Preparation method of lithium titanate negative electrode material

Abstract

The invention provides a preparation method of a lithium titanate negative electrode material. The preparation method comprises the specific steps of (1) preparing organic molecular solutions, stirring the solutions for later use, weighing an organic lithium source and a titanium source based on the mol ratio of Li to Ti of (0.80-0.85):1, respectively adding the weighed organic lithium source and titanium source to the organic molecular solutions to obtain a titanium-containing solution and a lithium-containing solution, simultaneously adding the titanium-containing solution and the lithium-containing solution to a reaction kettle containing a base solution, and stirring the solution to obtain a precursor solution containing flocculent precipitates; (2) after cooling the precursor solution to room temperature, separating out the precipitates in a filter pressing manner, washing the precipitates respectively with ethyl alcohol and distilled water, and drying the precipitates in a vacuum drying box to obtain a lithium titanate precursor; pressing the precursor into sheets with the thickness of 0.5-1.5 mm, burning the sheets in a muffle furnace, lowering the temperature of sheets to room temperature along with the temperature reducing of the furnace body, pneumatically pulverizing the sheets, and screening the pulverized sheets with a 300-mesh sieve to obtain the lithium titanate negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a preparation method of a lithium titanate negative electrode material. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery). It mainly relies on lithium ions to move between the positive and negative electrodes. It is a representative of modern high-performance batteries. Compared with traditional secondary batteries, lithium-ion battery energy High density, high average output voltage; small self-discharge, no memory effect; wide operating temperature range (-20°C ~ 60°C); excellent cycle performance, fast charge and discharge, high output power; no toxic and harmful substances. Therefore, it has been enthusiastically sought after by the market in recent years, and has become an ideal power source for portable tools such as mobile communication tools, notebook computers, and digital cameras, and it is also the pre...

AI Technical Summary

Problems solved by technology

The solid-phase method is relatively simple, but has inherent disadvantages, such as incomplete reaction, difficult control of product morphology, and wide particle size distribution.

The process of sol-gel method is relatively complicated, and agglomeration is easy to occur during the preparation process, and the required temperature is high. At the same time, the organic matter will produce a large amount of carbon dioxide gas during the sintering process.

Images