Method for reducing charge and discharge polarization of lithium air battery with nonaqueous electrolytic solution

A lithium-air battery and electrolyte technology, applied in secondary battery charging/discharging, fuel cell-type half-cells and secondary battery-type half-cells, secondary battery repair/maintenance, etc., can solve battery cost, energy Adverse impact of density, high charge and discharge polarization, restricting development and application, etc., to improve bulk charge transport capability and reduce charge and discharge polarization

Inactive Publication Date: 2015-02-18
四川省有色冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]At present, non-aqueous electrolyte lithium-air batteries have high charge and discharge polarization (the initial charge-discharge voltage difference is about 1.7 V), which leads to low energy efficiency of the battery and severely restricts its development and application
In order to reduce the charge-discharge polarization of lithium-air batteries, changing the composition of the positive electrode material (such as adding a catalyst) or the composition of the electrolyte (such as adding a redox medium) is one of the options, but for the cost of the battery, energy density, etc. have adverse effects

Method used

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  • Method for reducing charge and discharge polarization of lithium air battery with nonaqueous electrolytic solution
  • Method for reducing charge and discharge polarization of lithium air battery with nonaqueous electrolytic solution
  • Method for reducing charge and discharge polarization of lithium air battery with nonaqueous electrolytic solution

Examples

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Effect test

Embodiment 1

[0032] A discharged battery is charged at 70°C, 60°C, and 50°C, and compared with a battery charged at room temperature.

[0033] The positive electrode of the discharged battery adopts Li 2 O 2 It is mixed with the binder PVDF according to the mass ratio of 80:20. After thorough grinding and mixing, an appropriate amount of NMP is added dropwise. After ultrasonic dispersion, the above-mentioned slurry is coated on the foamed nickel current collector, and vacuum dried at 100 ℃ for 2 h After cooling to room temperature, the desired positive electrode is obtained.

[0034] The battery assembly is carried out in a glove box filled with argon protection. The electrolyte is 0.65 M LiTFSI DME / DOL mixed solvent (volume ratio 1:1), and the injection volume is about 800 μL. The positive electrode of the battery is the discharged positive electrode prepared above, the negative electrode is a metal lithium sheet, and the separator is Celgard 2350. When assembling, first put in the negative ...

Embodiment 2

[0037] After discharging the charged battery at 70℃, 60℃, and 50℃, compare it with the battery discharged at normal temperature. The cut-off capacity for discharge at 70°C, 60°C, 50°C and normal temperature is 1 mAh to ensure the same amount of discharge products when used for subsequent charging. Subsequently, considering that the state of the discharged products at different temperatures may be inconsistent, the four batteries in the discharged state were charged at the same charging temperature (70°C).

[0038] The positive electrode of the rechargeable battery adopts a carbon electrode. By adding a 60% PTFE solution to an appropriate amount of deionized water, while ultrasonically dispersing, add an appropriate amount of isopropanol and superconducting carbon black Super P (Super P and PTFE mass ratio 7:3) and continue Ultrasonic dispersion. Subsequently, the slurry was coated on a stainless steel mesh current collector, vacuum dried at 200°C for 12 h, and the desired positi...

Embodiment 3

[0042] Use rechargeable batteries to discharge and charge at 70°C, 60°C, and 50°C, and compare with batteries that are discharged and charged at room temperature. The charge and discharge current is 0.05 mA cm -2 , The charge cut-off voltage is 3.8V, the charge reaction can reach more than 90%, when the discharge voltage is 2.4V, the discharge reaction can reach more than 90%, the charged battery is discharged at 70℃, 60℃, 50℃, and the discharge cut-off The voltage 2.4V completes the discharge reaction, and then the battery in the discharged state is charged at 70°C, 60°C, and 50°C until it reaches the charge cut-off voltage of 3.8V to complete the charging reaction. The battery experiment at room temperature is the same as above.

[0043] The positive electrode of the rechargeable battery adopts a carbon electrode. By adding a 60% PTFE solution to an appropriate amount of deionized water, while ultrasonically dispersing, add an appropriate amount of isopropanol and superconductin...

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Abstract

The invention discloses a method for reducing the charge and discharge polarization of a lithium air battery with a nonaqueous electrolytic solution. According to the method, the purpose of reducing the charge and discharge polarization of the lithium air battery with the nonaqueous electrolytic solution can be achieved on the basis of neither increasing the battery cost nor reducing the energy density of the battery; the method is simple and easy to realize.

Description

[0001] technical field [0002] The invention relates to the field of lithium-air batteries, in particular to a method for reducing charge-discharge polarization of a non-aqueous electrolyte lithium-air battery. Background technique [0003] Energy promotes and affects the development and progress of human society, and is related to national security strategies. Energy reform has become an important task for governments of various countries, and research and development of new green and environmentally friendly secondary batteries is an important part of this work. At present, the energy density of the widely used and developed secondary battery systems such as lithium-ion batteries still cannot meet the needs of practical applications, especially in fields such as electric vehicles that require high energy density chemical power systems. Lithium-air batteries (also known as lithium-oxygen batteries) have the highest energy density (theoretical 11450 Wh Kg -1 ), the actua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M12/08
CPCH01M10/44H01M12/08Y02E60/10
Inventor 李海英宋明万宁黄小丽黄宗令
Owner 四川省有色冶金研究院有限公司
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