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In the experiment, XaverMonnighoff used a 18650 battery structure (NMC532/C), which was subjected to cyclic detection (2.75V-4.2V) at 20 ° C and 45 ° C in a 1C/1C system. The end-of-life EOL was located at 70% of the initial capacity, and the detected battery was disassembled in a glove box. The extracted cells were extracted using supercritical carbon dioxide extraction equipment, and then the separated electrolyte was decomposed into components using a gas chromatograph.

The following figure shows the gas chromatograph decomposition results of the electrolyte extracted from a brand new battery, from which common solvents and additives in the electrolyte can be seen.

The cycling performance curves of the battery at 20 ℃ and 45 ℃ are shown in the following figure. From the results, it can be seen that temperature has a significant impact on the cycling performance of the battery. Batteries cycling at 45 ℃ have better cycling performance, with a cycling frequency of around 1500 cycles at the end of their lifespan. However, the cycling performance of the battery at 20 ℃ is very poor, with only about 300 cycles reaching the end of their lifespan. The decomposition suggests that, The main reason for the poor cycling performance of batteries at 20 ℃ is the co embedding of PC solvents and the peeling of graphite layers.

The following figure shows the gas chromatographic decomposition results of the electrolyte obtained from the new battery and the 20 ℃ and 45 ℃ cycling batteries. In order to facilitate the decomposition of XaverMonnighoff, the decomposition results were divided into three parts, namely 3-7 minutes, 7-10 minutes, and 10-13 minutes. In Zone 1, the electrolyte of the new battery tested three peaks, corresponding to EMC and monofluorophosphate EMFP (possibly due to VC analysis during battery formation and SEI film formation), as well as VC. Only EMC and EMFP were found in the electrolyte of the 45 ℃ cycling battery, indicating that VC had been completely consumed during the film forming process. Multiple analytical products were found in the battery cycling at 20 ℃. From the images, EMC (peak 1), DMFP (peak 2), and EMFP (peak 5) were observed, as well as three other products containing propylene chains (peaks 3, 4, and 6), namely methyl isopropyl carbonate (peak 3 MiPrC), methyl propyl carbonate (peak 4 MPrC), and 1,2-diethoxypropane (peak 6). VC was not tested.

The formation mechanism of the products corresponding to peaks 1, 2, and 5 has been reported, while the products corresponding to peaks 3, 4, and 6 have not been reported yet. After decomposition, XaverMonnighoff believes that the germination activity mechanism of products 3, 4 is shown in the following equation. The formation mechanism of the product corresponding to peak 6 may be the ring opening reaction of PC solvent,

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