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Preparation method of composite material for lithium-sulfur battery, and application of composite material

A composite material, lithium-sulfur battery technology, applied in the direction of lithium battery, electrolyte battery manufacturing, battery electrodes, etc., can solve the problems of lithium-sulfur battery discharge specific capacity decrease, battery cycle stability deterioration, restricting lithium-sulfur battery performance and other problems, Achieve fast and continuous long-distance electron transport, inhibit shuttle, and achieve the effect of long-distance electron transport

Inactive Publication Date: 2019-03-08
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing lithium-ion batteries are difficult to meet people's needs due to the limitation of theoretical specific capacity, and lithium-sulfur batteries with sulfur as the positive electrode have a high theoretical energy density (2600Wh / kg), and a theoretical specific capacity of 1675mAh / g, and sulfur Inexpensive, abundant resources, low toxicity, so it has become a favored secondary battery system with high energy density
[0003] However, there are still some key problems in lithium-sulfur batteries. First, the polysulfide ions Li produced during charging and discharging 2 S x (x=3~8) will dissolve in the electrolyte and migrate, resulting in a "shuttle" effect
The generation of the "shuttle" effect directly leads to the loss of active materials and the corrosion of the lithium negative electrode, which makes the battery cycle stability worse.
In addition, the insulation of elemental sulfur and its final discharge products, and the large volume change of the positive electrode during charging and discharging will lead to a decrease in the discharge specific capacity of lithium-sulfur batteries, which restricts the improvement of lithium-sulfur battery performance.

Method used

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  • Preparation method of composite material for lithium-sulfur battery, and application of composite material
  • Preparation method of composite material for lithium-sulfur battery, and application of composite material
  • Preparation method of composite material for lithium-sulfur battery, and application of composite material

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Experimental program
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Effect test

Embodiment 1

[0025] The first step: Fe 3 o 4 Preparation of / CC composites:

[0026] The mass percent was 20% Fe(NO 3 ) 3 9H 2 O and 2.5% PVP were dissolved in 20mL of DMF at a mass ratio of 1:1, and then a mixed solution was prepared by stirring vigorously at a temperature of 70°C (overall superficial flow velocity above 0.2m / s), and then at 20 At ℃, the solution was deposited on the carbon cloth substrate by the dip coating method, and the excess solution was removed. Finally, the modified carbon cloth was pyrolyzed in air at 600° C. for 2 hours.

[0027] The second step: the preparation of FeP / CC composite material:

[0028] The Fe prepared in the first step 3 o 4 / CC and NaHPO 2 were placed in two porcelain boats, the molar ratio of Fe and P was 1:20, and then the porcelain boats were placed in a tube furnace filled with NaHPO 2 The porcelain boat is placed near the end where the gas is introduced. Subsequently, the samples were heated at 300 °C for 2 h under a static argon ...

Embodiment 2

[0033] The first step: Fe 3 o 4 Preparation of / CC composites:

[0034] The mass percent was 25% Fe(NO 3 ) 3 9H 2 O and 5% PVP were dissolved in 20 mL of DMF at a mass ratio of 1:2, and then the mixed solution was prepared by stirring vigorously at a temperature of 80 °C, and then at 20 °C, the carbon cloth lining was coated by dip coating method. The solution was deposited on the bottom, and excess solution was removed. Finally, the modified carbon cloth was pyrolyzed in air at 800°C for 4 hours.

[0035] The second step: the preparation of FeP / CC composite material:

[0036] The Fe prepared in the first step 3 o 4 / CC and NaHPO 2 were placed in two porcelain boats, the molar ratio of Fe and P was 1:20, and then the porcelain boats were placed in a tube furnace filled with NaHPO 2 The porcelain boat is placed near the end where the gas is introduced. Subsequently, the samples were heated at 400 °C for 3 h under a static argon atmosphere, and then naturally cooled t...

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Abstract

The invention belongs to the technical field of the lithium-sulfur battery, and relates to a method for preparing a functionality interlayer through an active material, specifically a preparation method of the composite material for a lithium-sulfur battery and an application of taking the composite material as the lithium-sulfur battery functionality interlayer. The iron phosphate / carbon-cloth composite material (FeP / CC composite material) is prepared by utilizing a tubular furnace heating process; the prepared FeP / CC composite material is used as the functionality interlayer for a lithium-sulfur battery, the transmission rates of the electron and the ion are accelerated, the redox reaction of the lithium-sulfur battery in the charging / discharging process is promoted, the polysulfide is well adsorbed, and the shuttle effect of the polysulfide is restrained.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and relates to a method for preparing functional interlayers from active materials, in particular to a method for preparing composite materials for lithium-sulfur batteries and the application of the composite materials as functional interlayers for lithium-sulfur batteries. Background technique [0002] Lithium-ion secondary batteries have become the preferred power source for various electronic products due to their advantages such as high operating voltage, high energy density, long life and no memory effect. With the further miniaturization of electronic equipment and the rapid development of electric vehicles and large-scale energy storage power stations, people have put forward higher requirements for their power supplies. Existing lithium-ion batteries are difficult to meet people's needs due to the limitation of theoretical specific capacity, and lithium-sulfur batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/052H01M10/058
CPCH01M4/364H01M4/525H01M4/625H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 王新崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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