Abstract
To improve the electrochemical properties of LiNi 1/3Co 1/3Mn 1/3O 2, powders of Zr-doped mixed transition metal oxides, LiNi 1/3Co 1/3Mn 1/3-xZr xO 2 (x = 0, 0.01, 0.025, 0.05) (LNCMZ), are synthesized via a thermal polymerization method. Their structure and electrochemical properties are investigated by X-ray diffraction, galvanostatic charge–discharge of LNCMZ/Li half cells, galvanostatic intermittent titration technique (GITT), direct current resistance measurement and AC impedance spectroscopy. All of the prepared LNCMZ samples have a hexagonal α-NaFeO 2 structure whose lattice parameters increase monotonously with the Zr content. The Zr doping results in higher lithium diffusion coefficient in LNCMZ and more stable resistance during the electrochemical cycling of LNCMZ/Li cells so that the Zr-doped samples show notable improvement of cycling performance and rate capability. The sample LiNi 1/3Co 1/3Mn 1/3-0.01Zr 0.01O 2 exhibits the best electrochemical performance with capacity retention of 92.7% during 100 cycles and a capacity of 133.9 mAh g −1 at 8 C rate, corresponding to 71.5% of its capacity at 0.1 C.
Published Version
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