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Preparation method of cathode material for lithium-air battery and lithium-air battery

A technology of lithium-air battery and cathode material, applied in the field of electrochemical energy, can solve the problems of poor conductivity of non-carbon cathode, limit the discharge process of lithium-air battery, affect the overall performance of the battery, etc., and achieve increased contact area and catalytic active sites. Increase and promote the effect of reversible formation and decomposition

Inactive Publication Date: 2018-06-15
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing a positive electrode material of a lithium-air battery and a lithium-air battery, aiming to solve the problem that the non-carbon positive electrode of the existing lithium-air battery has poor conductivity, limits the discharge process of the lithium-air battery, and affects the overall performance of the battery

Method used

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  • Preparation method of cathode material for lithium-air battery and lithium-air battery
  • Preparation method of cathode material for lithium-air battery and lithium-air battery
  • Preparation method of cathode material for lithium-air battery and lithium-air battery

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preparation example Construction

[0034] Please refer to figure 1 , figure 1 A flow chart of a method for preparing a positive electrode material for a lithium-air battery provided in an embodiment of the present invention, the method includes:

[0035] Step 101: Growth of Co on Ni foam substrate using hydrothermal reaction 3 O 4 Precursor.

[0036] Step 102: For Co 3 O 4 The precursor is calcined to make the Co 3 O 4 Conversion of precursors to Co 3 O 4 , to obtain Ni-loaded Co 3 O 4 (i.e. Co 3 O 4 @Ni non-carbon cathode material).

[0037] Step 103: Load the Ni with Co 3 O 4 Soak in NaBH 4 In the solution, after taking it out, it is washed with deionized water and dried to obtain a non-carbon cathode material for lithium-air batteries (that is, r-Co 3 O 4 @Ni non-carbon cathode material).

[0038] The method for preparing a positive electrode material for a lithium-air battery provided by the present invention makes Co grown on a foamed nickel substrate through a hydrothermal process and low...

Embodiment 1

[0053] The pretreatment process of nickel foam is: cut the untreated nickel foam into 3.2*5cm 2 The rectangular pieces were placed in an acetone solution for 5 min to remove surface oil stains, rinsed with deionized water for several times, and then ultrasonically cleaned with 3M HCl for 15 min to remove surface oxides. Then rinse with absolute ethanol and deionized water for 3-5 times in turn, and place it in an oven to dry for use.

[0054] The preparation process of the cathode material is as follows:

[0055] Weigh 0.8731g of Co(NO 3 ) 2 ·6H 2 O (3 mmol) and 0.72 g of urea (12 mmol) were placed in a 100 mL clean beaker, poured into 40 mL of deionized water, and magnetically stirred until the raw materials were completely dissolved and the solution was pink. The solution was transferred to a 50 mL reaction kettle with a polytetrafluoroethylene lining, the above-mentioned dried and ready-to-use nickel foam rectangular sheet was placed along the inner wall of the inner li...

Embodiment 2

[0060] The pretreatment process of nickel foam is: cut the untreated nickel foam into 3.2*5cm 2 The rectangular pieces were placed in an acetone solution for 5 min to remove surface oil stains, rinsed with deionized water for several times, and then ultrasonically cleaned with 3M HCl for 15 min to remove surface oxides. Then rinse with absolute ethanol and deionized water for 3-5 times in turn, and place it in an oven to dry for use.

[0061] The preparation process of the cathode material is as follows:

[0062] The first step, the hydrothermal process, grows Co on the nickel foam substrate 3 O4 Precursor:

[0063] Weigh 0.8731g of Co(NO 3 ) 2 ·6H 2 O (3 mmol) and 0.72 g of urea (12 mmol) were placed in a 100 mL clean beaker, poured into 40 mL of deionized water, and magnetically stirred until the raw materials were completely dissolved and the solution was pink. The solution was transferred to a 50 mL reaction kettle with a Teflon lining, and the rectangular nickel foa...

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Abstract

The invention belongs to the field of electrochemical energy and particularly relates to a preparation method of a cathode material for a lithium-air battery and the lithium-air battery. A Co3O4@Ni nanowire array prepared by using a hydrothermal process has larger specific surface area; porous structures and ideal specific surfaces of nanowires are obtained by the low-temperature calcination process, and further the contact area between electrolyte and an electrode is increased, therefore, more reactive sites are provided for ORR and OER processes. The surfaces of the nanowires become rough after the nanowires are soaked; with the rough surfaces, the specific surface area of the nanowires is increased and a greater storage space is provided for discharge products. In addition, Co3O4 is reduced after the nanowires are soaked, oxygen vacancies and surface defects are increased and catalytic active sites are also increased, so that reversible formation and decomposition of a weak crystalline film-like discharge product on the surface of a catalyst are favorably promoted, therefore, the integral performance of the lithium-air battery is significantly improved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, and in particular relates to a method for preparing a positive electrode material for a lithium-air battery and a lithium-air battery. Background technique [0002] Lithium-air batteries have ultra-high energy density, which is 6-9 times that of lithium-ion batteries, and is almost equivalent to traditional fossil fuel gasoline. [0003] Lithium-air batteries use metal lithium as the negative electrode, and the porous diffusion layer is the air positive electrode. During the discharge process, the chemical energy of lithium and oxygen is converted into electrical energy, and during the charging process, the discharge products (Li in the non-aqueous system) are decomposed. 2 O 2 and LiOH in water system to store electrical energy. Due to the insolubility and insulating properties of the discharge products, their irreversible and incomplete decomposition results in poor reversibility and cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08B82Y30/00
CPCB82Y30/00H01M4/8605H01M4/88H01M4/9016H01M12/08Y02E60/10
Inventor 王芳孟诚诚吴其兴曹慧群吴磊王慧罗仲宽
Owner SHENZHEN UNIV
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