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Convenient and cheap universal cladding technology

A coating and cheap technology, applied in the field of materials, can solve the problems of restricting practical application and high price of dopamine, and achieve the effects of wide application, improved electrochemical performance, and improved wettability

Inactive Publication Date: 2015-10-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, dopamine is expensive, which obviously restricts its further practical application, especially the prospect of industrialization.

Method used

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  • Convenient and cheap universal cladding technology
  • Convenient and cheap universal cladding technology
  • Convenient and cheap universal cladding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, catechol and lysine are used as raw materials to coat polyethylene film.

[0024] Prepare 150ml of mixed solvent of water and ethanol (volume ratio water / ethanol=1 / 2), add catechol and lysine each 0.01mol, stir and make it dissolve. Immerse the polyethylene film in the prepared mixed solution, take it out after stirring for 5 days, rinse it with water, and then air dry it. Obviously, the surface of the polyethylene film is covered with a layer of earth-gray coating material. The result is as figure 1 shown. It shows that this kind of coating method has excellent coating performance on polymers. figure 2 It is the infrared spectrum of the coated polyethylene film, in which there are absorption peaks of C-H unsaturated bonds near 2900cm-1, and the sharp absorption peaks at 1500 and 650-900 can be attributed to the C=C stretching vibration and benzene ring in the benzene ring. The out-of-plane bending vibration of C-H on the ring indicates that the...

Embodiment 2

[0026] The polyethylene film coated in Example 1 was used as a battery separator and assembled into a battery to improve battery performance.

[0027] The lithium sheet is used as the negative electrode, and the graphite used in the factory is used as the positive electrode. The coated polyethylene film and the uncoated polyethylene film are respectively used as battery separators to assemble a button battery, and the battery charge and discharge specific capacity performance test is carried out. By comparison, after the diaphragm is coated, the charge-discharge specific capacity of the battery increases from about 220mAh / g to about 340mAh / g, and the charge-discharge specific capacity of the battery increases by as much as half. The results are as follows image 3 shown. It shows that the coating of the separator by the polymer of catechol and lysine can be used to improve the battery separator and increase the charge-discharge specific capacity of the battery.

Embodiment 3

[0029] The polyethylene film coated in Example 1 was used as a battery separator and assembled into a battery, and the internal resistance of the battery was reduced by increasing the wettability of the separator.

[0030] Lithium iron phosphate is used as the positive electrode, silicon wafer is used as the negative electrode, polyethylene film and uncoated polyethylene film are used as battery separators respectively, and the battery is assembled for impedance performance testing. The results show that the battery impedance drops from about 430 ohms to about 220 ohms, such as Figure 4 shown. That is, the coating of the polymer of catechol and lysine can improve the wettability of the battery separator, thereby reducing the internal resistance of the battery.

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Abstract

The invention relates to a convenient and cheap universal cladding technology and particularly relates to a convenient and cheap cladding technology using phenols and derivatives thereof as well as common amino acid. According to the cladding technology, a polymer which is formed by phenols and derivatives thereof as well as common amino acid in a solution plays a good role in good adhesion effect, through simple immersing and stirring, uniform cladding layers are formed on the surfaces of the different substrates such as alloy, inorganic materials and organic polymers.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a simple and cheap universal coating technology. Background technique [0002] The coating modification of the material surface has always been of great use in the fields of modern chemistry, biology, material science, and applied science, energy and environment. Some current surface coating modification methods include monolayer self-assembly, functionalized silicon method, Langmuir-Blodgett deposition technology, stacking method, and surface-linked peptide method in genetic engineering. Although it has specific application examples in some studies, [0003] However, it is subject to many limitations in a wide range of practical applications. For example, special requirements on the chemical properties of the modified layer and substrate surface (such as functionalized silicon method), the use of complex equipment and the limitation of the size and shape of the coated modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/449
CPCH01M50/403H01M50/411Y02E60/10
Inventor 冯金奎张震
Owner SHANDONG UNIV
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