Surface
modification is usually an effective strategy to improve
the cycling stability and rate capability of the Li-rich layered oxide
cathode materials. Herein, the high-crystallinity LaPO4 with good ionic conductivity was homogeneously deposited on the
surface of Li-rich layered oxide by the slow formation of LaPO4 nanoparticles because of chelating effect between citric
acid and La3+ as well as the using of appropriate phosphorus
source. The surface structure and electrochemical properties of Li-rich
Mn-based materials were characterized by X-ray diffraction, scanning
electron microscopy, high-resolution transmission electron microscopy
(HRTEM), and galvanostatic charge/discharge tests. The results indicate
that LaPO4 nanoparticles are homogeneously coated on the
surface of Li-rich layered Mn-based oxide, and the modification of
LaPO4 with appropriate nanoscale thickness can obviously
promote the cycling stability and rate capability of cathode material.
Especially, the material modified by 2 wt % LaPO4 shows
an optimum cycling stability with capacity retention of 83.2% after
200 cycles at 1 C, the best structure stability, and delivers a discharge
capacity of 146.2 mAh g–1 even at a high current
density of 10 C.
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