LiNi_0.5Mn_1.5O₄ Porous Nanorods as High-Rate and Long-Life Cathodes for Li-Ion Batteries

Abstract

Spinel-type LiNi0.5Mn1.5O4 porous nanorods assembled with nanoparticles have been prepared and investigated as high-rate and long-life cathode materials for rechargeable lithium-ion batteries. One-dimensional porous nanostructures of LiNi0.5Mn1.5O4 with ordered P4332 phase were obtained through solid-state Li and Ni implantation of porous Mn2O3 nanorods that resulted from thermal decomposition of the chain-like MnC2O4 precursor. The fabricated LiNi0.5Mn1.5O4 delivered specific capacities of 140 and 109 mAh g(-1) at 1 and 20 C rates, respectively. At a 5 C cycling rate, a capacity retention of 91% was sustained after 500 cycles, with extremely low capacity fade (<1%) during the initial 300 cycles. The remarkable performance was attributed to the porous 1D nanostructures that can accommodate strain relaxation by slippage at the subunits wall boundaries and provide short Li-ion diffusion distance along the confined dimension.

Multishelled Ni‐Rich Li(NixCoyMnz)O2 Hollow Fibers with Low Cation Mixing as High‐Performance Cathode Materials for Li‐Ion Batteries

“…To avoid cation mixing and thus improve the performance of Ni‐rich Li(Ni x Co y Mn z )O 2 electrodes, the design of 1D structures is a prudent strategy. 1D structures also guarantee a high electrode–electrolyte contact area and a short transport path for electrons and Li + ions,8 all of which could be expected to improve the rate performance of the Li(Ni x Co y Mn z )O 2 materials. In addition, porous electrodes with multishelled structures have attracted interest in recent years based on the following advantages 9.…”

Surface stability of spinel MgNi0.5Mn1.5O4 and MgMn2O4 as cathode materials for magnesium ion batteries

“…By replacement of part of the Mn with Ni, some Mn can keep at a state of 4 + , thus avoiding the JT distortion, as discussed in the section of results of this paper. From the superior rate capability of the LNMO [20], in this paper we used a doping level of 0.5 in the MgNi 0.5 Mn 1.5 O 4 (MNMO) to investigate the doping effect on the surface stability of the MMO. The optimal doping level is needed to verify from theoretical and experimental confirmation.…”

Electrochemical performances discharged to lower potential for LiNi0.5Mn1.5O4 cathode material synthesized by PAA-assisted co-precipitation method

“…Since LiCoO 2 has economic and environmental issues [2], intensive research has been directed towards the development of alternative low cost, environmentally friendly cathode materials as possible replacement of LiCoO 2 . Among them, spinel LiNi 0.5 Mn 1.5 O 4 material is one of the promising and attractive cathode materials for next generation lithium-ion batteries because of its high voltage, acceptable stability, and good cycling performance [3,4].…”