A kind of preparation method of terbium-doped lithium manganese oxide material for lithium ion battery

Abstract

The invention discloses a preparation method of a terbium-doped lithium manganate material for a lithium ion battery. The method comprises the following steps: (a) weighing lithium carbonate, manganese oxide and terbium oxide according to a stoichiometric ratio; (b) adding anhydrous ethanol into the raw materials weighed in the step a, carrying out ball milling, then taking out the product and drying to obtain a terbium-doped lithium manganate raw material; (c) adding acetate fiber and mixed molten salt of potassium chloride and sodium chloride into the terbium-doped lithium manganate raw material obtained in the step b, adding the anhydrous ethanol into the obtained mixture, carrying out ball milling and then drying; (d) sintering the raw material treated in the step c, cooling after sintering, washing the obtained powder with water, and drying to obtain the terbium-doped lithium manganate material. The terbium-doped lithium manganate material for the lithium ion battery has higher discharge capacity; the terbium-doped lithium manganate material has a hollow tubular structure and is loose in tube wall, thus relieving the problem of volume expansion caused in charging and discharging processes; the stability of the terbium-doped lithium manganate material is improved by using inorganic filler titanium dioxide in the acetate fiber.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a preparation method of a terbium-doped lithium manganate material 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 hig...

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.