A kind of zinc manganate/milk carbon composite and preparation method thereof
Technical field
The present invention relates to belong to field of material technology, and in particular to a kind of zinc manganate/milk carbon composite and its preparation
Method.
Background technique
Zinc manganate is a kind of transition group metallic oxide with spinel structure, belongs to tetragonal crystal system, and physics, chemistry
Property is stablized, cheap, environmental-friendly.Simultaneously as a kind of important inorganic functional semiconductor material, in biomedical, gas
Before there are important researching value and application in the fields such as quick element, catalyst, solar battery, fuel cell and information material
Scape.Carbon material has many advantages, such as that cheap, pollution-free, good electric conductivity and physicochemical properties are stablized.Zinc manganate with
Carbon material recombination energy improves the conductivity of material, stability, and electrochemistry capacitance etc. can enhance it as lithium ion battery, super
The performance of the electrode materials such as capacitor.And graphene is as a kind of carbon material, preparation method is complicated and is not easy to be made.
The preparation method of existing zinc manganate and graphene composite material, as publication number 104934590A " a kind of zinc manganate/
The patent of the preparation method of graphene composite material " is uniformly mixed simultaneously with graphite oxide aqueous solution and manganese salt and zinc salt solution
Hydro-thermal reaction is carried out, zinc manganate and graphene composite material are generated.The main problem of this method is needed first with Hummers
Method synthesizes graphite oxide, and is configured to graphite oxide aqueous solution, and synthesis technology is cumbersome, complicated for operation.
Biomass carbon refers to one generated under anaerobic or anoxia condition by Pintsch process by the biomass rich in carbon
Kind carbon-rich solids substance.Under normal circumstances, the more substance of carbon will be contained, calcined under inert atmosphere such as argon gas, all
Available carbon material.Currently, the used biomass carbon source of researcher include sugarcane, peanut shell, rice shell, flesh of Pulp Citrulli,
Egg shell, pollen, milk, banana skin, grass juice factor etc..These biomass carbon sources are ubiquitous and cheap in life, mesh
It is preceding not yet by biomass carbon and the compound precedent of zinc manganate.
Just at present apparently, it is low to be easy to appear purity for zinc manganate milk carbon composite, and it is existing that preparation process is easy to appear reunion
As influencing its electric conductivity and stability, being also easy to collapsing for carbon structure occur, structural instability, pattern is poor, particle uniformity
Difference, overall distribution is not uniform enough, and specific surface area is smaller so that technical problems urgent need to resolve such as electric conductivity are not ideal enough.
Summary of the invention
The present invention first is designed to provide a kind of zinc manganate/milk carbon composite.
The present invention second is designed to provide a kind of preparation method of zinc manganate/milk carbon composite.
The object of the invention is achieved through the following technical solutions:
A kind of zinc manganate/milk carbon composite is by zinc manganate 75% ~ 80%, and it is quality hundred that milk carbon 20% ~ 25%, which forms,
Divide content.
Further, above-mentioned zinc manganate/milk carbon composite grain diameter is 25nm ~ 35nm.
A kind of preparation method of zinc manganate/milk carbon composite, which is characterized in that it is with zinc chloride, potassium permanganate
It is raw material with sodium fluoride, takes water as a solvent, through the zinc manganate precursor solution formed is mixed, then to mangaic acid zinc precursor
Plain chocolate is added in solution, through mixing, hydrothermal synthesis, separation of solid and liquid, centrifuge washing, drying and other steps, formed zinc manganate/
Milk carbon matrix precursor, finally, zinc manganate/milk carbon composite is made by a step high-temperature calcination.
Further, above-mentioned mixing is that zinc chloride, potassium permanganate, sodium fluoride and deionization is added in appropriate vessel
Water is mixed 20 ~ 30 minutes, under magnetic stirring, plain chocolate is added, and the magnetic agitation rotating speed is 200 ~ 300r/min,
Mixing time is 15 ~ 30 minutes, obtains mixed solution.
Further, the ratio between mole of above-mentioned zinc chloride, potassium permanganate, sodium fluoride be 0.6 ~ 0.8:1.2 ~ 1.6:1.2 ~
1.6, unit is mmol, and the molal volume ratio of the zinc chloride and deionized water is 0.6 ~ 0.8:60 ~ 80, unit mmol/ml,
The molal volume of the zinc chloride and plain chocolate ratio is 0.6 ~ 0.8:1.5 ~ 3, unit mmol/ml.
Further, above-mentioned hydro-thermal reaction be take mixed solution obtained above be placed in liner be polytetrafluoroethylene (PTFE) hydro-thermal it is anti-
It answers in kettle, setting temperature is 180 ~ 200 DEG C, is carried out hydro-thermal reaction 20 ~ 24 hours.
Further, above-mentioned separation of solid and liquid and centrifuge washing are that the mixed liquor that will be cooled down after hydro-thermal reaction is placed in centrifuge
In, it is separated by solid-liquid separation, precipitating is collected after separation of solid and liquid, first deionized water centrifuge washing is added three times in precipitating, the precipitating
The volume ratio of quality and deionized water is 1:60 ~ 200, and washing terminates, and collects and merge precipitating, then with dehydrated alcohol centrifuge washing
Three times, the quality of the precipitating and the volume of dehydrated alcohol are 1:60 ~ 200, collect and merge precipitating, spare;The centrifugation turns
Speed is 11000r/min, and centrifugation time is 3 ~ 5min.
Further, above-mentioned drying is the precipitating for taking above-mentioned collection to merge, and is placed in drying box, dry 8 at 60 ~ 80 DEG C
~ 48 hours, zinc manganate/milk carbon matrix precursor is made.
Further, above-mentioned step high-temperature calcination is by zinc manganate obtained/milk carbon matrix precursor in air atmosphere 400 ~ 700
1 ~ 2h is calcined at DEG C to get zinc manganate/milk carbon composite.
The present invention have it is following the utility model has the advantages that
Zinc manganate of the invention/milk carbon composite purity is high, up to 99.3%, pattern is good, and particle uniformity is good, whole
It is evenly distributed, large specific surface area, conductivity height;The method of the present invention can be widely applied to prepare zinc manganate/milk carbon functional material,
Preparation process is not in agglomeration, and structural stability is not in that carbon structure collapses well, using mangaic acid prepared by the present invention
Zinc/milk carbon functional material, have it is simple and easy to get, it is low in cost, the advantages that good conductivity, can be widely applied to lithium-ion electric
The new energy devices such as pond, solar battery are equally applicable to the fields such as biomedicine, gas sensor, information material.
Detailed description of the invention
Fig. 1 is zinc manganate/milk carbon composite XRD diagram prepared by the embodiment of the present invention 1.
Fig. 2 is zinc manganate/milk carbon composite FESEM figure prepared by the embodiment of the present invention 1.
Fig. 3 is zinc manganate/milk carbon composite TEM figure prepared by the embodiment of the present invention 1.
Fig. 4 is zinc manganate/milk carbon composite cyclic curve figure prepared by the embodiment of the present invention 1.
Specific embodiment
The present invention is specifically described below by embodiment, it is necessary to which indicated herein is that following embodiment is only used
In invention is further explained, it should not be understood as limiting the scope of the invention, person skilled in art can
To make some nonessential modifications and adaptations to the present invention according to aforementioned present invention content.
Embodiment 1
It weighs 0.8mmol zinc chloride, 1.6mmol potassium permanganate, 1.6mmol sodium fluoride to be dissolved in 80mL deionized water, mix
Stirring forms uniform solution, and after 30 minutes under violent magnetic agitation, 3mL plain chocolate is added, and continues stirring 30 minutes, system
Obtain finely dispersed mixed solution;It is subsequently moved in the hydrothermal reaction kettle that liner is polytetrafluoroethylene (PTFE), at a temperature of 200 DEG C, into
Row hydro-thermal reaction 24 hours, then three times by the mixed liquor deionized water and ethyl alcohol that are cooled down after hydro-thermal reaction difference centrifuge washing,
The precipitating for collecting each time, is placed in drying box, 24 hours dry at 60 DEG C, and zinc manganate/milk carbon matrix precursor is made;Most
Afterwards, presoma is placed in tube furnace, with the heating rate of 5 DEG C/min, and 500 DEG C of calcining 2h in air atmosphere, that is, it makes
Obtain zinc manganate/milk carbon composite.
Fig. 1 is that zinc manganate/milk carbon composite of this example preparation tests resulting XRD diagram through XRD diffractometer.From figure
In it is found that using the present invention prepared by sample XRD diagram it is consistent with standard zinc manganate card peak position, and principal character peak all with
The diffraction maximum of standard is coincide very well, and one or two of miscellaneous peak is only existed, therefore this product is with high purity, and purity may be up to 99.3%.
