Preparation method of lithium cobalt oxide

Abstract

The invention discloses a preparation method of lithium cobalt oxide. The preparation method of the lithium cobalt oxide solves the problems that an existing preparation method of the lithium cobalt oxide is high in temperature, the lithium cobalt oxide obtained through the existing preparation method is uneven in particle, the agglomeration phenomenon exists, the high temperature process causes uneven content of cobalt and lithium in materials and leads to the lithium element to be separated out. The preparation method of the lithium cobalt oxide includes the following steps of weighting out a certain amount of lithium salt, measuring water-solubility organics based on the molar weight of the lithium salt according to the ratio that the total molar weight of the water-solubility organics is 50%-70% of the molar weight of the lithium salt, mixing the water-solubility organics and the lithium salt, adding water to mixture, conducting ball-milling, obtaining pre-reaction slurry, adding materials with cobalt and water to the pre-reaction slurry wherein the molar ratio of the lithium to the cobalt is 0.95-1.2: 1, conducting the ball-milling, obtaining reaction slurry, drying the reaction slurry, calcining the slurry, and obtaining the lithium cobalt oxide. The preparation method of the lithium cobalt oxide has the advantages that the lithium cobalt oxide obtained through the preparation method is good in evenness, small in crystal particle, even in particle size, and less in agglomeration. In addition, the preparation method of the lithium cobalt oxide has the advantages of being simple in technology process, appropriate for large batch production, low in calcination temperature and the like.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a preparation method of lithium cobalt oxide. Background technique [0002] Among the currently commercialized cathode materials for lithium-ion batteries, lithium cobalt oxide (LiCoO 2 ) Due to the relatively stable electrochemical performance, good cycle performance, high voltage platform, and good compatibility with the electrolyte, the compaction density of the positive electrode diaphragm can reach 4.1g / cm 3 , and does not affect battery performance and is widely used as a positive electrode active material for lithium-ion batteries. [0003] At present, the traditional batch preparation of lithium cobalt oxide mostly adopts a simple high-temperature solid-phase process, and LiCoO is formed by material diffusion at high temperature. 2 The crystal requires high temperature, the particle size of the product is large, the particles are une...

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Problems solved by technology

[0005] The present invention aims to solve the problem that the lithium cobalt oxide preparation method in the prior art has a high temperature, and the obtained lithium cobalt oxide has a large particle size, uneven particles, and agglomeration phenomenon, and it is easy to cause uneven distribution of cobalt and lithium content in the material during the high temperature process. Uniformity or even lead to the problem of lithium element precipitation, provides a simple process steps, low preparation temperature, the prepared lithium cobalt oxide particle size is small, uniform particles, which can effectively avoid the uneven distribution of cobalt and lithium content and lithium element in the preparation process. The preparation method of lithium cobaltate of precipitation phenomenon, the lithium cobaltate obtained by this method has good cycle stability

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