Method for synthesizing lithium sulfide/carbon composite material and lithium-sulfur battery using material

A technology of carbon composite materials and lithium sulfide, applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of low Li2S content in the composite, complicated preparation process, poor dissolution and conductivity, etc., and achieve easy realization and promotion, the preparation process and equipment are simple, and the effect of cheap raw materials

Inactive Publication Date: 2019-02-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the problems of dissolution and poor conductivity of lithium polysulfide, an intermediate lithium storage state, like sulfur cathode materials, Li 2 The main problems of S cathode materials are the sensitivity to moisture in the air and the difficulty of synthesis and preparation routes.
Most of the current synthetic routes can be divided into direct application of commercial lithium sulfide and chemical synthesis of lithium sulfide, but the cost is high, the preparation process is complicated, and the Li in the complex 2 The disadvantages such as low S content limit its practical application in lithium-sulfur batteries
[0005] The current lithium-free safe negative electrodes are mainly concentrated on materials with high specific capacity such as Si and Sn, but the problem of huge volume change during charging and discharging has not been fundamentally solved, and it cannot be directly commercialized.

Method used

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  • Method for synthesizing lithium sulfide/carbon composite material and lithium-sulfur battery using material
  • Method for synthesizing lithium sulfide/carbon composite material and lithium-sulfur battery using material
  • Method for synthesizing lithium sulfide/carbon composite material and lithium-sulfur battery using material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Prepare an aqueous solution of lithium sulfate monohydrate and glucose at a molar ratio of 2:1, heat and stir in a water bath at 80°C, then heat and dry in an oven at 80°C, and grind it into powder. 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 for 2h, then raise the temperature to 800°C at 10°C / min, keep it for 2h, The temperature was lowered to 350 °C at a rate of 10 °C / min in an air-protected atmosphere, and then cooled to room temperature with the furnace to obtain a lithium sulfide@porous carbon composite. attached figure 1 For the X-ray diffraction analysis of the lithium sulfide@porous carbon composite, it was determined that a pure phase of lithium sulfide was obtained. attached figure 2 Its high-power transmission electron microscope image shows that nano-scale lithium sulfide particles are evenly distributed in the carbon skeleton, and the ...

Embodiment 2

[0024] Prepare an aqueous solution of lithium sulfate monohydrate and glucose at a molar ratio of 1:1, heat and stir in a water bath at 80°C, then heat and dry in an oven at 80°C, and grind it into powder. 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 for 2h, then raise the temperature to 800°C at 10°C / min, keep it for 2h, The temperature was lowered to 350 °C at a rate of 10 °C / min in an air-protected atmosphere, and then cooled to room temperature with the furnace to obtain a lithium sulfide@porous carbon composite.

[0025] Match the capacity of positive and negative electrodes according to the ratio of 1.3:1 to assemble the battery. Put the installed battery on hold for 24 hours and then carry out the charge and discharge test: first use constant voltage (1.5V) to charge until the current value is less than 0.02C to stop, then use 0.05C to carry out consta...

Embodiment 3

[0027] Prepare an aqueous solution of lithium sulfate monohydrate and citric acid at a molar ratio of 2:1, heat and stir in a water bath at 80°C, then heat and dry in an oven at 80°C, and grind it into powder. 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 for 2h, then raise the temperature to 800°C at 10°C / min, keep it for 2h, The temperature was lowered to 350 °C at a rate of 10 °C / min in an air-protected atmosphere, and then cooled to room temperature with the furnace to obtain a lithium sulfide@porous carbon composite.

[0028] Match the capacity of positive and negative electrodes according to the ratio of 1.3:1 to assemble the battery. Put the installed battery on hold for 24 hours and then conduct a charge and discharge test: first use constant voltage (2V) to charge until the current value is less than 0.02C to stop, then use a current of 0.05C to carry...

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Abstract

The invention relates to a method for synthesizing lithium sulfide/carbon composite material by lithium sulfate and carbon sources in a heat treatment manner, and further relates to lithium-sulfur battery which takes the prepared lithium sulfide/carbon composite material as a positive-electrode material and graphite as a negative-electrode material. The method includes the steps: preparing water solution according to the mole ratio of the carbon sources to lithium sulphate monohydrate of (0.5-2):1, heating and stirring the water solution at the temperature of 60-100 DEG C, placing the water solution into a drying oven to heat and dry the water solution at the 60-100 DEG C, and grinding drying substances into powder; placing the powder prepared in the step (1) into the constant-temperaturearea of a tube furnace, heating the powder to reach the temperature of 500-700 DEG C in argon atmosphere, keeping the temperature for 0.5-4 hours, heating the powder to reach the temperature of 700-1000 DEG C at the speed of 2-10 DEG C/min, keeping the temperature for 0.5-4 hours, cooling the powder to reach the temperature of 300-350 DEG C at the speed of 5-10 DEG C/min in the protection atmosphere of argon, and cooling the powder to reach indoor temperature along with the tube furnace to obtain the lithium sulfide/carbon composite material synthesized by the lithium sulfate and the carbon sources.

Description

technical field [0001] The invention relates to a preparation method for synthesizing a lithium sulfide / carbon composite material by heat-treating lithium sulfate and a carbon source and a graphite-lithium sulfide full battery using the material as a positive electrode material, belonging 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 problem. 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 a key link, among which electrochemical energy storage 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 met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5815H01M4/625H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 师春生王宁赵乃勤何春年刘恩佐何芳马丽颖
Owner TIANJIN UNIV
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