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Lithium sulfur battery provided with adsorption layer

A lithium-sulfur battery and adsorption layer technology, which is applied to battery electrodes, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as cycle performance degradation and battery capacity attenuation

Inactive Publication Date: 2011-09-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the problem that polysulfides, the intermediate products of lithium-sulfur batteries, are easy to dissolve in the electrolyte and diffuse to the negative electrode with the electrolyte, resulting in battery capacity attenuation and cycle performance degradation, etc., the present invention adds an adsorption layer to the structure of the lithium-sulfur battery

Method used

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  • Lithium sulfur battery provided with adsorption layer
  • Lithium sulfur battery provided with adsorption layer
  • Lithium sulfur battery provided with adsorption layer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Select carbon nanotube and sulfur composite material as positive electrode active material, acetylene black as conductive agent, 5wt% polyvinylidene fluoride solution (solution solvent is N-methylpyrrolidone) as binding agent to prepare positive electrode slurry, wherein positive electrode active material , The mass ratio of the conductive agent and the binder is 80%: 15%: 5%. Then, the slurry is coated on the nickel foam to form a sheet, and dried to form a positive electrode sheet with a thickness of 45-55um.

[0024] The selected specific surface area is 1000m 2 Activated carbon per g is used as the adsorption material of the adsorption layer, and the adsorption material activated carbon is prepared as an adsorption layer on the surface of the porous diaphragm, and the porous diaphragm is prepared into a CR2025 button battery with a Celgard2400 film, wherein the electrolyte is 1mol / L LiPF6 / EC:DMC : EMC (1:1:1 volume ratio, EC: ethylene carbonate, DMC: dimethyl carbo...

Embodiment 2

[0027] Select carbon nanotube and sulfur composite material as positive electrode active material, acetylene black as conductive agent, 5wt% polyvinylidene fluoride solution (solution solvent is N-methylpyrrolidone) as binding agent to prepare positive electrode slurry, wherein positive electrode active material The mass ratio of the conductive agent and the binding agent is 80%: 15%: 5%, and the porous carbon microspheres are used as the adsorption material of the adsorption layer to prepare the positive electrode sheet. The same method as in Example 1 was used to prepare the positive electrode sheet and assemble the battery.

[0028] The battery charge and discharge test results show that the first charge and discharge specific capacity of the material is 780.3mAh / g, and the specific capacity remains at 587.2mAh / g after 50 cycles, showing good battery performance.

Embodiment 3

[0030]Select carbide-derived carbon and sulfur composite material (wherein the pore size distribution of carbide-derived carbon is 0.5 ~ 5nm) as the positive electrode active material, acetylene black as the conductive agent, and the binder is the same as in Example 1 to prepare the positive electrode sheet, the positive electrode The mass ratio of active material, conductive agent and binder in the sheet is 80%:12%:8%. Mesoporous carbon was used as the material of the adsorption layer to prepare the adsorption layer, and the same method as in Example 1 was used to prepare the positive electrode sheet and assemble the battery.

[0031] The charge-discharge test results show that the first charge-discharge specific capacity of the material is 753.7mAh / g, and the specific capacity remains at 548.1mAh / g after 50 cycles, showing good battery performance.

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Abstract

The invention relates to a lithium sulfur battery provided with an adsorption layer. The adsorption layer is added in the lithium sulfur battery, is made of a strong-adsorption material with a high specific surface area and a porous structure, and is positioned between an anode pole piece and a porous diaphragm. The adsorption layer can adsorb polysulfide formed in charging and discharging processes of the lithium sulfur battery and prevent the polysulfide dissolved in electrolytic solution from scattering to the surface of a cathode to generate corrosion reaction with lithium and cause irreversible capacity losses of the battery. Therefore, the adsorption layer can improve the performance of the lithium sulfur battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery with an adsorption layer technical background [0002] Cathode materials have always been the bottleneck restricting the development of lithium batteries. The current commercial lithium battery active materials are mainly LiCoO 2 , LiMnO 4 Wait. Compared with the negative electrode, the specific energy of commercial cathode materials is too low, LiCoO 2 The specific capacity is 130~140mAh / g, LiMnO 4 The specific capacity of lithium batteries is 110-130mAh / g, and they are expensive. Therefore, it is particularly critical and urgent to develop new green energy storage cathode materials with high energy density, low cost and long cycle life. [0003] As a cathode material, elemental sulfur has the advantages of high specific capacity, low price, and low toxicity. The theoretical specific capacity of elemental sulfur is 1675mAh / g, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/136H01M2/16
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 木士春陈伟
Owner WUHAN UNIV OF TECH
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