Tricobalt Tetraoxide CAS 1308-06-1

The rapid development of the lithium-ion battery industry has driven the development of its cathode materials such as lithium cobaltate and other cobalt-based cathode materials, so the demand for cobalt-based cathode materials for lithium-ion batteries has also increased significantly. Cobalt tetroxide is the raw material of lithium cobaltate, the positive electrode material of lithium ion batteries. At present, cobalt tetroxide is generally prepared by using cobalt salt and hydroxide in a reaction kettle to prepare cobalt hydroxide particles, and then by calcining in a calciner to make cobalt hydroxide The particles react with oxygen in the air to produce spherical cobalt tetraoxide.

However, in the calcination stage, the cobalt hydroxide particles and the air that are introduced are relatively static, and the contact degree between the surface material and the internal material and the air is different, so there will be uneven oxidation. The surface material is easy to form tricobalt tetroxide, while the internal material It is prone to incomplete oxidation, and even some cobalt hydroxide particles have not been converted into cobalt oxide, so that the purity of the final spherical cobalt tetroxide is relatively low. The purity of the current finished product is generally about 95% on average, and the maximum is not more than 98%, the specific capacity of the produced lithium cobalt oxide is only about 145mAh/g, and the capacity of the produced battery is relatively small.

Because the purity of tricobalt tetroxide will directly affect the size of the specific capacity of lithium cobaltate, and ultimately affect the size of the battery capacity, how to reduce the content of cobalt hydroxide in the tricobalt tetroxide as much as possible, and improve the purity of tricobalt tetroxide is an urgent need for those skilled in the art at present Solved technical problems.

CN201210486483.1 provides a preparation method of doped spherical cobalt tetroxide to solve the problem that the purity of cobalt tetroxide prepared by the current preparation method of tricobalt tetroxide is low, which affects the electrochemical performance of the battery. Include the following steps:

1. Prepare a mixed doping solution, doping element ions into the cobalt salt solution to form a mixed doping solution.
2. Configure the hydroxide solution.
3. Feeding, the doping mixed solution, hydroxide solution and air are passed into the reaction device at the same time, and the reaction is continuously stirred for 5-20 hours to prepare a doped spherical cobalt tetroxide suspension solution.
4. Filtration, filtering the doped spherical cobalt tetroxide suspension solution to prepare a doped spherical cobalt tetroxide semi-finished product.
5. Washing and drying, washing and drying the doped spherical cobalt tetroxide semi-finished product to obtain the finished doped spherical cobalt tetroxide.