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Anode material for lithium-sulfur rechargeable battery and preparation method of anode material

A technology for lithium-sulfur secondary batteries and positive electrode materials, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problem of low discharge specific capacity, achieve good electrochemical performance, high sulfur loading, and long service life long effect

Inactive Publication Date: 2019-05-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first discharge specific capacity at 0.5C current is 870.5mAhg -1 , after 100 cycles, the discharge specific capacity is 599.6mAhg -1 , but the research found that the material still has a low discharge specific capacity for the first time and after 100 cycles

Method used

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  • Anode material for lithium-sulfur rechargeable battery and preparation method of anode material
  • Anode material for lithium-sulfur rechargeable battery and preparation method of anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1

[0029] Crush the discarded durian shells collected from fruit shops and other places, cut them into small pieces, wash them with deionized water, and dry them in a blast drying oven with a temperature of 110°C for 12 hours. Pre-carbonize the dried product.

[0030] Due to the hard texture of durian shell, which is significantly different from mangosteen bark, electrochemical tests are required to determine its pre-carbonization temperature. A small amount of samples were taken for thermogravimetric testing (TGA). It was found that durian shells began to lose weight at a temperature of 170°C, and ended at a temperature of 700°C. The weight was almost stable, and the pre-carbonization temperature was determined to be 700°C.

[0031] The pre-carbonization temperature is set at 700° C., the reaction furnace is filled with nitrogen (purity above 99%), and the carbonization reaction time is 3 hours. Fully stir and mix the pre-carbonized product and potassium hyd...

Embodiment 2

[0037] Adopt the preparation method similar to embodiment 1, difference is:

[0038] (1) The temperature used for pre-carbonization is 400°C and the time is 7h;

[0039] (2) In potassium hydroxide activation, the mass ratio of potassium hydroxide to durian shell after pre-carbonization treatment is 3:1; the activation temperature is 700°C, and the activation time is 5h;

[0040] (3) The mass ratio of the activated carbon material carrier to the sulfur element is 4:6, and it is ground in a ball mill jar at a rotating speed of 200rpm, and the grinding time is 3h. The ground mixture is placed in a vacuum environment and heated at 140°C. Keep it warm for 24 hours, and cool to obtain the positive electrode material.

[0041] The positive electrode material obtained above was made into an electrode sheet by the same method as in Example 1 and then installed in a lithium-sulfur secondary battery. It has been verified that the positive electrode material has a high discharge specific...

Embodiment 3

[0043] Adopt the preparation method similar to embodiment 1, difference is:

[0044] (1) The temperature used for pre-carbonization is 800°C and the time is 1h;

[0045] (2) In potassium hydroxide activation, the mass ratio of potassium hydroxide to durian shell after pre-carbonization treatment is 5:1; the activation temperature is 1000°C, and the activation time is 1h;

[0046] (3) The mass ratio of the activated carbon material carrier to the sulfur element is 4:1, and it is ground in a ball mill at a rotating speed of 500rpm, and the grinding time is 0.5h. Keep the temperature for 6 hours, then cool to obtain the positive electrode material.

[0047] The positive electrode material obtained above was made into an electrode sheet by the same method as in Example 1 and then installed in a lithium-sulfur secondary battery. It has been verified that the positive electrode material has a high discharge specific capacity and service life.

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Abstract

The invention relates to an anode material for a lithium-sulfur rechargeable battery and a preparation method of the anode material. According to the specific method, biomass waste, namely a durian shell is adopted as a raw material, and after pre-carbonization, potassium hydroxide activation and other methods are adopted, an activated carbon material with an ultrahigh specific surface area and alarge pore volume is prepared; and the activated carbon material is used as a carrier, and a fused diffusion method is further adopted to prepare a carbon / sulfur composite. It is shown by an electrochemical test that the first discharge specific capacity, under a 0.5C current, of an anode prepared from the carbon / sulfur composite with sulfur capacity of 60wt.% is 1,074.23mAhg<-1>; after 100 timesof circulation, the discharge specific capacity of the anode is still 724.74mAhg<-1>; and the carbon / sulfur composite anode material, which is prepared by using the biomass waste, namely the durian shell as the raw material, has the advantages of being high in sulfur capacity, good in chemical stability, high in specific capacity, excellent in rate capability, simple in preparation method and thelike and can be well applied to the lithium-sulfur rechargeable battery.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a positive electrode material for a lithium-sulfur secondary battery and a preparation method thereof. Background technique [0002] Lithium battery is an ideal chemical energy recognized internationally today, and its small size and high voltage are widely used in portable electronic devices such as phones and computers. With the development of social economy, the rapid development of electric vehicles has brought huge development space and prospects for lithium batteries. Among the most widely used batteries at present, the theoretical energy density of lithium-ion batteries is about 500Wh kg -1 , The development at this stage is close to the theoretical value, and it is difficult to make further breakthroughs. Moreover, the large amount of precious metal cobalt in the positive electrode material is also a major problem in the development of lithium-ion batteries. A...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/052
CPCY02E60/10
Inventor 张存满谭研薛明喆李冰
Owner TONGJI UNIV
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