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
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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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