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A kind of preparation method of electrode composite material

A composite material and electrode technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems affecting the volume energy density and power energy density of lithium-sulfur batteries, the low-temperature performance and dynamic characteristics are not ideal, and the capacity density of sulfur-based cathode materials is affected and other problems, to achieve the effect of improving cycle performance and conductivity, improving conductivity and cycle performance, and high utilization rate

Inactive Publication Date: 2020-03-13
青岛亨迈新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this type of material also has some shortcomings of its own, such as: the content of sulfur in the material is not high enough, which affects the capacity density of sulfur-based cathode materials. At the same time, the stacking density of cathode materials is also low, and the electronic conductivity is poor. The characteristics are not ideal, which will inevitably affect the volume energy density and power energy density of lithium-sulfur batteries

Method used

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  • A kind of preparation method of electrode composite material
  • A kind of preparation method of electrode composite material
  • A kind of preparation method of electrode composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Dissolve 10g of polyacrylonitrile fibers in 100mL of dimethylformamide solution, heat and stir at 80°C for 2 hours, and stop heating after stirring;

[0026] (2) Add 2g of sucrose to the above solution, stir for 30min, and make it fully mixed;

[0027] (3) Add 40g of sulfur powder into the solution (in order to mix the sulfur powder evenly in the solution, add 40g of sulfur powder to the solution in 8 times and stir for 10min each time) when the sulfur powder is completely put in, stir for 1.5h again to make the sulfur The powder and the solution are thoroughly mixed;

[0028] (4) Put the mixture into a drying oven at 80° C. for drying for 15 hours to obtain a carbon-coated vulcanized polyacrylonitrile precursor;

[0029] (5) The carbon-coated vulcanized polyacrylonitrile precursor was ball-milled for 3 hours at a rate of 350r / min to obtain its powder;

[0030] (6) Put the above-mentioned carbon-coated vulcanized polyacrylonitrile precursor powder into a tube furn...

Embodiment 2

[0035] The steps are the same as in Example 1, except that the tube furnace in step (6) is heated to 450°C.

[0036] (1) Dissolve 10g of polyacrylonitrile in 100mL of dimethylformamide solution, heat and stir at 80°C for 2 hours, and stop heating after stirring;

[0037] (2) Add 2g of sucrose to the above solution, stir for 30min, and make it fully mixed;

[0038] (3) Add 40g of sulfur powder into the solution (in order to mix the sulfur powder evenly in the solution, add 40g of sulfur powder to the solution in 8 times and stir for 10min each time) when the sulfur powder is completely put in, stir for 1.5h again to make the sulfur The powder and the solution are thoroughly mixed;

[0039] (4) Put the mixture into a drying oven at 80° C. for drying for 15 hours to obtain a carbon-coated vulcanized polyacrylonitrile precursor;

[0040] (5) The carbon-coated vulcanized polyacrylonitrile precursor material was ball milled at a rate of 350r / min for 3h to obtain its powder;

[00...

Embodiment 3

[0045] The steps are the same as those in Example 1, except that the tube furnace in step (6) is heated to 350°C.

[0046] (1) Dissolve 10g of polyacrylonitrile in 100mL of dimethylformamide solution, heat and stir at 80°C for 2 hours, and stop heating after stirring;

[0047] (2) Add 2g of sucrose to the above solution, stir for 30min, and make it fully mixed;

[0048] (3) Add 40g of sulfur powder into the solution (in order to mix the sulfur powder evenly in the solution, add 40g of sulfur powder to the solution in 8 times and stir for 10min each time) when the sulfur powder is completely put in, stir for 1.5h to form a uniform phase solution;

[0049] (4) Put the mixture into a drying oven at 80° C. for drying for 15 hours to obtain a carbon-coated vulcanized polyacrylonitrile precursor;

[0050] (5) The carbon-coated vulcanized polyacrylonitrile precursor material was ball milled at a rate of 350r / min for 3h to obtain its powder;

[0051] (6) Put the above-mentioned car...

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Abstract

The invention relates to a preparation method of an electrode composite material. The method comprises the following steps of (1) dissolving polyacrylonitrile fiber in dimethylformamide to obtain a mixed solution; (2) adding sucrose into the solution; (3) adding sulfur powder into the mixed liquid; (4) placing the mixture in a drying box for drying for 12-24 hours to obtain a carbon-coated sulfurized polyacrylonitrile material precursor; (5) ball-milling the obtained carbon-coated sulfurized polyacrylonitrile to obtain carbon-coated sulfurized polyacrylonitrile precursor powder; and (6) placing the powder in a tubular furnace for heating to finally obtain the carbon-coated sulfurized polyacrylonitrile black powder. The carbon-coated sulfurized polyacrylonitrile material obtained according to the preparation method is low in construction cost, high in utilization ratio of elemental sulfur and relatively high in initial specific capacity; and moreover, due to the presence of a surface carbon layer, the conductivity and the cycle property of the material are improved.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium ion batteries, in particular to a method for preparing carbon-coated vulcanized polyacrylonitrile positive electrode materials. Background technique [0002] The theoretical capacity of lithium-sulfur battery is 1675mAh / g, the mass specific energy is 2600Wh / kg, the actual specific energy is 730Wh / kg or 900Wh / L at room temperature, 950Wh / kg or 1200Wh / L at 60°C, and elemental sulfur is in nature It has abundant reserves, low price, and is environmentally friendly. However, elemental sulfur is an insulator of electrons at room temperature, and lithium-sulfur batteries composed of elemental sulfur positive electrodes cannot be charged and discharged at room temperature. Through the research, it is found that the lithium-sulfur battery with S / PAN as the positive electrode material has become a research hotspot in the current high-energy power battery due to its hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62
CPCH01M4/362H01M4/604H01M4/625Y02E60/10
Inventor 张永光王新
Owner 青岛亨迈新能源有限公司
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