Research on in-situ optical microscopic observation in lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2021.0212

Abstract

Abstract:

The in-situ optical microscopy equipment is increasingly used to observe the micro-behavior of the lithium ion batteries (LIBs). Herein, an in-situ optical microscopy system was used to observe the change of thicknesses and morphologies of the anodes during charging and discharging process for the pouch LIBs. The voltage-current curve, the thickness change of electrode and the morphological change of anodes were recorded simultaneously. The electrochemical and physical behavior of SiO/graphite composite anode with different ratio of SiO/graphite was studied. The thickness of fully charged anode increased as the content of SiO raised. When the percentage of SiO was raised to 12%, the anode material peeled off from the current collector,and it had a strong correlation with cycle performance of the cell. The lithium dendrite morphology at different charging and discharging rates was studied. When the charging current was small (0.05 C, 0.2 mA/cm²), whisker-like lithium dendrites were observed on the lithium metal electrode; the thicker branch-like lithium dendrites were observed when the charging current increased (0.25 C, 1.0 mA/cm²). The in-situ observation of macro-and micro-change of electrode morphology make the observation of the internal electrochemical process of batteries readily available, which will help people in the study of battery mechanism, failure analysis and battery modification.

Key words: lithium ion battery, optical microscopic system, in-situ observation, electrochemical reaction process, lithium dendrite

CLC Number:

TM 911

Jinhui GAO, Yinglong CHEN, Fanhui MENG, Meichao DING, Li WANG, Gang XU, Xiangming HE. Research on in-situ optical microscopic observation in lithium-ion batteries[J]. Energy Storage Science and Technology, 2022, 11(1): 53-59.

Figures/Tables 5

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