Lithium-sulfur battery capable of monitoring internal state change in real time and preparation and monitoring methods thereof

Abstract

The invention belongs to the field of lithium-sulfur battery monitoring, and particularly discloses a lithium-sulfur battery capable of monitoring internal state change in real time and a preparation and monitoring method thereof.The preparation method comprises the following steps that an optical fiber sensor penetrates into a three-dimensional foamed aluminum current collector, then the three-dimensional foamed aluminum current collector is coated with sulfur positive electrode slurry, and a pole piece is obtained; the pole piece is used as a battery positive electrode for packaging to obtain the lithium-sulfur battery capable of monitoring internal state change in real time. During monitoring, the optical fiber sensor on the lithium-sulfur battery is connected with the optical fiber demodulator, another optical fiber sensor is fixed in the external environment where the lithium-sulfur battery is located to serve as an environment optical fiber, the lithium-sulfur battery is charged and discharged, and the optical fiber demodulator demodulates signals acquired by the optical fiber sensor on the lithium-sulfur battery and the environment optical fiber at the same time. And obtaining the internal state monitoring information of the lithium-sulfur battery after the influence of the environmental factors is removed. Therefore, the real-time monitoring of the state change in the battery in the charging and discharging process is realized under the condition that the normal operation of the battery is not influenced.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery monitoring, and more specifically relates to a lithium-sulfur battery capable of real-time monitoring of internal state changes and a preparation and monitoring method thereof. Background technique [0002] Lithium-sulfur battery is a secondary battery system that uses sulfur as the positive electrode active material and metal lithium as the negative electrode material. Its theoretical energy density is as high as about 2600Wh kg -1 , and sulfur element has the advantages of environmental friendliness and low price. With the increasing demand for energy, new high-energy secondary batteries such as lithium-sulfur batteries have attracted great attention. Different from commercial lithium-ion batteries based on lithium-ion deintercalation reactions, the charge-discharge reaction of lithium-sulfur batteries is based on the conversion reaction of two elements, sulfur and lithium. Taking the disc...

AI Technical Summary

Problems solved by technology

[0003] In order to monitor the reaction process of lithium-sulfur batteries, the existing technology often discharges the battery to different depths, then disassembles the battery, and uses ex-situ detection methods such as X-ray diffraction, Raman spectroscopy, and ultraviolet-visible spectrophotometry. Analyze the reactions that occur during the charging and discharging process, but these methods are difficult to achieve real-time monitoring, and often can only detect the type of substance in a static state, which is not sensitive to changes in the state of matter, and is expensive and complex in equipment structure

Moreover, the step of discharging the battery to different depths and disassembling the battery adds to the complexity of monitoring

Furthermore, some products generated during the battery reaction will chemically react with components such as water in the air, which greatly increases the difficulty of detection

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