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Synthetic method of sodium ferric sulfate cathode material

A cathode material, sodium ferric sulfate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as complex synthesis process, and achieve the effects of simple operation, improved reaction efficiency, and excellent electrochemical performance

Active Publication Date: 2021-08-24
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

current to Na 2+2x Fe 2-x (SO 4 ) 3 Most of the synthesis methods of materials adopt low-temperature solid-phase method, and the raw material FeSO 4 ·7H 2 Dehydration of O to prepare anhydrous FeSO 4 After mixing Na 2 SO 4 , the synthesis process is quite complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The synthetic method of sodium ferric sulfate cathode material, comprises the following steps:

[0023] Step 1: Na 2 SO 4 and FeSO 4 ·7H 2 O is weighed and mixed according to the molar ratio of 1:1.4, and the graphene carbon source is added. powder;

[0024] Step 2: After calcining the uniform powder after ball milling in Step 1 in an inert atmosphere of high-purity argon at 320-330°C for 20 hours, the product is cooled to room temperature with the furnace, and then manually ground for 3 minutes until no large particles are seen with the naked eye. final material.

Embodiment 2

[0026] The synthetic method of sodium ferric sulfate cathode material, comprises the following steps:

[0027] Step 1: Na 2 SO 4 and FeSO 4 ·7H 2 O is weighed and mixed according to the molar ratio of 1:2.0, and the carbon black Super P carbon source is added, whose mass is 1%wt of the mass of the mixture. After 25 minutes, a highly dispersed uniform powder is obtained;

[0028] Step 2: After calcining the uniform powder after ball milling in Step 1 in an inert atmosphere of high-purity argon at 350-360°C for 30 hours, the product is cooled to room temperature with the furnace, and then manually ground for 5 minutes until no large particles are visible to the naked eye. final material.

Embodiment 3

[0030] The synthetic method of sodium ferric sulfate cathode material, comprises the following steps:

[0031] Step 1: Na 2 SO 4 and FeSO 4 ·7H 2 O After weighing and mixing according to the molar ratio of 1:2, add graphene carbon source, the mass of which is 1.5%wt of the mass of the mixture, after mixing evenly, ethanol is used as a grinding aid, wet high-energy ball milling several times, used for high-energy ball milling The diameter of the steel ball is 4mm, the mass ratio of the steel ball to the raw material is 7:2, and the ball milling rate is 500rad / min, each 20min, to obtain highly dispersed uniform powder;

[0032] Step 2: Heat the uniform powder after ball milling in Step 1 to 380°C at a slow heating rate of 3.5°C / min, then calcinate at this temperature and in an inert atmosphere of high-purity argon for 10 hours, and then cool the product to At room temperature, grind manually for another 10 minutes until no large particles are seen with the naked eye, which i...

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Abstract

The synthetic method of sodium ferric sulfate cathode material, comprises the following steps: (1) with Na 2 SO 4 and FeSO 4 ·7H 2 After O is weighed and mixed according to the molar ratio of 1: (1.4-2.0), a carbon source is added to the mixture. The carbon source mass is 0.75-1.5%wt of the mixture mass. 20-30 minutes to obtain a highly dispersed uniform powder; (2) After the ball-milled uniform powder is calcined in an inert atmosphere of high-purity argon at 320-380 °C for 10-30 hours, the product is cooled to room temperature with the furnace, and then manually ground for 3 ~10min, until no large particles can be seen with the naked eye, it is the final material. The synthesis method of the invention is simple, the operation flow is short, and the product performance is excellent.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials for lithium ion batteries, in particular to a 2 SO 4 and FeSO 4 ·7H 2 O as the main material to synthesize Na 2+2x Fe 2-x (SO 4 ) 3 material method. Background technique [0002] The environmental and energy crisis is becoming more and more severe, and the development of low-cost and environmentally friendly new energy sources and energy storage and conversion have attracted the attention of governments and scientific and technological researchers from various countries. The rapid rise of lithium-ion secondary batteries, the research of its cathode materials mainly focus on the layered oxide LiMO 2 (M=Co, Mn, Ni), polyanionic LiFePO 4 , high voltage Li[Ni 0.5 mn 1.5 ]O 4 and lithium-rich material xLi 2 MnO 3 ·(1-x)LiMO 2 Wait. Among many lithium ion cathode materials, lithium iron phosphate LiFePO 4 and ternary layered material LiNi x co y mn z o 2 be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 吴振国刘玉妹郭孝东向伟钟本和
Owner 浙江钠创新能源有限公司
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