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Rare earth-doped cyano-based material, preparation method and application, and sodium-ion battery

A sodium-ion battery, rare earth doping technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lower battery energy density, poor material processing performance, and unstable structure, and achieve improved conductivity and low cost , the effect of easy operation

Active Publication Date: 2021-06-25
吕宜媛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of compound has the disadvantages of poor conductivity, unstable structure, and low tap density. When making batteries, more conductive agents need to be added to reduce the energy density of the battery. At the same time, the processing performance of the material will be relatively poor.

Method used

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  • Rare earth-doped cyano-based material, preparation method and application, and sodium-ion battery
  • Rare earth-doped cyano-based material, preparation method and application, and sodium-ion battery
  • Rare earth-doped cyano-based material, preparation method and application, and sodium-ion battery

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preparation example Construction

[0064] In a second aspect, in at least one embodiment, a method for preparing the above-mentioned rare earth-doped cyano-based material is provided, comprising the following steps:

[0065] (a) Sodium ferrocyanide, sodium salt and water are mixed to obtain solution A;

[0066] (b) soluble divalent manganese salt is mixed with water to obtain solution B;

[0067] (c) mixing a soluble salt containing a rare earth type doping element M with water to obtain a solution C;

[0068] (d) Add solution B and solution C gradually to solution A at the same time, and obtain rare earth-doped cyano-based materials after co-precipitation reaction.

[0069] The preparation method of the present invention can not only improve the lattice stability, corrosion resistance, electrical conductivity and density of the cyano-based material, thereby significantly promoting the improvement of the cycle stability and rate performance of the material, and prolonging the service life of the material. Mor...

Embodiment 1

[0098] A rare earth doped cyano-based material, the chemical formula of the cyano-based material is Na x mn 1-y La y [Fe(CN) 6 ], where, 0<x≤2, 0<y≤0.2; the cyano-based material has a rhombohedral crystal structure.

[0099] The preparation method of the doped cyano-based material comprises the following steps:

[0100] Dissolve sodium ferrocyanide and sodium chloride in deionized water, and stir evenly to obtain solution A. The concentration of ferrocyanide ions in the solution is 0.1mol / L, and the molar weight of sodium chloride is 80% of that of sodium ferrocyanide. times;

[0101] Dissolve manganese sulfate in deionized water to obtain Mn 2+ Solution B with a concentration of 0.2mol / L, the volume ratio of solution B to solution A is 1:1;

[0102] Dissolve lanthanum sulfate in deionized water to obtain 3+ Solution C with a concentration of 0.015mol / L, the volume ratio of solution C to solution B is 1:1;

[0103] Then, under constant stirring, add solution C and solu...

Embodiment 2

[0122] A rare earth doped cyano-based material, the chemical formula of the cyano-based material is Na x mn 1-y Ce y [Fe(CN) 6 ], where, 0<x≤2, 0<y≤0.2; the cyano-based material has a rhombohedral crystal structure.

[0123] The preparation method of the doped cyano-based material comprises the following steps:

[0124] Dissolve sodium ferrocyanide and sodium chloride in deionized water, stir well to obtain solution A, the concentration of ferrocyanide ions in the solution is 0.2mol / L, and the molar weight of sodium chloride is 90% of that of sodium ferrocyanide. times;

[0125] Dissolve manganous chloride in deionized water to obtain 2+ Solution B with a concentration of 0.4mol / L, the volume ratio of solution B to solution A is 1:1;

[0126] Dissolve cerium chloride in deionized water to obtain Ce 3+ Solution C with a concentration of 0.05mol / L, the volume ratio of solution C to solution B is 1:1;

[0127] Then, under constant stirring, add solution C and solution B t...

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Abstract

The invention belongs to the technical field of new energy storage batteries, and relates to a rare earth-doped cyano-based material, a preparation method and application, and a sodium ion battery. The chemical formula of the rare earth doped cyano-based material of the present invention is Na x mn 1‑y m y [Fe(CN) 6 ], where, 0

Description

technical field [0001] The invention belongs to the technical field of new energy storage batteries, and in particular relates to a rare earth-doped cyano-based material, a preparation method and application thereof, and a sodium ion battery. Background technique [0002] With the continuous development of clean energy such as solar energy, wind energy, and ocean energy, the demand for high-efficiency energy storage batteries is increasing. In addition, large-scale battery energy storage can play a role in "shaving peaks and filling valleys" for electricity, improving the efficiency of electricity use. Although lead-acid batteries are cheap, they have low energy density, short life, and pollution problems. Although the technology of lithium-ion batteries is relatively mature and the energy density is high, its cost is high and limited by lithium resources, it cannot meet the requirements of large-scale energy storage. In contrast, sodium resources are abundant in the earth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054C01C3/12
CPCC01C3/12H01M4/58H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 吕宜媛陈琴雅
Owner 吕宜媛
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