Abstract
Nb doped cathode materials with the formula LiNi1/3Co1/3Mn1/3−xNbxO2 (x=0, 0.01, 0.02, 0.03) have been prepared successfully by sol–gel method. The effect of Nb substitution on the crystal structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were studied systematically by X-ray diffraction (XRD) and various electrochemical measurements. The results showed Nb substitution played an important role in the good cycling performance of LiNi1/3Co1/3Mn1/3O2. Charge/discharge tests revealed that LiNi1/3Co1/3Mn1/3–0.02Nb0.02O2 showed a capacity retention of 94.1% at 1C after 50 cycles in a high cutoff voltage range (3.0–4.6V), while discharge capacity of LiNi1/3Co1/3Mn1/3O2 remains only 89.4% of that at 1C. Ex-situ XRD analysis and EIS analysis indicated that the improved electrochemical properties of Nb-doped sample result from the more stable structure and lower resistance during the electrochemical cycling.
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