Preparation method for Ni-Co-Al-Mg oxide cladded carbon nanotubes for lithium ion battery

Abstract

The invention discloses a preparation method for Ni-Co-Al-Mg oxide cladded carbon nanotubes for a lithium ion battery. The preparation method comprises the following steps of: dissolving a nickel salt, a cobalt salt, a magnesium salt and an aluminum salt into water, and adding a slow controlled agent to prepare a mixed solution A; simultaneously adding the mixed solution A and a precipitating agent into a container for co-precipitation; carrying out purification, heat stabilizing and sub-high temperature treatment on the sediment to prepare the Ni-Co-Al-Mg oxide; mixing the Ni-Co-Al-Mg oxide and 2 wt% poly diallyldimethylammonium chloride (PDDA) aqueous solution, and subjecting the solution to ultrasound treatment; mixing the solution with a prepared carbon nano tube solution; and subjecting the solution to ultrasound treatment, and filtering and drying the solution to obtain the Ni-Co-Al-Mg oxide cladded carbon nanotubes for the lithium ion battery. The material has the advantages of high utilization rate, stable performance, excellent cycle performance and rate capability, no toxin and no harm to environment, and moreover, the preparation method is simple, is short in reaction time, low in cost and mild in condition, and is easy to control.

Description

Technical field: [0001] The invention relates to the field of lithium-ion batteries, in particular to a preparation method for carbon nanotube-coated nickel-cobalt-aluminum-magnesium oxides for lithium-ion batteries. Background technique: [0002] With the continuous deterioration of the earth's atmospheric environment, 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. The development and popularization of the special 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 special performance power lithium-ion batteries used for them can be used Cathode materials...

AI Technical Summary

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, the materials prepared by these technologies have unstable crystal lattices and poor electrochemical properties. Harmful substances are often released, and the prepared positive electrode material has poor conductivity, low ion diffusion coefficient, poor cycle performance and short service life