Method for preparing lithium magnalium co-doped synergic nitrogen-sulfur doped carbon-coated modified barium titanate lithium cathode material

Abstract

The invention relates to a method for preparing a lithium magnalium co-doped synergic nitrogen-sulfur doped carbon-coated modified barium titanate lithium cathode material. The method is characterized by comprising the following steps: mixing barium nitrate, lithium nitrate, magnesium acetate, aluminum acetate, nano titanium dioxide and acetylene black in a ball mill, sintering obtained powder in a muffle furnace, presintering for 4 hours at constant temperature of 650 DEG C to decompose salts, further sintering for 14 hours at 980 DEG C, and naturally cooling to the room temperature, so as to obtain lithium magnalium co-doped barium titanate lithium; putting the obtained lithium magnalium co-doped barium titanate lithium into a porcelain boat, putting into a tubular atmosphere furnace, putting another porcelain boat with cystine into the tubular atmosphere furnace, placing at upstream of air flow, treating for 2 hours at 680 DEG C in the presence of argon as a protection gas, naturally cooling to the room temperature, and grinding a product into powder, thereby obtaining a product, namely, the lithium magnalium co-doped synergic nitrogen-sulfur doped carbon-coated modified barium titanate lithium cathode material.

Description

technical field [0001] The invention relates to a barium lithium titanate negative electrode material for a lithium ion battery, in particular to a preparation method for a lithium-site magnesium-aluminum co-doped cooperative nitrogen-sulfur-doped carbon-coated modified barium lithium titanate negative electrode material. Background technique [0002] In recent years, my country has successively issued support policies for new energy vehicles, reflecting the country's emphasis on the development of new energy vehicles, especially electric vehicles. However, most electric vehicles in my country are equipped with lead-acid batteries. These batteries have low specific energy and short life. They often need to be scrapped and replaced after one year of use. Moreover, heavy metals such as lead and cadmium and sulfuric acid contained in batteries are harmful to the environment. The environment is seriously harmful, and the recycling technology of this type of battery is difficult, ...

AI Technical Summary

Problems solved by technology

It can be seen from this that BaLi 2 Ti 6 o 14 It is very suitable as an electrode material for lithium-ion batteries, but pure BaLi 2 Ti 6 o 14 It has the disadvantages of low electronic and ionic conductivity, so it is urgent to take effective measures to modify it to improve its electrochemical performance

[0005] Existing BaLi 2 Ti 6 o 14 The modification method of the negative electrode material is mainly to do the barium site with metal ions, including Ag + , Pb 2+ 、Al 3+ , La 3+ At the same time, surface silver coating was also tried. However, a single modification measure failed to effectively obtain high-performance barium lithium titanate, so that a high-power and long-life lithium-ion battery that can meet the current social needs cannot be obtained. Negative material

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