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Method for preparing porous manganese sulfide and graphene composite material

A composite material, graphene technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of poor cycle performance and rate performance, material volume collapse, capacity decay, etc., to improve rate performance, improve conductivity. efficiency and low cost

Inactive Publication Date: 2018-08-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when pure-phase transition metals are used as anode materials for lithium-ion batteries, the volume of the material will collapse and the structure will break during the process of lithium ion intercalation and extraction during charging and discharging, which will easily lead to capacity fading and poor cycle performance and rate performance.

Method used

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  • Method for preparing porous manganese sulfide and graphene composite material
  • Method for preparing porous manganese sulfide and graphene composite material
  • Method for preparing porous manganese sulfide and graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. The steps of preparing porous manganese sulfide and graphene composite material are as follows:

[0027] Measure 10 ml of graphene oxide (concentration: 10 mg / ml) into 150 ml of distilled water, and sonicate for 1 hour in an ultrasonic instrument with an ultrasonic power of 45W.

[0028] Then the 50% concentration manganese nitrate solution of weighing 3 g, 3 g L-cysteine, and 0.5 g urea are added in the above-mentioned graphite oxide solution respectively, and this mixed solution is placed on double-display constant temperature magnetic stirrer under magnetic force Stir for 0.5 h. Then the solution was transferred to a reaction kettle, placed in an oven and kept at 160°C for 24 hours.

[0029] After the reaction is finished, cool to room temperature, take out the reaction kettle and open it, wash it with water and ethanol three times respectively, then transfer the intermediate to a vacuum drying oven at 80 degrees for vacuum drying overnight, and then place the ob...

Embodiment 2

[0034] Measure 20 ml of graphene oxide (concentration: 10 mg / ml) into 200 ml of distilled water, and sonicate for 1 hour in an ultrasonic instrument with an ultrasonic power of 45W.

[0035] Then weigh the 50% concentration manganese nitrate solution of 3.58 g, 2.42 g L-cysteine, and 0.60 g urea are added in the above-mentioned graphite oxide solution respectively, and this mixed solution is placed on the double-display constant temperature magnetic stirrer under magnetic force Stir for 0.5 h. Then the solution was transferred to a reaction kettle, placed in an oven and kept at 160°C for 24 hours.

[0036] After the reaction is finished, cool to room temperature, take out the reaction kettle and open it, wash it with water and ethanol three times respectively, then transfer the intermediate to a vacuum drying oven at 80 degrees for vacuum drying overnight, and then place the obtained solid powder in a tube furnace , calcined at 500°C under nitrogen for 4 hours at a heating ra...

Embodiment 3

[0038] Measure 20 ml of graphene oxide (concentration: 5 mg / ml) into 100 ml of distilled water, and sonicate for 1 hour in an ultrasonic instrument with an ultrasonic power of 45 W.

[0039] Then weigh 3.62 g of 50% concentration of manganese nitrate solution, 2.62 g of thiourea, and 0.60 g of urea and add them to the above-mentioned graphite oxide solution respectively, and place the mixed solution on a dual-display constant temperature magnetic stirrer for 0.5 h under magnetic stirring. Then the solution was transferred to a reaction kettle, placed in an oven and kept at 160°C for 24 hours.

[0040] After the reaction is finished, cool to room temperature, take out the reaction kettle and open it, wash it with water and ethanol three times respectively, then transfer the intermediate to a vacuum drying oven at 80 degrees for vacuum drying overnight, and then place the obtained solid powder in a tube furnace , calcined at 300 degrees under nitrogen for 4 hours at a heating ra...

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Abstract

The invention relates to a porous manganese sulfide and graphene composite material used as a lithium battery negative electrode material, and a preparation method thereof. The method mainly comprisesthe following steps: forming a uniform mixed solution by using a suitable manganese source, a suitable sulfur source and graphene oxide, performing a reaction by using a hydrothermal technology, andperforming calcination to improve the crystallinity of the composite material in order to finally obtain the porous manganese sulfide and graphene composite material. The composite material prepared in the invention has a good electrical conductivity and a good structural stability, the surface of a manganese sulfide microsphere has a concave-convex structure, the internal of the manganese sulfidemicrosphere has a micro-porous structure, the micro-porous structure reduces the transmission path of lithium ions, and the concave-convex structure provides many sites and a large specific surface area to store the lithium ions and achieve sufficient contact with an electrolyte. The introduction of graphene provides a buffer space for the volume change in the charge and discharge process, so thecycle stability of the composite material is improved. The composite material prepared in the invention can be used for producing a lithium ion battery, and can improve the performances of the lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a porous manganese sulfide and graphene composite material used as a lithium battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Today, due to the depletion of global fossil fuel energy and increasingly prominent environmental pollution problems, such as: smog and water pollution, the urgency of developing a new generation of clean energy is becoming increasingly important. As a new generation of energy storage devices, rechargeable lithium-ion batteries have attracted increasing attention. Therefore, it is very important to develop low-cost, environmentally friendly, long-term stable cycle, high capacity and high rate electrode materials. Electrode materials play an important role in rechargeable lithium-ion batteries. As we all know, the negative electrode of commercial lithium-ion batteries is graph...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈志文胡志翔罗志刚李琦陈大勇
Owner SHANGHAI UNIV
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