CN115044185B - Composite phase change material of carbon-based aerogel loaded modified polyethylene glycol for battery thermal management and preparation method and application thereof - Google Patents
Composite phase change material of carbon-based aerogel loaded modified polyethylene glycol for battery thermal management and preparation method and application thereof Download PDFInfo
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- 239000002202 Polyethylene glycol Substances 0.000 title claims abstract description 53
- 229920001223 polyethylene glycol Polymers 0.000 title claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000004964 aerogel Substances 0.000 title claims abstract description 46
- 239000012782 phase change material Substances 0.000 title claims abstract description 41
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 238000007726 management method Methods 0.000 title description 10
- 238000004108 freeze drying Methods 0.000 claims abstract description 16
- 150000001720 carbohydrates Chemical class 0.000 claims abstract description 14
- 238000005470 impregnation Methods 0.000 claims abstract description 13
- 239000002105 nanoparticle Substances 0.000 claims abstract description 13
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910021389 graphene Inorganic materials 0.000 claims description 26
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000017 hydrogel Substances 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 10
- 238000005338 heat storage Methods 0.000 abstract description 6
- 238000004146 energy storage Methods 0.000 abstract description 5
- 239000012744 reinforcing agent Substances 0.000 abstract description 3
- 239000011232 storage material Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 10
- 238000003756 stirring Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011068 loading method Methods 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- 238000002791 soaking Methods 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000012520 frozen sample Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000010413 sodium alginate Nutrition 0.000 description 2
- 239000000661 sodium alginate Substances 0.000 description 2
- 229940005550 sodium alginate Drugs 0.000 description 2
- PQLVXDKIJBQVDF-UHFFFAOYSA-N acetic acid;hydrate Chemical compound O.CC(O)=O PQLVXDKIJBQVDF-UHFFFAOYSA-N 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229940045110 chitosan Drugs 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to the field of battery thermal management and phase change energy storage materials, and particularly discloses a composite phase change material of carbon-based aerogel loaded modified polyethylene glycol, and a preparation method and application thereof. Establishing a three-dimensional network by utilizing saccharides to assist a carbon-based material through a freeze drying method, and preparing carbon-based aerogel; and modifying polyethylene glycol by adding nano particles serving as a heat conduction reinforcing agent, and preparing the composite phase change material by adopting a vacuum impregnation method. Compared with other similar technologies, the composite phase change material constructed by the method has good stability due to the cavity structure of the three-dimensional network, and the effective impregnation rate and the effective latent heat storage performance can be up to more than 87 percent; the carbon-based material has the characteristics of high heat conduction and high latent heat, and the nano particles are used as a heat conduction reinforcing agent, and meanwhile, a certain synergistic effect exists between the carbon-based material and the nano particles, so that the phase change material has the characteristics of high heat conduction and high latent heat, is not easy to leak, and has good application prospect in the aspect of battery heat management.
Description
Technical Field
The invention relates to the field of battery thermal management and phase change energy storage materials, in particular to a composite phase change material of carbon-based aerogel load modified polyethylene glycol for battery thermal management, and a preparation method and application thereof.
Background
The lithium battery with the greatest application in the electric automobile has the advantages of high energy density, long cycle life, low self-discharge rate, no pollution and the like, and is the secondary battery with the most promising and competitive application at present. However, the operating temperature of a lithium ion battery directly affects its safety and life. When the temperature is too high, the thermal runaway phenomenon is extremely easy to occur, smoke, fire and even explosion are caused, and the thermal runaway type energy storage and power battery is one of main potential safety hazards when the energy storage and power battery is used. The power generation capacity, service life and damage and severe environment resistance of the lithium ion battery directly influence the service life and endurance of the automobile. And the performance is very sensitive to the temperature, the optimal working temperature is 20-40 ℃, and the maximum temperature difference in the battery module is lower than 5 ℃. Excessive temperature accelerates the decomposition of the solid electrolyte phase interface film, causing thermal runaway hidden trouble; the low temperature can increase the viscosity of the electrolyte, affect the charge and discharge performance of the battery, and also can accelerate the lithium deposition reaction rate to form a lithium plating layer or lithium dendrite. In addition, the temperature gradient of the module is too large, which can cause the difference of discharge performance among the single batteries. The temperature in some areas is often lower or higher than this temperature, such as in northeast or south-east areas, and therefore efficient thermal management of the power cells of the vehicle is necessary to make the temperature distribution of the electric battery pack uniform and the operating temperature stable within a reasonable temperature interval. Meanwhile, the battery density is continuously developed to the direction of high energy density along with the social demand, and higher requirements are also put on a battery management system based on the phase-change energy storage material.
Compared with the active management technology, the phase change material does not need external energy driving, can absorb waste heat of the battery and realize battery preheating in a low-temperature environment, and has good development prospect. The phase change material is selected in consideration of the following aspects: firstly, the phase transition temperature range of the material should be within or near the ideal working range of the lithium ion battery; secondly, the material has high latent heat, small volume change and high cycle stability in the phase change process, and obvious supercooling and phase separation phenomena can not occur; in addition, the heat transfer should be accelerated while maintaining a high latent heat and having a high thermal conductivity.
