A kind of preparation method of sulfur-containing electrode material

Abstract

The invention belongs to the field of lithium sulfur batteries, and particularly relates to a preparation method of a sulfur-containing electrode material. The preparation method comprises the following four steps: preparation of a sulfur-containing precursor, filling of the precursor, loading of a sulfur-containing component and drying of the sulfur-containing component. The preparation method comprises the following steps: firstly preparing a saturated solution of sulfur at the temperature of T1, then mixing with a porous component at the temperature of T2 (which is greater than or equal to T1), soaking the pore structure of the porous base material in the solution, then cooling the temperature to T3 (which is smaller than T1) so that the sulfur in the saturated solution is automatically separated out and at that time the separated sulfur becomes into nano-particles deposited in the pore structure of the porous base material by controlling the temperature and increasing disturbance to realize the filling of the pore structure of the porous base material through the sulfur-containing component; and then filtering to remove unnecessary solution, and drying to obtain a sulfur-carbon compound. In the process, the viscosity of the sulfur-containing component dissolved in the solvent is relatively low, the sulfur-containing component can easily permeate and enter the pore structure of the porous base material, so that deep micropores of the porous base material can be sufficiently filled; and therefore, the sulfur content of the obtained material is relatively high, and the capacity of a correspondingly obtained battery is relatively high.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a preparation method of a sulfur-containing electrode material. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought about revolutionary changes in this field, that is, after multiple charging and discharging efficiently and safely, they have been widely used in mobile phones, cameras, and notebooks. computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, better environmental friendliness, smaller self-discharge and longer battery life. It is an ideal power supply for mobile appliances, power supplies for electric vehicles, and storage appliances for power stations in the 21st century. [0003] However, with the improvement of life taste...

AI Technical Summary

Problems solved by technology

However, elemental sulfur itself is not conductive, and must be combined with a conductive substance to make an electrode, and the introduction of a conductive agent as a conductive component will lead to a significant reduction in the content of sulfur in the positive electrode coating, thereby reducing lithium. The energy density of sulfur batteries; at the same time, during the charging and discharging process of lithium-sulfur batteries, elemental sulfur will be converted into polysulfides, and polysulfides will dissolve in the liquid organic electrolyte, resulting in the loss of active materials during the cycle, which is more Seriously, the dissolved sulfide will precipitate on the negative electrode to form dendrites, which has a great risk of piercing the separator, resulting in extremely poor safety of the battery

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