Sub-micro spinel-structured LiMn1.5Ni0.5O4 material was prepared by a spray-drying method. The electrochemical properties of LiMn1.5Ni0.5O4 were investigated using Li ion model cells, Li/LiPF6 (EC+DMC)/LiMn1.5Ni0.5O4. It was found that the first reversible capacity was about 132 mAh g−1 in the voltage range of 3.60-4.95V. Ex situ X-ray diffraction (XRD) analysis had been used to characterize the first charge/discharge process of the LiMn1.5Ni0.5O4 electrode. The result suggested that the material configuration maintained invariability. At room temperature, on cycling in high-voltage range (4.50-4.95 V) and low-voltage range (3.60-4.50 V), the discharge capacity of the material was about 100 and 25 mAh g−1, respectively, and the spinel LiMn1.5Ni0.5O4 exhibited good cycle ability in both voltage ranges. However, at high temperature, the material showed different electrochemical characteristics. Excellent electrochemical performance and low material cost make this spinel compound an attractive cathode for advanced lithium ion batteries.

The friction and wear behavior of peak aged Cu-Cr-Zr alloys dry sliding against a brass counterface were investigated on a pinon-disk wear tester. The microstructure of the aged Cu-Cr-Zr alloy before and after wear tests was analyzed by transmission electron microscopy. The worn surfaces of the Cu-Cr-Zr alloys were studied by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results indicated that an appropriate aging treatment resulted in the formation of fine, dispersive and coherent precipitates in the Cu matrix and thus could improve the hardness and wear resistance of the Cu-Cr-Zr alloy. The wear rate of the aged Cu-Cr-Zr alloy increased monotonically with increase of the normal load. With increasing sliding speed, the wear rate of the peak aged Cu -Cr-Zr alloy decreased initially and then began to increase. After reaching the maximum wear rate at a speed of 0.445ms-1, the wear rate decreased again with further increasing in the sliding speed. Adhesive wear and abrasive wear were the dominant wear mechanisms under unlubricated conditions.