Thermal Behavior Investigation of LiNi_1/3Co_1/3Mn_1/3O₂‐Based Li‐ion Battery under Overcharged Test

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 ℃. 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.

Thermal runaway of commercial 18650 Li-ion batteries with LFP and NCA cathodes – impact of state of charge and overcharge

“…In this section we compile a list of probable degradation reactions which may take place during thermal runaway. The most signicant chemical reactions may be reactions with O 2 and Li: partially delithiated cathodes release O 2 and partially lithiated anodes release Li at elevated temperatures ( 17), ( 20) and (21). Both released materials are highly reactive and promote a number of reactions that are summarized in a previous publication.…”

“…[18][19][20] It is known that the severity of the thermal runaway event in overtemperature experiments increases with increasing SOC. 4,[21][22][23][24][25][26][27] It is also known, that a thermal runaway can be triggered by strong overcharge beyond safe voltage limits of the cell. [28][29][30][31][32][33][34] Even if the overcharge condition does not trigger a thermal runaway, safety may be compromised by Li-plating on the anode.…”

Efficient sodium bisulfite-catalyzed synthesis of benzothiazoles and their potential as ureases inhibitors

“…48 However, we failed to obtain BZTs in yields higher than 42% under the optimized conditions described for benzimidazoles 48 when using CEM -Microwave-Enhanced Life reactor for organic synthesis instead of a domestic microwave oven. 53 Overall, our methodology for the synthesis of BZTs was proven to be efficient and interesting as it uses (i) mild conditions and NaHSO 3 , a cheap catalyst, (ii) short reaction time (30 min) due to the employment of MWI and (iii) an easy procedure (precipitation) for purifying the BZTs. 49,50 Under our experimental conditions, NaHSO 3 -catalyzed reactions yielded BZT-9 and BZT-11 in 100% while the use of the catalyst yttrium chloride (YCl 3 ) furnished these same BZTs in yields lower than 94%.…”

Amperometric Hydrogen Sensor Based on Solid Polymer Electrolyte and Titanium Foam Electrode

“…Recently, the rise of intelligent wearable electronic devices used in life, medical treatment, and sports as well as the development of transportation power systems, aerospace, and other fields have promoted the wide application of lithium-ion bateries (LIBs). , However, the damage of LIBs often causes serious safety accidents in a short time, which means that it is necessary to detect the damage of LIBs as early as possible. − At the same time, it is worth mentioning that trace hydrogen detection is an effective means of LIBs safety monitoring. The reason is that the thermal runaway caused by the overcharge of LIBs generate a large number of lithium (Li) dendrites under high temperature conditions, which react with the organic electrode solution binder to generate gases such as hydrogen. − According to the study of Yuan et al, trace hydrogen detection can advance the alarm time to 639 s before the smoking of the LIBs, which preliminarily illustrates the feasibility of the scheme …”