Preparation method of titanium-doped cobalt oxide

Abstract

The invention discloses a preparation method of titanium-doped cobalt oxide. The method comprises the following steps: adding a reaction base solution into a reaction kettle, and heating; adding a titanium-containing cobalt salt solution, a sodium hydroxide solution and an oxidizing agent into the reaction base solution in a parallel flow manner; controlling the pH value of the reaction system; stirring until the reaction is complete to obtain titanium-containing cobalt hydroxide slurry; sequentially carrying out aging, filtering, washing, drying and iron removal on the titanium-containing cobalt hydroxide slurry to obtain titanium-containing cobalt hydroxide powder; and calcining the titanium-containing cobalt hydroxide powder according to a temperature curve to obtain titanium-doped cobalt oxide. According to the invention, by doping titanium into cobalt oxide, the cycle performance of the cobalt oxide as a battery material is improved while the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of cobalt oxide preparation, and in particular relates to a preparation method of titanium-doped cobalt oxide. Background technique [0002] 3C electronic products are required to be light and compact, and the corresponding batteries need to have high energy density. Lithium cobaltate is currently the most important positive electrode material for 3C electronic products, and its energy density determines the energy density of lithium-ion batteries to a certain extent. High-voltage lithium cobalt oxide has the characteristics of high gram capacity and high voltage, and has higher energy density than conventional lithium cobalt oxide. It is the main direction of research and development of lithium cobalt oxide in the future. High-voltage lithium cobalt oxide is doped with certain metal elements in lithium cobalt oxide to improve the crystal structure stability of lithium cobalt oxide under high voltage, so th...

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Problems solved by technology

[0003] However, in the prior art, high-voltage lithium cobaltate is prepared by coating cobalt tetroxide doped in a coating manner, which will form lithium cobaltate without doping elements inside. The internal crystal structure is easy to collapse under high voltage, resulting in rapid capacity decay, and , the elements doped by this method are not easy to enter the crystal lattice of cobalt tetroxide, and a large part of the doping elements exist in the cobalt tetroxide powder in the form of mixture, which affects the charge and discharge performance of the battery