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Preparation method of nickel-aluminum coated nickel-iron-manganese sodium ion precursor material

A precursor, sodium ion technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problem of unstable internal structure of sodium ion battery materials, achieve high stability and safety, improve energy, improve The effect of ionic conductivity

Active Publication Date: 2022-04-08
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of internal structure modification can only solve the problem of unstable internal structure of sodium-ion battery materials, and cannot solve the problem that sodium ions are sensitive to water and easily react with electrolytes.

Method used

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  • Preparation method of nickel-aluminum coated nickel-iron-manganese sodium ion precursor material
  • Preparation method of nickel-aluminum coated nickel-iron-manganese sodium ion precursor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, the nickel sulfate solution, the ferrous sulfate solution and the manganese sulfate solution are configured according to the molar ratio of 0.25:0.5:0.25 as the nickel-iron-manganese metal salt A solution with a concentration of 2mol / L, and the ammonia water complexation of 1mol / L is configured agent solution and 1mol / L sodium hydroxide solution.

[0022] Step 2. Add solution A, ammonia water complexing agent and sodium hydroxide solution into a 1000L reaction kettle at a certain feed rate, react at 40°C for 50h, control the reaction pH of the system to 9.5-10, and the ammonia concentration to 3 -5g / L. A precursor with good sphericity, uniform primary particles and dense packing is obtained: Ni 0.25 Fe 0.5 mn 0.25 (OH) 2 , the average particle size of the precursor is 3 μm. The flow of the solution A is 30L / h, the flow of ammonia water is 3L / h, the flow of the sodium hydroxide solution is 8L / h, and the stirring speed is 280-350r / min.

[0023] Step 3, the p...

Embodiment 2

[0028] Step 1, the nickel sulfate solution, the ferrous sulfate solution and the manganese sulfate solution are configured according to the molar ratio of 0.34:0.33:0.33 as the nickel-iron-manganese metal salt A solution with a concentration of 2mol / L, and the ammonia water complexation of 2mol / L agent solution and 2mol / L sodium carbonate solution.

[0029] Step 2. Add solution A, ammonia complexing agent and sodium carbonate solution into a 1000L reactor at a certain feed rate, react at 50°C for 60h, control the reaction pH of the system to 9-9.5, and the ammonia concentration to 4- 6g / L. A precursor with good sphericity, coarse primary particles and dense packing is obtained: Ni 0.34 Fe 0.33 mn 0.33 (OH) 2 , the average particle size of the precursor is 5 μm. The flow rate of the solution A is 40L / h, the flow rate of ammonia water is 4L / h, the flow rate of liquid caustic soda is 10L / h, and the stirring speed is 260-320r / min.

[0030]Step 3, the preparation concentratio...

Embodiment 3

[0033] Step 1, nickel sulfate solution, ferrous sulfate solution and manganese sulfate solution are configured according to the ratio of molar ratio of 0.6:0.2:0.2 to be the nickel-iron-manganese metal salt A solution with a concentration of 3mol / L, and configure 3mol / L ammonia water complexation agent solution and 3mol / L potassium hydroxide solution.

[0034] Step 2. Add solution A, ammonia water complexing agent and potassium hydroxide solution into a 1000L reaction kettle at a certain feed rate, react at 70°C for 80h, control the reaction pH of the system to 9.8-10, and the ammonia concentration to 6 -8g / L. A precursor with better sphericity, more uniform primary particles and dense packing is obtained: Ni 0.6 Fe 0.2 mn 0.2 (OH) 2 , the average particle size of the precursor is 10 μm. The flow rate of the solution A is 50L / h, the flow rate of the ammonia water is 6L / h, the flow rate of the potassium hydroxide solution is 15L / h, and the stirring speed is 230-250r / min. ...

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Abstract

The invention discloses a preparation method of a nickel-aluminum coated nickel-iron-manganese sodium ion precursor material. The preparation method comprises the following steps: preparing a Ni < x > < 1 > Fe < y > < 1 > Mn < 1-x-y > 1 (OH) < 2 > precursor; preparing a Ni < x > < 2 > Fe < y > < 2 > Mn < z > < 2 > Al < 1-x-y-z > 2 (OH) < 2 > iron-based precursor of which the outer layer is coated with nickel aluminum hydroxide; and uniformly mixing the nickel-iron-manganese-aluminum precursor coated with nickel and aluminum on the outer layer with sodium carbonate in a mortar, and calcining. According to the invention, the surface of the nickel-iron-manganese hydroxide is coated with a layer of nickel-aluminum hydroxide at the precursor end, so that the aluminum element on the surface of the finally formed sodion precursor material is uniformly distributed, and the reaction between the positive electrode material and an electrolyte in the charging and discharging process is reduced; meanwhile, the nickel on the surface can also improve the energy of the sodium ion battery, and the nickel compound can also improve the ionic conductivity of the material and increase the rate capability. The sodium battery positive electrode material prepared by the method disclosed by the invention is of a sphere-like structure and has higher stability and safety.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a method for preparing a nickel-iron-manganese-sodium ion precursor material coated with nickel and aluminum. Background technique [0002] In recent years, the new energy automobile industry has developed rapidly. Its power battery materials are mainly lithium batteries, including two technical routes of lithium iron phosphate and ternary power batteries. The former has excellent safety performance and low cost, while the latter has high energy density and relatively long battery life. Strong, suitable for high-end models. However, due to the limited reserves of lithium resources and the high price and cost, the cost of power batteries has gradually increased. Compared with lithium-ion batteries, sodium-ion batteries are low in cost, rich in Na resources and easy to obtain, making them play the role of substitutes in the new energy industry. It is expected to take the lead ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/485H01M10/054
CPCY02E60/10
Inventor 许开华张坤薛晓斐李聪杨幸范亮姣李雪倩
Owner JINGMEN GEM NEW MATERIAL
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