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Isolating layer used for lithium-sulfur battery

A lithium-sulfur battery and interlayer technology, which is applied to battery components, circuits, electrical components, etc., to achieve the effects of reducing battery internal resistance, improving cycle and rate performance, and improving ion conductivity

Inactive Publication Date: 2017-07-07
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of existing lithium-sulfur batteries, to provide a kind of interlayer for lithium-sulfur batteries and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 0.4g of sulfonic acid lithiated multi-walled carbon nanotubes, 0.05g of acetylene black, 0.05g of LA132 binder, 2g of isopropanol and water in a volume ratio of 1:3 to prepare a mixed solution, stir at room temperature for 24 hours Finally, it was evenly coated on the polypropylene separator with a film applicator, dried naturally to form a protective interlayer, and then assembled into a lithium-sulfur battery according to the way that the interlayer was attached to the positive electrode for electrochemical performance testing. The battery structure is as follows: figure 1 shown. At 0.1C (1C=1675mA h g -1 ), the first discharge specific capacity of the battery assembled with the separator modified by sulfonate lithiation modified coating reached 1259mA h g -1 , the 100-cycle cycle capacity is stable at 1048mAhg -1 , the single-turn attenuation rate is about 0.15%, which is much lower than that of lithium-sulfur batteries (0.35%) with ordinary diaphragms, and its...

Embodiment 2

[0016] Add 0.4g of sulfonic acid lithiated graphene, 0.02g of Ketjen carbon, 0.08g of polytetrafluoroethylene, 2g of n-propanol and water in a volume ratio of 1:3 to prepare a mixed solution, stir at room temperature After 24 hours, it was evenly coated on the positive electrode sheet by spraying method, and formed a protective interlayer after drying, and then assembled into a lithium-sulfur battery according to the normal assembly method for electrochemical performance testing.

Embodiment 3

[0018] Add 0.3g of sulfonic acid lithiated activated carbon, 0.1g of alumina, 0.05g of Super P, 0.05g of gelatin, 2g of n-propanol and water in a volume ratio of 1:3 to prepare a mixed solution, stir at room temperature for 24 hours, In the glove box, it is evenly coated on the negative electrode lithium sheet by spraying method, after drying, a protective interlayer is formed, and then assembled into a lithium-sulfur battery according to the normal assembly method for electrochemical performance testing.

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Abstract

The invention relates to an isolating layer used for a lithium-sulfur battery. The surfaces of a positive electrode, a negative electrode or a diaphragm are coated with the isolating layer, or the isolating layer can be attached to the space between the positive electrode and diaphragm or between the negative electrode and diaphragm in an independent sheet-shaped solid way so as to protect the battery; and the functional isolating layer comprises three components, including a functional agent, a binder and a conductive agent, wherein the functional agent is a lithium sulfonate group-containing carbon material, a polymer, or a mixture of the carbon material and the polymer, and a material formed by the carbon material and the polymer and corresponding metal oxides thereof based on different proportions in a mixing manner. By virtue of lithium sulfonate included in the components of the isolating layer, lithium ion concentration in an electrolyte and ion mass transfer rate are improved; by virtue of the existence of sulfonate, the ionic conductivity can be reinforced, and by matching with the use of the binder, an obvious chemical blocking and adsorption effect on lithium polysulfide is achieved, so that dissolving and diffusion are effectively suppressed, and surface passivation, formed by deposition of insoluble lithium polysulfide, on the lithium negative electrode surface can be relieved; and meanwhile, by virtue of the addition of the conductive agent, the internal resistance of the battery is lowered.

Description

technical field [0001] The invention relates to an interlayer used for a lithium-sulfur battery, belonging to the field of chemical power sources. Background technique [0002] With the continuous development of science and technology, portable devices and power sources have higher and higher performance requirements for batteries. It is imminent to develop a small, lightweight and high energy density battery. Lithium-sulfur battery has high specific capacity (1675mAh / g) and high specific energy (2600Wh / kg) due to its active material elemental sulfur, and has the advantages of rich elemental sulfur resources, low cost, environmental friendliness, safety and reliability, and has extensive research and development. App background. However, the active materials of lithium-sulfur batteries have poor conductivity, and the intermediate polysulfides in the charging and discharging process are easy to dissolve and diffuse in the electrolyte, and have side reactions with positive el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/411H01M50/431H01M50/489H01M50/491
CPCH01M50/409Y02E60/10
Inventor 程兴王安邦王维坤苑克国金朝庆杨裕生
Owner NO 63971 TROOPS PLA
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