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Electrolyte containing triethyl borate additive as well as preparation method and application thereof

A technology of triethyl borate and electrolyte, which is used in circuits, electrical components, secondary batteries, etc., can solve the degradation of electrical properties such as battery charge and discharge cycles, the unstable structure of layered lithium-rich materials, and the change of positive electrode material morphology. and other problems, to achieve the effect of optimizing the surface film of positive and negative electrodes, improving cycle performance and inhibiting surface activity

Inactive Publication Date: 2016-01-13
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, while increasing the voltage of the positive electrode material, the electrical properties of the battery such as charge and discharge cycles are declining. On the one hand, the reason is that the structure of the layered lithium-rich material is not stable enough, and on the other hand, it is the matching problem of the electrolyte.
Conventional commercial electrolytes are easy to oxidize and decompose on the surface of the positive electrode of the battery at a high potential of 5V. The oxidative decomposition reaction of the electrolyte itself will also promote malignant reactions such as morphology changes and structural collapse of the positive electrode material.

Method used

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  • Electrolyte containing triethyl borate additive as well as preparation method and application thereof
  • Electrolyte containing triethyl borate additive as well as preparation method and application thereof
  • Electrolyte containing triethyl borate additive as well as preparation method and application thereof

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Effect test

Embodiment 1

[0029] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are mass ratio EC: EMC: DMC=3: 5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0030] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0031] (3) Add 1% triethyl borate of the electrolyte mass to the common electrolyte prepared in step (2), to obtain a high-voltage electrolyte for lithium-ion batteries.

[0032] The high-voltage electrolyte of the lithium-ion battery prepared in this embodiment is compared with the ordinary electrolyte obtained in step (2) for discharge cycle performance, and the results are as follows figure 1 shown. Depend on figure 1 It can be seen that the high-voltage electrolyte prepared in this exam...

Embodiment 2

[0035] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are mass ratio EC: EMC: DMC=3: 5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0036] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, stir evenly, and make common electrolyte;

[0037] (3) Add 2% triethyl borate of the electrolyte mass to the common electrolyte prepared in step (2), to obtain a high-voltage functional electrolyte for lithium-ion batteries.

Embodiment 3

[0039] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are mass ratio EC: EMC: DMC=3: 5: 2 Mixing, using molecular sieve, calcium hydride, lithium hydride to purify and remove impurities and water;

[0040] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, stir evenly, and make common electrolyte;

[0041] (3) Add 3% triethyl borate of electrolyte mass to the common electrolyte prepared in step (2), to obtain a high-voltage functional electrolyte for lithium-ion batteries.

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Abstract

The invention belongs to the technical field of lithium ion batteries and discloses electrolyte containing a triethyl borate additive as well as a preparation method and application thereof. The electrolyte comprises a conductive lithium salt, an organic solvent and the triethyl borate additive. By using the triethyl borate additive, a positive electrode / electrolyte interface is optimized, the surface activity of a positive electrode is reduced and oxidative decomposition of the electrolyte is inhibited; and the cycling and rate performance of the lithium batteries which take high voltage (4.8V) rich lithium as a positive electrode material can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte solution containing a triethyl borate additive and a preparation method and application thereof. Background technique [0002] With the advancement of science and technology, the requirements for energy storage devices in the fields of electronic products, electric vehicles, medical equipment, and aerospace are increasing. Lithium-ion batteries with high energy density, small size, and long cycle life are widely used. At present, the positive electrode materials of commercial lithium-ion batteries mainly include lithium manganese oxide, lithium cobalt oxide, ternary materials, and lithium ferrous borate. The charging cut-off voltage generally does not exceed 4.2V. With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium batteries. The...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 李伟善李健辉卢其伦邢丽丹王再盛涂文强唐贤文杨茹
Owner SOUTH CHINA NORMAL UNIVERSITY
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