Nano high-entropy oxide material, preparation method thereof and lithium-sulfur battery positive electrode material

Abstract

The invention belongs to the technical field of materials, and particularly relates to a nano high-entropy oxide material and a preparation method thereof, and a lithium-sulfur battery positive electrode material. Comprising the following steps: dissolving precursors of at least five transition metals in a solvent to prepare a metal precursor solution; the preparation method comprises the following steps: mixing a metal precursor solution with an organic ligand containing an organic functional group, a surfactant and an auxiliary bridging ligand, and carrying out solvothermal reaction to form coordination connection so as to obtain an organic metal framework template material; and calcining the organic metal framework template material in an oxygen atmosphere at the temperature of 1000 DEG C or below to obtain the nano high-entropy oxide material. The preparation method is simple, the calcining temperature is low, the energy consumption is low, the process is simple, and the prepared high-entropy oxide is single in phase, good in crystallinity, small in particle size and uniform in distribution, has rich metal catalytic active sites and can improve the utilization rate of active sulfur; meanwhile, the shuttle effect of polysulfide can be inhibited, and the electrochemical performance of the battery is improved. 本申请属于材料技术领域，尤其涉及一种纳米高熵氧化物材料及其制备方法，以及一种锂硫电池正极材料。包括步骤：将至少五种过渡金属的前驱体溶解在溶剂中，制得金属前驱体溶液；将金属前驱体溶液与含有有机官能团的有机配体、表面活性剂和辅助桥联配体进行混合处理后，进行溶剂热反应形成配位连接，得到有机金属框架模板材料；在温度为1000℃以下的氧气氛围中对所述有机金属框架模板材料进行煅烧处理，得到纳米高熵氧化物材料。煅烧温度低，能耗低，工艺简单，制得的高熵氧化物物相单一、结晶性好、粒径小且分布均匀，且具有丰富的金属催化活性位点，可提高活性硫的利用率；同时可抑制多硫化物的“穿梭效应”，提高电池的电化学性能。