Method for preparing Li-S battery anode materials by taking algae as carbon source

A battery positive electrode and algae technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity of elemental sulfur, loss of sulfur positive electrode, low battery cycle performance and coulombic efficiency, and achieve low cost, convenient material acquisition, and improved The effect of electrochemical performance

Inactive Publication Date: 2016-11-09
HANGZHOU DIANZI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, at present, there are still two major obstacles in the technology of Li-S batteries that have not been completely resolved: (1) the conductivity of elemental sulfur is poor; (2) the "shuttle effect" will cause the loss of the sulfur cathode, which will lead to the loss of the battery's cycle performance and Coulombic performance. low efficiency

Method used

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  • Method for preparing Li-S battery anode materials by taking algae as carbon source
  • Method for preparing Li-S battery anode materials by taking algae as carbon source

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 10g of dried brown algae and dissolve it in 200ml of deionized water, and add KOH, a strong alkali substance with a purity of 99.5% of analytical purity and a mass percentage of 99.5%, at a mass ratio of 1:0.1, and stir until the brown algae is completely dissolved in water to obtain a fucoidin solution , freeze-dry it for 10 hours and then transfer it to a tube furnace. After the tube furnace is evacuated, high-purity argon gas with a mass percentage of 99.99% is introduced. The flow rate of the gas is controlled at 20ml / min. Raise the temperature of the tube furnace to 1000°C at a heating rate of 1 / min, and hold for 5 hours.

[0023] The product obtained by the above-mentioned calcination was washed repeatedly, suction filtered until the pH value was neutral, and dried at 60°C. The dried product obtained was placed in a vacuumed tube furnace, and the high Pure argon, the flow rate of the gas is controlled at 20ml / min, and the temperature of the tube furnace is r...

Embodiment 2

[0026] Weigh 15g of dried green algae and dissolve it in 450ml of deionized water, add a strong base substance KOH with a purity of 99.5% for analytical purity at a mass ratio of 1:0.5, and stir until the green algae is completely dissolved in water to obtain green algae. The alginate solution was transferred to the tube furnace after it was freeze-dried for 24 hours. After the tube furnace was evacuated, the high-purity argon gas with a mass percentage of 99.99% was introduced, and the flow rate of the gas was controlled at 30ml / min. The temperature of the tube furnace was raised to 800°C at a heating rate of 4°C / min and kept for 2h.

[0027] The product obtained by the above-mentioned calcination was repeatedly washed, suction-filtered until the pH value was neutral, and dried at 80°C. Pure argon, the gas flow rate is controlled at 30ml / min, the temperature of the tube furnace is raised to 1200°C according to the heating rate of 7°C / min, and the insulation is 3h to obtain th...

Embodiment 3

[0030] Weigh 20g of dried red algae and dissolve it in 1000ml of deionized water, add KOH, which is analytically pure and has a mass percentage of 99.5%, in a mass ratio of 1:1, and stir until the red algae is completely dissolved in water to obtain red algae. The alginate solution was transferred to the tube furnace after it was freeze-dried for 48 hours. After the tube furnace was evacuated, the high-purity argon gas with a mass percentage of 99.99% was introduced, and the flow rate of the gas was controlled at 50ml / min. The temperature of the tube furnace was increased to 500°C at a heating rate of 3°C / min and kept for 1h.

[0031] The black product obtained by the above-mentioned calcination was washed repeatedly, filtered with suction until the pH value was neutral, and dried at 100°C. High-purity argon gas, the flow rate of the gas is controlled at 50ml / min, and the temperature of the tube furnace is raised to 1400°C at a heating rate of 6°C / min, and kept for 5 hours to ...

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Abstract

The invention discloses a method for preparing Li-S battery anode materials by taking algae as a carbon source. The key point of the method is that the algae is dissolved by alkaline solution, a porous carbon structure rich in nitrogen is formed after high-temperature carbonization treatment, the porous carbon structure and subliming elemental sulfur are subjected to ball milling mixing, and a C / S compound material is obtained through high-temperature recrystallization and is used for the Li-S battery anode material. The material has stable electrochemical performance. The method has the advantages of environment protection, convenience and quickness in material obtaining, and low cost and is especially suitable for preparing the Li-S battery anode material.

Description

technical field [0001] The invention belongs to the field of electrode preparation in new energy conversion and storage, and in particular relates to a method for preparing Li-S battery cathode materials by using algae as a carbon source. Background technique [0002] With the rapid development of the world economy, the demand for energy is increasing day by day, and the demand for developing alternative new energy and renewable clean energy is becoming increasingly urgent. Secondary batteries represented by nickel-metal hydride batteries, lead-acid batteries, lithium-ion batteries, and lithium-sulfur batteries are important ways and means of alternative energy sources. Compared with other electrode materials, elemental sulfur is low in cost, abundant in reserves, and environmentally friendly. After forming a lithium-sulfur (Li-S) battery with lithium metal, its theoretical energy density is as high as 2567Wh / kg, and its specific capacity is also as high as 1672mAh / g (for 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587
CPCH01M4/587Y02E60/10
Inventor 易鑫武军徐军明宋开新胡冀邵李焕
Owner HANGZHOU DIANZI UNIV
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