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Preparation method of nano-composite membrane electrode material

A nanocomposite, membrane electrode technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of agglomeration, high lithium intercalation potential, poor electrical conductivity, etc., and achieve stable performance, uniform particle size, and improved electrical conductivity. Effect

Inactive Publication Date: 2015-08-26
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing electrode materials that are easy to agglomerate when nano-titanium dioxide is used, resulting in high lithium intercalation potential and poor electrical conductivity, the present invention provides a nanocomposite membrane electrode material, and further provides a preparation method for the electrode material

Method used

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  • Preparation method of nano-composite membrane electrode material
  • Preparation method of nano-composite membrane electrode material
  • Preparation method of nano-composite membrane electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) dissolving manganese sulfate, tetrabutyl titanate, and polyacrylonitrile in N,N-dimethylformamide (DMF) is prepared into a uniform spinning solution, so that the concentration of manganese sulfate is 0.3mol / L, The concentration of tetrabutyl titanate is 1.0 mol / L, and the mass concentration of polyacrylonitrile is 10 wt%.

[0028] (2) Carry out electrospinning to described spinning solution, obtain nanofiber material, namely electrospun nanofiber precursor film, wherein the condition of electrospinning is, needle inner diameter 1mm, spinning voltage 12kV, receiving mode is drum receiving , the spinning solution flow rate is 0.5ml / h, the receiving distance is 20cm, and the spinning time is 3h.

[0029] (3) Carrying out pre-oxidation treatment to the nanofibrous material, the process is firstly keeping the temperature at 120° C. for 1 hour, and then keeping the temperature at 250° C. for 2 hours. After pre-oxidation treatment, in a nitrogen atmosphere, control the he...

Embodiment 2

[0031] (1) Dissolve manganese acetate, titanic acid, and polyvinyl alcohol in DMSO to prepare a uniform spinning solution, so that the concentration of manganese acetate is 0.1mol / L, the concentration of titanic acid is 0.1mol / L, and the mass of polyvinyl alcohol The concentration is 7 wt%.

[0032] (2) Electrospinning is carried out to described spinning solution, obtains nanofiber material, namely electrospun nanofiber precursor film, and wherein the condition of electrospinning is, needle inner diameter 0.6mm, spinning voltage 20kV, receiving mode is drum For receiving, the flow rate of the spinning solution is 0.3ml / h, the receiving distance is 30cm, and the spinning time is 2h.

[0033] (3) Carrying out pre-oxidation treatment to the nanofibrous material, the process is firstly keeping the temperature at 100° C. for 2 hours, and then keeping the temperature at 250° C. for 4 hours. After the pre-oxidation treatment, in a nitrogen atmosphere, control the heating rate at 3°...

Embodiment 3

[0035] (1) Dissolve manganese oxalate, isopropyl titanate, and polyvinylpyrrolidone in chloroform to prepare a uniform spinning solution, so that the concentration of manganese oxalate is 0.5mol / L, and the concentration of isopropyl titanate is 0.5mol / L, the mass concentration of polyvinylpyrrolidone is 15wt%.

[0036] (2) Electrospinning is carried out to described spinning solution, obtains nanofiber material, namely electrospun nanofiber precursor film, and wherein the condition of electrospinning is, needle inner diameter 2.0mm, spinning voltage 8kV, receiving mode is drum For receiving, the flow rate of the spinning solution is 1.5ml / h, the receiving distance is 10cm, and the spinning time is 6h.

[0037] (3) Pre-oxidize the nanofibrous material, the process is to first keep warm at 100° C. for 2 hours, and then keep the temperature at 250° C. for 2 hours. After the pre-oxidation treatment, in a helium atmosphere, control the heating rate at 5°C / min. When it reaches 100...

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Abstract

The invention discloses a preparation method of a nano-composite membrane electrode material. The preparation method comprises the following steps: (1) dissolving a precursor of manganese, a precursor of titanium and a precursor of carbon in an organic solvent to prepare a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a nano-fiber material; and (3) after performing pre-oxidation treatment on the nano-fiber material, performing carbonization treatment in an inert atmosphere to obtain the required nano-composite membrane electrode material. The MnOx / TiO2 / C nano-fiber composite membrane electrode material prepared by the preparation method is excellent in performance, nano particles of MnO2 and TiO2 are distributed on carbon nanofibers with good electric conductivity and porous structure in a mutually interlaced manner, and crystal structures of MnO2 and TiO2 nano particles affect each other and the MnO2 and TiO2 nano particles coordinately distribute on the carbon nanofiber membrane , so that the intercalation and deintercalation efficiency of lithium is improved, and the cycle performance and rate performance of the electrode material are improved; and moreover, the porous structure of the carbon nano-fibers provides a passage for the intercalation and deintercalation of lithium ions, and the electric conductivity is improved.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a nanocomposite membrane electrode material, and belongs to the field of new energy storage materials. Background technique [0002] Lithium-ion batteries are currently the most widely used secondary batteries due to their high energy density, long service life and no memory effect. They are mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes and safety devices. Their working principles are summarized as , when charging, lithium ions are released from the lattice of the positive electrode, pass through the electrolyte and separator, get an electron, and then be reduced to lithium, which is embedded in the structure of the negative electrode material. On the contrary, lithium in graphite loses an electron and becomes Lithium ions migrate to the positive electrode and intercalate back into the positive electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/139
CPCB82Y30/00H01M4/139H01M4/362Y02E60/10
Inventor 杨秀娟
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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