Flexible conductive carbon/metal composite nanofiber membrane, preparation method and application thereof, and lithium-sulfur battery

A nanofiber membrane and metal composite technology, applied in lithium batteries, non-aqueous electrolyte batteries, nanotechnology, etc., can solve the problems of capacity fading, difficult to reach, slow, etc.

Active Publication Date: 2020-04-28
INNER MONGOLIA UNIV FOR THE NATITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, severe shuttling of polysulfides, slow reaction kinetics, and poor electron/Li+ transport during discharge/charge cycling at high current densities lead to low effective sulfur utilization , leading to a sharp decline in capacity and a short cycle life, it is difficult to achieve the theoretical capacity (1675mAh·g-1) and energy density (2600Wh·kg-1) requirements
[0003] Confinement of polysulfides while accelerating the redox conversion kinetics of polysulfides by designing materials with high electrical conductivity and catalytic activity as sulfur supports was recently developed strategy, which anchors polysulfides through strong chemical adsorption, inhibits the shuttling of polysulfides, and reduces the activation energy of the reaction through electrocatalysis to accelerate the redox reaction kinetics; with the rapid development of sulfu...

Method used

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  • Flexible conductive carbon/metal composite nanofiber membrane, preparation method and application thereof, and lithium-sulfur battery
  • Flexible conductive carbon/metal composite nanofiber membrane, preparation method and application thereof, and lithium-sulfur battery
  • Flexible conductive carbon/metal composite nanofiber membrane, preparation method and application thereof, and lithium-sulfur battery

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preparation example Construction

[0040] The present invention also provides a preparation method for the flexible conductive carbon / metal composite nanofiber membrane described in the above technical solution, comprising the following steps:

[0041] Mix high molecular polymers, metal organic precursors and solvents to obtain spinning solutions, the high molecular polymers are polyacrylonitrile or polyvinylpyrrolidone, and the metal organic precursors include n-butyl titanate, n-zirconate Butyl ester or niobium alcohol;

[0042] Electrospinning the spinning solution to obtain fibers;

[0043] The fibers are carbonized to obtain the flexible conductive carbon / metal composite nanofiber membrane.

[0044] In the present invention, a high molecular polymer, a metal organic precursor and a solvent are mixed to obtain a spinning solution, the high molecular polymer is polyacrylonitrile or polyvinylpyrrolidone, and the metal organic precursor includes n-butyl titanate, zirconium n-Butyl Acetate or Niobium Alcohol....

Embodiment 1

[0059] Weigh 4mL of n-butyl titanate, 10mL of N,N-dimethylformamide, and 800mg of polyacrylonitrile, and stir in a 50mL beaker for 12 hours at the same time, until the solution is completely dissolved. Under the condition of -3KV, spin for 4 hours, then carbonize the spun fiber for 1 hour under the condition of high temperature 1000°C and high-purity nitrogen, and finally obtain the carbonized product containing titanium (Ti) nanoparticles. Flexible conductive carbon / metal Composite nanofiber membrane, the fiber membrane has a titanium metal content of 74 atomic percent, an oxygen atomic percent of 14 percent, a nitrogen atomic percent of 4 percent, and the balance being carbon, with a specific surface area of ​​149.8 m 2 / g, the average pore diameter is 3.18nm. The nanofibrous membrane was then cut into circles of equal size (12 mm in diameter) to serve as membrane reactors for lithium-sulfur batteries.

[0060] Choose 1M LiTFSI and 1% LiNO dissolved in DOL and DME (volume r...

Embodiment 2

[0071] Weigh 4mL of n-butyl titanate, 10mL of N,N-dimethylformamide, and 800mg of polyacrylonitrile, and stir in a 50mL beaker for 12 hours at the same time, until the solution is completely dissolved. Under the condition of -3KV, spin for 4 hours, then carbonize the spun fiber for 2 hours under the condition of high temperature 1000°C and high-purity nitrogen, and finally obtain the carbonized product containing titanium (Ti) nanoparticles. Flexible conductive carbon / metal Composite nanofiber membrane, the fiber membrane has a titanium metal content of 74 atomic percent, an oxygen atomic percent of 14 percent, a nitrogen atomic percent of 4 percent, and the balance being carbon, with a specific surface area of ​​149.8 m 2 / g, the average pore diameter is 3.18nm. The nanofibrous membrane was then cut into circles of equal size (12 mm in diameter) to serve as membrane reactors for lithium-sulfur batteries.

[0072] Choose 1M LiTFSI and 1% LiNO dissolved in DOL and DME (volume ...

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Abstract

The invention provides a flexible conductive carbon/metal composite nanofiber membrane, a preparation method and application thereof, and a lithium-sulfur battery, and belongs to the field of lithium-sulfur batteries. According to the invention, a conductive nanofiber membrane reactor is reasonably designed, chemical adsorption, electro-catalysis and ion (Li+) diffusion of a lithium-sulfur batterymembrane reactor are combined, polysulfide is limited on a nanoscale surface, and reversible conversion kinetics of the polysulfide is accelerated, so that the high sulfur utilization rate is realized, and in a rapid rechargeable, high-energy and high-power future lithium-sulfur battery technology, the flexible conductive carbon/metal composite nanofiber membrane has good rate capability and capacity retention capability under high discharge/charge current density, so that the lithium-sulfur battery is promoted to be developed towards the directions of high capacity and long cycle service life.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a flexible conductive carbon / metal composite nanofiber membrane, a preparation method and application thereof, and a lithium-sulfur battery. Background technique [0002] Conversion chemistry is the main electronic and energy storage process of lithium / sulfur (Li / S) batteries, involving the conversion of solid-state sulfur (S 8 ) to soluble lithium polysulfide (LiPS, Li 2 S x ,x:4~8) to solid Li 2 Multistep chemical transformations and phase transitions of S. S 8 to Li 2 S 8 The transformation of Li is a spontaneous process from a thermodynamic point of view, and polysulfides are essential to maintain the high capacity of lithium-sulfur batteries, from long-chain Li 2 S 8 to the short chain Li 2 Two-electron / lithium-ion redox conversion reaction during stepwise sulfur (S-S) bond scission of S (2Li + +2e - +xS→Li 2 S x (1≤x≤8)). Li 2 S x The bindin...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052B82Y30/00
CPCH01M4/625H01M4/626H01M4/628H01M10/052B82Y30/00Y02E60/10
Inventor 刘景海吉磊贾永峰段莉梅
Owner INNER MONGOLIA UNIV FOR THE NATITIES
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