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A method for preparing a sodium iron acid for high-temperature molten salt battery-ironic acid 镧 electrode material method

A technology of high-temperature molten salt and lanthanum ferrite, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of high-temperature resistance of electrode materials, complex synthesis methods, and high sintering temperatures. Achieve the effect of short drying time, simple reaction conditions and low sintering temperature

Active Publication Date: 2022-03-29
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In order to solve the problems of complex material synthesis method, high sintering temperature and common electrode materials not resistant to high temperature and poor performance at high temperature in the above-mentioned prior art, the present invention provides a sodium ferrite-iron co-precipitation preparation for high temperature molten salt battery. Lanthanum acid heterostructure nano electrode material method

Method used

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  • A method for preparing a sodium iron acid for high-temperature molten salt battery-ironic acid 镧 electrode material method
  • A method for preparing a sodium iron acid for high-temperature molten salt battery-ironic acid 镧 electrode material method
  • A method for preparing a sodium iron acid for high-temperature molten salt battery-ironic acid 镧 electrode material method

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Experimental program
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Effect test

Embodiment 1

[0034] Add 0.03mol of lanthanum nitrate and 0.07mol of ferric nitrate into 200mL of deionized water, stir at 50-60°C for 2 hours until the lanthanum nitrate and ferric nitrate are completely dissolved, then add 50ml of sodium hydroxide solution at room temperature after cooling (the content of sodium hydroxide is 0.3mol) to obtain the precipitation mixture of lanthanum hydroxide and ferric hydroxide. After fully washing and centrifuging, place it in an oven and dry at 60-80°C for 24 hours to obtain a solid mixture of lanthanum and iron. Use a mortar to grind the solid mixture into powder, and place the powder sample in Aluminum oxide flakes were placed in a crucible and annealed at 400°C for 6 hours to obtain a lanthanum ferrite material. The XRD diffraction pattern, SEM scanning pattern and Coulombic efficiency pattern of the lanthanum ferrite material are as follows figure 1 , figure 2 and image 3 As shown, the sodium ferrite-lanthanum ferrite (ie sodium ferrite and lant...

Embodiment 2

[0036] Add 0.01mol of lanthanum nitrate and 0.09mol of ferric nitrate into 200mL of deionized water, stir at 50-60°C for 2 hours until the lanthanum nitrate and ferric nitrate are completely dissolved, then add 25ml of sodium hydroxide solution at room temperature after cooling (the content of sodium hydroxide is 0.3mol) to obtain the precipitation mixture of lanthanum hydroxide and ferric hydroxide. The mixed product was directly centrifuged and then dried in an oven at 60-80°C for 24 hours to obtain a solid mixture of lanthanum and iron. The solid mixture was ground into powder with a mortar, and the powder sample was Place it on an alumina sheet, put it into a crucible and anneal at 500°C for 6 hours to obtain a lanthanum ferrite material. The XRD diffraction pattern, SEM scanning pattern and Coulombic efficiency pattern of the lanthanum ferrite material are as follows Figure 4 , Figure 5 and Figure 6 As shown, the sodium ferrite-lanthanum ferrite heterostructure nanoe...

Embodiment 3

[0038] Add 0.07mol of lanthanum nitrate and 0.03mol of ferric nitrate into 200mL of deionized water, stir at 50-60°C for 2 hours until the lanthanum nitrate and ferric nitrate are completely dissolved, then add 25ml of sodium hydroxide solution at room temperature after cooling (the content of sodium hydroxide is 0.3mol) to obtain the precipitation mixture of lanthanum hydroxide and ferric hydroxide. The mixed product was directly centrifuged and then dried in an oven at 60-80°C for 24 hours to obtain a solid mixture of lanthanum and iron. The solid mixture was ground into powder with a mortar, and the powder sample was Place it on an alumina sheet, put it into a crucible and anneal at 500°C for 6 hours to obtain a lanthanum ferrite material. The XRD diffraction pattern, SEM scanning pattern and Coulombic efficiency pattern of the lanthanum ferrite material are as follows Figure 7 , Figure 8 and Figure 9 As shown, the sodium ferrite-lanthanum ferrite heterostructure nanoe...

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Abstract

The invention relates to a method for co-precipitating sodium ferrite-lanthanum ferrite heterostructure nano-electrode materials for high-temperature molten salt batteries, which comprises dissolving lanthanum nitrate and ferric nitrate in water; adding sodium hydroxide solution to obtain hydroxide A solid mixture of lanthanum and ferric hydroxide; the solid mixture is ground into a powder, and the powder is annealed at 400°C-600°C to obtain a sodium ferrite-lanthanum ferrite heterostructure nano-electrode material. According to the method for preparing sodium ferrite-lanthanum ferrite heterogeneous nano-electrode material by co-precipitation of the present invention, the metal salt is lanthanum nitrate and ferric nitrate, the precipitating agent is sodium hydroxide that can provide sodium element, and the low melting point of sodium is used to reduce the Synthesis temperature, that is, compared with the annealing temperature of 700-1000°C in the prior art, the present invention can form the lanthanum ferrite phase at a lower temperature of 400-600°C, and by adjusting the input of the molar ratio of lanthanum to iron, the formation Impurity-free sodium ferrite-lanthanum ferrite heterostructure nanoelectrode material.

Description

technical field [0001] The invention relates to a material with a perovskite structure, and more specifically relates to a method for co-precipitating a sodium ferrite-lanthanum ferrite heterostructure nano-electrode material for high-temperature molten salt batteries. Background technique [0002] High-temperature molten-salt batteries have great prospects and potentials as energy storage batteries due to their extremely high theoretical energy density and low battery cost. At the current stage of research, it also shows good battery stability, and its stability still has more room for improvement in future development. In the high-temperature field, ordinary electrode materials are difficult to be effectively used. [0003] Perovskite oxide (Perovski-type oxide) originally only refers to CaTiO 3 , later referred to with CaTiO 3 A general term for a series of compounds that have the same structure and may contain other elements, the structure and composition of which can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/525H01M4/04H01M10/39B82Y30/00
CPCH01M4/52H01M4/525H01M4/0471H01M10/399B82Y30/00Y02E60/10
Inventor 王建强彭程姜文程李威唐忠锋张诗雨高江辉金孟媛王昊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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