Wang Jingshun, Zhang Yongquan, Liu Guang, Zhang Tiandong, Zhang Changhai, Zhang Yue, Feng Yu, Chi Qingguo
Key Laboratory of Engineering Dielectrics and Its Application (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080, P. R. China.
College of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310000, P. R. China.
Small. 2024 Feb;20(6):e2304969. doi: 10.1002/smll.202304969. Epub 2023 Sep 28.
Magnesium-ion batteries are widely studied for its environmentally friendly, low-cost, and high volumetric energy density. In this work, the solvothermal method is used to prepare titanium dioxide bronze (TiO -B) nanoflowers with different nickel (Ni) doping concentrations for use in magnesium ion batteries as cathode materials. As Ni doping enhances the electrical conductivity of TiO -B and promotes magnesium ion diffusion, the band gap of TiO -B host material can be significantly reduced, and as Ni content increases, diffusion contributes more to capacity. According to the electrochemical test, TiO -B exhibits excellent electrochemical performance when the Ni element doping content is 2 at% and it is coated with reduced graphene oxide@carbon nanotube (RGO@CNT). At a current density of 100 mA g , NT-2/RGO@CNT discharge specific capacity is as high as 167.5 mAh g , which is 2.36 times of the specific discharge capacity of pure TiO -B. It is a very valuable research material for magnesium ion battery cathode materials.
镁离子电池因其环境友好、成本低和高体积能量密度而受到广泛研究。在这项工作中，采用溶剂热法制备了具有不同镍（Ni）掺杂浓度的二氧化钛青铜（TiO -B）纳米花，用作镁离子电池的阴极材料。由于Ni掺杂提高了TiO -B的电导率并促进了镁离子扩散，TiO -B主体材料的带隙可显著降低，且随着Ni含量增加，扩散对容量的贡献更大。根据电化学测试，当Ni元素掺杂含量为2 at%且涂覆有还原氧化石墨烯@碳纳米管（RGO@CNT）时，TiO -B表现出优异的电化学性能。在100 mA g 的电流密度下，NT-2/RGO@CNT的放电比容量高达167.5 mAh g ，是纯TiO -B比放电容量的2.36倍。它是一种非常有价值的镁离子电池阴极材料研究材料。
