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Lithium air battery based on a lithium alloy negative electrode

A lithium-air battery, lithium alloy technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc., can solve the problems of short cycle life, low energy efficiency, poor safety, etc. Achieve the effect of optimizing the negative electrode interface, inhibiting the occurrence of lithium dendrites, and simple process

Active Publication Date: 2019-04-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although lithium-air batteries have excellent application prospects, however, their development is still constrained by many conveniences, such as low energy efficiency, short cycle life, and poor safety.
Among them, the active lithium metal negative electrode is very prone to lithium dendrites during the electrochemical cycle of the battery. In addition, the lithium metal negative electrode has to endure continuous erosion from electrolyte, dissolved oxygen, water, carbon dioxide, etc. Ultimately leading to premature end of battery life

Method used

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  • Lithium air battery based on a lithium alloy negative electrode
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  • Lithium air battery based on a lithium alloy negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The porous air electrode, electrolyte system, and lithium-aluminum alloy negative electrode used in lithium-air batteries are as follows:

[0045] Porous air electrode: Nitrogen-doped graphene airgel material is used as a porous air electrode catalyst, loaded on the surface of carbon paper, and its loading amount is 0.2mg. For detailed preparation methods, see: Huanhuan Guo, Guangmei Hou, Jiangguang Guo, Xiaohua Ren, Xiaoxin Ma, Linna Dai, Shirui Guo, Jun Lou, Jinkui Feng, Lin Zhang, Pengchao Si, and Lijie Ci. Enhanced Cycling Performance of Li-O 2 Battery byUsing a Li 3 PO 4 -Protected Lithium Anode in DMSO-Based Electrolyte. ACS Appl. Energy Mater. 2018, 1, 5511-5517.

[0046] Electrolyte system: 1M LiTFSI lithium salt was dissolved in TEGDME solvent to form an electrolyte, and 100 microliters of the electrolyte was dropped on the glass fiber separator.

[0047] Lithium alloy negative electrode: a lithium aluminum alloy with an aluminum content of 2wt% is used as t...

Embodiment 2

[0056] The porous air electrode, electrolyte system, and lithium alloy negative electrode used in lithium-air batteries are as follows:

[0057] Porous air electrode: Nitrogen-sulfur double-doped graphene airgel material is used as a porous air electrode catalyst, which is loaded on the surface of carbon paper with a loading capacity of 0.3 mg.

[0058] Electrolyte system: 1M LiFSI lithium salt was dissolved in TEGDME solvent to form an electrolyte, and 100 microliters of the electrolyte was dropped on the glass fiber separator.

[0059] Lithium alloy negative electrode: a lithium aluminum alloy with an aluminum content of 5wt% is used as the negative electrode, and the porous air electrode, electrolyte and negative electrode are assembled in an Ar-containing atmosphere glove box to form a lithium-air battery. The lithium-air cell is vented to pure argon, and at 1.5mA cm -2 Pretreatment was carried out for 40 cycles at a higher current density to form a composite protective f...

Embodiment 3

[0061] The porous air electrode, electrolyte system, and lithium alloy negative electrode used in lithium-air batteries are as follows:

[0062] Porous air electrode is the same as embodiment 1;

[0063] Electrolyte system is the same as embodiment 1;

[0064] Lithium alloy negative electrode: a lithium-magnesium alloy with a magnesium content of 3wt% is used as the negative electrode, and the porous air electrode, electrolyte and negative electrode are assembled in an Ar-containing atmosphere glove box to form a lithium-air battery. The Li-air battery is supplied with pure oxygen and at 2.0mA cm -2 Pretreatment was carried out for 20 cycles at a higher current density to form a composite protective film containing magnesium oxide in situ on the surface of the lithium-magnesium alloy, and then the battery was placed in a pure oxygen atmosphere at 0.15mAcm -2 Normal electrochemical cycle tests were performed at lower current densities.

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Abstract

The invention discloses a lithium air battery based on a lithium alloy negative electrode. The lithium air battery using lithium alloy as a negative electrode is placed in an anhydrous gas atmospherefor at least one cycle of high current pretreatment, wherein the current density of the high current pretreatment is not less than 0.8 mAh.cm<-2>. An oxide film composite SEI protective film containing heterogeneous metal is formed on the surface of the battery through high current pretreatment before normal cycle test, so that the erosion of the electrolyte, water, dissolved oxygen and carbon dioxide in the lithium air battery on the negative electrode can be blocked, the lithium ions can be guided to be uniformly deposited on the surface of the negative electrode, the occurrence of lithium dendrites can be inhibited, and the cycle stability and safety of the battery are greatly improved.

Description

technical field [0001] The invention relates to a lithium-air battery based on a lithium alloy negative electrode, belonging to the technical field of lithium batteries. Background technique [0002] The statements herein merely provide background information related to the present invention and may not necessarily constitute prior art. [0003] In modern society, human beings are facing severe fossil energy crisis and environmental pollution, which hinders the development of fuel vehicles. In recent years, pure electric vehicles or hybrid electric vehicles have attracted more and more social attention, and the effective use of battery systems has greatly reduced human dependence on fossil fuels. However, the actual energy density of the most widely used lithium-ion batteries on the market is too low to meet human needs for long-distance transportation. Lithium-air batteries use metal lithium as the negative electrode and oxygen as the reaction electrode, which greatly imp...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M4/134
CPCH01M4/134H01M12/08Y02E60/10
Inventor 慈立杰郭焕焕
Owner SHANDONG UNIV
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