lithium-rich layered oxides as lithium-ion battery cathodes.

Self‐assembled 3D NiCo 2 S 4 nanotubes‐graphene aerogel composites as an excellent anode for Li‐ion batteries

“…With coal, oil, natural gas and other traditional fossil resources increasingly depleting, lithium‐ion batteries (LIBs) have become one of the most important energy‐storage devices in the electric vehicles [1], hybrid electric vehicles and plug‐in hybrid electric vehicles fields because of their high‐energy density, long cycle life and low self‐discharge [2, 3]. However, there are still a lot of problems limiting their commercial application.…”