Elemental sulfur composite material containing graphene and preparation method thereof

A composite material and elemental sulfur technology, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of complex preparation process and uneven compounding, and achieve the effect of simple synthesis method and adjustable and controllable material shape

Inactive Publication Date: 2012-06-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A recent paper reported the synthesis method of graphene-sulfur composites (Hailiang Wang, Yuan Yang, Yi Cui, and Hongjie Dai. Nano Letters 2011, 11, 2644-2647; Jiazhao Wang, Lin Lu, Xun Xu, Huakun Liu. Journal of Power Sources 2011, 196, 7030-7034), compared with elemental sulfur, the cycle performance has been improved to a certain extent, but there are also many shortcomings such as complicated preparation process and uneven compounding, which need to be improved and improved

Method used

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  • Elemental sulfur composite material containing graphene and preparation method thereof
  • Elemental sulfur composite material containing graphene and preparation method thereof
  • Elemental sulfur composite material containing graphene and preparation method thereof

Examples

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Embodiment 1

[0030] This embodiment provides a graphene-containing elemental sulfur composite material, which is a binary composite material A x B y , wherein, A is graphene, B is elemental sulfur, and B is uniformly dispersed on the surface of A in a nanometer state, wherein, 1%≤x≤90%, 10%≤y≤99%, and x+y=100%.

[0031] The following examples are examples of the preparation method of the graphene-containing elemental sulfur composite material provided in Example 1.

Embodiment 2

[0033] This embodiment provides a method for preparing the graphene-containing elemental sulfur composite material provided in Example 1, comprising the following steps:

[0034] Step 1, adding graphene oxide into deionized water to obtain a graphene oxide dispersion; specifically, adding 1 mass part of graphene oxide to 1 mass part of deionized water to obtain a graphene oxide dispersion;

[0035] Step 2, adding elemental sulfur to obtain a mixture slurry of graphene oxide and elemental sulfur; specifically, adding 1 mass part of elemental sulfur to obtain a mixture slurry of graphene oxide and elemental sulfur;

[0036] Step 3, after heat-treating the mixture slurry, washing and filtering with water to obtain a graphene-containing elemental sulfur composite material; specifically, heat-treating the mixture slurry in a polytetrafluoroethylene sealed tank at 200°C for 24 hours, washing and filtering with water to obtain a graphene-containing elemental sulfur composite material;...

Embodiment 3

[0038] Embodiment 3 is a variation example of embodiment 2, specifically:

[0039] Step 1, adding 1 mass part of graphene oxide into 10 mass parts of deionized water to obtain a dispersion of graphene oxide;

[0040] Step 2, adding 3 parts by mass of elemental sulfur to obtain a mixture slurry of graphene oxide and elemental sulfur;

[0041] Step 3, after heat-treating the mixture slurry in a polytetrafluoroethylene sealed tank at 155°C for 48 hours, washing and filtering with water to obtain a graphene-containing elemental sulfur composite material, wherein the mass content of graphene is 20%, and the mass content of elemental sulfur is 80% %.

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Abstract

The invention provides an elemental sulfur composite material containing graphene and a preparation method of the composite material. The composite material is a binary material AxBy, wherein A is grapheme, and B is elemental sulfur, x is more than or equal to 1 percent and less than or equal to 90 percent while y is more than or equal to 10 percent and less than or equal to 99, and x plus y equals to 100 percent, and B is dispersed on the surface of A in a nanometer state. The preparation method comprises the steps of carrying out hydro-thermal treatment on the elemental sulfur and the graphene oxide between 50 and 500 degrees; and reducing the graphene oxide into the graphene by the elemental sulfur, and obtaining the elemental sulfur composite material containing grapheme of which nano-sulfur is uniformly dispersed on the surface of the grapheme at the same time. Lithium sulfur batteries or sodium sulfur batteries are prepared by using the composite material as an anode and a metal lithium or metal sodium as a cathode; moreover, the lithium sulfur batteries can be charged or discharged under the room temperature, and the reversibility specific capacity of the sulfur-based composite material containing grapheme is up to 1480mAh / g.

Description

technical field [0001] The invention relates to a positive electrode material for a secondary battery and a preparation method thereof, in particular to an elemental sulfur composite positive electrode material for a secondary battery and a preparation method thereof. Background technique [0002] With the increasing global energy shortage and the deterioration of environmental climate, people's demand for clean energy is becoming more and more urgent. Batteries, as energy storage and conversion devices, play an irreplaceable role in the process of clean energy utilization. Compared with other commonly used secondary batteries, lithium-ion batteries have attracted extensive attention because of their high mass-specific energy and volume-specific energy. Low cost, high energy density, high safety, long cycle life, and green secondary batteries are the hotspots in the development of next-generation lithium batteries. [0003] The current commercial positive electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王久林尹利超贾灏杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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