A preparation method of lithium-site silver-copper-chromium co-doping synergistic nitrogen-sulfur-doped carbon coating modified barium lithium titanate negative electrode material

Abstract

The invention relates to a lithium-site silver copper chrome co-doped synergistic nitrogen-sulfur doped carbon-coated modified barium lithium titanate anode material. The method is characterized in that the method comprises the following steps: taking barium nitrate, lithium nitrate, silver nitrate, copper nitrate, chrome nitrate, nano-titanium dioxide, and graphene, ball grinding and mixing, then sintering the obtained powder in a muffle furnace, presintering at a constant temperature of 550 DEG C for 4 hours to decompose salts, followed by sintering at a temperature of 950 DEG C for 12 hours, and naturally cooling to room temperature to obtain lithium-site silver copper chrome co-doped barium lithium titanate; putting the obtained lithium-site silver copper chrome co-doped barium lithium titanate in a porcelain boat and putting in a tube-type atmosphere furnace, and then putting another porcelain boat containing thiourea in the tube-type atmosphere furnace in the upstream of air flow, using argon as a protective gas, treating at a temperature of 600 DEG C for 1 hour, naturally cooling to room temperature, taking out a product and grinding into powder to obtain the lithium-site silver copper chrome co-doped synergistic nitrogen-sulfur doped carbon-coated modified barium lithium titanate anode 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 silver-copper-chromium co-doped synergistically 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 dif...

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

Images