Production method of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrode used for lithium-sulfur battery

A lithium-sulfur battery and carbon fiber technology, which is applied in the preparation of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrodes, and in the field of preparation of lithium-sulfur battery negative electrodes, can solve the problem that the electrode flexibility does not meet the requirements of winding, fiber and liquid lithium Poor compatibility, cumbersome deposition substrate preparation process and other issues, to achieve high specific capacity, high porosity, and the effect of inhibiting lithium dendrites

Inactive Publication Date: 2017-05-24
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In recent years, some research groups have tried to melt lithium metal into a liquid and combine it with three-dimensional porous fibers to prepare a lithium-containing negative electrode. This negative electrode can effectively inhibit the generation of lithium dendrites and reduce the polarization potential of the battery. Bending within the bending process, but the electrochemical performance loss rate can reach up to 50% during the bending process
In addition, the composite negative electrode adopts a lithium metal melting process, which not only requires harsh conditions such as an inert atmosphere, but also has poor compatibility with liquid lithium, making it difficult to prepare a uniform composite negative electrode. However, the flexibility of the electrode is far from meeting the requirements of industrial winding
A research team used chemical methods to deposit porous micron-scale fiber copper on the surface of copper foil. This deposition substrate improved the cycle stability of the lithium metal negative electrode. In the half-cell composed of lithium sheets, the Coulombic efficiency can reach 97%, but due to Due to the high-density nature of copper, the micron copper fibers of the deposition substrate will greatly increase the quality of the deposition substrate. At the same time, the preparation process of the deposition substrate is cumbersome and expensive

Method used

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  • Production method of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrode used for lithium-sulfur battery
  • Production method of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrode used for lithium-sulfur battery
  • Production method of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrode used for lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0039] Clamp the cotton with a thickness of 9mm with a flat and smooth graphite plate, apply a certain pressure to keep the cotton compact, put it into a tube furnace under the protection of a nitrogen atmosphere and calcinate it at 1000°C for 6 hours, take it out, and cut it into pieces with scissors . The shredded carbonized cotton was mixed with the binder polyvinylidene fluoride (PVDF) at a ratio of 9:1, stirred for 10 h until uniform, then coated on a copper foil with a scraper, and dried in vacuum at 80°C. After drying, the coated negative electrode was punched into small discs with a diameter of 18mm, which were placed on the button battery electrode shell, and the counter electrode was a lithium sheet, and the electrolyte was 1M LiTFSI / DME:DOL (1:1v / v), the separator is Cegard 2340, assembled into a half cell.

[0040] This half cell is at 1mA / cm 2 Charge and discharge at a constant current density, first allow the prepared negative electrode to intercalate lithium,...

Embodiment 2

[0043] Take a certain amount of commercial carbon felt and cut it into pieces with scissors. The shredded carbon felt and the binder polyvinylidene fluoride (PVDF) were mixed in a mass ratio of 9:1, stirred for 10 h until uniform, then coated on the copper foil with a scraper, and vacuum-dried at 80°C. After drying, the coated negative electrode was punched into small discs with a diameter of 18mm, which were placed on the button battery electrode shell, and the counter electrode was a lithium sheet, and the electrolyte was 1M LiTFSI / DME:DOL (1:1v / v), the separator is Cegard 2340, assembled into a half cell.

[0044] This half cell is at 1mA / cm 2 Charge and discharge at a constant current density, first allow the prepared negative electrode to intercalate lithium, and after the battery voltage reaches 0V, conduct constant current lithium ion deposition for a certain period of time. After 50 cycles, no obvious lithium dendrites appeared in the negative electrode, and the Cou...

Embodiment 3

[0046] Take a certain amount of commercial polyimide carbonized carbon fiber and cut it into pieces with scissors. The shredded carbon fiber is mixed with hard carbon and binder polyvinylidene fluoride (PVDF) in a mass ratio of 6:3:1, stirred for 10 hours until uniform, and then coated on the copper foil with a scraper, vacuumed at 80°C dry. After drying, the coated negative electrode was punched into small discs with a diameter of 18mm, which were placed on the button battery electrode shell, and the counter electrode was a lithium sheet, and the electrolyte was 1M LiTFSI / DME:DOL (1:1v / v), the separator is Cegard 2340, assembled into a half cell.

[0047] This half cell is at 1mA / cm 2 Charge and discharge at a constant current density, first allow the prepared negative electrode to intercalate lithium, and after the battery voltage reaches 0V, conduct constant current lithium ion deposition for a certain period of time. After 50 cycles, no obvious lithium dendrites appear...

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Abstract

The invention discloses a production method of a lithium / carbon fiber or porous carbon paper / copper foil composite negative electrode used for a lithium-sulfur battery. The method comprises the following steps: producing a carbon fiber / copper foil negative electrode from carbon fibers, conductive carbon and a binder through a coating technology, and embedding and depositing lithium through an electrochemical technology to produce the lithium / carbon fiber / copper foil composite negative electrode; or superposing copper foil and porous carbon paper to produce a porous carbon paper / copper foil negative electrode, and embedding and depositing lithium through the electrochemical technology to produce the lithium / porous carbon paper / copper foil composite negative electrode. The lithium / carbon fiber or porous carbon paper / copper foil composite negative electrode is flexible, can be easily reeled, can be used in the lithium-sulfur battery, and has the advantages of dendrite growth inhibition, high coulombic efficiency, high specific capacity and good electrochemical characteristics.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery negative electrode, in particular to a preparation method of a lithium / carbon fiber or porous carbon paper / copper foil composite negative electrode that inhibits lithium dendrite growth, high Coulombic efficiency, and high specific capacity, and can be used as a negative electrode in The lithium-sulfur battery belongs to the technical field of lithium metal batteries. Background technique [0002] The successful commercialization of lithium-ion batteries has enabled rapid development and considerable progress in portable electronics and electric delivery vehicles. However, with the development of science and technology, different industries have put forward higher requirements for battery performance. The traditional graphite anode (372mAh / g) has been difficult to meet the demand for anode materials for the new generation of high specific energy batteries. Li metal anode has hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/66H01M10/0567H01M4/04H01M4/1395H01M10/052
CPCH01M4/0404H01M4/0452H01M4/1395H01M4/382H01M4/663H01M4/667H01M10/052H01M10/0567H01M2004/021Y02E60/10
Inventor 陈康华帅毅林华陈送义何璇
Owner CENT SOUTH UNIV
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