Fig. 2 is that zinc manganate/milk carbon composite of this example preparation shoots gained through field emission scanning electron microscope
SEM figure.It can be seen that zinc manganate/milk carbon nano-particle is of uniform size, average diameter is in 20 ~ 35nm.
Fig. 3 is that zinc manganate/milk carbon composite of this example preparation shoots resulting TEM through transmission electron microscope
Figure.It can be seen that milk derived carbon is wrapped in mangaic acid zinc nanoparticles, particle uniformity is good, and overall distribution is uniform, specific surface
Product is big.
Fig. 4 is that zinc manganate/milk carbon composite of this example preparation is bent as the circulation of lithium ion battery negative material
Line chart.It can be seen that first discharge specific capacity is 1285mAh/g, charge specific capacity 774mAh/g, coulombic efficiency is
60.26%;After circulation 100 times, specific discharge capacity 658mAh/g, charge specific capacity 648mAh/g, coulombic efficiency is
98.52%;After circulation 100 times, specific discharge capacity 994mAh/g, charge specific capacity 978mAh/g, coulombic efficiency is
98.37%.With the increase of cycle-index, zinc manganate/milk carbon negative pole material charging and discharging capacity is gradually reduced, until 50
Secondary circulation left and right, charging and discharging capacity start to grow steadily.Therefore, this preparation method improves the conductivity of composite material, ratio
Surface area and stability finally improve zinc manganate/milk carbon negative pole material chemical property.
Embodiment 2
It weighs 0.7mmol zinc chloride, 1.4mmol potassium permanganate, 1.4mmol sodium fluoride to be dissolved in 70mL deionized water, mix
Stirring forms uniform solution, and after 25 minutes under violent magnetic agitation, 2mL plain chocolate is added, and continues stirring 25 minutes, system
Obtain finely dispersed mixed solution;It is subsequently moved in the hydrothermal reaction kettle that liner is polytetrafluoroethylene (PTFE), at a temperature of 190 DEG C, into
Row hydro-thermal reaction 22 hours, then three times by the mixed liquor deionized water and ethyl alcohol that are cooled down after hydro-thermal reaction difference centrifuge washing,
The precipitating for collecting each time, is placed in drying box, 32 hours dry at 70 DEG C, and zinc manganate/milk carbon matrix precursor is made;Most
Afterwards, presoma is placed in tube furnace, with the heating rate of 5 DEG C/min, and 600 DEG C of calcining 1h in air atmosphere, that is, it makes
Obtain zinc manganate/milk carbon composite.
It is tested by the experimental method of embodiment 1, the experimental results showed that, this product purity is high, purity may be up to 99.3%,
Of uniform size, average diameter is in 20 ~ 35nm, and particle uniformity is good, and overall distribution is uniform, and large specific surface area, this preparation method mentions
The high conductivity of composite material, specific surface area and stability, finally improve zinc manganate/milk carbon negative pole material electrochemistry
Performance.
Embodiment 3
It weighs 0.6mmol zinc chloride, 1.2mmol potassium permanganate, 1.2mmol sodium fluoride to be dissolved in 60mL deionized water, mix
Stirring forms uniform solution, and after twenty minutes under violent magnetic agitation, 1.5mL plain chocolate is added, continues stirring 15 minutes,
Finely dispersed mixed solution is made;It is subsequently moved in the hydrothermal reaction kettle that liner is polytetrafluoroethylene (PTFE), at a temperature of 180 DEG C,
It carries out hydro-thermal reaction 20 hours, then the mixed liquor deionized water and ethyl alcohol that cool down after hydro-thermal reaction is distinguished into centrifuge washing three
It is secondary, each precipitating is collected, is placed in drying box, it is 15 hours dry at 60 DEG C, zinc manganate/milk carbon matrix precursor is made;
Finally, presoma is placed in tube furnace, with the heating rate of 5 DEG C/min, and 400 DEG C of calcining 2h in air atmosphere, i.e.,
Zinc manganate/milk carbon composite is made.
It is tested by the experimental method of embodiment 1, the experimental results showed that, this product purity is high, purity may be up to 99.0%,
Of uniform size, average diameter is in 20 ~ 35nm, and particle uniformity is good, and overall distribution is uniform, and large specific surface area, this preparation method mentions
The high conductivity of composite material, specific surface area and stability, finally improve zinc manganate/milk carbon negative pole material electrochemistry
Performance.