Preparation method and purpose thereof of spherical ferriferrous oxide nano particles with controllable size

Abstract

The invention discloses a preparation method of spherical ferriferrous oxide nano particles with controllable size, which is characterized in that sodium oleate is taken as a synthesis auxiliary agent and a surfactant, a hydrothermal method is used for one-step preparation in a glycol system. The method comprises the following steps: dissolving soluble ferric salt and a certain amount of sodium oleate in glycol, stirring for more than 2 hours; then sealing the mixed liquor in a polytetrafluoroethylene lined high-pressure reaction vessel, cooling and then centrifuging and washing to obtain the spherical ferriferrous oxide nano particles. According to the invention, the technology is more reliable and has the advantage of high repeatability, only sodium oleate used in a system is taken as a reaction auxiliary agent, and the particle size of the spherical ferriferrous oxide can be regulated and controlled by adjusting the addition of sodium oleate. The prepared ferriferrous oxide has a grading structure, the process is easily controlled and realized, and the preparation method has the advantage of friendly environment. The prepared spherical particles of ferriferrous oxide can be used as a lithium ion battery cathode material, the experiment shows that the spherical particles have excellent cycle performance and good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer metal oxide functional materials, and in particular relates to a preparation method of size-controllable spherical iron ferric oxide nanoparticles. Background technique [0002] Lithium-ion batteries are widely used in electronic products and electric vehicles due to their high voltage and energy density. Lithium-ion batteries are mainly composed of positive electrode, diaphragm, negative electrode and electrolyte. The current main commercial negative electrode material is graphite, but graphite material is due to its low specific capacity (372 mAhg -1 ), has become a factor limiting the energy density of lithium-ion batteries, so the development of a higher-capacity lithium-ion battery anode material has become a current research hotspot. Due to the high theoretical capacity of transition metal oxides (generally greater than 600 mAhg -1 ), higher safety, and no pollution have become an ...

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Problems solved by technology

However, the systems used in the above-mentioned preparation methods are relatively complex, and have certain requirements on the valenc

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