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Sodium ion battery positive electrode material, and preparation method and application method thereof

A technology for sodium ion batteries and cathode materials, applied in the field of electrochemistry, can solve the problems of poor reproducibility of precursor composition control, uncontrollable product structure and morphology, etc., and achieve the effect of structure optimization

Active Publication Date: 2016-06-22
浙江瓦司特钠科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to provide a positive electrode material for a sodium ion battery and a preparation method thereof, aiming to solve the problems in the prior art such as poor control of precursor composition and uncontrollable product structure and morphology.

Method used

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  • Sodium ion battery positive electrode material, and preparation method and application method thereof
  • Sodium ion battery positive electrode material, and preparation method and application method thereof
  • Sodium ion battery positive electrode material, and preparation method and application method thereof

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Embodiment 1

[0034] 1) The reactants and solvents are all commercial reagents, and 28.52g of aqueous nickel chloride (NiCl 2 ·6H 2O) and 15.83g of aqueous manganese chloride (MnCl 2 4H 2 O) Transfer to 100mL deionized water to prepare an aqueous solution with a total cation concentration of 2mol / L and heat it to 60-80°C, and adjust the pH value of the aqueous solution to 7 with an appropriate amount of ammonia water; prepare 400mL of ammonium oxalate solution with a concentration of 0.5mol / L, Add 2.52 g of oxalic acid to the ammonium oxalate solution; after the preparation is completed, slowly add the above-mentioned ammonium oxalate solution dropwise to the heated and stirred mixed salt solution, and quickly add the ammonium oxalate solution when it becomes turbid, and filter to obtain the precipitate;

[0035] 2) Mix the precipitate with 13.40g of sodium oxalate and transfer it to a hydrothermal reaction device. The hydrothermal solvent is 70g of a mixture of ethanol and water with a m...

Embodiment 2

[0042] 1) Both reactants and solvents use commercial reagents, 26.28g of nickel sulfate hexahydrate and 15.1g of manganese sulfate (MnSO 4 ) was transferred to 200mL deionized water to prepare an aqueous solution with a total cation concentration of 1mol / L and heated to 60°C, and adjusted the pH of the aqueous solution to 6 with an appropriate amount of ammonia water; prepared 200mL of ammonium oxalate solution with a concentration of 1mol / L, and added An additional 5.04 g of oxalic acid was added to the solution; after the preparation was completed, slowly add the above-mentioned ammonium oxalate solution dropwise to the mixed salt solution under heating and stirring, and quickly add the ammonium oxalate solution when turbidity appeared, and filter to obtain the precipitate;

[0043] 2) Mix the precipitate with 8.0g of sodium hydroxide and transfer it to a hydrothermal reaction device. The hydrothermal solvent is 40g of a mixture of ethanol and water with a mass ratio of 1:1. ...

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Abstract

The invention discloses a sodium ion battery positive electrode material, and a preparation method and application method thereof, belonging to the field of electrochemistry. The component of the material is laminar sodium manganate nickelate of which the chemical general formula is NaxNi[0.5+y]Mn[0.5-y]O2, wherein x is 0.9-1.1, and y is 0-0.2. The preparation method comprises the following steps: precipitating a soluble manganese compound-nickel compound mixed solution through oxalates, carrying out hydrothermal reaction in a water-ethanol mixed solution, and finally, carrying out heat treatment to obtain the laminar sodium manganate nickelate product. The invention solves the problems of poor precursor composition control reproducibility, controllable product structure and shape and the like in the prior art. Since the precursor structure is uniform and the stoichiometric proportion is accurate, the structure is further optimized after the ethanol / hydrothermal treatment, thereby finally obtaining the material prepared by the obviously better traditional method.

Description

technical field [0001] The invention relates to a positive electrode material of a sodium ion battery, a preparation method and a use method thereof, and belongs to the field of electrochemistry. Background technique [0002] The current lithium-ion secondary battery has the advantages of high energy density, long cycle life, and small self-discharge. Applications are power batteries for mobile equipment (electric vehicles, submarines, etc.). However, lithium is a precious metal, and its content is scarce, which has become a worry for large-scale applications in the future. [0003] In contrast, the sodium element of the same main group as lithium is very abundant, with an abundance of about 2.64% in the earth's crust, and there is also a large amount of sodium in seawater. This determines that replacing lithium with sodium and developing sodium-ion secondary batteries has broad prospects from the perspective of resources. The electrochemical performance of ion batteries ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/054
CPCC01G53/006C01P2002/72C01P2004/03H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 徐守冬陈良赵翰庆刘冬冬张鼎刘世斌段东红
Owner 浙江瓦司特钠科技有限公司
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