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Preparation method for complex, positive electrode and battery both containing same

A composite and positive electrode technology, applied in the field of electrochemical energy storage, can solve the problems of limited lithium-sulfur batteries, deterioration of battery cycle performance, and unsatisfactory electrochemical performance, and achieve the goal of improving cycle performance, minimizing losses, and minimizing losses. Effect

Inactive Publication Date: 2014-08-06
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, elemental sulfur will be converted into polysulfides, and polysulfides will be dissolved in the liquid organic electrolyte, and the loss of these active substances will lead to the deterioration of the battery cycle performance, resulting in the lithium-sulfur battery being used in practical applications. limited in application
In order to make better use of lithium-sulfur batteries, some ways to solve the defects of sulfur cathodes have been explored, such as the synthesis of carbon-sulfur composites and the surface coating of conductive polymers, etc. The chemical properties are still not ideal, so new methods need to be found to prepare composite materials with better performance

Method used

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  • Preparation method for complex, positive electrode and battery both containing same
  • Preparation method for complex, positive electrode and battery both containing same
  • Preparation method for complex, positive electrode and battery both containing same

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preparation example Construction

[0024] The invention provides a preparation method of the complex, comprising: mixing pyrrole monomer and nanometer elemental sulfur suspension for the first time; adding FeCl 3 The solution was mixed for the second time; the precipitate was obtained by filtration; the precipitate was washed; dried to obtain a polypyrrole / sulfur (PPy / S) complex.

[0025] The present invention provides a method for preparing the complex. Preferably, the mass ratio of the pyrrole monomer to the nanometer elemental sulfur suspension is 1:16-1:24, and the pyrrole monomer to the FeCl 3 FeCl in solution 3 The mass ratio is 1:5-1:7. More preferably, the mass ratio of the pyrrole monomer to the nanometer elemental sulfur suspension is 1:20, and the pyrrole monomer to the FeCl 3 FeCl in solution 3 The mass ratio is 1:6.2. Among them, adding FeCl 3 The solution is used as an oxidizing agent to make the pyrrole monomer and the nano-elemental sulfur suspension better undergo in-situ redox polymerizat...

Embodiment 1

[0048] Preparation of PPy / S composite: 0.2g of pyrrole monomer was added to 4g of nanometer elemental sulfur suspension (US research nanomaterials Inc, 10wt%), stirred for 0.5 hours, and 15mL of 0.5M FeCl was quantitatively added at room temperature 3 The solution was added dropwise with ultrasonic stirring, after continuous ultrasonication for 2 hours, the precipitate was obtained by filtration, the precipitate was thoroughly washed with deionized water and methanol, and the precipitate was vacuum-dried at 70°C for 12 hours to obtain PPy / S Complex.

[0049] Material Performance Testing

[0050] The crystal morphology of the complex was determined by an X-ray diffractometer equipped with Cu Kα rays; the internal structure of the PPy / S complex was observed by a high-resolution transmission electron microscope (HRTEM, FEI TITAN80-300) equipped with an energy dispersive spectrometer (EDS) ; The content of elemental sulfur in the PPy / S composite was tested by chemical analysis (C...

Embodiment 2

[0055] Preparation of PPy / S composite: 0.2g of pyrrole monomer was added to 4.5g of nanometer elemental sulfur suspension (US research nanomaterials Inc, 8wt%), stirred for 1 hour, and 15mL of 0.5M FeCl was quantitatively added at room temperature 3 The solution was added dropwise and ultrasonically stirred. After continuous ultrasonication for 2 hours, the precipitate was obtained by filtration. The precipitate was thoroughly washed with deionized water and methanol, and the precipitate was vacuum-dried at 70°C for 10 hours to obtain PPy / S Complex.

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Abstract

A provided preparation method for a complex comprises: performing first mixing on a pyrrole monomer and a nanometer simple-substance sulfur suspension, then adding a FeCl3 solution for second mixing; filtering to obtain a precipitate; washing the precipitate; and drying to obtain the polypyrrole / sulfur complex. The invention also provides a positive electrode and a battery both containing the complex. When the polypyrrole / sulfur complex prepared by employing the provided complex preparation method is used as the battery positive electrode, the battery has relatively good cycle performance.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a preparation method of a composite, a positive electrode with the composite, and a battery containing the positive electrode. Background technique [0002] In recent years, with the development of science and technology, the demand for energy, especially renewable green energy, has become more and more prominent. As an energy storage and conversion device, batteries are playing an irreplaceable role. Lithium-ion batteries have attracted extensive attention due to their high mass-specific energy and volume-specific energy. Low cost, high energy density, long cycle life, and green secondary batteries are the focus of lithium-ion battery development at present. [0003] The current commercial positive electrode materials are mainly layered or spinel-structured lithium transition metal oxides (such as lithium cobaltate, lithium manganate) and olivine-struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/13H01M10/0525
CPCY02E60/122H01M4/13H01M4/366H01M4/624H01M10/052Y02E60/10
Inventor 陈璞张永光
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD