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A kind of positive electrode material of spherical sodium ion battery and preparation method thereof

A technology for sodium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the inconsistency in the proportion of precursor metals and feed ratios, the difficulty of controllable preparation of target products, and the limited high-current cycling capability of materials, etc. problems, to achieve the effect of easy control of the feeding ratio, enhanced dynamic characteristics, and stable structure

Inactive Publication Date: 2020-11-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

The traditional co-precipitation method to prepare hydroxide or carbonate precursors, due to the harsh conditions for preparing precursors based on Cu, Ni and Mn, and carbonate precursors cannot be realized, and because the precipitation solubility of each metal ion is different , it is easy to lead to inconsistent metal ratio and feed ratio in the precursor, so that the control of material components is insufficient, and the target product is difficult to achieve controllable preparation
It has also been reported that the controllable preparation of Ni-doped or Ni-Co co-doped P2-type manganese-based spherical cathode materials has been achieved by co-precipitation method, but the prepared materials have limited high-current cycle capability and insufficient cycle stability, which restricts its further development

Method used

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  • A kind of positive electrode material of spherical sodium ion battery and preparation method thereof
  • A kind of positive electrode material of spherical sodium ion battery and preparation method thereof
  • A kind of positive electrode material of spherical sodium ion battery and preparation method thereof

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preparation example Construction

[0036] A preparation method of a spherical sodium ion battery positive electrode material, comprising the steps of:

[0037] (1) Prepare spherical MnCO by co-precipitation method with ammonium bicarbonate and manganese sulfate in ethanol and water 3 powder;

[0038] a. Ultrasonic dissolve ammonium bicarbonate and manganese sulfate in deionized water respectively to obtain concentrations of 0.1-0.3mol L -1 , 0.01~0.03mol L -1 clear solution of

[0039] b. Add equal volumes of ammonium bicarbonate clarified solution and manganese sulfate clarified solution into equal volume ethanol respectively, the substance ratio of said ammonium bicarbonate and manganese sulfate is 10~30:1, mix the solution at room temperature After stirring for 3 hours, a milky white suspension was obtained;

[0040] c. Let the milky white suspension stand, pour off the supernatant, put it into a centrifuge for centrifugation, then use water and ethanol to disperse, centrifuge, and wash in turn to obtain...

Embodiment 1

[0047] Weigh 0.0014mol of ammonium bicarbonate and 0.014mol of manganese sulfate and dissolve them in 140mL deionized water beakers, respectively, ultrasonically for 1 minute, so that the raw materials are completely dissolved and mixed evenly to obtain a clear solution, and then added to the beaker containing 14mL of ethanol in turn, Stir for 3 hours, make it fully mixed, let it stand for 20 minutes, pour off the supernatant, then centrifuge at 8000 rpm for 5 minutes, then wash with deionized water and ethanol once respectively, and then put in Dry in an oven at 80°C for 1 hour to obtain light yellow spherical MnCO 3 powder, light yellow spherical MnCO 3 Put the powder in a clean small magnetic boat. After the muffle furnace rises to 400°C with a power of 100W, place the small magnetic boat in the middle of the muffle furnace and keep it for 5 hours. When the holding time is reached, quickly remove the small magnetic boat from Take it out from the muffle furnace and make it ...

Embodiment 2

[0053]Weigh 0.042mmol of ammonium bicarbonate and 0.0014mmol of manganese sulfate and dissolve them in 140mL deionized water beakers, respectively, ultrasonically for 1 minute to completely dissolve the raw materials and mix them uniformly to obtain a clear solution, then add them to the beakers containing 14mL of ethanol in turn, Mix the two solutions evenly, stir for 3 hours, make them fully mixed, let stand for 20 minutes, pour off the supernatant, then centrifuge at 8000 rpm for 5 minutes, then wash with deionized water and ethanol in turn. 1 time, and then dried in an oven at 80°C for 1 hour to obtain light yellow spherical MnCO 3 powder, light yellow spherical MnCO 3 Put the powder in a clean small magnetic boat. After the muffle furnace rises to 350°C with a power of 100W, place the small magnetic boat in the middle of the muffle furnace and keep it for 5 hours. When the holding time is reached, quickly remove the small magnetic boat from Take it out of the muffle furn...

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Abstract

The invention discloses a preparation method of a spherical sodium ion battery positive electrode material. The preparation method comprises the following steps: (1) preparing spherical MnCO3 powder from ammonium bicarbonate and manganese sulfate in ethanol and water by a coprecipitation method; (2) carrying out heat treatment on the spherical MnCO3 powder in an air atmosphere to obtain sphericalMnO2 precursor powder; (3) ultrasonically mixing the spherical MnO2 precursor powder with metal salt in water according to a stoichiometric ratio, and drying to obtain black powder; and (4) carrying out high-temperature reaction on the black powder in an air atmosphere to obtain the spherical sodium ion battery positive electrode material. The invention also discloses the spherical sodium ion battery positive electrode material prepared by the above steps. Manganese carbonate is used as a precursor, and the amount of required metal salt is regulated and controlled according to product requirements. The preparation of a Cu and Ni substituted component-controllable spherical structure is achieved. The reaction kinetics is obviously improved. The cycle life is obviously prolonged. The material and the preparation method have the guiding effect on the development of a novel sodium ion battery positive electrode material.

Description

technical field [0001] The invention relates to the fields of preparation of chemical power source materials and sodium ion positive electrode materials, in particular to a spherical sodium ion battery positive electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for energy storage lithium-ion batteries worldwide, the storage capacity of lithium resources will not be able to meet the large-scale energy storage needs of lithium-ion batteries in the future. Na-ion batteries and lithium-ion batteries have similar structural and physical and chemical characteristics, and because sodium resources are abundant, widely distributed, easy to obtain, and low in price, sodium-ion batteries have a competitive advantage in cost and are suitable for large-scale energy storage. It is a new type of green and environment-friendly energy storage battery with great development prospects. In addition, the performance of the cathode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/485H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 康文裴马平曹东炜王玉玉孙道峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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