In situ observation of lithium dendrite on the electrode in a lithium-ion battery |
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Authors: | ZHU Jianyu FENG Jiemin GUO Zhansheng |
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Affiliation: | 1Shanghai Institute of Applied Mathematics and Mechanics,Shanghai 200072,China; 2Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai 200072,China; 3Department of Mechanics,College of Science,Shanghai University,Shanghai 200444,China |
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Abstract: | Lithium-ion batteries (LIBs) are the state-of-the-art power sources for portable electronic devices. Furthermore, LIBs have now emerged as the most promising power source for electric vehicles, hybrid vehicles and plug-in hybrid vehicles. LIBs have some safety problems, such as the formation of lithium dendrite which can cause internal short-circuiting. In this paper, the cyclic performance of electrode in commercial lithium-ion battery is studied with a macro-micro experiment. Electrochemical experiment is carried at room temperature with small current G and the generation, growth, dissolution and residue of lithium dendrite are observed. It reveals that lithium dendrite can be formed not only under large-current overcharge or low-temperature charge but also under small current and at room temperature. It has been found that lithium dendrite appears in the late charge, stretching straightly, and its tip topography remains unchanged. Lithium dendrite begins dissolving when discharge, whose tip morphology still unchanged, and dead lithium residues on the electrode after fully discharge. |
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Keywords: | lithium-ion battery in situ observation lithium dendrite dead lithium |
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