Method for preparing lithium-sulfur battery cathode Li2S/NCs composite material by activating and reducing lithium sulfate by using biomass wastes

A technology of biomass waste and composite materials, which is applied in the field of lithium-sulfur battery cathode material preparation, can solve problems such as environmental pollution and complicated preparation process, and achieve the effects of environmental friendliness, simple operation process and low raw material price

Active Publication Date: 2016-12-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to prepare a large amount of graphene and needs to activate graphene before the reaction, so the preparation process is relatively complicated; at the same time, the preparation of graphene process needs to consume a large amount of highly polluting activator (HNO 3 , H 2 SO 4 with P 2 o 5 ), causing environmental pollution

Method used

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  • Method for preparing lithium-sulfur battery cathode Li2S/NCs composite material by activating and reducing lithium sulfate by using biomass wastes
  • Method for preparing lithium-sulfur battery cathode Li2S/NCs composite material by activating and reducing lithium sulfate by using biomass wastes
  • Method for preparing lithium-sulfur battery cathode Li2S/NCs composite material by activating and reducing lithium sulfate by using biomass wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh bagasse powder (3.0g), Li 2 SO 4(1.0g) and urea (2.0g) were added to a round-bottomed flask filled with 50mL of water, mixed evenly, stirred magnetically in an oil bath at 80°C for 10 hours, and finally the obtained mixture was rotary evaporated at 55°C Remove excess water and move into magnetic boat;

[0030] (2) Send the magnetic boat into the tube furnace, feed nitrogen protective gas, heat the mixture to 800°C at a heating rate of 5°C / min and keep it warm at this temperature for 2 hours, then naturally cool to 100°C;

[0031] (3) The calcined material is ground in an anhydrous environment and stored under dry conditions.

[0032] Li got 2 The x-ray powder diffraction pattern (XRD) of the S / NCs composite is as figure 1 shown. Depend on figure 1 It can be seen that the reaction process of Example 1 has successfully generated Li 2 S, but the non-background miscellaneous peaks near 20 degrees show that there are still impurities in the product.

Embodiment 2

[0034] (1) Weigh bagasse powder (3.0g), Li 2 SO 4 (1.5g) and urea (2.0g) were added to a round-bottomed flask filled with 50mL of water, mixed evenly, stirred magnetically in an oil bath at 80°C for 10 hours, and finally the resulting mixture was rotary evaporated at 55°C Remove excess water and move into magnetic boat;

[0035] (2) Send the magnetic boat into the tube furnace, feed nitrogen protective gas, heat the mixture to 800°C at a heating rate of 5°C / min and keep it warm at this temperature for 2 hours, then naturally cool to 100°C;

[0036] (3) The calcined material is ground in an anhydrous environment and stored under dry conditions.

[0037] Li got 2 The x-ray powder diffraction pattern (XRD) of the S / NCs composite is as figure 1 shown. Depend on figure 1 It can be seen that the reaction process of Example 2 has successfully generated Li 2 S, and there is no obvious non-background impurity peak.

Embodiment 3

[0039] (1) Weigh bagasse powder (4.0g), Li 2 SO 4 (2.0g) and urea (2.0g) were added to a round-bottomed flask filled with 50mL of water, mixed uniformly, stirred magnetically in an oil bath at 80°C for 10 hours, and finally the resulting mixture was rotary evaporated at 55°C Remove excess water and move into magnetic boat;

[0040] (2) Send the magnetic boat into the tube furnace, feed nitrogen protective gas, heat the mixture to 800°C at a heating rate of 5°C / min and keep it warm for 2 hours at this temperature, and then naturally cool to 150°C;

[0041] (3) The calcined material is ground in an anhydrous environment and stored under dry conditions.

[0042] Li got 2 The x-ray powder diffraction pattern (XRD) of the S / NCs composite is as figure 1 shown. Depend on figure 1 It can be known that the reaction process of Example 3 has successfully generated Li 2 S, and there is no obvious non-background impurity peak.

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Abstract

The invention discloses a method for preparing a lithium-sulfur battery cathode Li2S/NCs composite material by activating and reducing lithium sulfate by using biomass wastes. According to the method of the invention, effective adjustment on specific surface area, overall pore volume, pore diameter, nitrogen content, Li2S particle size and Li2S content of the Li2S/NCs composite material is achieved by adjusting a proportion of Li2SO4 sources, the biomass wastes and nitrogen sources and controlling a heating rate and temperature during a calcining process. The method of the invention is simple and convenient in operation process, low in material price, environmental-friendly, and is a potential method for preparing the high-performance lithium-sulfur battery cathode material.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-sulfur battery cathode materials, in particular to lithium-sulfur battery cathode Li 2 Preparation of S / NCs composites. Background technique [0002] With the development of electric vehicles and portable electronic devices, the demand for rechargeable batteries with high energy density has increased dramatically, and the effective use of sustainable and clean energy such as wind energy, solar energy, and hydroelectric power also requires high-performance energy storage devices, and The development of traditional lithium-ion batteries has approached its theoretical energy density (510W h kg -1 ), while traditional lead / sulfur battery systems are too low in capacity and often fail to cycle adequately. Lithium-sulfur battery (Lithium-sulfur battery) is a new type of battery with S as the positive electrode active material. Due to its high theoretical energy density (2567W h kg -1 ), cheap an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/364H01M10/052Y02E60/10
Inventor 邓远富邹凯翔
Owner SOUTH CHINA UNIV OF TECH
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