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Modified positive pole material of magnesium secondary battery and preparing method thereof

A technology for magnesium secondary batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of harsh preparation conditions, poor oxidation resistance, and small ionic radius, and achieve simple and easy preparation methods, low cost, The effect of high specific capacity

Active Publication Date: 2013-05-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in terms of positive electrode materials for rechargeable magnesium batteries, compared to Li + Say, Mg 2+ The ionic radius is small, the charge density is large, and the solvation is more serious, so Mg 2+ Billy + Difficult to embed in general matrix materials
Moreover, Mg 2+ Movement in embedded materials is also difficult
The Cheverel phase sulfide Mo reported by the Aurbach group 3 S 4 (Theoretical capacity 122mAh / g) is a better Mg 2+ Intercalation / extraction material, Mg 2+ Available at Mo 6 S 8 The actual discharge capacity can reach about 100mAh / g, and the discharge voltage platform is between 1.2V and 1.0V (vs.Mg / Mg 2+ ), the main disadvantage is poor oxidation resistance and harsh preparation conditions

Method used

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  • Modified positive pole material of magnesium secondary battery and preparing method thereof
  • Modified positive pole material of magnesium secondary battery and preparing method thereof
  • Modified positive pole material of magnesium secondary battery and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The tetravalent magnesium molybdate Mg of embodiment 1 heteropolyacid modification 1+x MoO 3 (x=0.03) Preparation

[0022] (1), adopt magnesium carbonate, molybdenum trioxide, activated carbon as raw material, the consumption of raw material is Mg according to the molar ratio of atom: Mo: C=1.03: 1: 1 ratio weighs; First raw material is fully ground, after mixing uniformly Rapidly heat up to 500°C in argon, burn for 6 hours, then cool naturally, grind, put the ground powder into the furnace, protect with argon, control the heating rate of 5°C / min, heat up to 820°C and burn For 18 hours, finally control the cooling rate to 5°C / min, and cool down to 200°C to obtain tetravalent magnesium molybdate powder;

[0023] (2), the heteropolyacid (H 3 PMo 12 o 40 ) was dissolved in deionized water, adding vacuum-dried graphite and metal magnesium powder to form a solution, in the solution by mass ratio, heteropoly acid was 3%, graphite was 0.1%, metal magnesium powder was 0.1%...

Embodiment 2

[0034] The tetravalent magnesium molybdate Mg of embodiment 2 heteropolyacid modification 1+x MoO 3 (x=0.1) Preparation

[0035] (1), adopt magnesia, molybdenum trioxide, gac to be raw material, the consumption of raw material is the ratio of Mg:Mo:C=1.1:1:1 according to the mol ratio of atom to take by weighing; First raw material is fully ground, after mixing uniformly Rapidly heat up to 500°C in argon, burn for 6 hours, then cool naturally, grind, put the ground powder into the furnace, protect with argon, control the heating rate of 5°C / min, heat up to 850°C and burn For 20 hours, finally control the cooling rate to 5°C / min, and cool down to 200°C to obtain tetravalent magnesium molybdate powder;

[0036] (2), the heteropolyacid (H 4 PMo 11 VO 40 ) was dissolved in deionized water, adding vacuum-dried graphite and metal magnesium powder to form a solution, in the solution by mass ratio, heteropoly acid was 2%, graphite was 0.2%, metal magnesium powder was 0.2%, deioni...

Embodiment 3

[0038] Example 3 Heteropoly acid modified tetravalent magnesium molybdate Mg 1+x MoO 3 (x=0.05) Preparation

[0039] (1), adopt magnesium acetate, molybdenum trioxide, activated carbon as raw material, the consumption of raw material is Mg according to the molar ratio of atom: Mo: C=1.05: 1: 1 ratio takes by weighing; First raw material is fully ground, after mixing uniformly Rapidly heat up to 500°C in argon, burn for 6 hours, then cool naturally, grind, put the ground powder into the furnace, protect with argon, control the heating rate of 5°C / min, heat up to 800°C and burn For 12 hours, finally control the cooling rate to 5°C / min, and cool down to 200°C to obtain tetravalent magnesium molybdate powder;

[0040] (2), the heteropolyacid (H 3 PW 12 o 40 ) was dissolved in deionized water, adding vacuum-dried graphite and metal magnesium powder to form a solution. In the solution, by mass ratio, heteropolyacid was 4%, graphite was 0.2%, metal magnesium powder was 0.2%, and...

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Abstract

The invention relates to modified positive pole material of a magnesium secondary battery and a preparing method thereof. The positive pole material adopts quadrivalent magnesium molybdate modified by heteropoly acid, and the content of the quadrivalent magnesium molybdate is 85 percent to 99 percent and the content of the heteropoly acid is 1 percent to 15 percent according to mass percent. The chemical structural formula of the quadrivalent magnesium molybdate is Mg1 plus xMoO3, wherein x is larger than 0 and smaller than or equal to 0.1; and the preparing method of the positive pole material comprises the steps as follows: magnesium compound, molybdic compound and active carbon are adopted as raw materials, argon is taken as protective gas, quadrivalent magnesium molybdate powder is prepared after a high-temperature solid phase reaction method, and then the powder is modified through heteropoly acid, so that the positive pole material of the magnesium secondary battery is obtained.The positive pole material has good electrochemical charge-discharge behaviors, and compared with the ideal positive pole material Mo3S4 of the prior magnesium secondary battery, the preparing methodhas the advantages that the preparing method is simple, the cost is low, and the preparing method has high specific capacity, good circulating performance, reversibility, and obvious practical value and economic benefit.

Description

technical field [0001] The invention relates to a modified positive electrode material for a magnesium secondary battery and a preparation method thereof, in particular to a tetravalent magnesium molybdate positive electrode material modified by a heteropolyacid and a preparation method thereof. Background technique [0002] Magnesium secondary battery is a new type of rechargeable battery developed based on the theory of lithium-ion batteries. Magnesium is a group II metal in the diagonal position to lithium in the periodic table of elements, and thus has similar physical and chemical properties to lithium. Magnesium is cheap (about 1 / 24 of lithium), environmentally friendly, has a high melting point (649°C), is easy to process, has poorer activity than lithium, and is safer. Therefore, it is a good idea to use magnesium compounds as magnesium batteries. A chemical power source with good application prospects. In 2000, the Mg|0.25mol / LMg(AlCl 2 BuEt) 2 / THF|Mg x Mo 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/04
CPCY02E60/12Y02E60/10
Inventor 吴晓梅曾小勤丁文江李德江李斐张思
Owner SHANGHAI JIAO TONG UNIV
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