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Lithium air battery and manufacturing method thereof

A technology for a lithium-air battery and a manufacturing method, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as hindering charge transfer, high voltage, battery deterioration, etc., and achieve the effect of increasing capacity

Pending Publication Date: 2020-04-21
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to form lithium oxide, which reduces the capacity of the battery
In addition, some lithium oxides that are not reduced during battery charging exist as side reaction deposits, which hinder the transport of charges, thereby causing high resistance and high voltage
Therefore, the battery may deteriorate due to the decomposition of the electrolyte

Method used

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  • Lithium air battery and manufacturing method thereof
  • Lithium air battery and manufacturing method thereof
  • Lithium air battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0093] (1) Form a seed layer on the carbon positive electrode

[0094] 1M LiNO 3 (lithium-based compound) was mixed with dimethylacetamide (DMAc) to prepare a composition for seed formation. Graphite carbon and polytetrafluoroethylene (PTFE) binder were dry-blended at a weight ratio of 9:1, and then self-contained electrodes were used to fabricate carbon positive electrodes. At this time, the thickness of the carbon positive electrode was 200 μm, and the amount of carbon material loaded to make the carbon positive electrode was 5 mg / cm 2 .

[0095] The carbon positive electrode is soaked in the composition for seed crystal formation, and the pressure of 2 bar, 0.5mA / cm 2 A current was supplied to the composition for seed crystal formation at a current of 2.0 for 10 hours to perform electrolysis. At this time, the charge-discharge cycle was repeated five times to form a seed layer having a thickness of 2 to 3 nm on one surface of the carbon positive electrode.

[0096] (2)...

experiment Embodiment 1

[0102] Experimental Example 1: Composition analysis of the seed layer on the carbon positive electrode.

[0103] Measurement was performed using X-ray photoelectron spectroscopy (XPS) to analyze the composition of the seed layer formed on the carbon positive electrode manufactured according to the example. A pure carbon positive electrode (Pristine) and a carbon positive electrode having a seed layer thereon manufactured according to the above-mentioned examples were measurement samples. The results are shown in Figure 4 to Figure 7 middle.

[0104] Figures 4 to 7 is a graph showing the binding energies of elements (carbon, nitrogen, oxygen, and lithium) detected from the seed layer formed on the carbon positive electrode according to the example. see Figure 4 , it can be seen that the carbon element has a peak at about 285eV. However, since the carbon element of the carbon positive electrode according to the embodiment has a lower strength than that of the pure carbon...

experiment Embodiment 2-1

[0106] Experimental Example 2-1: Analysis of gas in a lithium-air battery during initial charge and discharge.

[0107] By using a differential electrochemical mass spectrometer (DEMS), a gas analyzer, the charge and discharge potentials of the lithium-air batteries fabricated according to Examples and Comparative Example 1 and the gas generated therein during initial charge and discharge thereof, such as O 2 and CO 2 amount of gas. At 2 bar pressure, 0.5mA / cm 2 Under the conditions of current of 2.0 V and voltage of 2.0 V, current was supplied to the lithium-air battery in an oxygen atmosphere for 120 minutes to perform each charging and discharging operation. The results are shown in Figures 8A to 12B middle.

[0108] Figure 8A , 9A 10A and 10A are graphs showing charge and discharge potentials of lithium-air batteries manufactured according to Examples after being charged and discharged once, three times and five times, respectively. refer to Figure 8A , it can b...

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Abstract

The present disclosure relates to a lithium air battery and a manufacturing method thereof. A seed layer for inducing the growth of thin-film type discharge products is formed on a carbon positive electrode. The number of reaction regions that can react with lithium ions is increased, whereby high-speed discharging is possible. Since the seed layer induces the growth of the thin-film type discharge products, high-speed charging is also possible. In addition, since the seed layer induces the growth of the thin-film type discharge products, it is possible to increase the capacity of the battery.Furthermore, the occurrence of overvoltage in the lithium air battery is reduced, whereby the lifespan of the battery is increased while the stability of the battery is improved.

Description

technical field [0001] The present disclosure relates to a lithium-air battery including a negative electrode capable of storage and release, and a positive electrode using oxygen in the air. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Li-air batteries typically include a negative electrode capable of storing and releasing lithium ions, and a positive electrode that uses oxygen in the air as the positive electrode active material. The positive electrode includes an oxygen evolution and reduction catalyst, and an electrolyte disposed between the negative electrode and the positive electrode. Li-air batteries have very high energy density because oxygen in the air is used as the positive electrode active material, thus attracting considerable attention as next-generation batteries. [0004] When a lithium-air battery is discharged, lithium gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M4/13H01M4/134H01M4/1395
CPCH01M12/06H01M4/13H01M4/134H01M4/1395H01M4/382H01M4/8657H01M4/88H01M4/96H01M12/08H01M2004/8689H01M2300/0068Y02E60/10H01M4/583
Inventor 吴光锡宋种灿
Owner HYUNDAI MOTOR CO LTD
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