Hierarchical Mesoporous Lithium-Rich Li[Li_0.2Ni_0.2Mn_0.6]O₂ Cathode Material Synthesized via Ice Templating for Lithium-Ion Battery

Abstract

Tuning hierarchical micro/nanostructure of electrode materials is a sought-after means to reinforce their electrochemical performance in the energy storage field. Herein, we introduce a type of hierarchical mesoporous Li[Li0.2Ni0.2Mn0.6]O2 microsphere composed of nanoparticles synthesized via an ice templating combined coprecipitation strategy. It is a low-cost, eco-friendly, and easily operated method using ice as a template to control material with homogeneous morphology and rich porous channels. The as-prepared material exhibits remarkably enhanced electrochemical performances with higher capacity, more excellent cycling stability and more superior rate property, compared with the sample prepared by conventional coprecipitation method. It has satisfactory initial discharge capacities of 280.1 mAh g(-1) at 0.1 C, 207.1 mAh g(-1) at 2 C, and 152.4 mAh g(-1) at 5 C, as well as good cycle performance. The enhanced electrochemical performance can be ascribed to the stable hierarchical microsized structure and the improved lithium-ion diffusion kinetics from the highly porous structure.

Multistage Li1.2Ni0.2Mn0.6O2 Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

“…The obvious splitting (006)/(012) and (108)/(110) peaks suggest that the formation of a perfect‐formed layer‐structure. All the diffraction patterns are in keeping with the perfect‐crystallized layered hexagonal α‐NaFeO 2 structure and the space group R m . Not any peaks for other impurity phases are detected in the diffraction patterns, this is indicative of the high purities, superior crystallinity and a better layer‐structure of the as‐synthesized oxides.…”

Template‐Assisted Synthesis of a One‐Dimensional Hierarchical Li1.2Mn0.54Ni0.13Co0.13O2 Microrod Cathode Material for Lithium‐Ion Batteries

“…In the following two cycles, the anodic peaks of the samples at about 4.0 V are slightly shifted to lower potential due to electrochemical polarization. Although LMCN‐MBs have similar CV curves to those of LMCN‐MRs, the current density of LMCN‐MRs is clearly larger than that of LMCN‐MBs and the overlapping region of the two subsequent charge–discharge profiles of LMCN‐MRs is greater than that of LMCN‐MBs, which indicates better electrochemical reversibility and stability …”

“…[30] In the following two cycles,t he anodic peaks of the samples at about 4.0 Va re slightly shiftedt ol ower potential due to electrochemical polarization.A lthough LMCN-MBs have similar CV curves to those of LMCN-MRs, the currentd ensity of LMCN-MRs is clearly larger than that of LMCN-MBs and the overlapping region of the two subsequentc harge-discharge profiles of LMCN-MRs is greater than that of LMCN-MBs, which indicates better electrochemical reversibility and stability. [20,33] Electrochemical impedance spectroscopy (EIS) of coin cells with LMCN-MRs and LMCN-MBs as cathode materials was per-formed after 10 cycles at 2C,w ith the purposeo fb etter digesting the dynamic characters of the two materials. Both samples werec harged to 4.5 Vb efore testsa nd the Nyquist plots are given in Figure 8a.A dditionally, an equivalent circuit model used to fit the EIS spectra is shown in the inset in Figure 8a;t he fitted impedance parameters are listed in Table 2.…”

Facile synthesis of Li3V2(PO4)3/C cathode material for lithium-ion battery via freeze-drying

“…Furthermore, the freezedrying method can be adopted to synthesize submicrometer-scale and nanoscale material [19,20] . Notedly, the freeze-drying can prevent the agglomeration of the precursor by the sublimation of solvent [21,22] . The residual carbon can coat on the surface of Li 3 V 2 (PO 4 ) 3 after pyrolysis at high temperature in the N 2 atmosphere.…”