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Preparation method of solid electrolyte membrane coated FeS2/carbon positive electrode material

A technology of solid electrolyte membrane and carbon positive electrode, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of reduced volume change cycle performance, etc., and achieve high specific capacity, excellent charge-discharge cycle performance, and simple preparation process.

Inactive Publication Date: 2021-02-23
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above strategies are still difficult to solve the problem of the shuttling of polysulfides and the degradation of cycle performance caused by volume changes.

Method used

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  • Preparation method of solid electrolyte membrane coated FeS2/carbon positive electrode material
  • Preparation method of solid electrolyte membrane coated FeS2/carbon positive electrode material
  • Preparation method of solid electrolyte membrane coated FeS2/carbon positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0019] Polyvinylpyrrolidone and citric acid monohydrate are dissolved in deionized water and dehydrated ethanol solution according to the mass ratio of 1:8, after rapid stirring, then add ferric nitrate nonahydrate (the mass ratio of polyvinylpyrrolidone and ferric nitrate nonahydrate 1:13), and the precursor solution was obtained after rapid stirring. Then the precursor solution was sprayed in an ultrasonic nebulizer, and the mist was brought into a tube furnace with a temperature set at 500 °C through an argon flow, and then the collected samples were mixed with sulfur powder in a mass ratio of 1:3, and then heated in a tube furnace. Sulfurize in the furnace at 500°C for 4 hours, and FeS can be obtained after cooling 2 / carbon cathode material.

[0020] figure 1 Among them, (a1) is the precursor Fe 3 o 4 X-ray diffraction spectrum of carbon, which proves that the material is Fe with spinel structure 3 o 4 . Carbon is amorphous and therefore cannot be shown in X-ray d...

Embodiment 2

[0024] FeS 2 / Carbon cathode material, polyvinylidene fluoride and acetylene black are put into N-methyl-2-pyrrolidone according to the mass ratio of 70:15:15, and after stirring, the film is coated on the copper sheet and dried in vacuum. The sodium sheet is used as the counter electrode, and 1 mol / liter of NaTFSI is dissolved in the mixed electrolyte of dimethyl ether (dimethyl ether) and dioxolane (1.3-dioxolane) at a volume ratio of 1:1 as the electrolyte, which contains 1% NaNO 3 And 1% VC, and assembled into a battery. Such as image 3 As shown in (a), let the battery stand for 10 hours, discharge from the open circuit voltage to 0.8V (vs Na / Na + ), and then cycled three times between 0.8 and 0.01V at a current density of 0.1A / g, the FeS 2 / The surface of the carbon cathode material forms a solid electrolyte film, and then the battery is charged from 0.8V to 2.8V.

[0025] image 3 The galvanostatic charge-discharge cycle test in (b) shows that the solid electrolyt...

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Abstract

The invention relates to a preparation method of a solid electrolyte membrane coated FeS2 / carbon cathode material. The method comprises the following steps: dissolving polyvinylpyrrolidone, citric acid monohydrate and ferric nitrate nonahydrate serving as solutes in a certain amount of mixed solution of deionized water and absolute ethyl alcohol; spraying a precursor solution by adopting a spray cracking method to obtain Fe3O4 / carbon as a precursor, and then obtaining FeS2 / carbon by adopting a solid-phase vulcanization method; assembling FeS2 / carbon serving as a positive electrode material into a battery, carrying out low-current-density constant-current charging and discharging for a certain number of times in a low-voltage window, and forming a layer of solid electrolyte membrane on thesurface of FeS2 / carbon to obtain the solid electrolyte membrane coated FeS2 / carbon serving as the positive electrode material of a lithium ion battery and a sodium ion battery. The solid electrolyte membrane coated FeS2 / carbon prepared by the invention has the following advantages: 1, the solid electrolyte membrane coated FeS2 / carbon has excellent lithium storage performance and sodium storage performance; and 2, the preparation process is simple, convenient, efficient, low in cost, environment-friendly and capable of realizing large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a secondary battery electrode material. The invention belongs to the field of novel functional materials. Background technique [0002] In order to meet the increasing demand for high-performance secondary batteries such as electric vehicles, portable electronics, and grid energy storage, it is imperative to find electrode materials with high capacity, long cycle life, and high rate performance. Pyrite FeS 2 As a cathode material for lithium-ion and sodium-ion batteries, it has a specific capacity of 894mAh / g, is low in price and is environmentally friendly. FeS 2 It has been commercially used as a cathode material for non-rechargeable primary lithium batteries. In recent years, FeS 2 As anode materials for rechargeable secondary batteries, the research is more and more extensive. However, FeS 2 Elemental sulfur will be formed after the first intercalation and desorption of lithium / sodium, and the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 陈玉喜黄靖
Owner HUNAN UNIV
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