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Within the range of 7-10 min, FEC and diethyl fluorophosphate DEFP (peak 7) were tested in the electrolyte of the new battery, FEC could be tested in the battery cycled at 45 ℃, but FEC was not tested in the battery cycled at 20 ℃, which declared that all FEC had been consumed, and several other analytical products were tested, of which peak 8 corresponds to 2,2-di methoxyacetic acid methyl ester, and peak 9 is 2-methoxyethyl methyl carbonate, Peak 10 is TMP, which has also been reported in previous articles.

Within the range of 10-13 minutes, PS and methoxy-EC (peak 11) were tested in the electrolyte extracted from the new battery. methoxy-EC is a product of the reaction between VC and lithium methoxide LiOMe during the formation process. Due to the capture effect of VC on LiOMe, VC can inhibit the formation of alkanoates during the formation and cycling process (such as DMDOHC corresponding to peak 12 and EMDOHC corresponding to peak 15). The battery cycling at 45 ℃ can test the products corresponding to peaks 11 and 12, and there is also an analysis product whose structure cannot be determined. In addition to the products corresponding to peaks 11 and 12, the battery with a 20 ℃ cycle also tested six other analytical products. The following figure shows the formation mechanism of the analytical products corresponding to peak 13, and the product corresponding to peak 15 is EMDOHC, which may be a reaction product between EC and LiOMe or EMC and DMC. The specific decomposition of peak 16 revealed that the structure of the analyzed product contained two methoxy side chains, but more detailed structural information is currently unavailable. The decomposition of peak 17 revealed that the product corresponding to this peak contained side chains of methanol and propanolate, while the product corresponding to peak 18 contained side chains of two methanol salts.

From the above decomposition results, it can be seen that there are significant differences in the analysis products of the electrolyte for cycling batteries at 20 ℃ and 45 ℃. At 20 ℃, due to insufficient SEI film protection, many linear and cyclic carbonates in the electrolyte were analyzed, resulting in a rapid decline in battery performance at 20 ℃.

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