Ferrocyanogen positive material, preparation method and application thereof

A positive electrode material, ferrocyanide-based technology, applied in ferricyanide, battery electrodes, metal cyanide, etc., can solve problems such as unsatisfactory cycle stability, poor crystallinity of ferrocyanide, and low capacity of sodium-ion batteries. Achieve the effect of good crystallinity, short cycle time and simple process

Active Publication Date: 2017-11-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But also because of this, the prepared ferrocyanide generally has poor crystallinity, which leads to the low

Method used

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  • Ferrocyanogen positive material, preparation method and application thereof
  • Ferrocyanogen positive material, preparation method and application thereof

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Experimental program
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Embodiment 1

[0034] Sodium ferrocyanide is dissolved in deionized water, and stirred evenly to obtain solution A whose concentration is 0.1mol / L in terms of ferrocyanide ion; manganous chloride is dissolved in deionized water, and stirred evenly to obtain 2+ Solution B whose meter concentration is 0.2mol / L, wherein the molar weight of manganous chloride is 2.5 times of sodium ferrocyanide, then sodium hydroxide is added in the solution B and stirred (sodium hydroxide and manganous chloride The molar ratio is 2.5:1), to get Mn(OH) 2 Suspension C: Mix solution A and suspension C, add acetic acid, the molar amount of acetic acid is 5 times that of manganese chloride, undergo a hydrothermal reaction at 90°C for 8 hours, then cool, wash and dry to obtain a ferrocyanide positive electrode Material. Through ICP analysis, the x value of the product is 1.7, the y value is 0.8, the lattice structure is rhombohedral phase, and the particle size is 200-400 nm.

[0035] figure 1 For the X-ray diffra...

Embodiment 2

[0047] Dissolve sodium ferrocyanide in deionized water and stir evenly to obtain solution A with a concentration of 0.2 mol / L in terms of ferrocyanide ion; dissolve manganous sulfate and ferrous chloride with a molar ratio of 1:1 in In deionized water, stir evenly to obtain Mn 2+ and Fe 2+ A total concentration of 0.4mol / L solution B (wherein the total molar weight of manganese sulfate and ferrous chloride is 3 times that of sodium ferrocyanide), then sodium hydroxide is added to solution B and stirred (hydroxide The total molar ratio of sodium to manganous sulfate and ferrous chloride is 3:1), to obtain Mn 0.5 Fe 0.5 (OH) 2 Suspension C: Mix solution A and suspension C, add tartaric acid, the molar amount of tartaric acid is 4 times that of manganese chloride, undergo hydrothermal reaction at 80°C for 10 hours, then cool, wash and dry to obtain a ferrocyanide positive electrode material, the chemical formula is Na x M[Fe(CN) 6 ] y , where, x=1.65, y=0.75; the lattice s...

Embodiment 3

[0050] Sodium ferrocyanide is dissolved in deionized water, and stirred evenly to obtain solution A whose concentration is 0.3mol / L in terms of ferrocyanide ion; ferrous chloride is dissolved in deionized water, stirred evenly to obtain 2+ The solution B whose meter concentration is 0.65mol / L, wherein the molar weight of ferrous chloride is 2.5 times of sodium ferrocyanide, then sodium hydroxide is added in the solution B and stirred (sodium hydroxide and ferrous chloride The molar ratio is 2.5:1), to get Fe(OH) 2 Suspension C: Mix solution A and suspension C, add propionic acid, the molar weight of propionic acid is 3 times that of ferrous chloride, undergo hydrothermal reaction at 90°C for 10 hours, then cool, wash and dry to obtain ferrocyanide Based cathode material, the chemical formula is Na x M[Fe(CN) 6 ] y , where, x=1.62, y=0.76; the lattice structure is rhombohedral phase, and the particle size is 200-400nm.

[0051] The ferrocyanogen-based material prepared in t...

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Abstract

The invention discloses a preparation method of a ferrocyanogen positive material. The preparation method specifically comprises the following steps: mixing sodium ferrocyanide with deionized water to obtain a solution A; mixing a soluble salt of divalent transition metal ions M<2+> with deionized water to obtain a solution B, and then adding a precipitator to obtain an M(OH)2 suspension liquid; mixing the solution A and the M(OH)2 suspension liquid, then adding weak avid, and carrying out a hydrothermal reaction to obtain the ferrocyanogen positive material. According to the preparation method of the ferrocyanogen positive material disclosed by the invention, the method can regulate and control the morphology and crystal structure of the target product, the prepared ferrocyanogen positive material has good crystallinity, the material is applied into sodium-ion battery electrodes, and the electrochemical performance of sodium-ion batteries can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of novel energy storage batteries, in particular to a ferrocyanide positive electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, with the popularization of lithium-ion batteries, especially large-scale use in electric vehicles, the consumption of lithium resources is also huge. However, the reserves of lithium resources are limited, and there is currently no effective and economical technology for the recovery of lithium elements in waste lithium-ion batteries. In contrast, the reserves of sodium on the earth are much higher than that of lithium, and the price is much lower than that of lithium. Therefore, in recent years, sodium-ion batteries have attracted much attention. It is general...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054C01C3/12
CPCC01C3/12H01M4/58H01M10/054Y02E60/10
Inventor 谢健沈志龙孙云坡曹高劭赵新兵
Owner ZHEJIANG UNIV
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