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Preparation method of iron oxide/carbon fiber composite lithium ion battery negative electrode material

A technology of iron oxides and composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the electrochemical performance needs to be improved, the electrode manufacturing process is complicated, and the battery negative electrode material cannot be used directly as an electrode, etc., and achieves excellent results. The effect of electrochemical performance, controllable morphology, and simplified preparation process

Active Publication Date: 2020-04-21
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is calcined MOFs or carbon fibers, the obtained battery anode materials cannot be used directly as electrodes, but need to be coated on metal current collectors with the help of conductive agents and binders. Not only the electrode manufacturing process is complicated, but also the battery Chemical properties also need to be improved

Method used

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  • Preparation method of iron oxide/carbon fiber composite lithium ion battery negative electrode material
  • Preparation method of iron oxide/carbon fiber composite lithium ion battery negative electrode material
  • Preparation method of iron oxide/carbon fiber composite lithium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Preparation of MIL-88A / PAN composite fiber

[0034] Dissolve 0.480 g of MIL-88A in 3 mL of dimethylformamide (DMF) (that is, the content of MIL-88A is 60 wt%), and disperse it ultrasonically for 20 min to obtain a suspension. Weigh 0.32g PAN and dissolve it in the above suspension, then put the mixed solution in a water bath at 65°C and stir for 18 hours, take it out, leave it at room temperature for 4 hours, and then electrospin the solution. The process conditions of electrospinning are set as follows: the voltage is 15kV, receiving distance 16cm, solution flow rate 200μL / min, drying in a drying oven at 80°C to prepare MIL-88A / PAN fibers.

[0035] (2) Preparation of iron oxide / carbon fiber

[0036] The MIL-88A / PAN fibers were placed in a tube furnace, and pre-oxidized at 250 °C for 2 h under air conditions, and then nitrogen (N 2 >99.99%), heat treatment at 400°C for 3 hours, and then naturally cool down to room temperature to obtain iron oxide / carbon fiber comp...

Embodiment 2

[0041] Dissolve 0.0355 g of MIL-88A in 3 mL of dimethylformamide (that is, the content of MIL-88A is 10 wt %), and ultrasonically disperse for 20 min to obtain a suspension. Weigh 0.32g PAN and dissolve it in the above suspension, then put the mixed solution in a water bath at 65°C and stir for 18 hours, take it out, leave it at room temperature for 4 hours, and then electrospin the solution. The process conditions of electrospinning are set as follows: the voltage is 10kV, receiving distance 12cm, solution flow rate 200μL / min, drying in an oven at 80°C to prepare MIL-88A / PAN fibers.

[0042] The MIL-88A / PAN fibers were placed in a tube furnace, and pre-oxidized at 250 °C for 2 h under air conditions, and then nitrogen (N 2 >99.99%), heat treatment at 400°C for 3h, then naturally cool down to room temperature to obtain iron oxide / carbon fiber (Fe 2 o 3 / CF) composite material. From Figure 4 It can be seen that there are rod-shaped iron oxides distributed on the surface of...

Embodiment 3

[0045] Dissolve 0.080 g of MIL-88A in 3 mL of dimethylformamide (that is, the content of MIL-88A is 20 wt %), and disperse it ultrasonically for 20 min to obtain a suspension. Weigh 0.32g PAN and dissolve it in the above suspension, then put the mixed solution in a water bath at 65°C and stir for 18 hours, take it out, leave it at room temperature for 4 hours, and then electrospin the solution. The process conditions of electrospinning are set as follows: the voltage is 13kV, the receiving distance is 10cm, the solution flow rate is 200μL / min, and dried in a drying oven at 80°C to prepare MIL-88A / PAN fibers.

[0046] The MIL-88A / PAN fibers were placed in a tube furnace, and pre-oxidized at 250 °C for 2 h under air conditions, and then nitrogen (N 2 >99.99%), heat treatment at 400°C for 3h, then naturally cool down to room temperature to obtain iron oxide / carbon fiber (Fe 2 o 3 / CF) composite material. From Figure 6 It can be seen that there are rod-shaped iron oxides dist...

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Abstract

The invention discloses a preparation method for an iron oxide / carbon fiber composite lithium ion battery negative electrode material. The preparation method comprises the following steps: taking an iron based metal organic framework as a precursor, mixing the precursor with a PAN solution, and performing electrostatic spinning to obtain a metal organic framework / PAN fiber; and thermally treatingthe metal organic framework / PAN fiber under inert atmosphere to prepare an iron oxide / carbon fiber composite material. The iron oxide / carbon fiber composite material prepared by the preparation methodhas good toughness, conductivity, an ordered pore channel structure and a great specific surface area, is taken as a lithium ion battery negative electrode material, and has relatively high first-time discharge specific capacity, relatively high charge specific capacity, highly high first-time coulomb efficiency, relatively high circulating stability and relatively high rate performance.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials, and in particular relates to a preparation method of an iron oxide / carbon fiber composite lithium ion battery negative electrode (material). Background technique [0002] Anode materials are the main components of lithium-ion batteries, which directly affect the performance of lithium-ion batteries. At present, the anode material of commercial lithium-ion batteries is mainly graphite, but its theoretical specific capacity is only 372mA h / g, which is difficult to meet the needs of large-capacity and high-power chemical power sources in the power field such as new energy electric vehicles. Therefore, the development of anode materials with high specific capacity, high safety, and low cost has become one of the hotspots in theoretical and applied research. [0003] Metal-organic framework (MOFs) materials are composed of metal ions and organic ligands, and have the characteristics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/587H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/366H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 杜慧玲曹娜王金磊马万里郗雪艳
Owner XIAN UNIV OF SCI & TECH
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