Thermal Behavior Investigation of LiNi1/3Co1/3Mn1/3O2-Based Li-ion Battery under Overcharged Test |
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Authors: | Wang Haiyan Tang Aidong Huang Kelong |
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Institution: | School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China |
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Abstract: | Thermal behavior of its components such as separator, electrolyte, cathode, anode, and each binder were investigated by differential scanning calorimetry and thermal gravimetric (DSC/TG) to explain thermal runaway mechanism of Li‐ion battery under overcharged test. DSC results indicated the decomposition reaction temperature of SEI (solid electrolyte interface) layer in anode was at about 126°C. It was found that heat generation in anode under normal charged state increased obviously with the increasing of charged voltage. When the battery was overcharged to 4.6 V or 5.0 V, the onset temperature and heat generation of thermal reaction in anode changed a little, while those in cathode had large increase. It was proposed that thermal behavior in cathode mainly caused by the reaction of electrolyte with evolutional oxygen played a key role to thermal runaway for the studied Li‐ion battery under overcharged test. |
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Keywords: | lithium‐ion battery LiNi1/3Co1/3Mn1/3O2 thermochemistry calorimetry overcharge |
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