Electrochemical Properties of Al3+ /Cl- Doped-0.2Li₂MnO₃ · 0.8LiNiO₂ Cathode Materials for Lithium-Ion Batteries

Journal of Nanoscience and Nanotechnology
Yu-Cheng LiuWei-Ren Liu

Abstract

Li-rich layered cathode materials, Li1.2Ni0.4-xAlxMn0.6O2.2-y Cly (0 ≤ x ≤ 0.03 and 0 ≤ y ≤ 0.03), were successfully synthesized through coprecipitation, and the effects of Al3+-Cl- co-substitution on their surface morphology, crystal structure, surface chemistry, and electrochemical performance were characterized through XRD, SEM, XPS, TEM, and electrochemical and charge-discharge cycling. Doping the cathodes with Al3+ and Cl- ions enhanced electrochemical performance at room temperature and at a high working temperature of 55 °C. The as-synthesized optimal composition was Li1.2Ni0.37Al0.03Mn0.6O2.17Cl0.03. The discharge capacity demonstrated high cycle retention at 55 °C. XPS analyses revealed that Al3+-Cl- co-substitution enhanced the structural stability of the cathode materials by forming strong Mn-O and Ni-O bonds. Moreover, compared with un-doped cathode materials, the impedance of Al3+-Cl--codoped cathode materials was drastically reduced by 52.2%. The results indicated that Al3+-Cl--codoped Li-excess cathodes deliver a high cycle performance at high temperatures.

Citations

Mar 10, 2020·Chinese Medical Journal·Jiao-Jiao YuanXiao-Ling Yang

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