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Preparation method of three-dimensional composite sulfur-lithium positive electrode material

A cathode material, carbon composite technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as the reduction of energy density of lithium-sulfur batteries, improve cycle and rate performance, improve electron ion transmission efficiency, and improve diffusion and penetration. Effect

Inactive Publication Date: 2017-10-20
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above-mentioned method of modifying the sulfur cathode material can improve the conductivity of the lithium-sulfur battery or improve its cycle performance, the energy density of the obtained lithium-sulfur battery is reduced. That is to say, this modification of the sulfur cathode material Sexual methods cannot improve the performance of lithium-sulfur batteries as a whole

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh the titanium salt, zirconium salt and phosphorus-containing compound at a molar ratio of 0.4:1.8:4, dissolve the titanium salt and zirconium salt in 10 times dedistilled water, add the phosphorus-containing compound, adjust the pH to 4, react for 2 hours, let it stand for 8 hours, and then Filter, wash and dry to obtain titanium zirconium phosphate. Among them, 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.

[0023] According to the mass ratio of 10:1, sulfur and the above-mentioned zirconium titanium phosphate were added to the solvent and ground for 10 hours, dried, 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 zirconi...

Embodiment 2

[0029] Weigh the titanium salt, zirconium salt and phosphorus-containing compound at a molar ratio of 0.4:1.8:4, dissolve the titanium salt and zirconium salt in 20 times dedistilled water, add the phosphorus-containing compound, adjust the pH to 6, react for 3 hours, let stand for 12 hours, and then Filter, wash and dry to obtain titanium zirconium phosphate. Among them, 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.

[0030] According to the mass ratio of 10:2, sulfur and the above-mentioned zirconium titanium phosphate were added to the solvent and ground for 15 hours, dried, ground again for 150 minutes, and then calcined at 145°C for 10 hours under an inert gas, and then calcined at 350°C for 15 hours to obtain zirc...

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Abstract

The invention discloses a preparation method of a three-dimensional composite sulfur-lithium positive electrode material. The method takes titanium zirconium phosphate as a carrier, and a self-discharging process of a battery can be effectively inhibited through a laminar effect; sulfur particles are loaded in the titanium zirconium phosphate; a unique laminar structure of the titanium zirconium phosphate tightly covers the sulfur particles, so that the dissolution of a discharging intermediate product polysulfide can be effectively inhibited, and the circulating performance of a lithium-sulfur battery is improved; a layered grade porous carbon material with a three-dimensional structure is used for covering, and the capacity of active components is improved by utilizing a mesoporous structure; the diffusion and permeation of electrolyte can be effectively improved through the three-dimensional structure, the transmission efficiency of electrons and ions is improved, and the circulation performance and rate performance of the positive electrode material are effectively improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing a three-dimensional carbon-composite sulfur-lithium cathode material. Background technique [0002] The new energy industry is an important development direction for the global improvement of energy shortage and environmental protection. 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 metallic 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 that of com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/58H01M4/62H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/581H01M4/587H01M4/628Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD