Lithium Ion Batteries
Degradation Analysis of Electrode Surface

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Summary

In the lithium battery, degradations such as a decline in the battery capacity and an increase in the resistance of the positive and negative electrodes occur, depending on the charging and discharging cycle and the storage conditions.

A comprehensive analysis is made of the factors in a decline in the battery capacity and an increase in the resistance by investigating the compositional and morphological changes in the materials, increase in the modified product material and changes in the chemical conditions of Li and Co that have occurred before and after degradations.

SEM observation of the negative electrode surface before and after storage test

The fine structure of the surface can be observed at high resolution by bringing acceleration voltage to a very low level of 1kV or lower. The negative electrode surface before and after the test was observed with SEM, and it was confirmed that the amount of deposits had increased conspicuously after the test.

XPS condition analysis before and after storage test

A comparison of P2p narrow spectrums obtained before and after the test indicates that after the test, the amount of the components derived from LiPF6 decreased and the amount of its decomposition products, namely, phosphates (LiPFxOy and POx,, etc.) , increased.

Search Number 9025

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