The advantages and disadvantages of cobalt is a cathode material LiCoO2 and improvement methods

Source: 2020 - 04 - 14 19:53 hits: the advantages and disadvantages of cobalt cathode material LiCoO2 and improvement methods are mainly by cobalt anode material LiCoO2, in 1980, scientists have proposed LiCoO2 as cathode material, it belongs to & alpha; Li ⁺ NaFeO2 hierarchical structure type, suitable for mobile and embedded, due to its layer structure is relatively stable, shows good electrochemical performance, due to its simple preparation process, so apply early, and LiCoO2 lithium ion battery cathode, the working voltage of the battery is in commonly more than 3. 6 V。 The theory of LiCoO2 capacity is 273 mah/g. LiCoO2 as cathode, of course, there are some defects, such as affected by its own structure, there is no guarantee that all the li ⁺ can reversibly/embedded reaction, especially in the repeated charge and discharge, the crystal structure of some of the changes and its capacity will be reduced, resulting in a decline in circulation performance and cobalt reserves, because the earth is less, the thermal stability is not very good, in the case of charging is not stable for environmental pollution, the production cost is high, the price is expensive. People are constantly looking for its substitutes, as well as continuously improve the performance of it. At present, the performance improvement of LiCoO2 method mainly mixed with some metal elements. As people will choose some transition metals, such as zinc, iron, chromium, nickel, manganese, titanium, etc. , and some transition metal magnesium, aluminum, calcium, strontium, and so on, in a particular way is LiCoO2 these according to the appropriate metal ions doped proportion, hold on the part of cobalt ions lattice position, after that, some metal ions can rise to the original structure of a more stable cobalt acid lithium, the influence of li's cell reaction process improve ⁺ not completely reversible embedding phenomenon, improve the cycle performance of lithium ion batteries; In addition, there are some metal ions can be more efficient, as much as possible to use the battery positive activity, make the capacity of the battery can be been improved to a certain extent; In addition, some metal ions can improve the electrical conductivity of the material. Although, of course, these metal elements doping can improve the performance of certain aspects of material, but also can reduce some other aspects of performance, fish and bear's paw do not have it, in addition, at present, this kind of technology or some difficulties, so the main work harder or LiCoO2 material itself and the production process, to make it function better, further reduce production costs.