Enhanced electrochemical performances of Li2MnO3 cathode materials by Al doping

• DOI: 10.1007/s11581-017-2189-4
• Publication Date: 2017-06-24T00:14:39Z
• Authors: Yanhong Xiang; Xianwen Wu
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Al-doped Li2MnO3 (Li2Mn0.9Al0.1O3) lithium-rich layered oxide is prepared and investigated as cathode material for lithium-ion batteries (LIBs). X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) analyses reveal that the Al element is distributed in the sample homogenously. The Al-LMO sample exhibits a great improvement on the rate capability and cycling stability compared to the LMO sample. The differential capacity versus voltage (dQ/dV) results reveal that Al doping would be to prevent the first charge phase transformation from a layered phase to a cubic spinel-like phase and also slowdown the rate of transformation upon cycling. Electrochemical impedance spectroscopy (EIS) results confirm that Al doping decreases the charge-transfer resistance and improves the electrochemical reaction kinetics.