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Preparation method and application of sodium manganate

A technology of sodium manganate and sodium manganate, applied in the direction of manganate/permanganate, structural parts, electrical components, etc., can solve the problems of fast capacity fading, poor speed capability, etc., and achieve low cost and good economy Benefits, beneficial to the effect of industrial application

Active Publication Date: 2022-03-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, currently reported Na x MnO 2 Since it is not affected by Na + Diffusion pathways and complex phase transition processes exhibit poor rate capability and fast capacity fading, requiring further optimization

Method used

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  • Preparation method and application of sodium manganate
  • Preparation method and application of sodium manganate
  • Preparation method and application of sodium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 0.01 mol of manganese acetate into 40 mL of deionized water, heat and stir at 80°C for 1 h. Then add 0.01 mol of sodium citrate dihydrate, stir at 80° C. for 2 h, and stir at a speed of 300 rpm. Afterwards, the temperature was raised to 100° C., the stirring speed was 500 rpm, and the solution was stirred until the solution became a gel. Then move into the oven and dry at 120°C. Grind the dried precursor evenly. Then use a muffle furnace for heat treatment, and use a segmented heating method to process the sample. First heat to 350°C and keep warm for 4 hours, then heat to 950°C and keep warm for 24h. Sodium manganate product is obtained.

[0046] by attaching figure 1 It can be seen from the scanning electron microscope (SEM, 10 μm) that the prepared sodium manganate is a single crystal crystal, and the grain size is 5-30 μm; figure 2 It can be seen from the scanning electron microscope image (SEM, 1 μm) that the prepared sodium manganate has a layered struc...

Embodiment 2

[0049] Add 0.1 mol of manganese acetate into 100 mL of deionized water, heat and stir at 80°C for 1 h. Then 0.12 mol of sodium citrate dihydrate was added, stirred at 80° C. for 2 h, and the stirring speed was 500 rpm. Afterwards, the temperature was raised to 100° C., the stirring speed was 500 rpm, and the solution was stirred until the solution became a gel. Then move into the oven and dry at 150°C. Grind the dried precursor evenly. Then use a muffle furnace for heat treatment, and use a segmented heating method to process the sample. First heat to 350°C and keep warm for 4 hours, then heat to 800°C and keep warm for 24h. Sodium manganate product is obtained. The SEM, XRD and electrical performance tests of the product prepared in Example 2 are all similar to the sample prepared in Example 1.

Embodiment 3

[0051] Add 0.1 mol of manganese sulfate to 100 mL of deionized water, heat and stir at 90°C for 1 h. Then add 0.12 mol of sodium citrate dihydrate, stir at 90° C. for 2 h, and stir at a speed of 500 rpm. Afterwards, the temperature was raised to 100° C., the stirring speed was 500 rpm, and the solution was stirred until the solution became a gel. Then move into the oven and dry at 120°C. Grind the dried precursor evenly. Then use an argon atmosphere for heat treatment, and use a segmented heating method to process the sample. First heat to 400°C and keep warm for 4 hours, then heat to 850°C and keep warm for 12h. Sodium manganate product is obtained.

[0052] The SEM, XRD and electrical performance tests of the product prepared in Example 3 are all similar to the sample prepared in Example 1.

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Abstract

The invention discloses a preparation method of sodium manganate, which at least comprises the following steps: a) heating and complexing an aqueous solution containing a manganese source and sodium citrate to obtain gel; b) drying the gel to obtain a precursor; and c) grinding the precursor, and calcining to obtain the sodium manganate. The sodium manganate is simple in preparation process, simple in raw material composition and suitable for mass production. Meanwhile, when the sodium manganate material is applied to the positive electrode of the sodium ion battery, excellent long cycle performance and rate capability can be shown.

Description

technical field [0001] The invention relates to a preparation method and application of sodium manganate, belonging to the field of sodium ion batteries. Background technique [0002] In recent years, energy storage devices represented by lithium-ion batteries have been widely researched and applied to various electronic devices. The demand for lithium resources is increasing day by day, resulting in a significant increase in the cost of lithium batteries. Sodium is abundant and widely distributed, and its natural abundance is more than 1000 times greater than that of lithium, so sodium-ion batteries (SIBs) are considered as a cost-effective alternative to lithium-ion batteries. [0003] However, the energy density of sodium-ion batteries has been relatively low so far. However, the electrochemical energy density of Na-ion batteries depends largely on the intrinsic chemical properties of the cathode materials. In order to increase the energy density of the battery, obtaini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/054
CPCC01G45/12H01M4/505H01M10/054C01P2002/60C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 吴忠帅温鹏超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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