A kind of preparation method for sodium-ion battery cathode material sodium manganite

A sodium-ion battery and sodium manganite technology, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as low working voltage, low specific capacity of positive electrode materials, and lagging research progress in sodium-ion batteries

Active Publication Date: 2019-11-19
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Sodium and lithium belong to the first main group and have similar chemical properties, while the radius of sodium ions is 30% larger than that of lithium ions, and the larger atomic mass reduces the energy density of sodium-ion batteries
Although the initial research time is similar to that of lithium-ion batteries, the research progress of sodium-ion batteries is relatively lagging behind. The existing cathode materials for sodium-ion batteries have low specific capacity and low operating voltage.

Method used

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  • A kind of preparation method for sodium-ion battery cathode material sodium manganite
  • A kind of preparation method for sodium-ion battery cathode material sodium manganite
  • A kind of preparation method for sodium-ion battery cathode material sodium manganite

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Effect test

Embodiment 1

[0026] Add 0.015mol manganese dioxide and 0.037mol sodium hydroxide into the mortar respectively, grind and mix them evenly, then transfer the powder to a porcelain boat, and react in a tube furnace at 500°C for 10h under an argon atmosphere. Then naturally cool to room temperature, take out the product and wash it with water until the filtrate is neutral, then dry it in vacuum at 80°C, and grind the dried sample to obtain the product Na 2 MnO 3 . The X-ray powder diffraction pattern of the sample can be found in figure 1 , indicating that the resulting product is pure phase Na 2 MnO 3 , high crystallinity. The resulting product was used as the positive electrode material, and an experimental button-type sodium secondary battery was assembled in an argon-filled glove box. The charge-discharge cycle was carried out at a rate of 0.1C in the potential range of 2.0-4.6V. The specific capacity of the first discharge was 120mAh / g, showing excellent electrochemical performance. ...

Embodiment 2

[0028] Add 0.015 mol of manganese dioxide and 0.03 mol of sodium acetate into the mortar respectively, grind and mix evenly, then transfer the powder to a porcelain boat, react in a tube furnace at 450°C for 12 hours under a nitrogen atmosphere, and then naturally Cool to room temperature, take out the product and wash it with water until the filtrate is neutral, then dry it in vacuum at 110°C, and grind the dried sample to obtain the product Na 2 MnO 3 .

Embodiment 3

[0030] Add 0.015 mol of manganese dioxide and 0.03 mol of sodium nitrate into the mortar respectively, grind and mix evenly, then transfer the powder to a porcelain boat, react in a tube furnace at 600°C for 8 hours under a nitrogen atmosphere, and then naturally Cool to room temperature, take out the product and wash it with water until the filtrate is neutral, then vacuum-dry at 70°C, grind the dried sample to obtain the product Na 2 MnO 3 .

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Abstract

The invention discloses a solid phase preparation method of sodium manganite Na2MnO3 of sodium secondary battery high voltage cathode materials. The method is characterized by comprising the following steps: grinding and uniformly mixing a manganese source compound and a sodium source compound at certain chemical stoichiometric ratio; transferring an obtained mixture into a tube furnace, and enabling the mixture to be reacted at 400 to 700 DEG C under the protection of inert gas and to be cooled to room temperature; grinding a precursor, washing the precursor to be neutral through distilled water, and performing drying, dewatering and grinding, so as to obtain the target material sodium manganite. The method has the advantages that the materials are added at one time, the technology is simple to operate, raw materials are cheap and easy to get, the product purity is high, and both the process control and product performance have good repeatability. The obtained Na2MnO3 material is high in potential platform, shows up excellent electrochemical property, and can provide a novel thought for the further research and functionization of the high energy density cathode materials.

Description

technical field [0001] The invention relates to sodium manganite Na, a high-voltage positive electrode material for a sodium ion battery 2 MnO 3 The preparation method, in particular relates to the method for preparing high-purity sodium manganese battery cathode material sodium manganese by using a simple and easy solid-phase method, and belongs to the technical field of sodium ion battery materials. Background technique [0002] With the growth of population, the global warming caused by the burning of fossil fuels, and the increase in the cost of mining fossil fuels, human beings increasingly need to be liberated from dependence on non-renewable energy sources. Inexhaustible sources of energy do not exist, and wind energy and solar energy are ideal choices. However, their uneven distribution between day and night and seasonality limits large-scale development and utilization. The electric energy converted from wind energy and solar energy must be stored centrally to mee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/054
CPCC01G45/125C01P2002/72C01P2006/40H01M4/505H01M10/054Y02E60/10
Inventor 刘振江冯季军
Owner UNIV OF JINAN
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