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Heterojunction nano material diaphragm used for lithium-sulfur battery as well as preparation method thereof

A nanomaterial, lithium-sulfur battery technology, applied in the direction of lithium batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problems of low utilization rate of active materials, difficulty in commercialization, shuttle effect dynamics, etc., to achieve easy Effects of generalization, good kinetics and electrochemical performance, cheap raw materials

Active Publication Date: 2019-06-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, elemental sulfur is a very attractive positive electrode active material for secondary lithium batteries, but the sulfur positive electrode faces the problems of lithium polysulfide shuttle effect and slow kinetics during battery operation, resulting in low utilization of active materials. Poor cycle performance, difficult to achieve commercialization
Modification of the separator by adding a layer of material as a barrier layer is an effective method, but the efficiency of traditional carbon materials as a barrier layer is low

Method used

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  • Heterojunction nano material diaphragm used for lithium-sulfur battery as well as preparation method thereof
  • Heterojunction nano material diaphragm used for lithium-sulfur battery as well as preparation method thereof
  • Heterojunction nano material diaphragm used for lithium-sulfur battery as well as preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Glucose and cobalt sulfate were formulated into an aqueous solution at a mass ratio of 0.25:1, and then sprayed into a dry powder at 150°C by spray drying. Place the obtained powder in the constant temperature zone of the tube furnace, raise the temperature to 600°C at 10°C / min under 200ml / min argon atmosphere, keep it warm for 2h, cool down to 350°C at a rate of 10°C / min, and then cool with the furnace to room temperature, the cobalt sulfide / cobalt oxide heterojunction is obtained. The prepared heterojunction nanomaterials and graphene were uniformly dispersed in ethanol, covered on the surface of the diaphragm by suction filtration, and dried at 60°C to obtain a multifunctional diaphragm with a modified layer. The thickness of the modification layer is 1-20 μm.

[0022] attached figure 1 It is the thermogravimetric curve of the precursor obtained by spraying. It can be found that the range of 50-400 °C is the decomposition range of glucose, and the process of carbot...

Embodiment 2

[0024] Glucose and cobalt sulfate were formulated into an aqueous solution at a mass ratio of 0.3:1, and then sprayed into a dry powder at 150°C by spray drying. Place the obtained powder in the constant temperature zone of the tube furnace, raise the temperature to 600°C at 10°C / min under 200ml / hydrogen atmosphere, keep it warm for 2h, cool down to 350°C at a rate of 10°C / min, and then cool to room temperature with the furnace , that is, cobalt sulfide / cobalt oxide heterojunction nanomaterials are obtained. The prepared heterojunction nanomaterials and graphene were uniformly dispersed in ethanol, covered on the surface of the diaphragm by suction filtration, and dried at 60°C to obtain a multifunctional diaphragm with a modified layer. The thickness of the modification layer is 1-20 μm.

Embodiment 3

[0026] Glucose and nickel sulfate were formulated into an aqueous solution at a mass ratio of 0.25:1, and then sprayed into a dry powder at 150°C by spray drying. Place the obtained powder in the constant temperature zone of the tube furnace, raise the temperature to 600°C at 10°C / min under 200ml / argon atmosphere, keep it warm for 2h, cool down to 350°C at a rate of 10°C / min, and then cool with the furnace to At room temperature, nickel sulfide / nickel oxide heterojunction nanomaterials are obtained. The prepared heterojunction nanomaterials and graphene were uniformly dispersed in ethanol, covered on the surface of the diaphragm by suction filtration, and dried at 60°C to obtain a multifunctional diaphragm with a modified layer. The thickness of the modification layer is 1-20 μm.

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Abstract

The invention relates to a diaphragm used for a lithium-sulfur battery. The diaphragm comprises a diaphragm basal body and a modification layer covering the diaphragm basal body, and the diaphragm ischaracterized in that the modification layer adopts a graphene and heterojunction nano composite, wherein a heterojunction nano material is of a two-phase composite structure, the interior is a high catalytic phase, an outer layer is a strong adsorbed phase, the high catalytic phase is at least on of cobalt sulfide, nickel sulfide and iron sulfide, and the adsorbed phase is at least one of cobaltoxide, nickel oxide and iron oxide. The invention also provides a preparation method of the diaphragm. The prepared diaphragm can be used for making a lithium-sulfur battery with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries. Background technique [0002] Solving the consumption of fossil fuels and the ensuing environmental pollution has become a global issue. Therefore, it is imminent to adjust the energy structure and use clean energy such as solar energy and wind energy. The matching energy storage technology is the key link to realize the efficient utilization of clean energy, and the electrochemical energy storage technology represented by lithium-ion batteries has great potential. [0003] The theoretical specific capacity of traditional lithium-ion battery cathode materials is less than 300mAh g -1 , the actual energy density is less than 200Wh·kg -1 , its battery life can not meet the needs of the market. Elemental sulfur can be matched with metal lithium, and the theoretical specific capacity is as high as 1675mAh g -1 , the theoretical energy density can reach 2600Wh·kg -1 , and is rich...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCY02E60/10
Inventor 师春生王宁赵乃勤刘恩佐何春年何芳
Owner TIANJIN UNIV
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