Preparation method of Co-Mg-Mn oxide for lithium ion power battery and product

Abstract

The invention relates to a preparation method of a Co-Mg-Mn oxide for a lithium ion power battery. A co-precipitation method is adopted and the preparation method comprises the following steps of: (1) preparing a reaction solution; (2) carrying out purification treatment; (3) carrying out co-precipitation reaction; (4) removing impurities; and (5) carrying out heat stabilizing. Chemical precipitation reaction of a certain molar concentration of a cobalt salt, a magnesium salt and a manganese salt according to a certain proportion with a precipitator is carried out in a reaction kettle compatible with a radial flow and an axial flow under conditions of a certain temperature, a flow rate, a pH value, a stirring speed and the like and in a system of a mixture with the presence of a slow controlled agent to form an atomic-scale uniform mixture of cobalt hydroxide, magnesium hydroxide and manganese hydroxide for precipitation, and then low-temperature dehydration and high-temperature reconstitution are carried out to form the Co-Mg-Mn oxide, the formula of the Co-Mg-Mn oxide is Co<X>Mn<Y>Mg<Z>O4, wherein (X+Y+Z) is more than 0 but less than or equal to 3, X is more than 0, (X+Y) is more than 0 and less than 2, and Z is more than 0 but less than or equal to 0.1.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, in particular to a method for preparing cobalt-magnesium-manganese oxide for lithium power batteries and a product thereof. Background technique [0002] As people pay more and more attention to the development of new technologies and processes for clean energy and energy storage materials. Lithium-ion power batteries have attracted great attention due to their good characteristics such as high specific energy, high safety, and renewability. In particular, the development and popularization of the automobile industry among ordinary people around the world, in order to avoid the impact of the exhaust gas produced by gasoline vehicles on the atmosphere, provide a broad prospect for the development of electric vehicles, so that the positive electrode materials used for power lithium-ion batteries and The demand for its precursors will create great demand. [0003] At present, t...

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Problems solved by technology

According to the chemical mechanism of preparation, there are chemical precipitation method, electrochemical method, redox method, metathesis reaction and the combination of these mechanisms, etc. The stirring methods in the main reaction process include gas bubbling method, propulsion stirring method, external force damping method, etc. One or more kinds of additives in the preparation process include amino compounds, ammonium salts, etc., and one or more of them are used simultaneously. According to relevant data, these technologies are used in the preparation method of cobalt-magnesium-manganese oxide, the precursor of lithium-ion power battery cathode materials. There are the following problems in the application of : (1) the obtained material is due to the dislocation of transition metal cobalt ions and lithium ions and the crystal structure of manganese oxide changes repeatedly between the layered structure and the spinel structure during the charge and discharge process, thus Cause repeated expansion and contraction of the pole volume, leading to deterioration of battery cycle performance

And LiMnO 2 There is also the problem of dissolution at higher working temperatures, so the crystal structure is unstable during charging and discharging, and the lattice is easily deformed, so that other atoms, electrons, and ions are difficult or uneven to intercalate and detach, and the anti-overcharge and discharge performance is poor. The electrochemical performance of the material is unstable, the service life is short, and the safety is poor; (2) the preparation process produces ammonia (NH 3 ), ammonia nitrogen compounds (NH + ), etc.; (3) high production cost and high energy consumption

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