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Potassium manganate potassium ion battery positive electrode material

A battery positive electrode, potassium ion technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as inability to meet energy demand, and achieve the effects of low preparation cost, easy operation, and pure material phase

Active Publication Date: 2020-08-28
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, lithium-ion batteries have been successfully commercialized and occupy half of the new energy market, but limited lithium resources make it impossible to meet the growing energy demand in the future

Method used

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  • Potassium manganate potassium ion battery positive electrode material
  • Potassium manganate potassium ion battery positive electrode material
  • Potassium manganate potassium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 0.025 mol of manganese chloride tetrahydrate powder and 0.025 mol of sodium carbonate powder in two beakers and add 25 mL of deionized water to each, and continue to stir until they are completely dissolved. The manganese chloride tetrahydrate was added dropwise to the sodium carbonate solution under a stirring speed of 200 r / min, and stirring was continued for 5 minutes after the addition, and then the precipitate was filtered, washed and dried, and placed in the air at 600 rpm. Annealed at ℃ for 4 h to obtain the precursor Mn 2 O 3 Microspheres. 0.004mol precursor Mn 2 O 3 The microspheres were dispersed in a KOH solution with a concentration of 4 M and reacted hydrothermally at 200 ℃ for 12 hours. The precipitate was directly dried and then placed in an air atmosphere at 700 ℃ and annealed for 3 hours to obtain K. x MnO 2 Cathode material for potassium ion battery. In order to understand the morphology of the sample, 2 O 3 And K x MnO 2 The samples were tested by ...

Embodiment 2

[0018] Put 0.025 mol of manganese chloride tetrahydrate powder and 0.025 mol of sodium carbonate powder in two beakers and add 25 mL of deionized water to each, and continue to stir until they are completely dissolved. The manganese chloride tetrahydrate was added dropwise to the sodium carbonate solution under a stirring speed of 200 r / min, and stirring was continued for 5 minutes after the addition, and then the precipitate was filtered, washed and dried, and placed in the air at 600 rpm. Annealed at ℃ for 2 h to obtain the precursor Mn 2 O 3 Microspheres. 0.004mol precursor Mn 2 O 3 The microspheres were dispersed in a KOH solution with a concentration of 2 M and reacted hydrothermally at 200 ℃ for 12 h. The precipitate was directly dried and then placed in an air atmosphere at 700 ℃ for annealing treatment for 3 h to obtain K x MnO 2 Cathode material for potassium ion battery. Such as figure 2 As shown in b, for the samples obtained after 2M KOH treatment, there are K at 1...

Embodiment 3

[0020] Put 0.025 mol of manganese chloride tetrahydrate powder and 0.025 mol of sodium carbonate powder in two beakers and add 25 mL of deionized water to each, and continue to stir until they are completely dissolved. The manganese chloride tetrahydrate was added dropwise to the sodium carbonate solution under a stirring speed of 200 r / min, and stirring was continued for 5 minutes after the addition, and then the precipitate was filtered, washed and dried, and placed in the air at 600 rpm. Annealed at ℃ for 6 h to obtain the precursor Mn 2 O 3 Microspheres. 0.004mol precursor Mn 2 O 3 The microspheres were dispersed in a KOH solution with a concentration of 6 M and reacted hydrothermally at 200°C for 12 hours. The precipitate was directly dried and then placed in an air atmosphere at 700°C and annealed for 3 hours to obtain K. x MnO 2 Cathode material for potassium ion battery. For the samples obtained after 6M KOH treatment, there are K at 12.54°, 25.24°, 35.36°, 36.21°, 39.6...

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Abstract

The invention provides a preparation method of KxMnO2. The size of the prepared KxMnO2 block is 0.5-4 [mu] m. According to the KxMnO2, manganese chloride tetrahydrate, sodium carbonate and potassium hydroxide are used as a manganese source and a potassium source, and the KxMnO2 powder is prepared through coprecipitation, hydrothermal reaction and subsequent calcination processes. Test results showthat the KXMnO2 prepared by treating the precursor with potassium hydroxide with the concentration of 4M has the best electrochemical performance. The potassium ion half-battery assembled by taking the KxMnO2 as the positive electrode material of the potassium ion battery is relatively good in electrochemical performance and has potential application value in the field of potassium ion batteries.

Description

Technical field [0001] The invention relates to a powdered K x MnO 2 A method for preparing a positive electrode material for a potassium ion battery belongs to the field of positive electrode materials for a potassium ion battery. Background technique [0002] With the acceleration of the development of consumer electronics, power transportation and smart grids, the demand for environmentally friendly and sustainable energy storage equipment is increasing. At this stage, lithium-ion batteries have successfully achieved commercialization, occupying half of the new energy market, but limited lithium resources make it unable to meet the growing energy demand in the future. Compared with lithium resources, potassium is abundantly stored on the earth and low in cost, so it is in the current latest storage technology. Potassium ion batteries have the most potential to replace lithium ion batteries. At the same time, K (-2.714 V vs NHE) has a lower oxygen reduction potential. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/054
CPCC01G45/1228H01M4/505H01M10/054H01M2004/021H01M2004/028C01P2004/03C01P2002/72C01P2004/61C01P2004/62C01P2006/40Y02E60/10
Inventor 高林王祖静陈思杨学林
Owner CHINA THREE GORGES UNIV
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