Abstract
The Li-rich layered Li1 + x (Mn0.6Ni0.2Co0.2)1 − x O2 (x = 0.14, 0.165, 0.19) cathode materials have been successfully synthesized through a one-pot facile co-precipitation route. The synthesized MCO3 (M = Mn0.6Ni0.2Co0.2) precursor mixing with Li2CO3 was annealed at 500 °C and calcinated at 900 °C. The morphology and structure of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that the sample Li1.165Mn0.501Ni0.167Co0.167O2 (x = 0.165) exhibits the most outstanding electrochemical performance, which may be ascribed to uniform particle size and high crystallinity. It delivers an initial discharge-specific capacity of approximately 241.7 mAh g−1 with an initial coulombic efficiency of 70.3 % at a constant density of 25 mA g−1. A reversible discharge-specific capacity of approximately 207.2 mAh g−1 is still obtained after 100 cycles. The discharge capacities of nearly 226.8, 194.4, 158.9, 143.7, 116.8, 97.5, and 47.6 mAh g−1 can also be attained under 0.1 C, 0.2 C, 0.5 C, 1 C, 2 C, 5 C, and 10 C (1 C = 250 mA g−1), respectively. The Li-rich layered Li1.165Mn0.501Ni0.167Co0.167O2 will be a promising cathode material for advanced lithium-ion batteries.
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Acknowledgments
This work was financially supported by the National Science Foundation of China (NSFC, Nos. 51201066 and 51171065), the Natural Science Foundation of Guangdong Province (No. S2012020010937), Science and Technology Project Foundation of Zhongshan City of Guangdong Province of China (No. 20123A326), and College Students’ Innovative Entrepreneurial Training Program of South China Normal University (No. 2014058).
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Ma, S., Hou, X., Lin, Z. et al. One-pot facile co-precipitation synthesis of the layered Li1 + x (Mn0.6Ni0.2Co0.2)1 − x O2 as cathode materials with outstanding performance for lithium-ion batteries. J Solid State Electrochem 20, 95–103 (2016). https://doi.org/10.1007/s10008-015-3006-5
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DOI: https://doi.org/10.1007/s10008-015-3006-5