Method for preparing europium-doped lithium cobalt oxides for lithium ion battery

Abstract

A method for preparing europium-doped lithium cobalt oxides for a lithium ion battery includes the following steps that firstly, lithium carbonate, cobaltous oxide and europium oxide are weighed according to the stoichiometric ratio; secondly, anhydrous ethanol is added into the raw materials weighed in the first step, ball milling is conducted, the mixture is taken out and dried, and an europium-doped lithium cobalt oxide raw material is obtained; thirdly, acetate fiber and potassium chloride-sodium chloride mixed molten salt are added into the europium-doped lithium cobalt oxide raw material prepared in the second step, then anhydrous ethanol is added, ball milling is conducted, and then drying is conducted; fourthly, the raw materials processed in the third step are sintered and then cooled, obtained powder is washed with water and dried, and europium-doped lithium cobalt oxides are prepared. The europium-doped lithium cobalt oxides for the lithium ion battery have higher discharge capacity and gram volume and are of a hollow tubular structure, the pipe wall is of a loose structure, the volume expansion problem in the charging and discharging process can be relieved, and circulation performance of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a preparation method of europium-doped lithium cobaltate for lithium-ion batteries. Background technique [0002] Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high working voltage, fast charging speed, wide working temperature range, long cycle life, small size, light weight, green and pollution-free, etc. At present, it has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application scope is becoming more and more extensive. The rapid development of new digital electronic products has put forward more and more demands on the energy density and high reliability of lithium-ion batteries. high demands. [0003] Like other secondary batteries, the positive electrode material also occupies a very high position...

AI Technical Summary

Problems solved by technology

[0003] Like other secondary batteries, the positive electrode material also occupies a very high position in the lithium-ion battery. Together with the negative electrode material, it determines the performance of the lithium-ion battery. Traditional lithium-ion batteries often use lithium cobalt oxide, lithium manganese oxide, and lithium nickel oxide. Or lithium-containing materials such as nickel-cobalt lithium manganese oxide are used as positive electrode materials for lithium-ion batteries. Recently, lithium iron phosphate materials have increasingly become the focus of attention, but these lithium-ion battery positive electrode materials still have some defects, such as discharge capacity. It can be objectively improved, but the gram capacity is still small, which greatly limits the growth of the finished product capacity of lithium-ion batteries, and also limits the development of lithium-ion batteries to miniaturization and miniaturization; limits the development of lithium-ion powered vehicles, and in the future Under the premise of increasing the self-weight of electric vehicles, the mileage of electric vehicles increases slowly, or even difficult to increase; it also limits the endurance of mobile devices such as mobile phones. The battery puts forward higher requirements. When it needs to meet the requirements of smaller size and larger capacity, it is difficult for the existing lithium-ion batteries to meet similar requirements.