Process for producing stephanoporate one-dimensional nano-cobaltic-cobaltous oxide

Abstract

The invention discloses a method for preparing porous one-dimensional nanometer cobaltosic oxide. The method comprises: a, synthetic step: at the room temperature, bivalent cobalt salt is mixed with a solution of urea, and the obtained mixed solution is heated up to a temperature of between 80 and 120 DEG C for reaction for 0.5 to 12 hours; b, filter-washing step: the synthetic solid product is filtered, washed and dried to obtain the dried cobalt hydroxide with nanometer structure; and c, calcination step: the product obtained by the filter-washing step is heated at a temperature of between 200 and 400 DEG C for 1 to 2 hours, and cooled down to the room temperature. Compared with the prior art, the method has the advantages that: the nanometer powder is uniform in size and good in dispersibility and cleanliness; only the cobalt source is used as a precursor, so that a crystal seed is unnecessarily added; the yield is high, the cost is low, the process flow is short, and the cobaltosic oxide prepared by the method has quite high specific surface area, and when the cobaltosic oxide is applied to the lithium ion battery, the performance of the battery can be greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a nanometer metal oxide, in particular to a preparation method of a porous one-dimensional nanometer cobalt trioxide which can be used as a raw material of lithium cobaltate, a cathode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, stable discharge, high-current discharge performance, high specific energy, no pollution, and good cycle performance. In recent years, the lithium-ion battery industry has become increasingly mature, so it is widely used in various products such as mobile phones, computers, and automobiles. With the continuous improvement of the performance of lithium-ion batteries, the research on cathode materials for lithium-ion batteries has also been put forward higher requirements. Cobalt tetroxide is an important raw material for the preparation of lithium cobalt oxide, the positive electrode material of lithiu...

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Problems solved by technology

However, the particle size distribution of the products prepared by the above several methods is uneven, easy to agglomerate, and the electrochemical performance is poor. After 10 cycles, the specific capacity is from 1000mAh / g to below 100mAh / g. Therefore, its industrialization is difficult.

[0005] 2. Precipitation method: mainly adopt cobalt salt and precipitant (sodium carbonate, ammonium oxalate, etc.) method, which discloses a technical scheme of using cobalt oxalate as the raw material for calcination and decomposing it into tricobalt tetroxide after three-step calcination. The temperature and equipment requirements for calcination are very high, which increases the production cost virtually, and the particle distribution of the product is uneven , it is difficult to meet the current requirements for battery performance improvement, which ultimately affects the industrialization of products

Although this method has obtained nano-one-dimensional cobalt tetroxide, the reaction time is long, and there are many types of raw materials introduced, and the particle size distribution is uneven.

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