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Method for preparing magnesium ion battery positive electrode material

A magnesium-ion battery and positive electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that magnesium batteries cannot meet the use environment, and achieve the effect of large-scale industrial production, good electrochemical performance, and large reserves

Inactive Publication Date: 2018-06-08
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this level of magnesium batteries is far from being able to meet the increasingly complex use environment.

Method used

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  • Method for preparing magnesium ion battery positive electrode material
  • Method for preparing magnesium ion battery positive electrode material
  • Method for preparing magnesium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Pretreatment: Weigh raw materials according to the composition of ferrous magnesium borate, including magnesium source compound, ferrous source compound, borate compound, 1.0mol magnesium source compound magnesium oxalate, 1.0mol ferrous source compound ferrous oxalate, 2.0mol boric acid The root compound boric acid is accurately weighed and mixed, added with deionized water, ball milled and dried at 120°C to obtain the mixture.

[0033] Precursor preparation: The mixture was pre-fired at 350° C. for 3 hours in a helium atmosphere, and then crushed into powder to obtain a precursor.

[0034] Post-processing: Mix the carbon source compound glucose and the precursor at a weight ratio of 0.35:1, ball mill and dry, and then sinter at 750°C for 8 hours under the protection of argon to obtain the carbon-coated ferrous magnesium borate battery cathode material.

[0035] Finished product: Magnesium ferrous borate magnesium ferrous borate MgFeB coated with the synthesized carbon...

Embodiment 2

[0037] Pretreatment: Weigh raw materials according to the composition of ferrous magnesium borate, including magnesium source compound, ferrous source compound, borate compound, 0.8mol magnesium hydroxide compound magnesium source, 1.0mol ferrous source compound ferrous acetate, 1.0mol The borate compound diboron trioxide is accurately weighed and mixed, added with deionized water, ball milled and then dried to obtain the mixture.

[0038] Precursor preparation: the mixture was pre-fired at 400° C. for 2 hours in a helium atmosphere, and then pulverized into powder to obtain a precursor.

[0039] Post-processing: Mix the carbon source compound ascorbic acid and the precursor at a weight ratio of 0.5:1, ball mill and dry, and then sinter at 850°C for 6 hours under the protection of argon to obtain the carbon-coated ferrous magnesium borate battery positive electrode material.

[0040] Finished product: the synthesized magnesium ion battery cathode material Mg 0.8 Fe 1.2 B2 o ...

Embodiment 3

[0042] Pretreatment: Weigh raw materials according to the composition of ferrous magnesium borate, including magnesium source compound, ferrous source compound, borate compound, 1.05mol magnesium source compound magnesium acetate, 0.95mol ferrous source compound ferrous acetate, 2.0mol boric acid The root compound boric acid is accurately weighed and mixed, added with deionized water, ball milled and dried at 120°C to obtain the mixture.

[0043] Precursor preparation: the mixture was pre-fired at 450° C. for 2 hours in a helium atmosphere, and then crushed into powder to obtain a precursor.

[0044] Post-processing: Mix the carbon source compound polyethylene glycol with the precursor at a weight ratio of 0.4:1, ball mill and dry, and then sinter at 800°C for 7 hours under the protection of argon to obtain a carbon-coated magnesium ferrous borate battery positive electrode Material.

[0045] Finished product: the synthesized magnesium ion battery cathode material Mg 1.05 Fe...

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Abstract

The invention belongs to the technical field of battery materials, and concretely relates to a method for preparing a magnesium ion battery positive electrode material. The magnesium ion battery positive electrode material is carbon coated magnesium ferrous borate, wherein the magnesium ferrous borate mainly comprises a magnesium source compound, a ferrous source compound and a borate radical compound. The magnesium ferrous borate synthesized from common raw materials in the invention is a novel magnesium ion battery positive electrode material having an extremely rich source and an excellentapplication prospect. Compared with currently widely studied phosphate polyanion compound magnesium ion battery positive electrode materials, the positive electrode material in the invention achievesa higher theoretic specific capacity by replacing a phosphate radical having a large mole with a borate radical having a small mole from structural analysis. The electric conduction capability of ferrous borate is stronger than that of ferrous phosphate, the volume change rate of the ferrous borate before and after discharge is lower than that of the ferrous phosphate before and after discharge and is less than half of that of the ferrous phosphate, so the magnesium ferrous borate positive electrode material has good rate performances and a good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a preparation method of a positive electrode material of a magnesium ion battery. Background technique [0002] With the continuous development of economy and technology, human's demand for energy is increasing day by day. At present, fossil energy is facing exhaustion, and people have intensified efforts to develop various renewable energy sources. Solar energy, wind energy, etc. have begun to occupy a place in the energy field. However, these renewable energy sources are greatly affected by weather and time, and are obviously unstable, discontinuous, and uncontrollable. It is necessary to develop special electric energy storage devices to ensure the continuity and stability of power generation and power supply. Among the existing energy storage devices, rechargeable energy storage batteries are the most commonly used energy storage devices. Lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625Y02E60/10
Inventor 袁正勇黄伟豪倪佳颖
Owner NINGBO POLYTECHNIC
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