Preparation method for amorphous carbon positive electrode of lithium-air battery and lithium-air battery

A lithium-air battery, non-carbon technology, applied in the field of electrochemical energy, can solve the problems of reducing Coulombic efficiency, affecting battery performance, and easy decomposition of carbon materials, so as to reduce the overpotential of charge and discharge, improve the sharp drop of discharge voltage, and easily decompose Effect

Inactive Publication Date: 2017-06-20
SHENZHEN UNIV
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Problems solved by technology

However, carbon materials, as the positive electrode of lithium-air batteries, will promote the decomposition of the electrolyte to generate Li during the discharge process. 2 CO 3 and LiRCO 3 and other by-products, during the charging process Li 2 CO 3 Decomposition causes the charging voltage to exceed 4V, but the carbon material is also easy to decompose when it exceeds 3.5V, thereby reducing the Coulombic efficiency and affecting battery performance

Method used

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  • Preparation method for amorphous carbon positive electrode of lithium-air battery and lithium-air battery
  • Preparation method for amorphous carbon positive electrode of lithium-air battery and lithium-air battery
  • Preparation method for amorphous carbon positive electrode of lithium-air battery and lithium-air battery

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preparation example Construction

[0036] The embodiment of the present invention provides a method for preparing a non-carbon positive electrode of a lithium-air battery, comprising the following steps:

[0037] a. Growth of Co on Ni foam substrate by hydrothermal reaction 3 o 4 Precursor;

[0038] b. Calcining in air, the Co 3 o 4 The precursor is transformed into Co 3 o 4 , forming Co 3 o 4 @Ni non-carbon positive electrode (loaded Co 3 o 4 foam nickel electrode);

[0039] c. First load Ni with Co 3 o 4 Soak in RuCl 3 solution, followed by high-temperature treatment under the protection of argon to obtain RuO 2 / Co 3 o 4 @Ni non-carbon cathode (RuO 2 Modified Co 3 o 4 @Ni electrode).

[0040] The preparation method of the lithium-air battery non-carbon positive electrode provided by the embodiment of the present invention uses a hydrothermal process to make nanowire-like Co 3 o 4 The precursor is grown on the foamed nickel substrate, and the precursor is converted into the metal oxide Co...

Embodiment 1

[0066] The pretreatment process of foamed nickel is: cut the untreated foamed nickel into 3.2*5cm 2 The rectangular slices were placed in an acetone solution and ultrasonically removed for 5 minutes to remove surface oil stains. After multiple rinses with deionized water, they were ultrasonically cleaned with 3M HCl for 15 minutes to remove surface oxides. Then rinse with absolute ethanol and deionized water for 3-5 times in turn, and dry in an oven for use.

[0067] The preparation process of the positive electrode is: sequentially weigh 0.8731g of Co(NO 3 ) 2 ·6H 2 O (3mmol) and 0.72g of urea (12mmol) were placed in a clean 100mL beaker, poured into 40mL of deionized water, and stirred magnetically until the raw materials were completely dissolved and the solution was pink. Transfer the solution to a 50mL reaction kettle with a polytetrafluoroethylene liner, place the dry nickel foam rectangle piece along the inner wall of the liner, and lock the reaction kettle. Place t...

Embodiment 2

[0070] Foam nickel pretreatment process is identical with embodiment 1

[0071] The manufacturing process of the positive electrode:

[0072] The first step, a hydrothermal process, allowed the growth of Co on the foamed nickel substrate 3 o 4 Precursor:

[0073] Sequentially weigh 0.8731g of Co(NO 3 ) 2 ·6H 2 O (3mmol) and 0.72g of urea (12mmol) were placed in a clean 100mL beaker, poured into 40mL of deionized water, and stirred magnetically until the raw materials were completely dissolved and the solution was pink. Transfer the solution to a 50mL reaction kettle with a polytetrafluoroethylene liner, place the dry nickel foam rectangle piece along the inner wall of the liner, and lock the reaction kettle. Place the reaction kettle in an oven at 100-120°C for 6 hours. After the hydrothermal treatment, the reactor was naturally cooled, and the nickel foam loaded with the precursor was taken out, rinsed with absolute ethanol and deionized water for 3-5 times, and dried ...

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Abstract

The invention is applicable to the field of electrochemical energy sources, in particular to a preparation method for an amorphous carbon positive electrode of a lithium-air battery and the lithium-air battery. The preparation method comprises the following steps of growing a Co3O4 precursor on a foamed nickel substrate by hydrothermal reaction; performing calcination in air, and converting the Co3O4 precursor to Co3O4 to form a Co3O4@Ni amorphous carbon positive electrode; and immersing Ni-loaded Co3O4 in a RuCl3 solution, and performing high-temperature processing under the protection of argon to acquire a RuO2 / Co3O4@Ni amorphous carbon positive electrode. According to the preparation method for the amorphous carbon positive electrode of the lithium-air battery, provided by the invention, a Co3O4 nanowire is directly grown on the foamed nickel substrate by the hydrothermal process and low-temperature calcination, the conductivity of a transition metal oxide is improved by a RuO2 modified nanowire, and the prepared Co3O4@Ni nanowire array has relatively large specific area.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, and in particular relates to a preparation method of a non-carbon positive electrode of a lithium-air battery and a lithium-air battery. Background technique [0002] With the excessive use of non-renewable fossil fuels, problems such as global warming and environmental pollution are becoming more and more serious, and the development of green and sustainable new energy has become a key issue that needs to be solved urgently by all mankind. Among them, lithium-air batteries have attracted great interest from researchers all over the world because of their higher theoretical specific energy and storage density. [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 the discharge product (non-aqueous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M4/04H01M4/36H01M4/525
CPCH01M4/04H01M4/366H01M4/525H01M12/06Y02E60/10
Inventor 王芳吴其兴孟诚诚冯景华罗仲宽
Owner SHENZHEN UNIV
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