NMR in-situ battery test accessories and test methods

Abstract

This patent relates to a battery accessory for nuclear magnetic resonance in-situ testing, including a battery fixing frame, a cylindrical shell, a pressurized nut, a first fixing cover with a central through hole, a first sealing ring, a second sealing ring, a first insulating seal Pad, first current collector, positive electrode sheet, separator, negative electrode sheet, second current collector, second insulating gasket, third sealing ring, fourth sealing ring and second fixed cover with central through hole. The invention has the advantages of simple device, good sealing performance, convenient loading and unloading operation, and can efficiently realize in-situ on-line detection of the battery in a nuclear magnetic resonance spectrometer. The patent also discloses a test method for in-situ detection of battery charging and discharging process using a nuclear magnetic resonance spectrometer.

Description

technical field [0001] The invention designs the field of batteries, specifically a battery for in-situ detection by using nuclear magnetic resonance, and realizes in-situ on-line detection of battery charging and discharging reactions. Background technique [0002] In recent years, with the development of technology, various advanced batteries such as lithium-ion batteries, lithium-sulfur batteries, lithium-air batteries, and sodium-ion batteries have been widely used in various electronic products, including electric vehicles, mobile phones, computers, wireless Man-machine and so on. At the same time, people have higher and higher requirements for the performance of these products such as long battery life and fast response, which poses greater challenges to battery capacity, cycle stability and other performance. Therefore, a deep understanding of the charge-discharge reaction process in batteries is particularly important for improving battery performance. Nuclear magn...

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Problems solved by technology

[0003] At present, a large number of studies have used NMR methods to characterize the positive electrode materials, negative electrode materials and electrolytes of batteries to study the structural properties of these materials. At the same time, in-situ NMR studies have also been carried out on battery materials at different charge and discharge stages, but these studies are not It is carried out under ex-situ conditions and cannot truly reflect the structural changes during charging and discharging in the battery

Due to the complexity and limitations of the NMR spectrometer itself, it is necessary to develop a battery device with a special structure to study the charging and discharging process of the battery. Most of the existing in-situ battery devices are used in X-ray diffraction and spectral analysis. and other fields, and most of these in situ batteries have complex structures and battery devices are too large to be directly applied to NMR methods

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