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Electrolyte solution, preparation method thereof and use thereof

An electrolyte solution and organic solvent technology, applied in the field of lithium batteries, can solve the problems of lithium storage capacity attenuation, reducing active substances, affecting charge and discharge properties, etc.

Inactive Publication Date: 2010-03-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) At the same time, the P-F bond is very sensitive to water, even a trace amount of water will trigger the following reaction: LiPF 6 +H 2 O→POF 3 +LiF+2HF(2), PF 5 +H 2 O→POF 3 +2HF(3), the HF generated by formula (2) and formula (3) will promote the dissolution of the positive electrode material, making its lithium storage capacity gradually decay
(2) Product Li 2 O. Li 2 o 2 It is an electronic insulator and insoluble in organic solvents. In the air electrode, as the reaction progresses, it will fill the gaps in the electrode, block the diffusion of gas, and significantly reduce the active material Li. 2 O. Li 2 o 2 The electrical contact with the current collector affects the charging and discharging properties

Method used

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  • Electrolyte solution, preparation method thereof and use thereof
  • Electrolyte solution, preparation method thereof and use thereof
  • Electrolyte solution, preparation method thereof and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Weigh 1.3g LiF as component A and 25.6g TPFPB as component B in a beaker, add 25ml propylene carbonate (PC) as component D and 25ml dimethyl carbonate (DMC) as component D after drying Part D, and then stirred by a magnetic stirrer for 1 hour to become a transparent electrolyte solution. Weigh 0.485 g of LiBOB as component C, add it into the previously prepared electrolyte solution, and stir for 1 hour with a magnetic stirrer. Ready to use. All the above operations were performed in an atmosphere filled with argon.

[0039] The electrolyte was added dropwise to a glass conductivity cell with platinum electrodes at both ends, and its conductivity was measured in the range of 5Hz-13MHz using an HP4192 impedance spectrometer, and the measured conductivity at 25°C was 3.2ms / cm. Used in conjunction with GDW6005 high and low temperature test chamber to measure the conductivity of samples at different temperatures. Using CHI627C electrochemical workstation, with the method o...

Embodiment 2

[0045] Weigh 1.3g LiF as component A and 25.6g TPFPB as component B in a beaker, add 25ml ethylene carbonate (EC) as component D and 25ml diethylcarbonate (DEC) as component D after drying Part D, and then stirred by a magnetic stirrer for 1 hour to become a transparent electrolyte solution. Weigh 0.388 g of LiBOB as component C, add it into the previously prepared electrolyte solution, and stir for 1 hour with a magnetic stirrer. Ready to use. All the above operations were performed in an atmosphere filled with argon.

[0046] The electrolyte was dropped into a glass conductivity cell with platinum electrodes at both ends, and its conductivity was measured in the range of 5 Hz-13 MHz using an HP4192 impedance spectrometer, and the measured conductivity at 25°C was 3.1 ms / cm. Used in conjunction with GDW6005 high and low temperature test chamber to measure the conductivity of samples at different temperatures. Using CHI627C electrochemical workstation, with the method of cy...

Embodiment 3

[0049] Weigh 1.3g LiF as component A and 25.6g TPFPB as component B in a beaker, add 25ml propylene carbonate (PC) as component D and 25ml ethylene carbonate (EC) as component D after drying , and then stirred by a magnetic stirrer for 1 hour to become a transparent electrolyte solution. Weigh 0.243 g of LiBOB as component C, add it into the previously prepared electrolyte solution, and stir for 1 hour with a magnetic stirrer. Ready to use. All the above operations were performed in an atmosphere filled with argon.

[0050] The electrolyte was dropped into a glass conductivity cell with platinum electrodes at both ends, and its conductivity was measured in the range of 5 Hz-13 MHz using an HP4192 impedance spectrometer, and the measured conductivity at 25°C was 3.1 ms / cm. Used in conjunction with GDW6005 high and low temperature test chamber to measure the conductivity of samples at different temperatures. Using CHI627C electrochemical workstation, with the method of cyclic...

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Abstract

The invention provides electrolyte solution, which contains an organic solvent, a lithium salt or lithium oxide, a compound containing an electron-withdrawing group and an additive, wherein the solvent is a carbonic ester and / or ether solvent; and the additive is a compound having a molecular formula of RBC2O4Li, R in the formula may be -C2O4, -F2, -C6H2O2, alkyl or fluorine-containing substitutedalkyl, and the concentration of the additive in the electrolyte solution is 0.005 to 0.1mol / l. The invention also provides a preparation method of the electrolyte solution. The invention also provides a lithium cell, which comprises a lithium cell diaphragm soaked in the electrolyte solution. The electrolyte solution of the invention has the advantages of high transport number of lithium ions, high conductivity and wide electrochemical window. Meanwhile, the electrolyte solution has high compatibility with a carbon cathode material.

Description

technical field [0001] The invention relates to an electrolytic solution and a preparation method and application of the electrolytic solution, and also relates to a lithium battery, which contains a separator soaked in the electrolytic solution. 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 bat...

Claims

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Application Information

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IPC IPC(8): H01M6/16H01M10/40H01M12/06
CPCY02E60/12
Inventor 李立飞李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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