Characterization method of silicon oxide-amorphous carbon composite material for negative electrode of lithium ion battery

Abstract

The invention discloses a characterization method of silicon oxide-amorphous carbon composite material for a negative electrode of a lithium ion battery. The characterization of a large area of the silicon oxide-amorphous carbon composite material is realized by Raman spectrum mapping characterization method. The uniformity of the coating of the amorphous carbon on the surface of the silicon oxidein the silicon oxide-amorphous carbon composite material can be quickly evaluated by analyzing and comparing the data of Raman spectrum mapping images.

Description

technical field [0001] The invention relates to the field of silicon oxide-amorphous carbon composite materials for negative electrodes of lithium-ion batteries, in particular to a characterization method for silicon oxide-amorphous carbon composite materials for negative electrodes of lithium-ion batteries. Background technique [0002] Silicon and silicon-containing materials are considered to be a promising negative electrode material with a theoretical specific capacity of up to 4200mAh / g. Although the capacity of silicon oxide is not as high as that of pure silicon negative electrodes, the strength of the Si-O bond is higher than that of Si -2 times the bond strength of Si, and the Li formed during the first week of reaction 2 O compounds also have a buffering effect on volume expansion, so their cycle performance is far superior to that of silicon, thus attracting the attention of many researchers. [0003] At present, Korean and Japanese material manufacturers have l...

AI Technical Summary

Problems solved by technology

However, the performance of carbon-coated silicon oxide produced by different manufacturers is very different, and the main reason is that the uniformity of carbon coating is different.

At present, the evaluation of the amorphous carbon coating on the surface of the material is mainly based on the measurement of the content of carbon in the material to measure the coating status in the macroscopic aspect, and the material is characterized by the transmission electron microscope in the microscopic aspect, but both methods have limitations. , Measuring the carbon content in the material can only determine the amount of amorphous carbon in the material but cannot evaluate the uniformity of the coating; using transmission electron microscopy to characterize the material can accurately observe the coating of the material and measure the thickness of the coating, but High cost and unrepresentative test results

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