Lithium-sulfur secondary battery system

A lithium-sulfur secondary battery and system technology, applied in secondary batteries, battery electrodes, electrode carriers/current collectors, etc., can solve the problems of poor cycle performance of lithium-sulfur batteries, reduce the solubility of polysulfide ions, etc., and improve Coulombic efficiency , Improve the interface performance, the effect of good adsorption

Active Publication Date: 2013-08-14
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems in current lithium-sulfur batteries, and propose to replace the existing electrolyte system with an electrolyte system with a high-concentration lithium salt as the electrolyte, thereby greatly reducing the solubility of polysulfide ions in the electrolyte, thereby achieving effective suppression The shuttle effect improves the coulombic efficiency of charge and discharge, which is expected to completely solve the problem of poor cycle performance of lithium-sulfur batteries

Method used

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Examples

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Embodiment 1

[0020] The lithium-sulfur battery system simulates the battery, and the specific manufacturing process is as follows:

[0021] Positive electrode material and its pole piece production process:

[0022] The carbon-sulfur composite material uses 2# porous carbon. The specific parameters are as follows: specific surface area (m2 / g): 1431, average pore diameter (nm): 3.8, pore volume (cc / g): 1.58

[0023] The preparation process of the cathode material is as follows:

[0024] Mix porous carbon 2# with elemental sulfur powder at a ratio of 4:6 by weight, seal the above carbon-sulfur composite material into an airtight argon-filled glass tube, and heat-treat the raw material at 155 degrees for 24 hours.

[0025] Weigh a certain amount of carbon-sulfur composite material, carbon nanotubes and polyvinylidene fluoride (PVDF) according to the weight percentage of 8:1:1, and stir and mix them evenly with pyrrolidone as a dispersant. The aluminum foil coated with a layer of carbon is u...

Embodiment 2

[0031] The lithium-sulfur battery system simulates the battery, and the specific manufacturing process is as follows:

[0032] Positive electrode material and its pole piece production process:

[0033] The carbon-sulfur composite material uses 1# porous carbon. The specific parameters are as follows: specific surface area (m2 / g): 671, average pore diameter (nm): 2.5, pore volume (cc / g): 0.77

[0034] The carbon-sulfur composite material uses 2# porous carbon. The specific parameters are as follows: specific surface area (m2 / g): 1431, average pore diameter (nm): 3.8, pore volume (cc / g): 1.58

[0035] The preparation process of the cathode material is as follows:

[0036] Mix porous carbon 1# with elemental sulfur powder at a weight percentage of 5:5, and porous carbon 2# and elemental sulfur powder at a weight percentage of 4:6, 3:7, and 2:8, respectively, and compound the above four kinds of carbon and sulfur The material was enclosed and sealed in an argon-filled glass tub...

Embodiment 3

[0044] The lithium-sulfur battery system simulates the battery, and the specific process is as follows:

[0045] Positive electrode material and its pole piece production process:

[0046] The preparation process of the carbon-sulfur composite material is as follows: the porous carbon 1# is mixed with sulfur powder at a weight percentage of 5:5, sealed and airtight in an argon-filled glass tube, and the raw material is treated at 155 degrees for 24 hours.

[0047] Weigh a certain amount of carbon-sulfur composite material, sodium alginate and acetylene black according to the weight percentage of 7:2:1, and use deionized water as a dispersant to stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry is evenly coated on the current collector, then dried and cut into pole pieces with the same shape and area. The negative pole piece is made of lithium metal.

[0048] Electrolyte system:

[0049] The electrolytic solution adopts an organic electro...

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Abstract

The invention discloses a lithium-sulfur secondary battery system. The system comprises a positive electrode, a negative electrode and electrolyte, wherein an active substance of the positive electrode is a carbon-sulfur composite material, the negative electrode adopts a metal lithium plate, the electrolyte is high-salinity non-aqueous electrolyte, and the high-salinity non-aqueous electrolyte comprises lithium salt, sodium salt or lithium-sodium mixed salt and non-aqueous organic solvent; and the mol ratio of the lithium salt or the lithium-sodium mixed salt and the non-aqueous organic solvent is 2 to 10 mol/L. The lithium-sulfur secondary battery system has the following remarkable advantages that since the electrolyte system can effectively prevent multi-sulfur ions of the lithium-sulfur battery from being dissolved in the electrolyte in the charging and discharging processes, the multi-sulfur ions which are dissolved in the electrolyte can be prevented from producing a shuttle effect at the last stage of the charging, the over-charge phenomenon can be prevented, and the coulombic efficiency can be improved to be more than 99 percent. Therefore, the cycling performance of the battery also can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a lithium-sulfur secondary battery system. Background technique [0002] The current commercial use of lithium-ion battery cathode materials is mainly concentrated on transition metal lithium intercalation oxides, including cobalt, iron, nickel, manganese oxides and their doping compounds, but such compounds are limited by their own theoretical capacity. At present, the theoretical energy density of the commercialized system is around 600Wh / Kg. Although the industrial level continues to improve, the current power battery using this as the cathode material can achieve a maximum of 200Wh / Kg, and it is expected to reach 300Wh / Kg in the future, but the room for improvement has been limited. very limited. The development of future electric vehicles urgently requires a cathode material with higher energy density. [0003] Lithium-sulfur batteries due to their high specific capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M4/62H01M4/66
CPCY02E60/12Y02E60/10
Inventor 胡勇胜索鎏敏李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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