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Process for preparing lithium sulfur battery modified anode

A lithium-sulfur battery and modified technology, applied in the field of electrochemical batteries, can solve the problems of poor cycle stability of lithium-sulfur batteries, and achieve the effects of weakening the shuttle effect, enhancing conductivity, improving performance and cycle life

Inactive Publication Date: 2014-12-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for modifying the positive electrode of a lithium-sulfur battery based on the above-mentioned prior art, utilizing the excellent electrical conductivity of the hollow nickel fiber tube and its good adsorption to sulfur fixation and polysulfides, To reduce the irreversible loss of active materials and improve their utilization rate, thereby improving the cycle performance of lithium-sulfur battery cathode materials and solving the problem of poor cycle stability of lithium-sulfur batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix according to the mass ratio of sublimated sulfur: amorphous carboacetylene black = 6:3, add absolute ethanol, ball mill for 6 hours, dry in a vacuum oven at 60°C for 12 hours, and set aside. The mixture obtained above and the hollow nickel fiber tube are dispersed in the mixed solution of LA32 water-based adhesive and absolute ethanol at a mass ratio of 5:1, stirred, and the slurry is prepared and coated on the metal surface cleaned by acetone ultrasonic cleaning. Dry on aluminum foil at 60° C. for 12 hours in a vacuum oven to obtain the positive electrode material for lithium-sulfur batteries.

[0020] The preparation method of described hollow nickel fiber pipe is:

[0021] a) Pretreatment of the fiber cloth substrate: place the fiber cloth substrate in acetone for 5 minutes for ultrasonic treatment, and then use H 2 o 2 and H 2 SO 4 The mixed solution of the fiber cloth substrate is roughened for 2min, and then cleaned with deionized water to obtain a pretrea...

Embodiment 2

[0028] Mix according to the mass ratio of sublimated sulfur: amorphous carbon activated carbon = 6:3, add absolute ethanol, ball mill for 6 hours, dry in a vacuum oven at 70°C for 12 hours, and set aside. Disperse the mixture obtained above and the nickel fiber tube in a mixed solution of PEO (polyethylene oxide) and DMF (dimethylformamide) in a mass ratio of 6:1, stir to prepare a slurry and coat it on After ultrasonic cleaning with acetone, the metal aluminum foil was dried in a vacuum oven for 12 hours to obtain the positive electrode material for lithium-sulfur batteries.

[0029] The preparation method of described hollow nickel fiber pipe is:

[0030] a) Pretreatment of the fiber cloth substrate: place the fiber cloth substrate in acetone for 5 minutes for ultrasonic treatment, and then use H 2 o 2 and H 2 SO 4 The mixed solution of the fiber cloth substrate is roughened for 2min, and then cleaned with deionized water to obtain a pretreated fiber cloth substrate;

...

Embodiment 3

[0037] Mix according to the mass ratio of sublimated sulfur: crystalline carbon graphite carbon = 6:3, add absolute ethanol, ball mill for 6 hours, dry in a vacuum oven at 80°C for 12 hours, and set aside. Disperse the mixture obtained above and the nickel fiber tube in the β-cyclodextrin aqueous solution at a mass ratio of 9:1, stir to prepare the slurry and coat it on the metal aluminum foil that has been ultrasonically cleaned with acetone, and put it in a vacuum drying oven Dry in medium temperature for 12h to obtain the positive electrode material for lithium-sulfur battery.

[0038] The preparation method of hollow nickel fiber tube is:

[0039] a) Pretreatment of the fiber cloth substrate: place the fiber cloth substrate in acetone for 5 minutes for ultrasonic treatment, and then use H 2 o 2 and H 2 SO 4 The mixed solution of the fiber cloth substrate is roughened for 2min, and then cleaned with deionized water to obtain a pretreated fiber cloth substrate;

[0040]...

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Abstract

The invention relates to a preparation for a lithium sulfur battery modified anode material. The preparation includes mixing sublimed sulfur and a conductive agent according to a mass ratio of 6:3, adding absolute ethyl alcohol, performing ball milling for 6 hours, drying in a vacuum drying box for 12 hours at the temperature of 50 DEG C to 80 DEG C to obtain a mixture, mixing the mixture and hollow nickel fiber tubes according to a mass ratio of (5-9):1, adding an adhesive, dispersing in a dispersing agent, stirring to obtain slurry, coating the slurry on a metal aluminum foil which is subjected to acetone ultrasonic cleaning, and drying in the vacuum drying box for 12 hours at the temperature of 60 DEG C to obtain the lithium sulfur battery anode material. The preparation for the lithium sulfur battery modified anode material has the advantages that electrochemistry performances of battery cyclicity and the like are improved, and the performances and cyclic service life of the battery can be improved.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, in particular to the preparation of a lithium battery modified cathode material. Background technique [0002] As a positive electrode 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 the theoretical specific energy is 2600Wh / kg, which is the currently known cathode material (LiCoO 2 , LiNiO 2 , LiMn 2 o 4 The theoretical specific capacity is 275mAh / g, 274mAh / g, 148mAh / g), which is the highest among the specific capacities, far greater than the lithium secondary batteries that have been commercialized at the present stage, and is a positive electrode material with broad application prospects. [0003] However, the poor electrochemical activity and cycle stability of sulfur limit its commercial practical application. Sulfur is an electronic and ion insulator (co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/62
CPCY02E60/122Y02E60/10
Inventor 王传新谢秋实汪建华王升高谢海鸥晏倩王子行
Owner WUHAN INSTITUTE OF TECHNOLOGY
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