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Preparation method of composite cathode material of rechargeable magnesium battery

A composite cathode material and magnesium battery technology, applied in the field of rechargeable magnesium battery composite cathode material and its preparation, can solve the problems of containing harmful elements Cd and Pb, polluting the environment, and being unfeasible, and achieve good cycle stability and high energy The effect of density and long service life

Inactive Publication Date: 2016-03-09
宁波高新区锦众信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of them are clearly ideal or feasible for application in electric vehicles
The obvious disadvantage of the first two batteries is that they contain harmful elements Cd and Pb, which seriously pollute the environment
Lithium-ion batteries can be used for small-capacity power storage, but when the capacity is large, there will be safety problems due to the special activity of lithium; moreover, the price of lithium is relatively high, and the reserves are not much

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of Rare Earth Doped Vanadium Magnesium Silicate Precursor

[0027] Mix silicon dioxide, vanadium hydroxide, magnesium oxalate, and dysprosium oxide according to the Si:V:Mg:Dy molar ratio of 1:1:1:0.005, stir evenly after mixing, and add to a fluidized bed jet mill for pulverization , to obtain a mixture, add 0.5wt% sodium hexametaphosphate dispersant to the mixture, then add an appropriate amount of water, then stir evenly to obtain a slurry, filter and wash the above slurry, and then dry it at 100°C to obtain a nano precursor body.

[0028] Preparation of porous carbon materials doped with nitrogen

[0029] Immerse the dry microporous molecular sieve template into a solution containing starch, the mass ratio of microporous molecular sieve and starch is 1:0.5, stir at room temperature for 5 hours until the starch is fully immersed in the pores of the template, and then treat at 50°C 20 hours; place the compound obtained above in a tube furnace, and after ...

Embodiment 2

[0033] Preparation of Rare Earth Doped Vanadium Magnesium Silicate Precursor

[0034] Mix silicon dioxide, vanadium hydroxide, magnesium oxalate, and dysprosium oxide according to the Si:V:Mg:Dy molar ratio of 1:1.03:0.97:0.01, stir evenly after mixing, and add to a fluidized bed jet mill for pulverization , to obtain a mixture, add 0.8wt% sodium hexametaphosphate dispersant to the mixture, then add an appropriate amount of water, then stir evenly to obtain a slurry, filter and wash the above slurry, and then dry at 110°C to obtain a nano precursor body.

[0035] Preparation of porous carbon materials doped with nitrogen

[0036] Immerse the dry microporous molecular sieve into the solution containing starch, the mass ratio of microporous molecular sieve and starch is 1:1.5, stir at room temperature for 5 hours, until the starch is fully immersed in the pores of the template, and then treat it at 50°C for 10 hour; the compound obtained above is placed in a tube furnace, and ...

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Abstract

The invention discloses a composite cathode material of a rechargeable magnesium battery and a preparation method thereof. The preparation method comprises the following steps of mixing and crushing silicon dioxide, vanadium hydroxide, magnesium oxalate and dysprosium oxide to obtain a mixture, and adding a sodium hexametaphosphate dispersing agent and water to obtain a nanometer precursor; immersing a template into a solution including starch, and carbonizing by the entrance of the mixed gas of acetonitrile and nitrogen; adding a carbonized compound into a hydrofluoric acid solution to obtain an N-doped porous carbon material after removal of the template; and carrying out ball milling and sintering on the precursor and the porous carbon material to obtain a carbon-coated rare-earth doped vanadium magnesium silicate composite material. According to the prepared composite material, the vanadium magnesium silicate is taken as a base material, Dy is added to modify the vanadium magnesium silicate, and nitrogen-doped porous carbon is adopted to coat the vanadium magnesium silicate, so that when the composite material is used for the rechargeable magnesium battery, the composite material has higher energy density and good cycling stability, and the battery has high specific capacity and a longer service life.

Description

technical field [0001] The present invention relates to a preparation method of a battery cathode material, in particular to a rechargeable magnesium battery composite cathode material and a preparation method thereof Background technique [0002] The application of storage batteries in modern society is becoming more and more important and widespread, as can be seen from the extensive application of lithium-ion batteries that have been commercialized in recent years. In addition, with the aggravation of environmental pollution and the increasingly serious energy crisis, there is an urgent need for the popularization of electric vehicles. [0003] The rechargeable batteries currently in use are mainly Ni-Cd, lead-acid, Ni-MH and lithium-ion batteries. None of them are clearly ideal or feasible for application in electric vehicles. The obvious disadvantage of the first two batteries is that they contain harmful elements Cd and Pb, which seriously pollute the environment. L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 王欣欣
Owner 宁波高新区锦众信息科技有限公司
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