Thermal behavior of its components such as separator, electrolyte, cathode, anode, and each binder were inves- tigated by differential scanning calorimetry and thermal gravimetric （DSC/TG） to explain thermal runaway...Thermal behavior of its components such as separator, electrolyte, cathode, anode, and each binder were inves- tigated 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℃. 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.展开更多
基金Project supported by the National Natural Science Foundation of China （No. 50542004） and Graduate Degree Thesis Innovation Foundation of Central South University （No. 1960-71131100017）.
文摘Thermal behavior of its components such as separator, electrolyte, cathode, anode, and each binder were inves- tigated 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℃. 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.
