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Method for preparing sodium ferrite-lanthanum ferrite heterostructure nano electrode material for high-temperature molten salt battery through coprecipitation

A nano-electrode and heterostructure technology, applied in battery electrodes, nanotechnology for materials and surface science, electrode manufacturing, etc., can solve problems such as low temperature resistance of electrode materials, high sintering temperature, and complex synthesis methods

Active Publication Date: 2021-09-10
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing sodium ferrite-lanthanum ferrite heterostructure nano electrode material for high-temperature molten salt battery through coprecipitation
  • Method for preparing sodium ferrite-lanthanum ferrite heterostructure nano electrode material for high-temperature molten salt battery through coprecipitation
  • Method for preparing sodium ferrite-lanthanum ferrite heterostructure nano electrode material for high-temperature molten salt battery through coprecipitation

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Experimental program
Comparison scheme
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 Image 6 As shown, the sodium ferrite-lanthanum ferrite heterostructure nanoel...

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 preparing a sodium ferrite-lanthanum ferrite heterostructure nano electrode material for a high-temperature molten salt battery through coprecipitation. The method comprises the following steps: dissolving lanthanum nitrate and ferric nitrate in water; adding a sodium hydroxide solution to obtain a solid mixture of lanthanum hydroxide and ferric hydroxide; and grinding the solid mixture into powder, and annealing the powder at 400-600 DEG C to obtain the sodium ferrite-lanthanum ferrite heterostructure nano electrode material. According to the method for preparing the sodium ferrite-lanthanum ferrite heterogeneous nano electrode material by coprecipitation, the metal salts are lanthanum nitrate and ferric nitrate, the precipitator is sodium hydroxide capable of providing sodium element, and the synthesis temperature is reduced by utilizing the low melting point of sodium, namely, compared with the annealing temperature of 700-1000 DEG C in the prior art, a lanthanum ferrite phase can be formed at a relatively low temperature of 400-600 DEG C, and the impurity-free sodium ferrite-lanthanum ferrite heterostructure nano electrode material is generated by regulating and controlling the input of the molar ratio of lanthanum to iron.

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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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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