Battery electrolyte additive, electrolyte containing additive and application of electrolyte
An electrolyte additive and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor performance at room temperature and high temperature, and achieve the effects of reducing reactivity, preventing decomposition process, and good stability
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Embodiment 1
[0056] Preparation of electrolyte: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=1:1:1, and then add to the mixed solution Slowly add 12.5wt% lithium hexafluorophosphate based on the total weight of the electrolyte, 0.5wt% lithium bisfluorosulfonimide (LiTFSI) based on the total weight of the electrolyte and 2.5wt% lithium bisfluorosulfonimide based on the total weight of the electrolyte (LiFSI), finally add 1.0wt% of the compound with the structure shown in formula I based on the total weight of the electrolyte, 0.1wt% of the cyclic anhydride compound shown in the formula II, 2.0wt% vinyl sulfate (DTD) and 1.0 wt% fluoroethylene carbonate (FEC), and stir to obtain the lithium-ion battery electrolyte of Example 1.
[0057] Preparation of lithium-ion battery: stack the prepared positive electrode sheet, separator, and negative electrode sheet in order, so that the separator is in ...
Embodiment 2-12
[0058] Embodiment 2-12 and comparative example 1-9
[0059] In Examples 2-12 and Comparative Examples 1-9, except that the proportions of the components of the electrolyte are added as shown in Table 1, the others are the same as in Example 1. In addition, the structural formulas of the additives of formula I and additives of formula II in each embodiment are shown in Table 2.
[0060] Table 1 embodiment 1-12 and the composition ratio of each component of the electrolyte of comparative example 1-9
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[0064] Structural formula Ⅰ and structural formula Ⅱ specific material description in the embodiment of table 2
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[0067] Performance Testing
[0068] Performance tests were performed on the batteries prepared in Examples 1-12 and Comparative Examples 1-9.
[0069] (1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.35V at 1C constant current and constant voltage, with a cut-off cur...
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