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Preparation method of manganese-doped sodium-ion battery positive electrode material

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of doping technology, less research on doping element doping, difficult process methods and parameter control, and process control. Stability requirements are extremely high and other issues, to achieve the effect of improving specific capacity, side reactions between barrier material interface and electrolyte, and stable properties

Pending Publication Date: 2022-03-25
GUANGDONG BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] However, the doping of materials has the following difficulties: ①The doping stage requires extremely high process control stability; ②It is difficult to obtain a uniform doping effect in the selection of doping elements, process methods and parameter control; ③Doping technology, doping elements , doping amount and other aspects of research is less, resulting in more difficult research and development and industrialization

Method used

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  • Preparation method of manganese-doped sodium-ion battery positive electrode material

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Embodiment 1

[0032] In this embodiment, a positive material for doping manganese sodium ion battery is prepared, and the specific process is:

[0033] (1) After dissolving the trioxide with hydrochloric acid, manganese chloride is added, formulated into a mixed metal salt solution having a total metal ion concentration of 0.1 mol / L, wherein the molar ratio of ruthenium and manganese is 5:95;

[0034] (2) The sodium hydroxide and a concentration of sodium hydroxide and a concentration of sodium hydroxide and a concentration of 0.3 mol / L were prepared, that is, an alkaline oxidant solution.

[0035] (3) The mixed metal salt solution is added dropwise to the alkaline oxidant solution, and the control reaction system temperature is 2-10 ° C, and the pH ≥ 10.5 of the basic oxidant solution is always ensured, the oxidant is always sufficient, and the reaction is completed. Solid-liquid separation is carried out to obtain solid materials;

[0036] (4) After the solid material is dried, the amount...

Embodiment 2

[0039] In this embodiment, a positive material for doping manganese sodium ion battery is prepared, and the specific process is:

[0040] (1) After dissolving the trioxide, a chloride solution was added to a mixed metal salt solution having a total concentration of 0.2 mol / L of a metal ion, wherein the molar ratio of bismuth and manganese was 5:95;

[0041] (2) The mixture of sodium hydroxide and sodium hydroxide having a concentration of 2.0 mol / L is formulated, that is, a basic oxidant solution;

[0042] (3) The mixed metal salt solution is added dropwise to the alkaline oxidant solution, and the control reaction system temperature is 2-10 ° C, and the pH ≥ 10.5 of the basic oxidant solution is always ensured, the oxidant is always sufficient, and the reaction is completed. Solid-liquid separation is carried out to obtain solid materials;

[0043] (4) After drying, the solid material is dried in low temperature, the ratio of the substance of the sodium atom and the manganese...

Embodiment 3

[0046] In this embodiment, a positive material for doping manganese sodium ion battery is prepared, and the specific process is:

[0047](1) After dissolving the trioxide and trioxide with hydrochloric acid, manganese chloride is added, formulated into a mixed metal salt solution having a total metal ion concentration of 0.3 mol / L, wherein the molar ratio of antimony, bismuth and manganese is 5: 5: 90;

[0048] (2) A mixed solution of sodium hydroxide and sodium hydroxide having a concentration of 4.0 mol / L is a concentration of sodium hypochlorite, which is an alkaline oxidant solution.

[0049] (3) The mixed metal salt solution is added dropwise to the alkaline oxidant solution, and the temperature of the reaction system is 2-10 ° C and always ensures that the basic oxidant solution pH ≥ 10.5, the oxidant is always sufficient, and the reaction is completed Solid-liquid separation to obtain solid materials;

[0050] (4) After drying, the solid material is dried in low tempera...

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Abstract

The invention discloses a preparation method of a manganese-doped sodium-ion battery positive electrode material, which comprises the following steps: dissolving one or two of antimony trioxide and bismuth trioxide with acid, adding a divalent manganese salt to prepare a mixed metal salt solution, adding the mixed metal salt solution into an alkaline oxidant solution, and reacting to obtain the manganese-doped sodium-ion battery positive electrode material. And carrying out solid-liquid separation to obtain a solid material, drying the solid material, mixing the solid material with a sodium source, and sintering to obtain the manganese-doped sodium ion battery positive electrode material. The antimony or bismuth element is doped, the skeleton structure of the material is enhanced, the phase change of the material in the charge-discharge process is inhibited, the specific capacity, the cycle performance and the rate capability of the material can be obviously improved, the mixed metal salt solution is dropwise added into the excessive alkaline oxidant solution, manganese ions are oxidized into manganese dioxide, and the specific capacity, the cycle performance and the rate capability of the material are improved. Antimony and bismuth are co-precipitated with manganese dioxide in the form of hexahydroxy sodium antimonate or sodium bismuthate, so that the uniformity of doped elements of the material is ensured, and atomic-scale mixing of the elements is realized.

Description

Technical field [0001] The present invention belongs to the technical field of sodium ion batteries, and in particular to a method of preparing a positive electrode material doped with manganese sodium ion battery. Background technique [0002] The sodium ion battery has the characteristics of low raw material cost, rich resources, and powerful electrochemical performance. It is expected to be applied in large-scale energy storage, is one of the important research directions of next-generation battery technology. [0003] The demand for new energy storage systems and the continuous expansion of the sodium ion battery market have enabled high performance sodium electrode materials. Positive material material is an important factor affecting battery energy density, service life, cost, and developing high-efficiency positive electrode materials is essential for promoting the commercialization of sodium ion batteries. [0004] At present, the common sodium ion battery positive electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00H01M4/505H01M4/485H01M10/054
CPCC01G45/006H01M4/505H01M4/485H01M10/054H01M2004/028C01P2006/40C01P2002/52C01P2002/54Y02E60/10C01G45/1228C01G45/02
Inventor 余海军谢英豪李爱霞张学梅李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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