Nylon engineering plastic high-valued electrode active material and preparation method thereof

A technology of electrode active materials and engineering plastics, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of expensive conjugated organic electrode materials, gaps in specific capacity and rate performance, and restrictions on wide application, and achieve benefits that can be achieved The effect of continuous development, increased added value, and good thermal stability

Inactive Publication Date: 2019-05-10
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
11 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the intrinsic electronic conductivity of conjugated organic electrode materials and the limited utilization of active groups lead to a large gap in their specific capacity and rate performance compared with traditional inorganic materials. More importantly, conjugated ...
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Method used

As shown in Figure 1, in lithium ion battery, adopt pure nylon 6 as electrode active material, test with the scan rate of 1mV/s in the voltage range of 0.01-2.5V, in the first lap discharge process The 0.4V position has the...
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Abstract

The invention provides a nylon engineering plastic high-valued electrode active material and a preparation method thereof. The nylon engineering plastic high-valued electrode active material is a nylon or nylon/carbon composite material, wherein the nylon/carbon composite material is formed by combining nylon and a carbon nanometer material. The invention creatively proposes to take nylon engineering plastic as the electrode active material, the material does not comprise a conjugated structure which is possessed by the electrode active material, while the material has favorable thermal stability, mechanical flexibility and electrochemical oxidization-reduction reaction activity, so that the electrode active material has potentials when used as a metal ion battery electrode active material; and meanwhile, the additional value of the nylon engineering plastic can be improved by taking the material as the electrode active material, the application of mineral resources such as a non-renewable transition metal oxide and graphite is reduced, and the material is very beneficial for sustainable development of energy utilization.

Application Domain

Cell electrodesSecondary cells

Technology Topic

IonOxide +13

Image

  • Nylon engineering plastic high-valued electrode active material and preparation method thereof
  • Nylon engineering plastic high-valued electrode active material and preparation method thereof
  • Nylon engineering plastic high-valued electrode active material and preparation method thereof

Examples

  • Experimental program(6)

Example Embodiment

[0027]
[0028] In the first embodiment, pure nylon 6 is used as the electrode active material, specifically:
[0029] Mix commercially available nylon 6, conductive agent (SP), and polyvinylidene fluoride (PVDF) in a mass ratio of 6:3:1 and grind evenly. Stir to a stable slurry. Coated into a 0.06mm thick pole piece, dried in a blast drying oven at 60°C for 3 to 6 hours, then moved into a vacuum drying oven and dried at 80°C for 12 hours, and taken out after cooling to obtain a working electrode. The prepared working electrode was cut into pole pieces with a diameter of 10 mm, and half-cell assembly was carried out in a glove box, wherein the electrolyte was 1 M LiPF 6 , the electrolyte is prepared by mixing ethylene carbonate (EC) and dimethyl carbonate (DMC) in a volume ratio of 1:1.
[0030] Performance characterization:
[0031] like figure 1 As shown, in the lithium-ion battery, pure nylon 6 was used as the electrode active material, and the test was carried out at a scan rate of 1mV/s in the voltage range of 0.01-2.5V, and there was an SEI film at the 0.4V position during the first cycle of discharge. The 0.01V and 0.8V positions correspond to the reduction peaks, and the 0.4V and 1.0V positions correspond to the oxidation peaks. The stable redox peaks prove the reversibility of the battery reaction.
[0032] like figure 2 As shown, at the current density of 20 mA/g, the specific capacity of the first charge is 196.6 mAh/g, when the current density is expanded by 25 times, the specific capacity is still 77 mAh/g, and the retention rate is 39%, showing good rate performance .
[0033] like image 3 As shown, at 200 mA/g, the first charge specific capacity was 131.2 mAh/g, and after 300 cycles, the specific capacity was still 113 mAh/g, and the retention rate was 86%, showing good cycle performance.

Example Embodiment

[0034]
[0035] In the second embodiment, nylon 66/graphene composite material is used as the electrode active material.
[0036] Preparation:
[0037]Take 4.8 g of commercially available nylon 66 powder and 0.2 g of graphene, add 20 mL of N-methylpyrrolidone, mix evenly, transfer it to a ball milling jar, and go through high-speed mechanical ball milling for 6 hours at a rotational speed of 200 rpm. Ethanol washing and vacuum drying to obtain nylon 66/graphene composite electrode active material.
[0038] Used in batteries:
[0039] The nylon 66/graphene composite electrode active material obtained in the above steps, the conductive agent (SP), and the polyvinylidene fluoride (PVDF) are mixed and ground evenly according to the mass ratio of 6:3:1, and an appropriate amount of N-methyl methyl is added dropwise according to the situation. - 2-Pyrrolidone (NMP), ground and stirred to a stable slurry. Coated into a 0.06mm thick pole piece, dried in a blast drying oven at 60°C for 3 to 6 hours, then moved into a vacuum drying oven and dried at 80°C for 12 hours, and taken out after cooling to obtain a working electrode. The obtained working electrode was cut into pole pieces with a diameter of 10 mm, and half-cell assembly was carried out in a glove box, wherein the electrolyte was 1M LiPF6, and the electrolyte was composed of ethylene carbonate (EC) and dimethyl carbonate (DMC) according to It is prepared by mixing in a volume ratio of 1:1.
[0040] Performance characterization:
[0041] like Figure 4 As shown, in the lithium-ion battery, the nylon 66/graphene composite electrode active material was used, and the first three cyclic voltammetry curves were tested in the voltage window of 0.01-2.5V and the scan rate was 1mV/s. During the discharge process, the SEI film was formed at the 0.3V position. The 0.01V and 0.8V positions correspond to the reduction peaks, and the 0.4V and 1.0V positions correspond to the oxidation peaks. The stable redox peaks prove the reversibility of the battery reaction. .
[0042] like Figure 5 As shown, at a current density of 20 mA/g, the first charge-discharge specific capacities were 150 and 325 mAh/g, respectively, the Coulombic efficiency was 46%, and the charge-discharge voltage plateau was consistent with the redox peaks in the cyclic voltammogram.
[0043] like Image 6 As shown, at the current density of 20mA/g, the specific capacity of the first charge is 150mAh/g, and when the current density is expanded by 25 times, the specific capacity still retains 111mAh/g, the retention rate is 74%, showing better rate performance .

Example Embodiment

[0044]
[0045] The method for providing nylon 610/carbon fiber composite electrode active material in the third embodiment is as follows:
[0046] Take 4.5 g of commercially available nylon 610 powder and 0.5 g of carbon fiber, add 50 mL of N,N-dimethylformamide, mix evenly, and undergo high-speed shearing for 2 hours at a rotational speed of 20,000 rpm. Suction filtration, ethanol washing, and vacuum drying to obtain nylon 610/graphene composite electrode active material.

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