Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of metal oxide coated lithium-sulfur cathode material

A technology of positive electrode materials and oxides, which is applied in the field of preparation of lithium sulfur positive electrode materials, can solve the problems of easily damaged coating layer, affecting material performance, and long process cycle, so as to achieve easy coating uniformity, improve cycle performance, and not easy to fall off Effect

Inactive Publication Date: 2017-11-24
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this type of process are obvious: firstly, it is difficult for most coating materials to form a liquid phase, that is, there are fewer coatings to choose from in this method; secondly, in the process of firing after liquid phase coating, It is easy to damage the coating layer, causing defects in the coating; third, the coating process affects the performance of the material; fourth, the overall process cycle is long and the production efficiency is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh the titanium salt, zirconium salt and phosphorus-containing compound in a molar ratio of 0.4:1.8:4, dissolve the titanium salt and zirconium salt in 10 times distilled water, add the phosphorus-containing compound, adjust the pH4 and react for 2 hours, let stand for 8 hours, and then Filter, wash, and dry to obtain titanium zirconium phosphate. Wherein, the titanium salt can include at least one of titanium sulfate and titanyl sulfate; the zirconium salt can include at least one of zirconium sulfate or zirconium nitrate; the phosphorus-containing compound can include at least one of ammonium dihydrogen phosphate or diammonium hydrogen phosphate A sort of.

[0021] At a mass ratio of 10:1, sulfur and the above-mentioned zirconium and titanium phosphate were added to the solvent and ground for 10 hours, dried, and ground again for 50 minutes, and then calcined at 125 °C for 8 hours under inert gas, and then calcined at 300 °C for 10 hours to obtain lithium zirconium...

Embodiment 2

[0025] Weigh the titanium salt, zirconium salt and phosphorus-containing compound in a molar ratio of 0.4:1.8:4, dissolve the titanium salt and zirconium salt in 20 times distilled water, add the phosphorus-containing compound, adjust the pH to 6 and react for 3 hours, then let stand for 12 hours, then Filter, wash, and dry to obtain titanium zirconium phosphate. Wherein, the titanium salt can include at least one of titanium sulfate and titanyl sulfate; the zirconium salt can include at least one of zirconium sulfate or zirconium nitrate; the phosphorus-containing compound can include at least one of ammonium dihydrogen phosphate or diammonium hydrogen phosphate A sort of.

[0026] The sulfur and the above-mentioned zirconium and titanium phosphate were added to the solvent at a mass ratio of 10:2 and ground for 15 hours, then dried, and ground again for 150 minutes. Then, they were calcined at 145 °C for 10 hours under inert gas and then calcined at 350 °C for 15 hours to ob...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a metal oxide coated lithium-sulfur cathode material. The method is characterized in that titanium zirconium phosphate is used as a carrier; a self-discharging process of a battery can be effectively inhibited by a layered effect of the titanium zirconium phosphate, and sulfur particles are loaded in the titanium zirconium phosphate; a unique layered structure of the titanium zirconium phosphate tightly wraps the sulfur particles, so that the dissolution of polysulfide as a discharge intermediate product of the titanium zirconium phosphate can be effectively inhibited, and cyclic performance of a lithium-sulfur battery is improved. According to the preparation method disclosed by the invention, a coating material and a contact agent form a solid solution, so that uniform coating is easily realized; in addition, a mixed material is tightly combined after being sintered; a coating layer is not easy to fall off; by using the method, a production period is shortened, and the coating uniformity is ensured; the coating material also can form ideal glassy state coating by high temperature, and the performance of the material is further improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a preparation method of a metal oxide-coated lithium-sulfur positive electrode material. Background technique [0002] The new energy industry is an important development direction for improving energy shortage and environmental protection in the world. Lithium-ion batteries have received extensive attention due to their high operating voltage, no memory effect, low self-discharge, high energy density, and long cycle life. At present, lithium-ion batteries are mainly developed in the direction of high energy density, low production cost and high safety. [0003] The theoretical specific energy of a lithium-sulfur battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively), which is much larger than the current commercia...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/628H01M10/052Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD