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Preparation method of magnesium ion battery positive electrode material

A magnesium ion battery and positive electrode material technology, applied in the field of preparation of magnesium ion battery positive electrode materials, can solve the problems of harsh preparation process, high raw material purity and production equipment requirements, and achieve low specific capacity, slow diffusion kinetics, and reduced The effect of production costs

Pending Publication Date: 2022-04-19
CHONGQING UNIV
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing anode materials for magnesium-ion batteries, so as to solve the problems in the prior art that the preparation process of cathode materials for magnesium-ion batteries is harsh, and the requirements for raw material purity and production equipment are high. question

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  • Preparation method of magnesium ion battery positive electrode material
  • Preparation method of magnesium ion battery positive electrode material
  • Preparation method of magnesium ion battery positive electrode material

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preparation example Construction

[0037] One, a kind of preparation method of positive electrode material of magnesium ion battery

[0038] In the prior art, sodium vanadium polyacid / vanadium polyacid has a unique porous layered structure and interlayer structure water, and its porous layer structure can provide fast intercalation / extraction transport channels for magnesium ions, and its interlayer structure water can Shielding the strong electrostatic interaction between the guest magnesium ions and the lattice framework, the diffusion kinetics of magnesium ions in it is excellent, which can solve the problem of slow diffusion kinetics of magnesium ions in the cathode materials of traditional magnesium ion batteries. At the same time, the support of structural water can keep the porous layered structure stable, which can solve the problem of poor cycle performance of traditional magnesium-ion battery cathode materials. Moreover, the valence state of active vanadium is changeable, and a single vanadium atom can...

Embodiment 1

[0040] (1) Desiliconization of sodium vanadate solution: 50 mL sodium vanadate solution (the content of vanadium element is 41.79 g / L, the content of silicon element is 1.2585 g / L), adjust the pH of sodium vanadate solution with sulfuric acid to 3.2 , add 0.2 g of anionic polyacrylamide CPAM, stir the reaction at room temperature at a stirring speed of 200 r / min for 30 min, let it stand for 14 h, filter, wash the filter residue with deionized water 2 to 3 times, and filter twice. The measured desiliconization rate is 84.37%, the vanadium loss rate is 1.24%, and the filtrate is called vanadium qualified liquid;

[0041] (2) Vanadium precipitation of sodium salt of qualified vanadium solution: at room temperature, add the qualified vanadium solution dropwise into 0.5mol / L sulfuric acid solution while stirring until the pH of the mixed solution is 1.6, and put the mixed solution at T=90℃ , stirred and reacted at a stirring speed of 200r / min for 60min, the solution was naturally c...

Embodiment 2

[0043] (1) Desiliconization of sodium vanadate solution: 50mL sodium vanadate solution (the content of vanadium element is 41.79g / L, the content of silicon element is 1.2585g / L), adjust the pH of sodium vanadate solution with sulfuric acid=3.2, Add 0.2g of anionic polyacrylamide CPAM, stir and react at room temperature for 30min at a stirring speed of 200r / min, let stand for 14h, filter, wash the filter residue 2~3 times with deionized water, and filter twice. The measured desiliconization rate is 84.21%, the vanadium loss rate is 1.15%, and the filtrate is called vanadium qualified liquid;

[0044] (2) Vanadium precipitation of sodium salt of qualified vanadium solution: at room temperature, add qualified vanadium solution dropwise into 0.5mol / L sulfuric acid solution while stirring until the pH of the mixed solution is 1.8, and put the mixed solution at T=90℃ , stirred and reacted at a stirring speed of 200r / min for 60min, the solution was naturally cooled to room temperatur...

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Abstract

The invention discloses a magnesium ion battery positive electrode material preparation method, which comprises: a, adjusting the pH value of an extraction liquid obtained by industrial vanadium extraction to an acidic state, carrying out desilicication treatment, filtering, separating, and collecting solid-liquid to obtain a filtrate which is a vanadium qualified liquid; and b, adding a sulfuric acid solution into the vanadium qualified solution until the pH value is acidic, precipitating vanadium polyacid salt / vanadium polyacid, and filtering to obtain a solid which is the magnesium ion battery positive electrode material. According to the method, the high-vanadium-content complex sodium vanadate solution obtained by industrial vanadium extraction is directly adopted as a raw material to replace a commercial vanadium-containing reagent, a simple chemical precipitation method is adopted to replace a traditional hydrothermal method, rapid and large-scale batch preparation of the vanadium polyacid sodium hydrogen / vanadium polyacid sodium / vanadium polyacid positive electrode material can be realized, the production cost is greatly reduced, and the method is suitable for industrial production. The whole process flow is simple to operate, is compatible with the existing vanadium extraction process, and is very beneficial to industrial application.

Description

technical field [0001] The invention relates to the technical field of magnesium ion batteries, in particular to a preparation method of a positive electrode material of a magnesium ion battery. Background technique [0002] Rechargeable battery technologies have greatly improved in terms of low cost, high energy density, etc., which are hugely attractive due to the rapid development of carbon-free transportation and renewable energy. This trend has promoted research on high-energy lithium-ion batteries. However, due to the safety issues of lithium dendrites, the complex methods used to prevent the formation of lithium dendrites, and the supply risk of lithium resources, based on Mg 2+ , Ca 2+ , Zn 2+ or Al 3+ Alternative battery technologies for the transfer of multivalent ions such as ions have attracted increasing attention. [0003] Magnesium has an ultra-high theoretical volumetric energy density (3833 mAh cm -3 ), coupled with the abundance of magnesium resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/485H01M10/054
CPCC01G31/00H01M4/485H01M10/054H01M2004/028C01P2002/72C01P2006/40
Inventor 李鸿乂马秀芬陈富玉王美美刁江谢兵潘复生
Owner CHONGQING UNIV
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