A kind of electrolyte solution for high-voltage fast-charging lithium-ion battery and its preparation method and application
A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as phase transition at the positive electrode electrolyte interface, and achieve the effects of fast charging speed, high capacity retention rate, and broad market prospects
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Embodiment 1
[0057] Take a portion of 98.9 grams of basic electrolyte, add 1 gram of lithium difluorooxalate borate (LiDFOB) and 0.1 gram of I-1, the lithium difluorooxalate borate (LiDFOB) accounts for 1 wt% of the total mass of the electrolyte, and I-1 accounts for The electrolyte solution is 0.1% by weight of the total mass, and the finished product can be obtained after mixing evenly.
[0058] The difference between the preparation methods of Inventive Examples 2-16 and Comparative Example and Example 1 lies in the types of additives and the mass ratio of additives. For the sake of simplification of description, see Table 1 for details.
[0059] The whole parameter list of table 1 embodiment
[0060] Example first additive The weight ratio of the first additive Second additive The weight ratio of the second additive Example 1 LiDFOB 1wt% I-1 0.1wt% Example 2 LiDFOB 1wt% I-2 0.1wt% Example 3 LiDFOB 1wt% I-3 0.1wt% Example 4 Li...
Embodiment 3
[0084] It can be seen from the comparison of Examples 1-8, wherein, the I-3 effect of Example 3 and Example 7 is the best. The first is that the phenol derivative of I-3 has an ortho-position and a para-position substituent, and the two substituents are electron-donating groups, and the activity of the phenolic hydroxyl group is high. The second is that the functional group of the substituent is an amino group. Polymers have the ability to conduct ions. Especially in Example 3, the cycle stability of the battery under the synergistic effect of difluorooxalate lithium borate + I-3 is the best, the capacity retention rate after 200 cycles is as high as 88%, and the specific capacity at 20C high rate is 101mA h g -1 , which is much higher than that of other comparative test examples.
[0085] Therefore, the present application further studied the situation of I-3, set up Examples 9-16, and obtained the results shown in Table 4. Wherein when the concentration of fluorine / boron-c...
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