High-performance porous spherical cathode materials based on CaCO3-template synthesis of LiNi1/3Co1/3Mn1/3O2 for lithium-ion batteries

摘要

The porous spherical LiNi1/3Co1/3Mn1/3O2 has been synthesized using CaCO3-template and a conventional solid-state reaction. The physical and electrochemical properties of the materials are examined by many characterizations including XRD, SEM, EDS, BET, CV, EIS, and galvanostatic charge-discharge cycling. The results indicate that the as-synthesized materials prepared by this new method own a well-ordered layered alpha-NaFeO2 structure (space group: R-3m (166)). And massively porous channels could be observed in the spherical LiNi1/3Co1/3Mn1/3O2. Compared with the firm-surface spherical LiNi1/3Co1/3Mn1/3O2, the porous spherical material exhibits larger specific surface area and superior electrochemical performances. It delivers a higher initial capacity of 164.0 mAh g(-1) at 0.1 C (1 C = 180 mA g(-1)) between 2.7 and 4.3 V, and 93.5 mAh g(-1) is still respectively reached at 20 C. After 100 charge-discharge cycles at 1 C in the range of 2.7-4.3 V, the capacity retention is 95.1 %, indicating excellent cycling stability.