Improving the cycle stability and rate performance of LiNi0.91Co0.06Mn0.03O2 Ni-rich cathode material by La2O3 coating for Lithium-ion batteries |
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Institution: | 1. Next Generation Battery Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Republic of Korea;2. University of Science and Technology, Daejeon, Republic of Korea;3. Faculty of Materials and Chemical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Khyber Pakhtunkhwa, Pakistan |
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Abstract: | In this wok, a uniform layer of La2O3 is coated on the surface of LiNi0.91Co0.06Mn0.03O2 Ni-rich cathode material by using a wet coating process. The XPS and EDX analysis confirms the presence of La2O3 coating on the surface of NCM. The coated samples deliver the superior electrochemical performance, 0.2 wt % La2O3 (LaO-0.2) NCM exhibits discharge capacity of 202.7 mAh g−1 in 1st cycle and delivered the cycle stability of 87.2% after 100 cycles. Besides, the enhanced capacity retention, LaO-0.2 has delivered very high discharge capacity of 80.3 mAh g−1 at very high C-rate of 5C while the pristine sample shows very low discharge capacity (33.4 mAh g−1). CV results shows the significant suppression in the intensity of H2–H3 which indicates the superior electrochemical stability of LaO-0.2 NCM. Thus, we can confirm that La2O3 coating is promising technique to achieve superior electrochemical performance in the long term cycling process. |
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Keywords: | Rate performance cyclic voltammetry |
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