Selected-control synthesis and characterisation of nanoscaled ammonium vanadates with good cycling stability for lithium-ion batteries

氧化钒和相关纳米材料在低维磁性以及它们在锂离子电池和超级电池中的储能潜力方面特别有希望。主要优点是合成简单、成本低、毒性低、容量大。我们建议研究钒基纳米材料的生长机制和合成路线，以及结构、磁性和电化学性质。这将通过俄罗斯和德国的跨学科合作来实现，该合作结合了东道主团队的能力，即凝聚态物理和包括电池研究在内的材料科学，以及扎哈罗娃博士和她的团队的能力，扎哈罗娃博士是一位在无机纳米结构合成方面具有丰富经验的国际知名无机化学家。特别是，我们将详细研究氧化钒微纳米化合物的结构、形貌和粒度对其物理和电化学性能的影响。将研究两种潜在的电池材料：铵钒氧化物和锂钒氧化物。重点是改善锂离子电池的循环稳定性和放电容量的材料。主要的科学目标是(1)对生长机制和合成路线有基本的了解，(2)研究尺寸效应对磁性能的影响，(3)寻找具有良好的循环稳定性和放电容量的正极材料。

Vanadium oxide and related nanomaterials are particularly promising regarding low-dimensional magnetic properties as well as their potential for energy storage in Li-ion batteries and supercaps. Main advantages are easy synthesis, low cost, low toxicity, and high capacity. We propose to study the growth mechanisms and synthesis routes as well as the structural, magnetic, and electrochemical properties of V-based nanomaterials. This will be achieved by an interdisciplinary Russian-German collaboration combining the competences of the host team, i.e. condensed matter physics and materials science including battery research, and of Dr. Zakharova and her team, who is an internationally renowned inorganic chemist with great experience in synthesis of inorganic nanostructures. In particular, we will study in detail the effect of structure, morphology, and particle size of the vanadium oxide micro- and nanocompounds on their physical and electrochemical properties. Two types of potential battery materials will be investigated: ammonium vanadium oxides and lithium vanadium oxides. Particular emphasis will be put on improving the materials regarding cycling stability and discharge capacity in Li-ion batteries. The main scientific aims are (1) to gain fundamental understanding of growth mechanisms and synthesis routes, (2) to study size effects on the magnetic properties, and (3) to search for cathode material with a good cycling stability and discharge capacity.