Abstract
Li-rich layered oxides are the most promising cathode candidate for lithium ion batteries with high specific energy. In this work, Li1.13Mn0.47Ni0.2Co0.2O2-coated Li [Li0.2Mn0.52Ni0.13Co0.13 V0.02]O2 cathode materials were synthesized via a sol–gel method, and their electrochemical performance was evaluated. Structural and morphological characterizations of the materials demonstrate that Li[Li0.2Mn0.52Ni0.13Co0.13V0.02]O2 particles are covered by Li1.13Mn0.47Ni0.2Co0.2O2 particles. Moreover, the Li1.13Mn0.47Ni0.2Co0.2O2 coating has no obvious effect on the crystal structure of Li-rich materials. The specific capacity, cycle performance, and rate capability of Li-rich materials are significantly improved with the coating of Li1.13Mn0.47Ni0.2Co0.2O2. Materials coated with 1 wt% to 3 wt% Li1.13Mn0.47Ni0.2Co0.2O2 exhibit the highest capacity retention of 93% after 100 cycles at 1 C, which is 10% higher than that of the uncoated one. The specific capacity of 3 wt% Li1.13Mn0.47Ni0.2Co0.2O2-coated material is 115.9 mAh g−1 at 5 C, and that of the blank sample is 89.8 mAh g−1 under the same condition. The cyclic voltammetry and electrochemical impedance spectra reveal that the enhanced cycle performance and rate capability of the surface-modified Li-rich materials are due to the presence of the Li1.13Mn0.47Ni0.2Co0.2O2 coating layer, which restrains structural transformation with cycling and decreases the charge-transfer resistance of the materials.
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This work was financially supported by the National Key Laboratory Foundation of China (Grant No. 6142808020117C01).
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Zhao, L., Sun, Y., Song, K. et al. Enhanced electrochemical performance of Li-rich Li[Li0.2Mn0.52Ni0.13Co0.13V0.02]O2 cathode materials for lithium ion batteries by Li1.13Mn0.47Ni0.2Co0.2O2 coating. Ionics 26, 4455–4462 (2020). https://doi.org/10.1007/s11581-020-03621-6
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DOI: https://doi.org/10.1007/s11581-020-03621-6