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Preparation method of high-capacity fluoride/porous carbon composite positive electrode material

A technology of porous carbon material and positive electrode material, which is applied in the field of preparation of high-capacity composite positive electrode material, can solve the problems of limited improvement of electrochemical performance, poor long-term cycle stability, easy particle agglomeration, etc. Excellent performance and high selectivity

Inactive Publication Date: 2018-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technical solutions, the main problem is that it is difficult for the fluoride particles to be uniformly dispersed and closely combined with the high-conductivity carbon during the compounding process, so that the fluoride in the compound is easily released from the high-conductivity carbon matrix after repeated charging and discharging. Poor long cycle stability
However, at present, nano-fluorides still have the problem of complex preparation process, and because the ultrafine particles are prone to agglomeration, the effect of improving electrochemical performance is very limited.

Method used

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  • Preparation method of high-capacity fluoride/porous carbon composite positive electrode material
  • Preparation method of high-capacity fluoride/porous carbon composite positive electrode material
  • Preparation method of high-capacity fluoride/porous carbon composite positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Include the following steps:

[0060] (1) 3g of anhydrous ferric fluoride (its particle size is 20 microns) and 1g of porous carbon fiber (the specific surface area of ​​porous carbon fiber is 700m 2 / g, the average pore diameter is 5nm) placed in absolute ethanol, it was fully mixed through ultrasonic treatment for 8 hours, then filtered and dried to obtain the ferric fluoride / porous carbon composite precursor ( figure 1 , 2 );

[0061] (2) Disperse the precursor evenly and evenly at the bottom of the small beaker for one "spray-vacuum-dry" treatment, in which the amount of each spray is 2mL, and the volume ratio of water / ethanol in water is 1:1. Place in a sealed suction filter bottle with a vacuum of -0.1MPa for 5 minutes, the drying temperature during the treatment is 120°C, and the drying time is 2 hours;

[0062] (3) Place the product obtained after the "spray-vacuum-dry" treatment at 120°C for 60 hours for final dehydration treatment, and finally obtain nano-f...

Embodiment 2

[0065] The preparation method is the same as in Example 1, except that the quality of anhydrous ferric fluoride and porous carbon in the step (1) of Example 1 is changed to 2g and 2g respectively, and the phase characterization shows that the resulting product is a nano-ferric fluoride / porous carbon fiber composite material , the size of ferric fluoride is about 5nm, which is distributed on the surface and in the pores of the porous carbon fiber. .

[0066] The prepared materials were prepared according to the method in Example 1 to make a positive electrode sheet of a lithium-ion battery, and a simulated battery was assembled. Under the current density of 200mA / g, the prepared battery completed the charge and discharge test with a charge and discharge interval of 2-4.5V. The first reversible specific capacity of the battery is 210mAh / g, and the reversible specific capacity after 200 cycles is 143mAh / g.

Embodiment 3

[0068] The preparation method is the same as in Example 1, except that the quality of anhydrous ferric fluoride and porous carbon fiber in the step (1) of Example 1 is changed to 4g and 1g respectively, and the phase characterization shows that the resulting product is a nano-ferric fluoride / porous carbon fiber composite material , the size of ferric fluoride is about 5nm, which is distributed on the surface and in the pores of the porous carbon fiber.

[0069] The prepared materials were prepared according to the method in Example 1 to make a positive electrode sheet of a lithium-ion battery, and a simulated battery was assembled. Under the current density of 200mA / g, the prepared battery completes the charge and discharge test in the charge and discharge range of 2-4.5V (theoretical specific capacity at this voltage is 237mAh / g). The initial reversible specific capacity of the battery is 266mAh / g, and the reversible specific capacity after 200 cycles is 207mAh / g (relative to t...

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Abstract

The invention discloses a high-capacity fluoride / porous carbon composite positive electrode material and a preparation method thereof. A nano iron fluoride / porous carbon composite material is obtainedby taking iron fluoride and porous carbon as raw materials through steps of firstly mixing to prepare an iron fluoride / porous carbon compound; then carrying out no less than one time of solvent spraying-vacuumizing-drying treatment on the iron fluoride / porous carbon compound. By controlling the pore diameter of the porous carbon, a compounding ratio and the number of times of treating, the embedding mount of iron fluoride can be flexibly adjusted, so that the nano iron fluoride / porous carbon composite material prepared by the preparation method has the characteristics of simplicity and high efficiency; special experiment equipment and devices are not needed and amplified production is easy to generate; the high-capacity fluoride / porous carbon composite positive electrode material has a wide application prospect in the field of lithium-ion batteries. Meanwhile, after the fluoride / porous carbon composite positive electrode material designed and prepared by the preparation method is subjected to 200 circles of charging-discharging circles under the current density of 200mA / g, the reversible specific capacity is greater than or equal to 116mAh / g.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic nanometer materials, and in particular relates to a preparation method of a high-capacity composite cathode material. Background technique [0002] Due to the advantages of high energy density, long cycle life, good power performance and environmental friendliness, lithium-ion batteries have been widely used in portable electronic devices, and have good application prospects in the fields of electric vehicles and large-scale energy storage. However, the energy density of commercial lithium-ion batteries is close to the theoretical limit, but still far from the requirements of transportation and energy storage devices. Among them, the positive electrode materials used in the mainstream of lithium-ion batteries, such as lithium cobaltate and lithium iron phosphate, have relatively low theoretical specific capacities. half. With the development and application of more high-capacity anode mat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 杨娟周向阳孙洪旭丁静徐章林
Owner CENT SOUTH UNIV
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