期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 118, 期 3, 页码 1413-1418出版社
SPRINGER
DOI: 10.1007/s10973-014-4094-7
关键词
Li4Ti5O12/LiMn2O4; Overcharge; Electrochemical performance; Thermal runaway; Electrode material
资金
- project of Science and Technology of Guangzhou City [11A51020737]
- Key Technical Project of Strategic Emerging Industries of Guangdong Province [2011A010802001]
- International S&T Cooperation Program of China (ISTCP) [2013DFG50150]
The electrochemical properties and thermal generation behavior of 18650 Li4Ti5O12/LiMn2O4 batteries were tested before and after overcharge. The experimental results showed that after overcharge, the specific capacity decreased obviously. The higher the current density was, the more obvious the capacity decreased. For instance, the overcharged battery had almost no capacity when the current density increased to 5C. At the same time, the overcharged battery presented a much more apparent thermal runaway trend compared to the normal battery. After measuring the electrochemical impedance spectroscopy of the batteries and characterizing the crystal structure/nanostructure of the electrode materials, these phenomena could be attributed to the following two reasons: (1) the decomposition of the electrolyte arisen from the overcharge process resulted in increased internal resistance; (2) the thermal runaway due to the increased internal resistance resulted in the damage to crystal structure/nanostructure and aggregation of the electrode materials, thus leading to the secondary decrease in capacity.
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