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Composite material for anodes of lithium sulfur batteries, method for manufacturing composite material and anodes and batteries which are made of composite material

A composite material and lithium-sulfur battery technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of electrode volume expansion, low S loading capacity of composite materials, and short cycle life of batteries. Achieve the effect of large surface area and increase S loading capacity

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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, lithium-sulfur batteries often use elemental sulfur or sulfur-based composite materials as the positive electrode of the battery, which has the following defects in use: (1) During the discharge process of the battery, the lithium polysulfide produced by the positive electrode of the battery is easily dissolved in the electrolyte , resulting in a short cycle life of the battery; (2) the S loading capacity of the composite material is not high; (3) the problem of electrode volume expansion is still relatively serious

Method used

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  • Composite material for anodes of lithium sulfur batteries, method for manufacturing composite material and anodes and batteries which are made of composite material
  • Composite material for anodes of lithium sulfur batteries, method for manufacturing composite material and anodes and batteries which are made of composite material

Examples

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Effect test

Embodiment 1

[0040] S11: Preparation of polynaphthalene

[0041] Put 4 g of dried 3,4,9,10-diphenyltetracarboxylic anhydride (PTCDA) in a tube electric furnace, and after three times of vacuuming and filling with argon, adjust the argon flow rate (25mL / min), The tail gas absorption device (absorbing liquid is saturated aqueous solution of calcium hydroxide), and then under the condition that the initial temperature is room temperature, the temperature is raised at a rate of 5°C / min, and the temperature is raised to 530°C, kept at this temperature for 8 hours, and then continued to The temperature was raised at a rate of 5°C / min, the temperature was raised to 1000°C, and maintained at this temperature for 6 hours, and then the temperature was naturally lowered to obtain polynaphthalene.

[0042] S12: Preparation of polynaphthalene / sulfur composites

[0043] 7.22g sodium thiosulfate is completely dissolved in 150mL high-purity water, then 0.5g of the obtained polynaphthalene is added to the...

Embodiment 2

[0049] S21: Preparation of polynaphthalene

[0050] Put 2 g of dried 3,4,9,10-diphenyltetracarboxylic anhydride (PTCDA) in a tube electric furnace, and after three times of vacuuming and filling with argon, adjust the argon flow rate (25mL / min), The tail gas absorption device (absorbing liquid is saturated aqueous solution of calcium hydroxide), and then under the condition that the initial temperature is room temperature, the temperature is raised at a rate of 5°C / min, and the temperature is raised to 530°C, kept at this temperature for 8 hours, and then continued to The temperature was raised at a rate of 5°C / min, the temperature was raised to 1100°C, and maintained at this temperature for 6 hours, and then the temperature was naturally lowered to obtain polynaphthalene.

[0051] S22: Preparation of polynaphthalene / sulfur composites

[0052] Dissolve 12g of sodium thiosulfate completely in 150mL of distilled water, then add 0.5g of the prepared polynaphthalene into the sodi...

Embodiment 3

[0058] S31: Preparation of polynaphthalene

[0059] The preparation method is the same as S11.

[0060] S32: Preparation of polynaphthalene / sulfur composites

[0061] In this step, the quality of sodium thiosulfate used is 18g, dissolved in 180mL of high-purity water, the quality of polynaphthalene used is 0.5g, the concentration of hydrochloric acid added dropwise is 12mol / L, and the volume is 23mL. The specific preparation steps are the same as S12, which will not be described in detail here.

[0062] S33: Preparation of porous titanium dioxide-wrapped polynaphthalene / sulfur composites

[0063] The preparation method is the same as S13.

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Abstract

The invention provides a composite material for anodes of lithium sulfur batteries. The composite material comprises polynaphthylene / sulfur composite materials and porous titanium dioxide. The porous titanium dioxide wraps the surfaces of the polynaphthylene / sulfur composite materials. The invention further provides a method for manufacturing the composite material for the anodes of the lithium sulfur batteries, and the anodes and the batteries which are made of the composite material for the anodes of the lithium sulfur batteries. The composite material for the anodes of the lithium sulfur batteries, the method, the anodes and the batteries have the advantages that the porous titanium dioxide wraps the surfaces of the polynaphthylene / sulfur composite materials, so that lithium polysulfide generated by the anodes when electricity of the batteries is discharged is difficult to dissolve in electrolyte; the S (sulfur) capacity of electrode materials can be greatly improved by the aid of the composite material for the anodes of the lithium sulfur batteries, and the high contents of sulfur in the polynaphthylene / sulfur composite materials can reach 65%-80%; polynaphthylene and the titanium dioxide are elastic to a certain extent and are combined with each other, so that double relief effects can be realized for volume expansion of the anodes.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular, to a composite material for positive poles of lithium-sulfur batteries, a preparation method, and positive poles and batteries made therefrom. Background technique [0002] Lithium-ion batteries are widely used in various mobile electronic devices such as notebook computers, cameras, mobile phones, and tablet computers. Due to the rapid development of mobile electronic devices, the requirements for specific capacity and specific energy of batteries are getting higher and higher. At present, commercial lithium-ion batteries cannot satisfy the limitations of their own theoretical capacity, so there is an urgent need to develop secondary batteries with high specific capacity and high specific energy. Lithium-sulfur batteries (theoretical specific capacity is 1675.0mAh / g, specific energy is 2500Wh / kg, 2800Wh / L) is considered to be one of the most promising high-energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/60H01M4/62H01M4/13H01M4/137H01M4/139H01M4/1399H01M10/0525
CPCH01M4/13H01M4/137H01M4/139H01M4/1399H01M4/362H01M4/38H01M4/602H01M4/62H01M10/0525Y02E60/10
Inventor 熊云奎廖维林陈飞彪
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