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Selenium-heteroatom doped graphene hollow sphere composite positive electrode material and preparation method thereof

A technology of composite cathode materials and heteroatoms, which is applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of low energy density and small selenium loading of lithium-selenium batteries, and can suppress the shuttle effect and improve the loading capacity. , the effect of high energy density

Inactive Publication Date: 2018-10-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the mesoporous nature of the loading material, the loading amount of selenium is relatively small, and the energy density of the final lithium-selenium battery is relatively low.

Method used

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  • Selenium-heteroatom doped graphene hollow sphere composite positive electrode material and preparation method thereof
  • Selenium-heteroatom doped graphene hollow sphere composite positive electrode material and preparation method thereof

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Embodiment 1

[0025] A preparation method of the selenium-heteroatom-doped graphene hollow sphere composite cathode material proposed by the present invention comprises the following steps: respectively preparing graphene oxide aqueous solutions with a mass volume concentration of 1 mg / mL, and a mass volume concentration of 1 mg / mL mL of silicon dioxide dispersion and hydrazine hydrate aqueous solution with a mass volume concentration of 1 mg / mL, wherein, in the silicon dioxide dispersion, the diameter of silicon dioxide is 10 nm; the above graphene oxide aqueous solution, silicon dioxide dispersion, The hydrazine hydrate aqueous solution is mixed according to the volume ratio of 1:1:1, and the ultrasonic dispersion is uniform to obtain a suspension; the suspension is spray-dried, and the feed is fed by a peristaltic pump, the feed speed is 1mL / min, and the feed inlet temperature is 150 ℃, the discharge temperature is 110°C, collect the spray-dried product, put it in a tube furnace under the...

Embodiment 2

[0029] A preparation method of the selenium-heteroatom-doped graphene hollow sphere composite positive electrode material proposed by the present invention comprises the following steps: respectively preparing graphene oxide aqueous solutions with a mass volume concentration of 1 mg / mL and a mass volume concentration of 10 mg / mL mL of silicon dioxide dispersion and a boric acid aqueous solution with a mass volume concentration of 1 mg / mL, wherein, in the silicon dioxide dispersion, the diameter of silicon dioxide is 10 nm; the above-mentioned graphene oxide aqueous solution, silicon dioxide dispersion, boric acid The aqueous solution was mixed according to the volume ratio of 1:1:1, ultrasonically dispersed to obtain a uniform suspension, and then spray-dried, fed by a peristaltic pump, the feeding speed was 1mL / min, the inlet temperature was 250°C, and the outlet temperature was 110°C, collect the above-mentioned spray-dried product, put it in a tube furnace under the protecti...

Embodiment 3

[0031]A preparation method of the selenium-heteroatom-doped graphene hollow sphere composite cathode material proposed by the present invention comprises the following steps: respectively preparing graphene oxide aqueous solutions with a mass volume concentration of 1 mg / mL, and a mass volume concentration of 1 mg / mL mL of silicon dioxide dispersion and a phosphoric acid aqueous solution with a mass volume concentration of 1 mg / mL, wherein, in the silicon dioxide dispersion, the diameter of silicon dioxide is 500 nm; the above-mentioned graphene oxide aqueous solution, silicon dioxide dispersion, phosphoric acid The aqueous solution is mixed according to the volume ratio of 1:1:1, and the suspension is obtained by ultrasonic dispersion; the suspension is spray-dried, fed by a peristaltic pump, the feeding speed is 10mL / min, the inlet temperature is 150°C, and the outlet The material temperature was 110°C, and the spray-dried product was collected, placed in a tube furnace prote...

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Abstract

The invention discloses a selenium-heteroatom doped graphene hollow sphere composite positive electrode material. The selenium-heteroatom doped graphene hollow sphere composite positive electrode material is obtained by compounding heteroatom doped graphene hollow spheres and selenium, wherein in the heteroatom doped graphene hollow spheres, heteroatoms are one or more of nitrogen atoms, boron atoms and phosphorus atoms. The invention further provides a preparation method of the selenium-heteroatom doped graphene hollow sphere composite positive electrode material. The preparation method comprises the following steps: preparing an aqueous graphene oxide solution, a silicon dioxide dispersion and an aqueous heteroatom precursor solution; mixing the prepared aqueous graphene oxide solution,the prepared silicon dioxide dispersion and the prepared aqueous heteroatom precursor solution, then uniformly dispersing to obtain a suspension; performing spray drying on the suspension, then sintering in an inert gas, discharging, then soaking in an aqueous hydrofluoric acid solution, washing, and drying to obtain the heteroatom doped graphene hollow spheres; mixing the heteroatom doped graphene hollow spheres with the selenium, then performing ball milling, then sintering in the inert gas, and discharging.

Description

technical field [0001] The invention relates to the technical field of lithium-selenium batteries, in particular to a selenium-heteroatom-doped graphene hollow sphere composite positive electrode material and a preparation method thereof. Background technique [0002] With the continuous advancement of science and technology and the rapid development of electronic products, people urgently need high-energy density, environmentally friendly battery systems. Lithium-sulfur batteries and lithium-selenium batteries are due to their high energy density (mass energy density of lithium-sulfur batteries is 2600Wh / kg , lithium-selenium battery volumetric energy density 3253mAh / cm 3 ) gradually come into the field of vision of researchers. Compared with lithium-sulfur batteries, the electronic conductivity and electrochemical activity of selenium cathode materials are higher than those of sulfur cathodes, so they have high application prospects. However, similar to sulfur, selenium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M10/052Y02E60/10
Inventor 王辉刘会郭军坡谢李生
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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