Porous ruthenium dioxide and manganese dioxide combined electrode and preparation method and application thereof

A composite electrode and porous technology is applied in the field of porous RuO2/MnO2 composite electrode and its preparation, and achieves the effects of easy decomposition, improved electrochemical performance and simple preparation process

Inactive Publication Date: 2015-08-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Porous ruthenium dioxide and manganese dioxide combined electrode and preparation method and application thereof
  • Porous ruthenium dioxide and manganese dioxide combined electrode and preparation method and application thereof
  • Porous ruthenium dioxide and manganese dioxide combined electrode and preparation method and application thereof

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Embodiment 1

[0041] KMnO 4 and 96 wt% H 2 SO 4 (molar mass KMnO 4 0.01) was dissolved in deionized water, stirred evenly, prepared with K + A solution with a concentration of 0.01mol / L. Use nickel foam as a matrix, immerse in the above solution, then transfer it into a reaction kettle, seal it and keep it in an oven at 85°C for 1 hour, then rinse it with deionized water and absolute alcohol several times, and dry it in a vacuum oven at 60°C for 12 Hours later, the manganese-containing precursor supported on Ni was obtained; the obtained manganese-containing precursor supported on Ni was calcined at 300 ° C for 2 hours in an Ar atmosphere, and then cooled to room temperature to obtain MnO2 supported on nickel foam. 2 Electrode (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.3mg / cm 2 ; The above-mentioned MnO carried on the nickel foam 2 The electrode is immersed in RuCl 3 (Concentration: 4mg / mL), soaked for 3 hours, rinsed with deionized water and absolute ethanol several times,...

Embodiment 2

[0059] KMnO 4 and 96 wt% H 2 SO 4 (molar mass KMnO 4 0.04) was dissolved in deionized water, stirred evenly, prepared with K + A solution with a concentration of 0.02mol / L. Use nickel foam as a matrix, immerse in the above solution, and then transfer it into a reaction kettle, seal it and keep it in an oven at 70°C for 1.5 hours, then rinse it with deionized water and absolute alcohol several times, and dry it in a vacuum oven at 60°C for 12 hours. Hours later, the manganese-containing precursor supported on Ni was obtained; the obtained manganese-containing precursor supported on Ni was calcined at 400 ° C for 1 hour in an Ar atmosphere, and then cooled to room temperature to obtain MnO supported on nickel foam. 2 Electrode (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.4mg / cm 2 ; The above-mentioned MnO carried on the nickel foam 2 The electrode is immersed in RuCl 3 (Concentration: 4 mg / mL), soaked for 5 hours, rinsed with deionized water and absolute ethanol s...

Embodiment 3

[0064] KMnO 4 and 96 wt% H 2 SO 4 (molar mass KMnO 4 0.02) was dissolved in deionized water, stirred evenly, prepared with K + A solution with a concentration of 0.01mol / L. Use foamed nickel as a matrix, immerse in the above solution, then transfer it into the reaction kettle, keep it in a 90°C oven for 0.5 hours after sealing it, then rinse it with deionized water and absolute alcohol several times, and vacuum dry it in a 60°C oven for 12 Hours later, the manganese-containing precursor supported on Ni was obtained; the obtained manganese-containing precursor supported on Ni was calcined at 300 ° C for 2.5 hours in an Ar atmosphere, and then cooled to room temperature to obtain MnO2 supported on nickel foam. 2 Electrode (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.25mg / cm 2 ; The above-mentioned MnO carried on the nickel foam 2 The electrode is immersed in RuCl 3 (Concentration: 3 mg / mL), soaked for 1.5 hours, rinsed with deionized water and absolute ethanol sev...

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Abstract

The invention discloses a preparation method of a porous ruthenium dioxide and manganese dioxide combined electrode. The preparation method of the porous ruthenium dioxide and manganese dioxide combined electrode comprises the following steps of mixing potassium permanganate, thick sulfuric acid and deionized water, obtaining mixed solution after evenly stirring, immersing substrate and obtaining a substrate-loaded precursor comprising manganic after hydrothermal reaction of 60 to 110 DEG C water; roasting the substrate-loaded precursor comprising manganic under 200 to 500 DEG C under argon atmosphere and obtaining manganese dioxide which is loaded on the substrate after cooling; mixing ruthenium chloride and water to obtain ruthenium salt solution, immersing the manganese dioxide which is loaded on the substrate to the ruthenium salt solution and performing aftertreatment to obtain the porous ruthenium dioxide and manganese dioxide combined electrode. According to the porous ruthenium dioxide and manganese dioxide combined electrode, the porous manganese dioxide directly grows on the substrate, nano ruthenium dioxide particles are loaded on the porous manganese dioxide, and a porous structure is maintained after loading of the ruthenium dioxide.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a porous RuO 2 / MnO 2 Composite electrode and its preparation method and application. Background technique [0002] Lithium-air battery is a new type of energy storage device that uses metallic lithium as the negative electrode, air (or oxygen) as the positive electrode, and a lithium ion conductor as the electrolyte. The theoretical energy density of lithium-air batteries is as high as about 3500Wh / kg. Considering the weight of catalysts, electrolytes, battery packaging, etc., the actual available energy density of lithium-air batteries is still over 1000Wh / kg, which is much higher than that of nickel-hydrogen (50Wh / kg), lithium-ion (160Wh / kg), lithium-ion Energy densities of sulfur (370Wh / kg), zinc-air (350Wh / kg) batteries. [0003] Due to its high energy density, lithium-air batteries have important application prospects in th...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/50H01M12/06H01M4/131H01M4/36
CPCH01M4/049H01M4/131H01M4/362H01M4/50H01M12/06H01M2004/021Y02E60/10
Inventor 谢健王国卿刘双宇曹高劭赵新兵
Owner ZHEJIANG UNIV
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