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High-voltage-resistant fast-charging lithium ion battery electrolyte as well as preparation method and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as phase transition at the positive electrode electrolyte interface, achieve the effects of improving cycle performance, reducing chain length, and high charging voltage

Active Publication Date: 2020-11-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an electrolyte containing fluorine and / or boron lithium salt and phenol derivatives as additives, which can solve the problem of a more dense, stable and complete positive electrode-electrolyte interface film (CEI) , can also solve the problem of phase transition at the positive electrolyte interface, and at the same time improve the cycle performance and rate performance of lithium-ion secondary batteries under high voltage conditions

Method used

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  • High-voltage-resistant fast-charging lithium ion battery electrolyte as well as preparation method and application thereof
  • High-voltage-resistant fast-charging lithium ion battery electrolyte as well as preparation method and application thereof
  • High-voltage-resistant fast-charging lithium ion battery electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a high-voltage-resistant fast-charging lithium ion battery electrolyte as well as a preparation method and application thereof. The electrolyte comprises electrolyte salt, an organic solvent, a first additive and a second additive, wherein the first additive is a functional lithium salt, the functional lithium salt containsfluorine and / or boron, the second additive is a phenol derivative containing at least one substituent group, the substituent group is located at the ortho-position or para-position of a phenolic hydroxyl group, and the HOMO energy level of the second additive is higher than that of the electrolyte salt and the organic solvent. The additive disclosed by the invention can prevent side reaction at an electrode electrolyte interface, inhibit irreversible phase change of a positive electrode active material under high voltage, and accelerate transmission of Li < + > at the interface in a chargingand discharging process, so that the cycle performance and the rate capability of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to an electrolyte solution for a high-voltage fast-charging lithium-ion battery and a preparation method and application thereof. Background technique [0002] Layered lithium transition metal oxide materials are representative cathode materials for lithium-ion batteries. In order to increase the specific capacity of layered transition metal oxide cathodes, higher nickel content is required. However, increasing the Ni content in high-Ni ternary cathode materials can lead to instability of the electrode-electrolyte interface. When the charging and discharging voltage is high (>4V), a series of interfacial reactions will occur between the cathode material and the electrolyte, resulting in a rapid decline in the cycle performance and rate performance of the battery. Second, at a high state of charge, Ni 4+ It will migrate from the bulk phase to the surface along th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 方淳程方圆韩建涛
Owner HUAZHONG UNIV OF SCI & TECH
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