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Electrolyte additive, electrolyte containing same, lithium ion battery and apparatus

An electrolyte additive and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of restricting the development of high-voltage lithium-ion batteries, poor cycle performance, and reduced charging and discharging efficiency of lithium-ion batteries To achieve the effect of optimizing the surface film of positive and negative electrodes, improving cycle performance, and inhibiting further contact

Inactive Publication Date: 2018-12-18
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the carbonates of conventional lithium-ion batteries are easy to decompose at a high charge cut-off voltage (greater than 4.3V), this will lead to a decrease in the charge-discharge efficiency of the lithium-ion battery and poor cycle performance, which restricts the use of high-voltage lithium-ion batteries. further development of
[0004] In the prior art, there is no report on the related technology that boron trifluoride complexes can improve the electrochemical performance of lithium-ion batteries at higher charge cut-off voltages through the synergistic effect of electron-withdrawing groups such as oxygen and phosphorus.

Method used

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  • Electrolyte additive, electrolyte containing same, lithium ion battery and apparatus
  • Electrolyte additive, electrolyte containing same, lithium ion battery and apparatus
  • Electrolyte additive, electrolyte containing same, lithium ion battery and apparatus

Examples

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Effect test

preparation example Construction

[0103] The preparation method of this electrolyte can refer to as follows:

[0104] (a) removing impurities and water after purifying the organic solvent;

[0105] In this step, it is preferred to mix the cyclic carbonate solvent and the linear carbonate solvent to obtain a mixed organic solvent, and then remove impurities and water from the mixed organic solvent;

[0106] (b) adding the lithium salt to the organic solvent after the impurity removal in step (a), to obtain the basic electrolyte;

[0107] (c) adding an electrolyte additive having a mass of 0.5 to 3% of the basic electrolyte to the basic electrolyte obtained in step (b), to obtain the electrolyte;

[0108] At the same time, in step (b), by adjusting the amount of lithium salt added, the concentration of lithium salt in the obtained electrolyte is controlled at about 1.0 mol / L.

[0109] The electrolyte solution prepared by the above method can be further used to prepare a corresponding lithium secondary battery....

Embodiment 1

[0117](1) cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) by mass ratio EC:EMC:DEC=3:5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0118] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration of the conductive lithium salt is 1.0mol / L, and stir evenly to obtain the basic electrolyte;

[0119] (3) Boron trifluoride tetrahydrofuran complex is added to the basic electrolyte prepared in step (2) in an amount of 1% of the mass of the basic electrolyte to obtain the final electrolyte.

Embodiment 2-3、 comparative example 1

[0121] Except the following table 1 parameter, other parameters and preparation method of embodiment 2-3 and comparative example 1 are the same

[0122] Example 1.

[0123] Table 1 embodiment 2-3, comparative example 1 electrolyte composition parameter

[0124]

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Abstract

The invention provides an electrolyte additive, an electrolyte containing the same, a lithium ion battery and an apparatus. The liquid electrolyte additive comprises at least one of compounds represented by the formula (I) and formula (II). The additive of the present invention is capable of for a dense and stable SEI film layer on the positive and negative electrode surfaces in the first-time charge and discharge process, optimizes positive and negative electrode surface films, inhibits the surface activity of the electrodes, protects an electrode material, inhibits further contact between the electrolyte and electrode active material, reduces oxidative decomposition of an electrolyte main solvent on the electrode surfaces, and improves cycle performance of a lithium ion secondary batteryunder high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to an electrolyte additive, an electrolyte containing the same, a lithium-ion battery and equipment. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, and notebook computers due to their advantages such as high working voltage, large specific capacity, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. and other portable electronic equipment. [0003] With the application in electric vehicles, wireless electric tools and military, higher requirements are put forward for the energy density of lithium secondary batteries. Due to LiNi 0.8 co 0.1 mn 0.1 o 2 With other high-nickel ternary materials, lithium-ion deintercalation reactions can occur at a higher charge cut-off voltage (greater than 4.3V), which brings new hope for impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 汪志华苗力孝
Owner 桑德新能源技术开发有限公司
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