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A kind of positive electrode composite material of lithium battery and preparation method thereof

A technology of composite materials and lithium batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor electrochemical performance, low conductivity, and limitations of lithium-sulfur batteries

Active Publication Date: 2017-04-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, sulfur / hollow carbon sphere composites ( Synthesis of discrete and dispersible hollow carbon nanospheres with high uniformity by using confined nanospace pyrolysis ,Angew.Chem.Int.Ed.,2011,50,5904-5908.), sulfur / carbon nanotube composites ( Sulfur- Impregnated disordered carbon nanotubes cathode for lithium-sulfur batteries , Nano Letter, 2011, 11, 4288-4294.), sulfur / mesoporous sphere composites ( Spherical ordered mesoporous carbon nanoparticles with high porosity for lithium-sulfur batteries Angew.Chem.Int.Ed.2012,51,3591-3595), sulfur / graphene oxide composites ( Graphene oxide as a sulfur immobilizer in high performance lithium / sulfur cells .J.Am.Chem.Soc.2011,133,18522–18525.) and other carbon-sulfur composite materials, although the performance of lithium-sulfur batteries can be improved to a certain extent by preparing the above-mentioned composite materials, but due to the conductivity of sulfur itself low, still lead to poor electrochemical performance of lithium-sulfur batteries using the above-mentioned carbon-sulfur composite materials, thus greatly limiting its application

Method used

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  • A kind of positive electrode composite material of lithium battery and preparation method thereof
  • A kind of positive electrode composite material of lithium battery and preparation method thereof
  • A kind of positive electrode composite material of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]At 60°C, add 2.5 g of tellurium powder to 9.0 g of sodium polysulfide aqueous solution with a mass concentration of 30% to generate sodium thiotellurite solution; then add 0.08 g of surface active Polyethylene glycol octyl phenyl ether and 0.9g activated carbon, stirred for 2h, and after stirring evenly, the mixture was placed in an ultrasonic cleaner and ultrasonically oscillated at a power of 150W for 1h, and 3.6g was added to the solution with a mass concentration of 38 % dilute hydrochloric acid, and placed in a magnetic stirrer to stir, so that the tellurium sulfide generated by the decomposition of sodium thiotellurite is deposited in the pores of the carbon material to obtain a tellurium sulfide / carbon composite material, and then separated by filtration to obtain tellurium sulfide / carbon Composite material and filtrate: Wash the obtained tellurium sulfide / carbon composite material with distilled water until it is neutral, and then vacuum-dry it at 80°C to obtain a...

Embodiment 2

[0044] At 60°C, add 2.5g of tellurium powder to 9.0g of sodium polysulfide aqueous solution with a mass concentration of 30% to generate sodium thiotellurite solution; then add 0.22g of surface Activator polyethylene glycol and 2.0 g of activated carbon, stirred for 2 h, after stirring evenly, the mixture was placed in an ultrasonic cleaner and ultrasonically oscillated at a power of 100 W for 1 h, 3.6 g of dilute hydrochloric acid with a mass concentration of 38% was added to the solution, and Stirring in a magnetic stirrer, the tellurium sulfide produced by the decomposition of sodium thiotellurite is deposited in the pores of the carbon material to obtain the tellurium sulfide / carbon composite material, and then centrifuged to obtain the tellurium sulfide / carbon composite material and the filtrate; The obtained tellurium sulfide / carbon composite material was washed with ethanol until neutral, and then vacuum-dried at 70° C. to obtain the tellurium sulfide / carbon composite ma...

Embodiment 3

[0046] At 70°C, add 1.3g of tellurium powder to 6.7g of sodium polysulfide aqueous solution with a mass concentration of 30% to generate sodium thiotellurite solution; then add 0.12g of surface Active agent polyethylene glycol and 0.8g carbon black, stirred for 1h, after stirring evenly, the mixed solution was placed in an ultrasonic cleaner and ultrasonically oscillated for 1h with a power of 60W, and 2.33g of dilute sulfuric acid with a mass concentration of 60% was added to the solution, and placed in a magnetic stirrer to stir, so that the tellurium sulfide generated by the decomposition of sodium thiotellurite is deposited in the pores of the carbon material to obtain a tellurium sulfide / carbon composite material, which is separated by filtration to obtain a tellurium sulfide / carbon composite material and a filtrate; The tellurium sulfide / carbon composite material was washed with distilled water to neutrality, and then vacuum-dried at 80° C. to obtain a tellurium sulfide / c...

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Abstract

The invention discloses a lithium battery positive pole composite material and a preparation method thereof. The positive pole composite material refers to a tellurium sulfide / carbon composite material, wherein in the composite material, the content of tellurium sulfide is high and controllable, carbon and tellurium sulfide particles are very tightly combined, and according to the structural characteristics, the positive pole material is used for a lithium battery, the solution loss of an active material can be reduced, and a shuttle effect is inhibited, so that the lithium battery has high specific discharge capacity and good cycle performance. In addition, the lithium battery positive pole composite material disclosed by the invention is simple in preparation process, low in cost, short in period, low in energy consumption, high in repeatability and easy for large-scale production. Moreover, the content of the tellurium sulfide in the composite material is high and controllable, and according to the particularity of the preparation method, the impurity content in the obtained positive pole composite material is low.

Description

technical field [0001] The invention belongs to the field of preparation of positive poles of lithium batteries, and in particular relates to a composite material of positive poles of lithium batteries and a preparation method thereof. Background technique [0002] With the popularization of portable electronic products, the rapid development of energy storage technology and electric vehicles, there is an urgent need to develop batteries with higher energy density. It is predicted that the future 4G mobile communication requires the energy density of the battery to reach more than 500Wh / Kg. Due to the limited capacity improvement of cathode materials for lithium-ion batteries, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring safety problems. Changing the cathode material from the "deintercalation mechanism" to the "conversion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/362H01M4/5815Y02E60/10
Inventor 张治安杨幸蒋绍峰李劼赖延清
Owner CENT SOUTH UNIV