Abstract
Layer-structured cathode material for lithium ion batteries LiNi 0.375Co 0.25Mn 0.375− x Cr x O 2− x F x (0 ≤ x < 0.1) has been synthesized from sol–gel precursors. Its structure and electrochemical properties were investigated by X-ray diffraction (XRD) and a variety of electrochemical techniques. The XRD results reveal that LiNi 0.375Co 0.25Mn 0.375 −x Cr x O 2− x F x has typical hexagonal structure without impurity. The Cr–F co-doped materials show higher specific discharge capacity and improved cycling performance compared with the raw materials as x in the range of 0.00–0.06. LiNi 0.375Co 0.25Mn 0.315Cr 0.06O 1.94F 0.06 demonstrates an initial discharge capacity of 168.5 mAh g −1 with 20th capacity retention about 93.7%. It has been confirmed that the improved cycling performance is derived from the little increase of electrochemical impedance during the cycling.
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