中文摘要：

采用流变相法结合控制热处理制备添加钇（Y）的LiNi0.5Mn1.5O4材料（LiNi0.5-0.5z Mn1.5-0.5z Yz O4）,研究钇添加量对LiNi0.5Mn1.5O4的结构、形貌、导电率以及电化学性能的影响。结果表明：添加适量的Y可抑制LiNi0.5Mn1.5O4颗粒的长大,稳定LiNi0.5Mn1.5O4的结构,提高材料的电导率,降低循环过程中的电化学极化,最终有效地提高LiNi0.5Mn1.5O4的循环性能和倍率性能。在研究范围内,添加量z为0.02时,材料LiNi0.49Mn1.49Y0.02O4具有最好的电化学性能。在0.2C放电时,LiNi0.49Mn1.49Y0.02O4的首次放电容量达到132.7 m A·h/g,经100次循环后,平均每次循环的容量衰减仅为0.011%。而在5.0C和10.0C放电时,LiNi0.49Mn1.49Y0.02O4仍显示出优异的倍率性能,首次放电容量仍达到0.2C放电时电容量的80.9%和76.9%,分别为107.3 m A·h/g和102.1 m A·h/g。

英文摘要：

LiNi 0.5 Mn 1.5 O 4 materials with Y addition （LiNi 0.5-0.5z Mn 1.5-0.5zYzO4） were prepared using rheological phase method combining with controlled heat-treatment. The effects of Y content on the structure, surface morphology, conductivity and electrochemical properties were investigated. The results show that the cycling performance and rate capability of LiNi 0.5 Mn 1.5 O 4 materials will be improved effectively because that Y addition can suppress the growth of LiNi 0.5 Mn 1.5 O 4 particles, stabilize the structure of LiNi 0.5 Mn 1.5 O 4 , increase the electronic conductivity of the electrode materials and decrease the electrochemical polarization in cycle. The materials with z of 0.02 show the best electrochemical properties. The first discharge capacity of LiNi 0.49 Mn 1.49 Y 0.02 O 4 is more than 132.7 mA·h/g, an average capacity loss per cycle is 0.011% after cycling at 0.2C for 100 times. Even discharging at 5C and 10C, LiNi0.49Mn1.49Y0.02O4 still delivers a discharge capacity of 107.3 mA·h/g and 102.1 mA·h/g, equaling to 80.9% and 76.9%of the discharge capacity at 0.2C, suggesting excellent rate capability of LiNi 0.5 Mn 1.5 O 4 with Y addition.