Li-rich manganese-based oxide has been identified as the most promising cathode material for next-generation Li-ion batteries,due to its high capacity,high operating voltage,safety,and low cost.Nevertheless,its wide a...Li-rich manganese-based oxide has been identified as the most promising cathode material for next-generation Li-ion batteries,due to its high capacity,high operating voltage,safety,and low cost.Nevertheless,its wide application is restricted by low initial Columbic efficiency,undesirable cycle stability,and poor rate performances.To tackle these issues,single-crystal Li_(1.2)Mn_(0.54)Co_(0.13)Ni_(0.13)O_(2) is synthesized by a self-combustion method.Compared with the poly-crystal Li-rich cathode,the specific discharge capacity of the single-crystal sample increased from 252.0 to304.6 mAh·g^(-1) at 0.1 C.展开更多
In this work,the serpentine powders were sintered to make the serpentine-reinforced Al-matrix composites,and the microstructures of which were characterized by differential scanning calorimetry,thermal gravimetric ana...In this work,the serpentine powders were sintered to make the serpentine-reinforced Al-matrix composites,and the microstructures of which were characterized by differential scanning calorimetry,thermal gravimetric analyzer,and X-ray diffractometer.Scanning electron microscopy equipped with energy dispersive spectroscopy.Results show that the sintered serpentine powders were deeply absorbed on the worn surface and embedded in the furrows and scratches of the matrix,forming a self-repairing surface layer which reduces the friction coefficient.The surface layer coated by serpentine was compact,dense,and uniform with the friction time prolonged,compensating the worn loss and increasing the matrix mass.展开更多
基金financially supported by the Stable Supporting Fund of Shenzhen(No.GXWD2020123015542700320200728114835006)。
文摘Li-rich manganese-based oxide has been identified as the most promising cathode material for next-generation Li-ion batteries,due to its high capacity,high operating voltage,safety,and low cost.Nevertheless,its wide application is restricted by low initial Columbic efficiency,undesirable cycle stability,and poor rate performances.To tackle these issues,single-crystal Li_(1.2)Mn_(0.54)Co_(0.13)Ni_(0.13)O_(2) is synthesized by a self-combustion method.Compared with the poly-crystal Li-rich cathode,the specific discharge capacity of the single-crystal sample increased from 252.0 to304.6 mAh·g^(-1) at 0.1 C.
基金supported by the National Natural Science Foundation of China (Grant Nos. 50975166 and 51475280)the Excellent Engineer Training Program (Metallic material engineering of Shanghai University) of Ministry of Education, China
文摘In this work,the serpentine powders were sintered to make the serpentine-reinforced Al-matrix composites,and the microstructures of which were characterized by differential scanning calorimetry,thermal gravimetric analyzer,and X-ray diffractometer.Scanning electron microscopy equipped with energy dispersive spectroscopy.Results show that the sintered serpentine powders were deeply absorbed on the worn surface and embedded in the furrows and scratches of the matrix,forming a self-repairing surface layer which reduces the friction coefficient.The surface layer coated by serpentine was compact,dense,and uniform with the friction time prolonged,compensating the worn loss and increasing the matrix mass.
