Method for preparing tritin tetraphosphide rivets for sodium ion negative electrode materials in carbon skeleton composite materials

Abstract

The invention provides a method for preparing a tritin tetraphosphide rivet used in a sodium ion negative electrode material in a carbon skeleton composite material, and the SnCl 4 ·5H 2 O was dispersed in deionized water and stirred, sodium citrate was added to the aqueous solution and stirred to form a mixed white suspension; the mixed white suspension was freeze-dried to obtain a white solid; Carry out carbonization treatment in a type furnace, and cool with the furnace; place the product and sodium hydrogen hypophosphite on both sides of the same quartz boat, and then cover with a quartz plate, and carry out phosphating under the condition of argon as a protective gas, using copper sulfate The solution is used to treat the waste gas, and the reactants are taken out, washed by centrifugation with absolute ethanol and deionized water, and dried in vacuum to obtain Sn 3 P 4 / C composite material. sn 4 P 3 The rivets are on the carbon skeleton, which improves the conductivity and prevents pulverization and falling off during the cycle, and is used as the negative electrode material of the sodium-ion battery.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanometer materials. Specifically, low-temperature phosphating of Sn / C is used to synthesize Sn 3 P 4 / C Composite. In particular, the invention relates to a method for preparing tritin tetraphosphide rivets on carbon skeleton composite materials for sodium ion negative electrode materials. Background technique [0002] In the industrial age, humans have carried out large-scale exploitation of fossil energy. Due to the low energy utilization rate, it has caused great waste of energy and environmental damage. Moreover, fossil energy is a one-time energy source. Unreasonable exploitation and use have caused energy pollution. Therefore, the development and use of green and renewable energy has become the development direction of the times, and energy storage materials have emerged as the times require. Since the end of the last century, lithium-ion batteries have been applied on a large scal...

AI Technical Summary

Problems solved by technology

The main problem is that the phase is difficult to synthesize. The current synthesis methods include high-speed ball milling, hydrothermal reaction, low-temperature phosphating, etc. The high-speed ball milling method is simple and easy, but it is difficult to control the morphology of the product; hydrothermal reaction can synthesize many Sn 3 P 4 , but in the phosphating process, hydrazine hydrate is generally used as the reaction solvent, and a long-term solvothermal reaction at a higher temperature has certain risks; low-temperature phosphating generally uses sodium hydrogen hypophosphite as the phosphorus source. The precursor is phosphated, and this phosphating method has certain selectivity for the precursor

In addition, since the radius of the sodium ion is A larger ionic radius causes serious volume changes in the material during the energy storage process, resulting in structural damage to the material after multiple cycles, and the greater the current density, the more serious the damage to the material

Jun Liu (JunLiu, bc Peter Kopold, b Chao Wu, b Peter A. van Aken, b Joachim Maierb and Yan Yu) and others synthesized the Sn core-shell structure 3 P 4 / C, although the hollow core-shell structure alleviates the volume change of the material during the cycle, and the coating of the carbon layer enhances the conductivity of the material, but hydrazine hydrate is generally used as the reaction solvent, and the hydrothermal reaction is carried out at 200 °C for a long time. Many potential safety hazards, so looking for a safe and reliable method to prepare high-capacity Sn 3 P 4 Materials are of great significance for the application of large-scale anode materials

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