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Poly[1,4-bis(diphenylamino)benzene], application thereof and lithium ion battery prepared therefrom

A technology of lithium-ion batteries and triphenylamine, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low discharge specific capacity, achieve high charge-discharge specific capacity, significant charge-discharge voltage platform, and superior cycle stability Effect

Active Publication Date: 2015-11-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measured discharge specific capacity of the organic free radical battery prepared by the above-mentioned triphenylamine polymer is not high, and it is not as good as LiCoO2, the cathode material for commercial lithium-ion secondary batteries. 2 Capacity 140mAh·g -1

Method used

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  • Poly[1,4-bis(diphenylamino)benzene], application thereof and lithium ion battery prepared therefrom
  • Poly[1,4-bis(diphenylamino)benzene], application thereof and lithium ion battery prepared therefrom
  • Poly[1,4-bis(diphenylamino)benzene], application thereof and lithium ion battery prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: polydiphenylamine

[0036] Synthesis of triphenylamine: add 3.5g (20mmol) diphenylamine, 2.36g (10mmol) 1,4-dibromobenzene, 1.5g sodium tert-butoxide, 0.1g palladium acetate to a pre-dried 250mL three-necked flask , then add 40mL of toluene solution, stir evenly, inject 3mL tri-tertbutylphosphine into the reaction system with a syringe under the protection of nitrogen, and reflux at 110°C for 12 hours. After the reaction, the extraction reaction solution was repeatedly washed with dichloromethane and saturated brine for several times to obtain an extract, and then the crude product was extracted by thin-layer chromatography. 300-mesh silica gel was used as the stationary phase, and n-hexane / ethyl acetate was used as the mobile phase for gradient elution. Finally, 3.65 g of the target product was obtained as white needle-like crystals. The yield was 88.48%.

[0037] Synthesis of polydiphenyltriphenylamine: in a pre-dried 250mL three-necked flask, add didi...

Embodiment 2

[0041]The polyditerphenylamine obtained in Example 1 is used as the active material of the positive electrode material, and the lithium-ion battery is prepared according to the following steps:

[0042] a) Weigh 1 part of binder powder (polyvinylidene fluoride: PVDF) and disperse it in 10 parts of N-methylpyrrolidone solvent, seal and stir, and slightly heat to obtain a bonding slurry.

[0043] b) Weigh 4 parts of acetylene black and 5 parts of prepared polymer powder and mix them evenly.

[0044] c) Pour the mixture in b) into the bonding slurry in a), then add appropriate N-methylpyrrolidone, stir and mix evenly to obtain a mixed slurry with moderate viscosity.

[0045] d) The slurry in c) is evenly coated on the aluminum foil, and then vacuum-dried in an oven at 60° C. for 24 hours to obtain a positive electrode sheet.

[0046] e) With the positive electrode sheet prepared in d) as the positive electrode and the metal lithium sheet as the negative electrode, 1mol / LLiPF 6 ...

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Abstract

The invention provides a poly[1,4-bis(diphenylamino)benzene], an application thereof and a lithium ion battery prepared therefrom. The structure of the poly[1,4-bis(diphenylamino)benzene] is represented as the formula (I). The poly[1,4-bis(diphenylamino)benzene] is prepared through a step of with ferric trichloride as an oxidizing agent, performing a redox reaction to 1,4-bis(diphenylamino)benzene to prepare the poly[1,4-bis(diphenylamino)benzene] represented as the formula (I). The invention also provides the application of the poly[1,4-bis(diphenylamino)benzene]as an anode material of the lithium ion battery. In the invention, by means of reasonable molecular structure design, the density of free radicals in unit chain of the polymer is increased, so that the discharge capacity is multiplied through fully utilization of a multiple-order charge-discharge principle. In addition, conjugate electric-conductive frameworks of the triphenylamine are maintained, so that the poly[1,4-bis(diphenylamino)benzene], as the anode material, is improved in electronic transmission performance, so that the object of reducing the proportion of non-active electric-conductive carbon in the preparation process of the anode material is achieved. The lithium ion battery is excellent in cyclic stability, has a significant charge-and-discharge voltage platform and is high in charge-and-discharge specific capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to polydiphenyltriphenylamine, its application as a positive electrode material of lithium-ion batteries, and a lithium-ion battery prepared therefrom. Background technique [0002] With the further development of human society, the energy problems, resource problems and environmental problems facing the world are becoming more and more serious. Since the current energy structure is basically built on the basis of petrochemical fuels (petroleum, coal, natural gas), this not only causes the depletion of resources but also pollutes the environment. Electric energy will play an increasingly important role in the future due to its cleanliness, safety and convenience. Therefore, in the future, lithium-ion batteries with good mobility and convenient power storage and power supply will play a pivotal role in a society based on electric energy. [0003] In the cu...

Claims

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Application Information

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IPC IPC(8): C08G61/12H01M4/60
CPCY02E60/10
Inventor 苏畅杨芳张诚徐立环纪律律
Owner ZHEJIANG UNIV OF TECH
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