Method for testing pressure resistance of porous material

By measuring the relative change rate of specific surface area of ​​porous materials to evaluate their voltage resistance, the problem of performance degradation caused by volume changes during charging and discharging of silicon-carbon composite materials is solved, and a rapid and accurate quantity evaluation of the voltage resistance of porous materials is achieved.

CN119715125AActive Publication Date: 2025-03-28INNER MONGOLIA YIJIN NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411864307.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-28
Estimated Expiration
2044-12-17

AI Technical Summary

Technical Problem

During the charging and discharging process, the existing silicon-carbon composite anode materials have broken particles, lost electrical contact and lost active substances due to volume changes, resulting in low first efficiency, poor circulation performance, and poor mechanical strength of the porous carbon skeleton, which is prone to cracking, resulting in bare silicon leakage and degradation of battery performance.

Method used

The pressure resistance performance is characterized by measuring the relative change rate of specific surface area of ​​a porous material. The specific steps include testing the initial specific surface area, performing compression treatment, measuring the specific surface area after pressure, and evaluating the pressure resistance performance based on the relative change rate of specific surface area.

Benefits of technology

This method can quickly and accurately characterize the pressure resistance of porous materials, with accurate detection results and simple operation, suitable for industrial applications, and help evaluate the structural strength and stability of porous materials under pressure conditions.

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Abstract

The invention belongs to the technical field of pressure resistance measurement of porous materials, and particularly relates to a method for testing the pressure resistance of a porous material. The specific surface area of the porous material is tested to obtain initial specific surface area data; pressing the porous material in a mold to obtain a pressed material sample; testing the specific surface area of the pressed material sample to obtain pressed specific surface area data; the specific surface area relative change rate of the porous material is obtained according to a formula 1, the pressure resistance of the porous material is represented by the specific surface area relative change rate of the porous material, and the smaller the specific surface area relative change rate of the porous material is, the higher the pressure resistance of the porous material is. The testing method provided by the invention can quantitatively characterize the pressure resistance of the porous material, and is high in accuracy, simple and quick to operate and suitable for industrial application.
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