Preparation method for holmium-doped lithium nickelate material for lithium ion battery

Abstract

The invention discloses a preparation method for a holmium-doped lithium nickelate material for a lithium ion battery. The preparation method comprises the following steps of a), weighing materials base on stoichiometric ratio; b), adding absolute ethyl alcohol to a raw material, and performing ball milling and drying; c), adding acetate fibre, potassium chloride and sodium chloride mixed fused salt, and absolute ethyl alcohol to the raw material prepared in the step b, and performing ball milling and drying; and d), sintering the raw materials processed in the step c, then cooling after completing sintering, and next, cleaning by clean water and drying to obtain the holmium-doped lithium nickelate material. The holmium-doped lithium nickelate material for the lithium ion battery has higher discharge capacity and capacity per gram; the holmium-doped lithium nickelate material adopts a hollow tubular structure; after the holmium-doped lithium nickelate material is further processed, the tube wall is more loosened, so that the volume expansion in the charge-discharge process can be relieved; and in addition, inorganic filler, which refers to titanium dioxide, in the acetate fibre is doped into crystal lattices of the holmium-doped lithium nickelate material so as to improve the stability of the holmium-doped lithium nickelate material and reduce the capacity attenuation problem of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for preparing a holmium-doped lithium nickelate 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 hi...

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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.