Oleophylic sulfur electrode preparation method

A technology of sulfur electrode and porous electrode, which is applied in the field of lithium-sulfur battery positive electrode and its preparation, can solve the problems of reduced battery discharge capacity, reduced cycle stability, and aggravated lithium polysulfide dissolution and loss, and achieves improved capacity retention and low raw material costs. Low, the effect of improving Coulombic efficiency and cycle stability

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] At present, the method to improve the diffusion resistance of lithium ions in lithium-sulfur batteries is mainly to build pores with hundreds of nanometers in the positive electrode. However, the consequence of this measure is to intensify the dissolution and loss of lithium polysulfide during the discharge process, resulting in a decrease in the discharge capacity of the battery. Consequences of reduced cycle stability

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Embodiment 1

[0026] Add oil furnace carbon (XC-72) and polyvinylidene fluoride to N-methylpyrrolidone at a ratio of 9:1, and fully stir, wherein the solid content is 5%, to obtain slurry A; Evenly coated on Torry060 carbon paper, dried at 90°C to obtain pole piece B, the coating thickness on carbon paper is 10 μm; 50% sulfur-carbon nanotube composite, acetylene black and Polyvinylidene fluoride was added to N-methylpyrrolidone at a ratio of 7:2:1, and fully stirred. Among them, the solid content was 15%, and slurry C was obtained; the slurry C was evenly coated on the pole piece B, and after After drying at a temperature of 50°C, the positive pole piece D of a traditional lithium-sulfur battery is obtained, and the sulfur loading is 3.5mg / cm 2 . Ultrasonically mix methyl hydrogen-containing silicone oil (viscosity of silicone oil is 5Pa·S) and isopropanol at a volume ratio of 1:10 to obtain a silicone oil mixture. On the pole piece, after it is uniformly dispersed, vacuum filter for 20 m...

Embodiment 2

[0028] Add oil furnace carbon (XC-72) and polytetrafluoroethylene into N-methylpyrrolidone at a ratio of 99:1, and fully stir, wherein the solid content is 50%, to obtain slurry A; Uniformly coated on Torry090 carbon paper and dried at 50°C to obtain pole piece B, the coating thickness on carbon paper is 50 μm; 90% sulfur-carbon airgel composite, carbon nano Add tube and polytetrafluoroethylene into N-methylpyrrolidone at 8:1:1, and stir thoroughly, wherein the solid content is 5%, to obtain slurry C; evenly coat slurry C on pole piece B , after being dried at a temperature of 90°C, the positive pole piece D of the traditional lithium-sulfur battery is obtained, and the sulfur loading is 0.5mg / cm 2 . Ultrasonically mix methylphenyl silicone oil (viscosity of silicone oil is 100Pa·S) and carbon tetrachloride at a volume ratio of 1:0.5 to obtain a silicone oil mixture, put the pole piece D on the Buchner funnel, and add the silicone oil mixture dropwise Put it on the pole piec...

Embodiment 3

[0030]Add oil furnace carbon (XC-72) and polyvinylidene fluoride to N-methylpyrrolidone at a ratio of 9:1, and fully stir, wherein the solid content is 10%, to obtain slurry A; Uniformly coated on Torry060 carbon paper, after drying at a temperature of 90°C, the pole piece B was obtained, and the coating thickness on the carbon paper was 10 μm; 50% sulfur-activated carbon composite, acetylene black and poly Vinylidene fluoride was added to N-methylpyrrolidone at a ratio of 9:0:1, and fully stirred, wherein the solid content was 15%, to obtain slurry C; evenly coated slurry C on pole piece B, after temperature After being dried at 50°C, the positive electrode piece D of the traditional lithium-sulfur battery is obtained, and the sulfur loading is 4.5mg / cm 2 . Ultrasonically mix simethicone oil (viscosity of silicone oil is 15Pa·S) and isopropanol at a volume ratio of 1:10 to obtain a silicone oil mixture. On the chip, after it is uniformly dispersed, it is vacuum filtered for...

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Abstract

The invention relates to an oleophylic sulfur electrode preparation method, silicone oil is penetrated into a positive porous electrode, and dried to obtain a porous oleophilic sulfur electrode, and the mass content of the silicone oil in the porous oleophilic sulfur electrode is 0.2-30%; by use of the oleophilic property of the silicone oil, an electrolyte uniformly infiltrates into the electrode, and especially lithium ion conduction in a high load sulfur electrode can be effectively achieved, so that the electrochemical performance of high load elemental sulfur can be played, and silicon oxygen bonds contained in the silicone oil can be effectively combined with lithium polysulfide in the discharge process, and self discharge phenomenon caused by dissolving and shuttling of the polysulfide can be suppressed, so that the objective of improving the lithium sulfur battery coulombic efficiency and cycle stability can be achieved.

Description

technical field [0001] The invention relates to a positive electrode of a lithium-sulfur battery and a preparation method thereof, in particular to a highly lipophilic sulfur electrode. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. In order to meet the needs of society and greatly increase the energy density of batteries, the development of new materials and new systems is necessary. [0003] Lithium-sulfur battery is a secondary battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode. Its specific energy can theoretically reach 2600Wh / kg, and the actual energy density can reach 400Wh / kg at present, and it is very likely to increase to At the same time, the elemental sulfur cathode material has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/133H01M4/139H01M4/1393H01M4/628H01M2004/028Y02E60/10
Inventor 王美日张华民张洪章张益宁马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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