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Electrochemical stabilities of surface aluminum-doped LiNi0.5Co0.2Mn0.3O2 single crystals under different cutoff voltages

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Abstract Surface Al-doped LiNi0.5Co0.2Mn0.3O2 (523) single crystals with a diameter of 2–4 μm were synthesized by using Ni-Co-Mn hydroxide precursor and combined with further Al3+ coating/annealing operations. Al contents in the… Click to show full abstract

Abstract Surface Al-doped LiNi0.5Co0.2Mn0.3O2 (523) single crystals with a diameter of 2–4 μm were synthesized by using Ni-Co-Mn hydroxide precursor and combined with further Al3+ coating/annealing operations. Al contents in the surface and the bulk structures of product particles were about 1.05% and 0.02%, respectively. XPS, XRD, and HRTEM results confirm that the Al element exist as a dopant within the layered structures of 523 surface. Coin cell testing of the as-prepared 523 cathode were taken under different voltage ranges of 3.0–4.3 V, 3.0–4.4 V, and 3.0–4.5 V, with corresponding 100 cycles capacity retentions of 91.2%, 74.0%, and 67.8% at 25 °C, and 43.1%, 40.1%, and 31.6% at 55 °C. The capacity degradation rate was mainly associated with the interfacial structure instabilities of 523 materials under different voltage ranges, which have been investigated by electrochemical impedance spectroscopy (EIS) and XPS.

Keywords: doped lini0; lini0 5co0; electrochemical stabilities; single crystals; 5co0 2mn0; 2mn0 3o2

Journal Title: Journal of Electroanalytical Chemistry
Year Published: 2019

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