Method for preparing Lithium transition metal composite oxides from carbonate propodosoma

Abstract

A method for preparing lithium transitional metal oxides, comprises the steps of: preparing a carbonate precursor using the following substeps: forming a first aqueous solution containing a mixture of at least two of the ions of the following metal elements (“Men+”): cobalt (Co), nickel (Ni), and manganese (Mn); forming a second aqueous solution containing ions of CO32−; and mixing and reacting the first solution and the second solution to produce the carbonate precursor, Ni1-x-yCoxMnyCO3; and preparing the lithium transition metals oxide from the carbonate precursors using the following substeps: evenly mixing Li2CO3 and the carbonate precursor; calcinating the mixed material in high temperature; and cooling and pulverizing the calcinated material to obtain the lithium transition metal oxide, Li Ni1-x-yCoxMnyO2.

Description

technical field [0001] The invention relates to a preparation method of a lithium transition metal composite oxide, in particular to the preparation of a carbonate precursor and a method for preparing a lithium transition metal composite oxide with excellent performance from the carbonate precursor. Background technique [0002] Known commercial lithium-ion batteries utilize lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), lithium manganese oxide (LiMn 2 o 4 ) and other transition metal composite oxides as cathode materials, especially LiCoO 2 application is the most common. Although LiCoO 2 has the best overall performance, but its price is higher and tends to increase with its scarcity, and even has the possibility of being exhausted. Therefore, at least two transition metal elements in cobalt (Co), nickel (Ni), and manganese (Mn) The synthetic research that is the lithium transition metal oxide of basic component has been paid close attention to by ...

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Problems solved by technology

[0003] The present inventors have found that although the product of method one is compared with the composite oxide prepared by thermal decomposition after mixing the salt or hydroxide of transition metal elements such as cobalt, nickel, manganese and lithium salt, it has better particle size distribution, density, Performance methods such as electrochemical capacity are better, but the intermediate product Ni 1-x-y CO X mn y (OH) 2 It is spherical and requires the particle size distribution of the ball to be narrow to obtain the above-mentioned excellent properties. This requires strict control of precipitation conditions, which is difficult in actual operation; the second method uses transition metals such as cobalt, nickel, and manganese. The element is mixed with the soluble salt of lithium, lye or carbonate in a spray manner to obtain a composite crystal, and then thermally decomposed to obtain the doped component LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , but this method is also difficult in operation, because Li 2 CO 3 volume close to 10 -3 , the solubility in water at room temperature is about 1 gram, and the step of washing the composite crystal to remove negative ions will inevitably lead to some Li 2 CO 3 The dissolution of the lithium content reduces the LiCoO 2 , LiNiO 2 , LiMn 2 o 4 formula metered product

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