AlF3-Coating to Improve High Voltage Cycling Performance of Li [ Ni1 ∕ 3Co1 ∕ 3Mn1 ∕ 3 ] O2 Cathode Materials for Lithium Secondary Batteries

Li[Ni 1/3 Co 1/3 Mn 1/3 ]O 2 powders were modified by coating their surface with amorphous AlF3 as a new coating material. The AlF 3 -coated Li[Ni 1/3 Co 1/3 Mn 1/3 ]O 2 electrode showed improved cycle performance and rate capability under a high cutoff voltage range of 4.5 and 4.6 V. AC impedance results showed that the AlF 3 -coated Li[Ni 1/3 Co 1/3 Mn 1/3 ]O 2 has stable charge transfer resistance (R ct ) regardless of the cycle number. Electron diffraction analysis also showed that no structural transition of the primary particles was observed for the AlF 3 -coated electrode. Electrochemical impedance spectroscopy and electron microscopy indicate that AlF 3 coating plays an important role of stabilizing the interface between cathode and electrolyte.

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