Preparation method of manganese-based Prussian white positive electrode material and application of manganese-based Prussian white positive electrode material in sodium-ion battery electrode

A Prussian white and cathode material technology, applied in the field of new energy storage batteries, can solve the problems affecting the increase of the specific capacity of the reaction product, the slow dripping speed of the manganese salt solution, and the low specific capacity of the electrode material, so as to achieve low cost and improve electrochemical performance. performance, the effect of increasing sodium content

Active Publication Date: 2020-06-09
宇恒电池股份有限公司 +1
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AI Technical Summary

Benefits of technology

This patented technology allows for better quality MnCo2 powder with controlled particle sizes that are suitable for use in making high voltage lithium ion cells (LIB). These particles have excellent properties such as being able to absorb large amounts of liquid during charging or discharges without losing their effectiveness due to cracked porosity caused by excessive pressure on them when they come into contact with each other. Additionally, this new material contains fewer impurities than traditional methods like sintering it together instead of creating tiny grains through chemical reactions between different materials. Overall, these technical improvements make LIB more efficient at producing electric power while reducing costs associated therewith.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to efficiently reuse wasteful electrical battery cells without generating new ones or requiring expensive equipment such as lead acid batteries due to their unique properties like high voltages, longer lifetimes, good durability at lower temperatures compared with current methods.

Method used

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  • Preparation method of manganese-based Prussian white positive electrode material and application of manganese-based Prussian white positive electrode material in sodium-ion battery electrode
  • Preparation method of manganese-based Prussian white positive electrode material and application of manganese-based Prussian white positive electrode material in sodium-ion battery electrode

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[0026] This embodiment discloses a method for preparing a manganese-based Prussian white cathode material, which includes the following steps:

[0027] Step 1), dissolving the manganese salt containing divalent manganese ions in deionized water to form solution A; wherein the manganese salt is selected from one or more of manganese chloride, manganese sulfate, and manganese nitrate ;

[0028] Step 2), dissolving sodium ferrocyanide in deionized water to form solution B;

[0029] Step 3), drop solution A into solution B for co-precipitation reaction to obtain a suspension solution, the dropping rate of solution A is 5mL / min~40mL / min; preferably, the dropping rate of solution A is 10mL / min~30mL / min, and the Mn in solution A 2+ With [Fe(CN) in solution B 6 ] 2- The molar ratio is 1 to 2.1;

[0030] Step 4), move the suspension solution obtained in step 3) to the reaction kettle, and add soluble sodium salt, after a certain period of hydrothermal reaction, the hydrothermal r...

Embodiment 1

[0033] Step 1) manganese sulfate is dissolved in deionized water to obtain 2+ The concentration is 500mL of the solution of 0.3mol / L, and the solution A is obtained through thorough stirring;

[0034] Step 2) dissolving sodium ferrocyanide in deionized water, stirring evenly to obtain 500 mL of B solution whose concentration in terms of ferrocyanide ion is 0.2mol / L; 2+ with [Fe(CN) 6 ] 2- The molar ratio is 1.5;

[0035] Step 3) Then use a peristaltic pump to pump solution A into solution B at a rate of 10mL / min, during which solution B is kept in a state of rapid stirring;

[0036] Step 4) Move the reacted solution into a reaction kettle, add 0.15 mol NaCl, seal it, carry out hydrothermal reaction, keep warm at 80°C for 3 hours, and after hydrothermal reaction, cool, wash and dry to obtain manganese-based Prussian white.

[0037] figure 1 The scanning electron micrograph of the manganese-based Prussian white prepared in Example 1 shows that the particles obtained after t...

Embodiment 2

[0039] Step 1) manganese chloride is dissolved in deionized water to obtain 2+ The concentration is 500mL of the solution of 0.3mol / L, and the solution A is obtained through thorough stirring;

[0040] Step 2) dissolving sodium ferrocyanide in deionized water, stirring evenly to obtain 500 mL of B solution whose concentration in terms of ferrocyanide ion is 0.3mol / L; 2+ with [Fe(CN) 6 ] 2- The molar ratio of is 1;

[0041] Step 3) Then use a peristaltic pump to pump solution A into solution B at a rate of 20mL / min, during which solution B is kept in a state of rapid stirring;

[0042] Step 4) the solution after the reaction moves in the reactor, and adds 0.3molNa 2 SO 4 , after sealing, carry out hydrothermal reaction, heat preservation at 90°C for 5 hours, after hydrothermal reaction, after cooling, washing and drying, manganese-based Prussian white is obtained.

[0043]The Prussian white prepared in this example was used as the positive electrode material to make a pos...

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Abstract

The invention discloses a preparation method of a manganese-based Prussian white positive electrode material, which comprises the following steps: 1) dissolving a manganese salt containing divalent manganese ions in deionized water to form a solution A; 2) dissolving sodium ferrocyanide in deionized water to form a solution B; (3) dropwise adding the solution A into the solution B, and carrying out a co-precipitation reaction to obtain a suspension solution; and 4) transferring the suspension solution obtained in the step 3) into a reaction kettle, adding a soluble sodium salt, carrying out ahydrothermal reaction for a certain time, and carrying out suction filtration, drying and precipitation to obtain the manganese Prussian white positive electrode material. According to the preparationmethod disclosed by the invention, the morphology and size distribution of the product can be regulated and controlled, and the prepared manganese-based Prussian white has good crystallinity, is applied to electrodes of sodium ion batteries, and can significantly improve the electrochemical performance of the sodium ion batteries, especially can effectively improve the charge-discharge capacity.

Description

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Claims

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Application Information

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Owner 宇恒电池股份有限公司
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