Method for measuring microscopic stress distribution of metal solid-state battery

Abstract

The invention discloses a method for measuring microscopic stress distribution of a metal solid-state battery, which solves the problem of lack of an efficient and reliable method for measuring stress distribution of the battery and provides a powerful tool for breaking through the technical bottleneck of development of all-solid-state batteries. The method is characterized by comprising the following steps of: preparing a solid-state battery with lithium metal attached to the surface of a solid-state electrolyte, and performing a sample after battery circulation; fixedly placing the sample on an adjusting table of a Raman spectrometer, and adjusting to enable the surface of the sample to be positioned on a focal plane; adjusting a working mode of the spectrometer to be regional surface scanning, and performing two-dimensional scanning on the sample; exporting spectral data acquired by scanning according to a scanning result; and processing the spectral data to obtain corresponding stress values and physical coordinates, and acquiring a surface microstress distribution state diagram after visualization processing. According to the method for measuring the microscopic stress distribution of the metal solid-state battery, the microscopic stress distribution state of the solid-state electrolyte can be obtained, and the method is efficient, simple, convenient and reliable.

Description

technical field [0001] The invention relates to the stress distribution technology of solid-state batteries, in particular to a method for measuring the microscopic stress distribution of metal solid-state batteries. Background technique [0002] The 2019 Nobel Prize in Chemistry was awarded to three pioneers of lithium-ion battery technology, which is the best affirmation of the achievements of lithium-ion batteries in the past. However, the trend of intelligent electrification has put forward higher requirements for lithium-ion battery technology. As the basic unit of energy storage, lithium-ion battery consists of positive and negative electrodes and electrolyte. In practical applications, energy density and safety are its two most important properties. However, traditional liquid lithium-ion batteries have great safety hazards due to the use of flammable liquid electrolytes. On the contrary, solid-state electrolytes can guarantee the normal operation of lithium-ion ba...

AI Technical Summary

Problems solved by technology

This problem of short battery cycle life due to the growth of lithium dendrites directly hinders the large-scale application of all-solid-state batteries. Therefore, it is extremely important to fully understand the growth mechanism of lithium dendrites in solid-state electrolytes to solve the problem.

Among the several important factors known to affect the microstructure of lithium dendrites, the microscopic current density, microscopic temperature, and electronic conductivity of the solid electrolyte have relatively complete and reasonable scientific methods that can be directly measured, but for the solid electrolyte Stress distribution measurement still lacks efficient and reliable methods, hindering the development of all-solid-state batteries

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