Electrolyte solution and preparation method and application thereof

An electrolytic solution, electron-withdrawing technology, applied in the field of materials

Active Publication Date: 2009-10-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] An object of the present invention is to provide a kind of electrolytic solution, it has improved the migration number of lithium ion in the electrolytic solution, has reduced the electrolytic solution of rechargeable battery to LiPF 6 Dependence, while solving the lithium-air battery and lithium-oxygen battery due to Li 2 O / Li 2 o 2 Problems caused by insolubility in organic electrolytes

Method used

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  • Electrolyte solution and preparation method and application thereof
  • Electrolyte solution and preparation method and application thereof
  • Electrolyte solution and preparation method and application thereof

Examples

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Embodiment 1

[0061] In a dry environment (relative humidity less than 2%), preferably in an inert gas glove box, anhydrous propylene carbonate (English abbreviation: PC, water content less than 50ppm), dimethyl carbonate (English abbreviation: DMC, water content preferably less than 50ppm) 1 liter each, in a container with a volume greater than 2 liters, mix well at room temperature. 12 g of anhydrous Li 2 O, put into the PC-DMC mixed solvent, then with 410 grams of perfluorinated triphenylboron, the chemical formula is (C 6 f 5 ) 3 B, the number B14 in the present invention is put into the mixed solvent, and it is completely dissolved after stirring at room temperature for 2 hours, that is, the electrolyte solution numbered 1 of the present invention is obtained. Through the standard Pt conductivity cell, adopt the AC impedance method, at different temperatures, measure the total ionic conductivity of this organic electrolytic solution, see the attached result figure 1 with table 1. ...

Embodiment 2-91

[0064] Similar to Example 1, in the glove box or in the drying room, the anhydrous organic solvent is mixed according to a certain volume ratio, and then the Li 2 O or Li 2 o 2 , according to a certain molar concentration into the mixed solvent, and then according to a certain molar concentration of the electron-withdrawing compound is added, stirred at room temperature for 1-5 hours, and dissolved to obtain the organic electrolyte solution of the present invention. See Table 1 for the type of solvent, volume ratio, type of lithium salt, molar concentration, type of electron-withdrawing compound, and molar concentration. The total ionic conductivity and lithium ion migration number are measured in the same manner as in Example 1, and the results are shown in Table 1.

Embodiment 92

[0066] This embodiment is the application of the organic electrolyte solution of the present invention as an electrolyte solution in a rechargeable lithium battery. In this embodiment, the application is tested by a simulated lithium battery that can be charged and discharged. Simulate lithium battery structure such as Figure 7 shown, is the H 2 Assembled in an argon-filled glove box with O content < 1.0ppm. Electrolyte is embodiment 1.

[0067] 99% lithium metal foil is used as the anode. LiFePO 4 The powder is mixed with acetylene black and 5% PVDF cyclohexane solution to form a slurry (the weight percentage of the three after drying is 85:10:5), and evenly coated on the aluminum foil substrate, and the obtained film is 5-40 μm. After drying the obtained film at 1500°C, at 20Kg / cm 2 Press down and continue drying at 1500°C for 12 hours. Then cut the film to an area of ​​1cm 2 The circular sheet serves as the cathode.

[0068] Will Figure 7 All battery materials, ...

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Abstract

The invention provides an electrolyte solution, which contains an organic solvent, a lithium oxide and an electron-withdrawing compound, wherein the organic solvent is a carbonic ester and / or ether organic solvent. The invention also provides a method for preparing the electrolyte solution. The electrolyte solution can be applied to the electrolyte solution in a rechargeable lithium battery. Simultaneously, the invention also provides a battery containing the electrolyte solution. The electrolyte solution has significant advantages of high lithium ion conductivity, more lithium transport number, good safety, good electrochemical stability and the like, and can effectively improve the service life, the safety and the charge-discharge multiplying power of the rechargeable lithium battery adopting the electrolyte solution. In the technical proposal of the invention, because the electrolyte solution does not depend on LiPF6 completely, the manufacturing cost is greatly reduced. When the electrolyte solution is applied to a lithium-air battery or a lithium-oxygen battery, the electrolyte solution has the significant advantages of small polarization, high capacity, reversible charging and discharging and the like.

Description

technical field [0001] The invention relates to an electrolyte solution and its preparation method and application, belonging to the field of material technology. Background technique [0002] Since the concept of rechargeable lithium batteries was proposed in the early 1970s, and then Sony (SONY) first realized its commercial application in the early 1990s, the basic research and application of rechargeable lithium batteries have rapidly become an international One of the hot spots in electrochemical research. The optimization and selection of organic electrolyte solutions is one of the most challenging tasks in the research of rechargeable lithium batteries. The organic electrolyte solution used in the rechargeable lithium battery is an electrolyte solution formed by dissolving an appropriate lithium salt in an organic mixed solvent. As an electrolyte solution for rechargeable lithium batteries, it should generally meet the following requirements: (1) High ion conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M2/16H01M50/417
CPCY02E60/122
Inventor 谢彬李泓黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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