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A kind of preparation method of sodium cobalt pyrophosphate and its application in sodium ion battery

A technology of sodium cobalt pyrophosphate and hydrated cobalt pyrophosphate, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that it is difficult to control the morphology and crystal phase of sodium cobalt pyrophosphate products, and it is difficult to obtain stable performance and high rate performance. Poor and other problems, to achieve the effect of excellent electrochemical performance, excellent electrochemical performance, uniform particle size

Active Publication Date: 2019-07-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with sodium iron pyrophosphate (discharge platform 3V), it has a higher discharge voltage of 0.5V. As a cathode material for sodium ion batteries, it can effectively improve the energy density and power density of sodium ion batteries, and overcome the relatively positive redox of sodium ions. Potential and large atomic mass lead to low voltage of the positive electrode material of sodium ion battery and poor performance of large rate
At present, the solid-phase ball milling method can realize large-scale industrial production and the preparation process is simple and easy, and the process is mature. However, this method is difficult to control the morphology and crystal phase of the sodium cobalt pyrophosphate product, and it is difficult to obtain stable performance and electrochemical activity. Higher Sodium Cobalt Pyrophosphate Material

Method used

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  • A kind of preparation method of sodium cobalt pyrophosphate and its application in sodium ion battery
  • A kind of preparation method of sodium cobalt pyrophosphate and its application in sodium ion battery
  • A kind of preparation method of sodium cobalt pyrophosphate and its application in sodium ion battery

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Embodiment 1

[0037] (1) The present embodiment is designed to generate 0.03mol target product sodium cobalt pyrophosphate, and cobalt chloride hexahydrate and potassium pyrophosphate are respectively prepared into a solution with a concentration of 0.5mol / L. Under stirring conditions, 60mL cobalt chloride solution is slowly Add 60 mL of potassium pyrophosphate solution, adjust the pH of the mixed solution to 3.5 with hydrochloric acid solution with a concentration of 1 mol / L, age at room temperature for 3 days, filter and dry to obtain cobalt pyrophosphate hexahydrate;

[0038](2) 0.0315mol sodium carbonate and the cobalt pyrophosphate hexahydrate obtained in the above steps are uniformly mixed by solid-phase ball milling to obtain the sodium cobalt pyrophosphate precursor;

[0039] (3) The precursor is placed in an argon atmosphere, heated to 650°C at a rate of 5°C / min for sintering for 3 hours, then cooled to 550°C for 1 hour at a rate of 2°C / min, and then sintered at 2°C / min The tempera...

Embodiment 2

[0045] This embodiment includes the following steps:

[0046] (1) This embodiment is designed to generate 0.03 mol of the target product sodium cobalt pyrophosphate, cobalt chloride hexahydrate and potassium pyrophosphate are respectively prepared into a solution with a concentration of 1 mol / L, and 30 mL of cobalt chloride solution is slowly added under stirring conditions 30mL of potassium pyrophosphate solution, the obtained mixed solution was adjusted to pH 3 with hydrochloric acid solution with a concentration of 1mol / L, aged at room temperature for 4 days, filtered and dried to obtain cobalt pyrophosphate hexahydrate;

[0047] (2) 0.0315mol sodium carbonate and the cobalt pyrophosphate hexahydrate obtained in the above steps are uniformly mixed by solid-phase ball milling to obtain the sodium cobalt pyrophosphate precursor;

[0048] (3) The precursor is placed in an argon atmosphere, heated to 620°C for 3 hours at a rate of 7°C / min for sintering, then cooled to 550°C for...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] (1) The present embodiment is designed to generate 0.03mol target product sodium cobalt pyrophosphate, and cobalt chloride hexahydrate and potassium pyrophosphate are respectively prepared into a solution with a concentration of 0.5mol / L. Under stirring conditions, 60mL cobalt chloride solution is slowly Add 60 mL of potassium pyrophosphate solution, adjust the pH of the mixed solution to 3.5 with hydrochloric acid solution with a concentration of 1 mol / L, age at room temperature for 3 days, filter and dry to obtain cobalt pyrophosphate hexahydrate;

[0053] (2) 0.03mol sodium carbonate and the cobalt pyrophosphate hexahydrate obtained in the above steps are uniformly mixed by solid-phase ball milling to obtain the sodium cobalt pyrophosphate precursor;

[0054] (3) The precursor is placed in an argon atmosphere, heated to 680°C at a rate of 5°C / min for sintering for 3 hours, then cooled to 550°C for 1 hour at a rat...

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Abstract

The invention discloses a preparation method of sodium cobalt pyrophosphate and application of the sodium cobalt pyrophosphate to a sodium ion battery. The preparation method of the sodium cobalt pyrophosphate comprises the following steps: reacting a cobalt source solution with a potassium pyrophosphate solution to obtain cobalt pyrophosphate hexahydrate; mixing a sodium source and the cobalt pyrophosphate hexahydrate uniformly, putting the mixture under protective atmosphere, sintering and cooling to room temperature to obtain the sodium cobalt pyrophosphate with uniform grain size and shape, large specific surface area, single crystalline phase and high electrochemical activity. The sodium cobalt pyrophosphate serving as a sodium ion positive electrode material can show higher electrochemical property and has an exceeded 3.5V discharging platform; furthermore, the preparation method of the sodium cobalt pyrophosphate is simple and practicable in process and is convenient in large-scale production.

Description

technical field [0001] The invention relates to a preparation method of cobalt sodium pyrophosphate, in particular to a preparation method of a triclinic cobalt sodium pyrophosphate material and the application of cobalt sodium pyrophosphate as a positive electrode material of a sodium ion battery; belonging to the field of sodium ion batteries . Background technique [0002] Since the commercial production of lithium-ion batteries, lithium-ion batteries have been widely used in various fields, and have an absolute advantage in the field of mobile energy storage. However, due to the shortage of lithium metal resources in the world, large-scale energy storage fields such as electric vehicles and energy storage power stations require a large amount of raw materials, and the manufacturing cost of lithium-ion batteries is on the rise. In the field of energy storage, there is an urgent need for secondary batteries with excellent performance and low price to replace the current e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M10/054
CPCH01M4/525H01M10/054Y02E60/10
Inventor 张治安赖延清陈晓彬杜柯尚国志李煌旭肖志伟
Owner CENT SOUTH UNIV
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