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A method and an application of a fluorocarbon additive for lithium sulfide battery

A lithium-sulfur battery and carbon fluoride technology, applied in secondary batteries, battery electrodes, battery recycling, etc., can solve problems such as volume expansion, low Coulombic efficiency, and fast specific capacity decay

Inactive Publication Date: 2019-01-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems are as follows: 1) the active material sulfur and the final discharge product lithium sulfide are non-conductive, which leads to low sulfur utilization and rapid specific capacity decay; 2) the reaction of sulfur to lithium sulfide leads to severe volume expansion, About 80%; 3) The reaction intermediate product long-chain lithium polysulfide is easily soluble in the electrolyte, resulting in a "shuttle effect"; 4) Many problems of the lithium anode itself need to be solved urgently, such as the growth of lithium dendrites
These issues lead to low coulombic efficiency, rapid capacity loss, and low active material sulfur utilization

Method used

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  • A method and an application of a fluorocarbon additive for lithium sulfide battery
  • A method and an application of a fluorocarbon additive for lithium sulfide battery
  • A method and an application of a fluorocarbon additive for lithium sulfide battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 5mg of carbon fluoride, 70mg of sulfur, 20mg of conductive agent Super P, and 10mg of polyvinylidene fluoride, mix them evenly in the solvent N-methylpyrrolidone, and evenly coat them on the carbon-coated aluminum foil, and then put the prepared electrode sheet Dry in an ordinary drying oven at 60°C for 12h, and then transfer to a vacuum oven at 60°C for 12h. With metal lithium sheet as negative electrode, 1.0M LiTFSI, 5% LiNO 3 DME: DOL = 1: 1Vol% is the electrolyte, the separator uses a commercial Celgar 2400 separator, the battery case model is 2025, and the button cell is assembled in a glove box (oxygen content is less than 0.5ppm, water content is less than 0.5ppm).

[0026] After the battery assembly is completed, the rate charge and discharge cycle test is performed on the battery tester (Wuhan Landian Battery Test System), the working voltage is 1.8-3V, and the data is collected and drawn and analyzed by origin data processing software.

[0027] When the...

Embodiment 2

[0029] Weigh 10mg of carbon fluoride, 70mg of sulfur, 20mg of conductive agent Super P, and 10mg of polyvinylidene fluoride in the solvent N-methylpyrrolidone and mix them evenly, and evenly coat them on the carbon-coated aluminum foil, and then put the prepared electrode sheet Dry in an ordinary drying oven at 60°C for 12h, and then transfer to a vacuum oven at 60°C for 12h. With metal lithium sheet as negative electrode, 1.0M LiTFSI, 5% LiNO 3 DME: DOL = 1: 1Vol% is the electrolyte, the separator uses a commercial Celgar 2400 separator, the battery case model is 2025, and the button cell is assembled in a glove box (oxygen content is less than 0.5ppm, water content is less than 0.5ppm).

[0030] After the battery assembly is completed, the rate charge and discharge cycle test is performed on the battery tester (Wuhan Landian Battery Test System), the working voltage is 1.8-3V, and the data is collected and drawn and analyzed by origin data processing software.

[0031] When...

Embodiment 3

[0033] Weigh 20mg of fluorinated carbon, 70mg of sulfur, 20mg of conductive agent Super P, and 10mg of polyvinylidene fluoride in the solvent N-methylpyrrolidone and mix them evenly, and evenly coat them on the carbon-coated aluminum foil, and then put the prepared electrode sheet Dry in an ordinary drying oven at 60°C for 12h, and then transfer to a vacuum oven at 60°C for 12h. With metal lithium sheet as negative electrode, 1.0M LiTFSI, 5% LiNO 3 DME: DOL = 1: 1Vol% is the electrolyte, the separator uses a commercial Celgar 2400 separator, the battery case model is 2025, and the button cell is assembled in a glove box (oxygen content is less than 0.5ppm, water content is less than 0.5ppm).

[0034] After the battery assembly is completed, the rate charge and discharge cycle test is performed on the battery tester (Wuhan Landian Battery Test System), the working voltage is 1.8-3V, and the data is collected and drawn and analyzed by origin data processing software.

[0035] W...

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Abstract

The invention relates to an additive which can be used as a lithium sulfur battery cathode material and performance comparison under different proportions, belonging to the field of energy storage. Fluorocarbon, active material sulfur, conductive carbon and binder PVDF were mechanically milled to make lithium sulfide battery. Fluorine doped carbon produced by fluorocarbon discharge was used to improve the cycle life and rate performance of lithium sulfide battery. As an additive for lithium sulfide batteries, fluorocarbons can not only provide additional conductive carbon at the cathode, but also adsorb lithium polysulfide on the fluorocarbons. The lithium sulfide battery prepared with the additive has the advantages of high capacity, long cycle life, stable charge / discharge efficiency, easy availability and low cost of raw materials, simplicity of production process and innocuity of reaction process, which are conducive to the application of the method in industrial production.

Description

technical field [0001] The invention relates to a class of additives that can be used as positive electrode materials for lithium-sulfur batteries and performance comparisons under different ratios, belonging to the field of energy storage. Background technique [0002] In the past few decades, lithium-ion batteries have been widely used in 3C products (computer, communication and consumer electronics) due to their high safety. However, the energy density of commercial lithium-ion batteries is low at present, only Unable to meet the growing demand of emerging large-scale energy storage technologies, such as electric vehicles and grid energy storage. Among many advanced rechargeable battery systems, lithium-sulfur (Li-S) batteries have been widely concerned and studied because of their high theoretical specific capacity. High theoretical specific energy (2500W h -1 ) and sulfur is very abundant on earth, cheap, non-toxic, and environmentally friendly. [0003] Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M6/52H01M10/0525
CPCH01M4/364H01M4/38H01M4/5815H01M4/625H01M4/628H01M6/52H01M10/0525Y02W30/84Y02E60/10
Inventor 霍峰蔚高聪李盛邵梦吴健生郑冰张伟娜
Owner NANJING UNIV OF TECH
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