Preparation method for cathode material of lithium-sulfur battery
A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problem of limited contribution of fixed polysulfides, to improve product quality and production efficiency , fast and accurate positioning effect
Active Publication Date: 2019-02-05
北京石墨烯技术研究院有限公司
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However, the carbon material itself is a non-polar material, and its contribution to the fixation of polysulfides is limited.
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Embodiment 1
[0025] A method for preparing a graphene / carbon nanotube@Mn3O4@S composite material, comprising the following steps:
[0026] Step 1. Disperse 10 mg of graphene / carbon nanotube hybrid material in 40 ml of deionized water, and ultrasonically disperse for 30 minutes to obtain a graphene / carbon nanotube dispersion with a concentration of 0.25 mg / ml;
[0027] Step 2. Dissolve 200mg of potassium permanganate and 0.14ml (concentration 37%) of hydrochloric acid in the dispersion of step 1, and reduce the magnetic force by half for 30 minutes;
[0028] Step 3, put the dispersion liquid into the reaction kettle, and conduct a hydrothermal reaction at 200°C for 2 hours;
[0029] Step 4. After repeated cleaning with absolute ethanol by vacuum filtration, put the graphene / carbon nanotube@Mn3O4 re-checking material into a vacuum drying oven for drying at a drying temperature of 80°C and a drying time of 24 hours;
[0030] Step 5, the composite material is roasted at 400° C. for 3 hours un...
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Abstract
The invention relates to a preparation method for a cathode material of a lithium-sulfur battery. The method comprises the following steps that firstly, a graphene / carbon nano tube mixture is dispersed into deionized water in an ultrasonic oscillation mode; and then potassium permanganate and hydrochloric acid are added into a dispersion, hydrothermal reaction is carried out, manganous-manganic oxide nanosheets are uniformly attached to the surfaces of graphene / carbon nano tubes, and finally, sulfur nano-particles are uniformly distributed on the surface of a graphene / carbon nano tube@Mn3O4 composite material through a fusion diffusion method so as to obtain a graphene / carbon nano tube@Mn3O4@S composite material. The composite material serving as the cathode material of the lithium-sulfurbattery has the advantages of huge specific surface area, a porous structure and high conductivity, the composite material is applied to the lithium-sulfur battery, so that the rate performance of thecathode material can be remarkably improved, and the problem that capacity attenuation in the electrode reaction process is too fast can be effectively solved. The method has the advantages of beingsimple, feasible and very suitable for engineering production.
Description
technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material, in particular to a preparation method of a graphene / carbon nanotube@Mn3O4@S composite material. Background technique [0002] The theoretical specific energy of lithium-sulfur batteries is 2600WhKg-1, which is five times that of the current theoretical specific energy of lithium-ion batteries (500WhKg-1), and is recognized as the most promising lithium secondary battery for the next generation. It is expected to be widely used in portable electronic products, electric vehicles, aerospace vehicles, and power grid transmission. It plays a huge role in the development of today's society, economy, and technology, and has a very bright application prospect. [0003] However, at room temperature, the conductivity of elemental sulfur is low, and soluble polysulfides are generated during the charging and discharging process of lithium-sulfur batteries, causing various s...
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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王楠燕绍九王晨南文争王继贤
Owner 北京石墨烯技术研究院有限公司