Electrolyte diaphragm for vanadium cell and preparation method thereof

A technology of electrolyte diaphragm and vanadium battery, which is applied in the field of vanadium batteries, can solve the problems of poor vanadium ion barrier performance, inability to completely prevent vanadium ion penetration, and high cost, and achieve good chemical stability and electrochemical stability, which is beneficial to Effects of battery capacity and enhancement of mechanical properties

Inactive Publication Date: 2012-05-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These separators have high ion conductivity, long life, good chemical and electrochemical stability, but high cost, and poor barrier performance to vanadium ions, which affects the cycle capacity of the battery
[0004] my country has not yet commercially produced ion separators suitable for vanadium batteries, and can only rely on imports
However, commercial separators still face a major problem, that is, the penetration of vanadium ions.
In actual use, the diaphragm cannot completely prevent the penetration of vanadium ions in the positive and negative electrolytic cells, so that the vanadium ions in the positive and negative electrolytic cells permeate each other, resulting in a decrease in battery capacity; at the same time, the migration of vanadium ions in the diaphragm will also drive water The migration of molecules will cause the imbalance of positive and negative electrolyte water, resulting in changes in the concentration of the electrolyte, which may cause unstable precipitation of the electrolyte and affect the battery life.

Method used

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  • Electrolyte diaphragm for vanadium cell and preparation method thereof
  • Electrolyte diaphragm for vanadium cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) 0.5 g of a porous polytetrafluoroethylene film with a thickness of 0.05 mm, a porosity of 50%, a pore diameter of 20 nm, and a number average molecular weight of 200,000 is immersed in 50 g of a solution with a volume ratio of methanol and water of 1:1, Stir and soak at 0°C for 10 hours to obtain a mixed solution I.

[0025] 2) Pour the mixed solution of methanol and ethyl orthosilicate in a molar ratio of 2:1 into the above mixed solution I at 0°C, continue to stir, take the film out of the solution after 10 minutes, and dry it naturally Vacuum dry at 50° C. under a pressure of 0.02 MPa for 10 hours. Then, put the obtained porous polytetrafluoroethylene membrane into a Nafion solution with a mass percent concentration of 1% and soak it for 5 minutes at 0°C, take it out and dry it in the air to obtain PTFE / SiO 2 / Nafion composite membrane is the electrolyte diaphragm for vanadium battery provided by the present invention.

[0026] figure 1 is VOSO 4 On untreated ...

Embodiment 2

[0028] 1) 0.5 g of a porous polytetrafluoroethylene film with a thickness of 0.5 mm, a porosity of 90%, a pore diameter of 500 nm, and a number average molecular weight of 200,000 is immersed in 500 g of a solution with a volume ratio of methanol and water of 10:1, Stir and soak at 50° C. for 24 hours to obtain a mixed solution I.

[0029]2) Pour the mixed solution of methanol and ethyl orthosilicate in a molar ratio of 10:1 into the above mixed solution I at 30°C, continue to stir, take the film out of the solution after 30 minutes, and dry it naturally Vacuum dry at 80° C. under a pressure of 0.08 MPa for 20 hours. Then, put the obtained porous polytetrafluoroethylene membrane into a Nafion solution with a mass percent concentration of 10%, soak it for 30 minutes at 40°C, take it out and dry it in the air to obtain PTFE / SiO 2 / Nafion composite membrane is the electrolyte diaphragm for vanadium battery provided by the present invention.

Embodiment 3

[0031] 1) 0.5 g of a porous polytetrafluoroethylene film with a thickness of 0.1 mm, a porosity of 70%, a pore diameter of 100 nm, and a number average molecular weight of 200,000 is immersed in 250 g of a solution with a volume ratio of methanol and water of 5: 1, Stir and soak at 25°C for 15 hours to obtain a mixed solution I.

[0032] 2) Pour the mixed solution of methanol and ethyl orthosilicate in a molar ratio of 3:1 into the above mixed solution I at 20°C, continue to stir, take the film out of the solution after 15 minutes, and dry it naturally Vacuum dry at 70° C. and 0.05 MPa pressure for 10 hours. Then, put the obtained porous polytetrafluoroethylene membrane into a Nafion solution with a mass percent concentration of 5%, soak it for 10 minutes at 20°C, take it out and dry it in the air to obtain PTFE / SiO 2 / Nafion composite membrane is the electrolyte separator for vanadium battery provided by the present invention.

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Abstract

The invention discloses an electrolyte diaphragm for a vanadium cell and a preparation method thereof. The method comprises the following steps of: (1) soaking a porous polyfluortetraethylene film in a mixed liquid consisting of methanol and water to obtain a mixed liquid I; and (2) uniformly mixing the mixed liquid consisting of methanol and ethyl orthosilicate with the mixed liquid I obtained in the step (1), reacting, taking an obtained porous polyfluortetraethylene film out after reacting, drying in vacuum, and soaking into a proton conductive polymer solution to obtain the electrolyte diaphragm for the vanadium cell. In the electrolyte diaphragm for the vanadium cell provided by the invention, the using amount of the proton conductive polymer with high price is reduced on the whole, and the cost of the electrolyte diaphragm is lowered; and nano-silicon dioxide is added, so that the pore diameter structure of an ion film can be effectively controlled, the permeation of vanadium ions is reduced, and the conservation of cell capacity is facilitated.

Description

technical field [0001] The invention belongs to the technical field of vanadium batteries, in particular to an electrolyte diaphragm for a vanadium battery and a preparation method thereof. Background technique [0002] The use of renewable energy for power generation is a sustainable development path. Due to the unstable characteristics of the power generation system, large-scale energy storage devices are required to improve the quality of electric energy. All-vanadium redox flow battery has the characteristics of high efficiency, low cost, long life, adjustable capacity and power, and convenient operation. It is a relatively mature large-scale energy storage technology. [0003] Among the various components of the all-vanadium redox flow battery, the electrolyte separator plays the role of separating the positive and negative electrolytes and conducting the ionic current inside the battery, and is one of the most critical materials. At present, in the field of vanadium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08L27/18H01M8/02H01M2/16H01M8/1069H01M8/1072
CPCY02E60/12Y02E60/50Y02P70/50
Inventor 余晴春林茂财孙洋洲管涛梁嘉
Owner CHINA NAT OFFSHORE OIL CORP
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