Lithium-sulfur battery anode material and preparation method thereof and lithium-sulfur battery

A technology for lithium-sulfur batteries and cathode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of reduced ion conductivity, battery performance attenuation, low battery capacity, etc., and suppress the increase of battery internal resistance , reduce battery capacity attenuation, and improve the effect of cycle performance

Inactive Publication Date: 2017-01-18
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] First, the electronic conductivity and ionic conductivity of elemental sulfur are poor, and the conductivity of sulfur materials at room temperature is extremely low (the conductivity is only 5.0×10 -30 S cm -1 ), the final product of the reaction Li 2 S 2 and Li 2 S is also an electronic insulator, which is not conducive to the high rate performance of the battery;
[0005] Second, lithium polysulfide, the intermediate discharge product of lithium-sulfur batteries, will dissolve into the organic electrolyte, increasing the viscosity of the electrolyte and reducing the ion conductivity.
Polysulfide ions can migrate between the positive and negative electrodes, resulting in the loss of active materials and a decrease in coulombic efficiency. In addition, due to the insulation of the deposited reaction products, further lead to battery performance degradation
[0006] Third, the final discharge product of lithium-sulfur batteries, Li 2 S n (n=1-2) Electronic insulation and insoluble in the e

Method used

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  • Lithium-sulfur battery anode material and preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery anode material and preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery anode material and preparation method thereof and lithium-sulfur battery

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[0052] like figure 1 Shown, the invention provides a kind of preparation method of lithium-sulfur battery cathode material, it comprises the following steps:

[0053] S1. Impregnation of cotton: first prepare a hydrochloric acid solution of zinc chloride with a mass fraction of 10%-50%, wherein the concentration of hydrochloric acid is 0.1mol / L-0.4mol / L. Take 5g of cotton and immerse in 150g of hydrochloric acid solution, keep it sealed at 20-100°C for 10-24h, then remove the excess solution, the weight of the mixture is 10-18 times the mass of cotton, and then dry the resulting mixture at 80-120°C for 1-5h . Then keep the product at 40-100°C for 5-50d to finally get a gray or brown solid.

[0054] S2. Preparation of porous carbon matrix: calcining the above solid at 450-850° C. for 30 min-10 h in a protective atmosphere (preferably nitrogen or argon). The calcined product is then heated in 0.2mol / L-5mol / L hydrochloric acid at 50-110°C for 0.5-5h, filtered, washed with deio...

Example Embodiment

[0061] Example 1

[0062] A preparation method for a lithium-sulfur battery positive electrode material, comprising the following steps:

[0063] S1. Cotton impregnation: first prepare a zinc chloride hydrochloric acid solution with a mass fraction of 10%, wherein the concentration of hydrochloric acid is 0.2 mol / L. Take 5g of cotton soaked in 150g of hydrochloric acid solution and keep it sealed at 70°C for 12h, then remove the excess solution. At this time, the weight of the mixture is 57.3g, and then dry the resulting mixture at 100°C for 2h. The product was then incubated at 65°C for 35 days to finally obtain a gray or brown solid.

[0064] S2. Preparation of porous carbon matrix: calcining the above solid at 550° C. for 1 h under the protection of argon. Then the calcined product was heated in 0.5 mol / L hydrochloric acid at 100°C for 2 hours, washed with deionized water and dried. Finally, the prepared product was dried at 80° C. for 4 hours, and calcined at 1000° C. f...

Example Embodiment

[0078] Example 2

[0079] A preparation method for a lithium-sulfur battery positive electrode material, comprising the following steps:

[0080] S1. Impregnation of cotton: first prepare a hydrochloric acid solution of zinc chloride with a mass fraction of 30%, wherein the concentration of hydrochloric acid is 0.2 mol / L. Take 5g of cotton soaked in 150g of hydrochloric acid solution and keep it sealed at 70°C for 12h, then remove the excess solution. At this time, the weight of the mixture is 78.5g, and then dry the resulting mixture at 100°C for 2h. The product was then incubated at 65°C for 1 d, and a gray or brown solid was finally obtained.

[0081] S2. Preparation of porous carbon matrix: calcining the above solid at 550° C. for 1 h under the protection of argon. Then the calcined product was heated in 0.5 mol / L hydrochloric acid at 100°C for 2 hours, washed with deionized water and dried. Finally, the prepared product was dried at 80° C. for 4 hours, and calcined at ...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery anode material, and relates to the technical field of lithium-sulfur batteries. The preparation method comprises the following steps of 1 cotton dipping , wherein cotton is soaked in a hydrochloric acid solution containing zinc chloride for sealed heat preservation, the redundant solution is removed, and a mixture is dried and subjected to heat preservation treatment to obtain gray or brown solids; 2 porous carbon matrix preparing, wherein carbonization treatment and acidification treatment are conducted on the solids in sequence, and then washing, drying and calcining are conducted to obtain a porous carbon matrix; 3 carbon-sulfur composite material preparing, wherein the porous carbon matrix and elemental sulfur are heated together to synthesize the lithium-sulfur battery anode material. The invention further discloses the lithium-sulfur battery anode material prepared through the method and a lithium-sulfur battery. Compared with the prior art, the lithium-sulfur battery anode material obtained through the method has the advantages of being high in sulfur loading amount and capacity, good in cycle performance, simple in process and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery positive electrode material, a preparation method thereof, and a lithium-sulfur battery comprising the lithium-sulfur battery positive electrode material. Background technique [0002] Lithium-sulfur battery is a secondary battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode. During discharge, the negative electrode reacts as lithium loses electrons and becomes lithium ions, and the positive electrode reacts as sulfur reacts with lithium ions and electrons to form sulfide. The potential difference of the negative electrode reaction is the discharge voltage provided by the lithium-sulfur battery. The specific energy of lithium-sulfur batteries can theoretically reach 2600Wh / Kg, which is much larger than any commercial secondary batteries used at this stage. In addition to the advantages of...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M10/052Y02E60/10
Inventor 武俊伟崔彦辉安德鲁·贝克
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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