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Composite material for positive electrode of lithium-sulfur battery, preparation method, positive electrode and battery made therefrom

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

Active Publication Date: 2017-10-20
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 positive electrode of lithium-sulfur battery, preparation method, positive electrode and battery made therefrom
  • Composite material for positive electrode of lithium-sulfur battery, preparation method, positive electrode and battery made therefrom

Examples

Experimental program
Comparison scheme
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 positive electrodes of a lithium-sulfur battery, comprising a polynaphthalene / sulfur composite material and porous titanium dioxide; the porous titanium dioxide is coated on the surface of the polynaphthalene / sulfur composite material. The present invention also provides a preparation method of the composite material for the positive electrode of the lithium-sulfur battery, as well as a positive electrode and a battery made of the composite material for the positive electrode of the lithium-sulfur battery. In the composite material for the positive electrode of the lithium-sulfur battery provided by the present invention, the porous titanium dioxide is wrapped on the surface of the polynaphthalene / sulfur composite material, so that the lithium polysulfide generated at the positive electrode of the battery is not easily soluble in the electrolyte when the battery is discharged. Secondly, the composite material for positive electrode of lithium-sulfur battery provided by the present invention greatly increases the S loading capacity of the electrode material, so that the sulfur content in the polynaphthalene / sulfur composite material is as high as 65% to 80%. In addition, because both polynaphthalene and titanium dioxide have certain elasticity, the combination of the two has a double slowing effect on the volume expansion of the electrode.

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 Patents(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
Owner JIANGXI NORMAL UNIV
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