a li(ni 0.8 co 0.1 mn 0.1 )o 2 Preparation method of ternary material

Abstract

A preparing method of a Li(Ni<0.8>Co<0.1>Mn<0.1>)O2 ternary material is provided. The preparing method includes 1) a step of preparing a LiAlO2 solution, 2) a step of preparing Li(Ni<0.8>Co<0.1>Mn<0.1>)O2, and 3) a step of material cladding. The ternary material prepared by the method has characteristics of high capacity density (not less than 180 mAh / g), excellent cycle performance (with discharge capacity after 500 times of cycling being not less than 95%), high safety performance, and the like, and is particularly suitable for the field of electric cars, and other fields.

Description

Technical field [0001] The invention relates to the field of lithium ion battery material preparation, in particular to prepare a high-cyclability ternary material through material coating. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have the characteristics of high specific capacity, long cycle life, and good safety. They are widely used as driving power sources for portable electrical appliances such as mobile phones and notebook computers. With the continuous upgrading of electronic products and the development of electric vehicles and hybrid vehicles, the requirements for battery energy density, service life, and safety performance continue to increase. [0003] The ternary cathode material has become the preferred material for lithium-ion batteries due to its high energy density, low price, and high cycle life. At present, the domestic preparation of ternary materials is mainly made by solid-phase sintering. For example, the patent C...

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Problems solved by technology

[0003] The ternary cathode material has become the preferred material for lithium-ion batteries due to its high energy density, low price, and high cycle life. At present, the ternary material is mainly prepared by solid-state sintering in China. For example, the patent CN102593442A points out: Using nickel-cobalt-manganese oxide and lithium carbonate with a specific median particle size, according to a certain calcination temperature and atmosphere to prepare a high-pressure lithium battery positive electrode material, but this method requires a narrow range of median particle size of raw materials, so that Its application has limitations; the patent CN103794753 A coats a layer of uniform vanadium oxide on the surface of the positive electrode material of the lithium ion battery, and this layer of oxide reduces the contact area between the positive electrode material and the electrolyte, and inhibits both due to The side reaction caused by direct contact improves the electrochemical performance of the positive electrode material, but its specific capacity is low, the cycle life is average, and it is difficult to popularize

Patent CN 104393277A discloses lithium-ion battery ternary materials coated with metal oxides on the surface and its preparation method. Due to the introduction of high-molecular polyacrylamide as a dispersant and flocculant, the uniform coating of ternary positive electrode materials can be achieved. Although the capacity has been improved, it is difficult to guarantee the safety performance of the battery

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