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Magnesium iron silicate olivine used as positive electrode material of magnesium ion storage battery, and synthetic method of magnesium iron silicate olivine

A synthesis method and positive electrode material technology, applied in battery electrodes, secondary batteries, silicon compounds, etc., can solve problems such as high energy consumption, disappearance of charging capacity, poor stability, etc., and achieve good quality consistency and reduced energy consumption Effect

Inactive Publication Date: 2018-01-19
杨晓波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle stability of these materials is insufficient, and most of their charge capacity disappears after several charge-discharge cycles.
[0004] Chinese patent CN 201410332284 teaches a cobalt-vanadium-titanium-magnesium phosphate multi-component positive electrode material with olivine structure, which is prepared by sol-gel followed by high-temperature sintering method. The discharge capacity is as high as 204mAh / g, and can be maintained at More than 95%, it is a feasible electrode material, but the synthesis process is more complicated, and the energy consumption and material cost are higher
The cycle stability of these materials has passed dozens of charge and discharge tests, and most of them can be kept above 90%, but the disadvantage is that the synthesis method used in these materials consumes a lot of energy, and the stability is not good, so it is not suitable for mass production

Method used

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  • Magnesium iron silicate olivine used as positive electrode material of magnesium ion storage battery, and synthetic method of magnesium iron silicate olivine
  • Magnesium iron silicate olivine used as positive electrode material of magnesium ion storage battery, and synthetic method of magnesium iron silicate olivine
  • Magnesium iron silicate olivine used as positive electrode material of magnesium ion storage battery, and synthetic method of magnesium iron silicate olivine

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Experimental program
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Effect test

preparation Embodiment 1

[0053] Prepare a three-necked bottle, one of the ports is connected to the pressure reducing valve of the nitrogen cylinder as the nitrogen inlet, a restrictor valve is installed on the second port as the nitrogen outlet, and the third port is connected to a dropping funnel as the feeding port, and the nitrogen gas is set. The flow rate is 600mL / h. Afterwards, 10 grams of deionized water was put into a three-necked bottle, and 0.5 grams of acetic acid was added, while continuous stirring was started with a magnetic stirrer at a stirring rate of 50 rpm. Then 2.0 grams of ferrous acetate were dissolved in 10 grams of deionized water and dropped into a three-necked bottle. Then 1.0 g of dimethoxymagnesium and 4.8 g of tetraethoxysilicon were successively added. Wherein the molar ratio of dimethoxymagnesium, ferrous acetate, tetraethoxy silicon, deionized water and acetic acid is Mg:Fe:Si:H2O:acetic acid=1:1:2:97:0.72. Finally, stirring was continued at room temperature for 12 h...

preparation Embodiment 2

[0058] Prepare a three-necked bottle, one of the ports is connected to the pressure reducing valve of the nitrogen cylinder as the nitrogen inlet, a restrictor valve is installed on the second port as the nitrogen outlet, and the third port is connected to a dropping funnel as the feeding port, and the nitrogen gas is set. The flow rate is 600mL / h. Afterwards, 7.5 grams of deionized water was put into a three-necked bottle, and 0.03 grams of acetic acid, 1.0 grams of magnesium acetate, and 0.8 grams of ferrous acetate were added, and at the same time, continuous stirring was started with a magnetic stirrer at a stirring rate of 50 rpm. Then, 1.4 g of 40 wt % ammonia stabilized high-purity silica sol was added dropwise. The molar ratio of magnesium acetate, ferrous acetate, 40wt% ammonia-stabilized high-purity silica sol, deionized water and acetic acid is Mg:Fe:Si:H2O:Acetic=1:1:2:100:0.1. Finally, stirring was continued at room temperature for 2 hours to obtain a light green...

preparation Embodiment 3

[0063] Prepare a three-necked bottle, one of the ports is connected to the pressure reducing valve of the nitrogen cylinder as the nitrogen inlet, a restrictor valve is installed on the second port as the nitrogen outlet, and the third port is connected to a dropping funnel as the feeding port, and the nitrogen gas is set. The flow rate is 600mL / h. Afterwards, 5.0 grams of deionized water was put into a three-necked bottle, and 0.4 grams of acetic acid, 1.0 grams of magnesium nitrate, and 1.9 grams of ferrous nitrate hexahydrate were added. At the same time, a magnetic stirrer was used to continuously stir at a stirring rate of 50 rpm. Afterwards, 2.0 g of 40 wt% ammonia-stabilized high-purity silica sol was added dropwise. The molar ratio of magnesium nitrate, ferrous nitrate hexahydrate, 40wt% ammonia stabilized high-purity silica sol, deionized water and acetic acid is Mg:Fe:Si:H2O:Acetic=1:1:2:50:1. Finally, stirring was continued for half an hour at room temperature to o...

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Abstract

The invention discloses a magnesium iron silicate olivine used as a positive electrode material of a magnesium ion storage battery, and a synthetic method of the magnesium iron silicate olivine. According to the synthetic method, a compound rich in raw materials and comprising divalent magnesium, divalent iron and tetravalent silicon is used as a precursor chemical reagent; by taking water as a medium and by taking acetic acid as a catalyst, the precursor chemical reagent hydrolysis is promoted to prepare hydrosol; next, the prepared hydrosol is sealed and heated to be crystallized in a formedhydrothermal condition; and after a certain time, the needed magnesium iron silicate olivine material is obtained. The method is simple and easy to implement, and the obtained product is spherical formed by super-thin nanoparticle aggregation.

Description

technical field [0001] The invention belongs to the technical field of magnesium ion storage battery material preparation, and in particular relates to ferric silicate forsterite used as a positive electrode material of magnesium ion storage battery, and also relates to a synthesis method thereof. Background technique [0002] Magnesium-ion batteries have attracted widespread attention due to their potential advantages of high capacity, high safety, and abundant raw materials. The world's first working prototype of a magnesium-ion battery was released by Aurbach et al. in 2000 (Nature, 2000, 407, 724-727). The molybdenum sulfide (Mo6S8) material positive electrode composition can be repeatedly charged and discharged hundreds to 2000 times, and the cycle power loss is less than 15%. However, the charge and discharge capacity of the molybdenum sulfide positive electrode material used in the prototype of the magnesium ion battery is only 122mAh / g, which cannot make full use of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054C01B33/20
CPCY02E60/10
Inventor 杨晓波赵向云
Owner 杨晓波