Disclosure of Invention
The invention provides a carbon-based aerogel prepared by taking saccharides and a carbon-based material as raw materials through freeze drying, and finally preparing the carbon-based aerogel load modified polyethylene glycol composite phase-change material through immersing the phase-change material in vacuum.
The method for preparing the carbon-based aerogel supported modified polyethylene glycol composite phase-change material comprises the following steps:
(1) Mixing saccharides with water to form a hydrogel;
(2) Adding a carbon-based material into the hydrogel, and then preparing carbon-based aerogel by freeze drying;
(3) Dispersing the nano particles in an organic solvent uniformly, adding the nano particles into molten polyethylene glycol, and mixing uniformly to obtain modified polyethylene glycol;
(4) Mixing the modified polyethylene glycol in the step (3) with the aerogel prepared in the step (2), and then carrying out vacuum impregnation to prepare the carbon-based aerogel load modified polyethylene glycol composite phase change material.
Further, the saccharide in the step (1) is at least one of xanthan gum, chitosan, sodium alginate, hydroxymethyl cellulose and the like;
further, the mass fraction of the saccharides in the step (1) can be 3% -8%, so that aerogels with different porosities can be prepared;
further, step (1) mixing the saccharide with water by mechanical stirring to form a hydrogel, wherein the mechanical stirring speed is 1200r/min-1600r/min;
further, the carbon-based material in the step (2) may be at least one of nano graphene, graphene oxide, expanded graphite, carbon nanotube, and the like;
further, the mass fraction of the carbon-based material in the step (2) is 3% -15%;
further, the freeze-drying temperature in the step (2) is-10 ℃ to 20 ℃ and the freeze-drying time is 24h to 72h;
further, the content of the nano particles in the modified polyethylene glycol in the step (3) is 1wt% to 10wt%, preferably 1wt% to 5wt%, more preferably 1wt%, 2wt% and 3wt%. The polyethylene glycol may have a molecular weight of 700-6000.
Further, the nanoparticle in the step (3) may be at least one of nano aluminum nitride, nano aluminum oxide, nano zinc oxide, and the like;
further, the vacuum impregnation in the step (4) is completed in a vacuum oven, and the vacuum degree of the vacuum oven is-0.1 Mpa;
further, the time of vacuum impregnation in the step (4) is 1-2h, and the temperature is 65-85 ℃;
the finally prepared carbon-based aerogel loaded modified polyethylene glycol composite phase change material is a black block;
the composite phase change material of the carbon-based aerogel supported modified polyethylene glycol for battery thermal management is prepared by the method.
The application of the carbon-based aerogel load modified polyethylene glycol composite phase change material for battery thermal management in battery thermal management is provided.
According to the invention, saccharides and carbon-based materials are used as raw materials, carbon-based aerogel is prepared through freeze drying, and then modified polyethylene glycol is immersed into the carbon-based aerogel, so that the composite phase change material of carbon-based aerogel loaded modified polyethylene glycol is finally prepared. The carbon-based aerogel has a three-dimensional porous structure, so that the leakage problem of the phase change material in the phase change process can be effectively inhibited, and meanwhile, the nano particles are added to serve as a heat conduction reinforcing agent, so that the heat conductivity of the composite phase change material is further improved due to the synergistic effect between the nano particles and the carbon-based material; in the prepared composite phase change material, the phase change material has high loading rate and excellent shape stability, and simultaneously under the condition of keeping high latent heat, the heat transfer rate is accelerated by improving the heat conductivity coefficient.
Drawings
FIG. 1 is a differential scanning calorimetric curve of a graphene-based aerogel prepared in example 1 loaded with 1wt% of an aluminum nitride modified polyethylene glycol composite phase-change material;
fig. 2 is a sample diagram of the aluminum nitride modified polyethylene glycol composite phase-change material with the graphene-based aerogel prepared in example 1, example 4 and example 5, wherein the loading mass fraction of the aluminum nitride modified polyethylene glycol composite phase-change material is 1%, 2% and 3% respectively;
FIG. 3 shows the thermal conductivities of the final products obtained in example 1 and comparative examples 1 to 3.
Detailed Description
The following describes in detail the examples of the present invention, which are carried out on the premise of the technical solution of the present invention, and specific embodiments and specific operation procedures are given, but not limited to the present invention. The impregnation described in the examples is as is conventionally understood by those skilled in the art, i.e., immersing the aerogel in the solution. Thermal conductivity was measured by transient planar source method using (Hot Disk TPS2500, sweden), differential scanning calorimetry (TA. Q20, USA) at 5℃per minute at N 2 In an atmosphere. The polyethylene glycol used in the examples has a molecular weight of 2000; the molecular weights in the present invention are all average molecular weights.
Example 1
(1) 1.0g of chitosan with the molecular weight of 3000 is fully dissolved into 200mL of 0.3mol/L acetic acid water solution to obtain 0.5% saccharide solution, and the saccharide solution is mechanically stirred to be uniformly mixed to form hydrogel;
(2) Then dispersing the nano graphene into the solution (1), stirring for 30min at room temperature, and stirring for 2h to ensure that the nano graphene is uniformly dispersed, so as to obtain a nano graphene dispersion liquid with the mass fraction of 3%;
(3) Subpackaging the above solution, wherein about 25g of the solution is placed in a refrigerator for freezing for 24 hours;
(4) Placing the frozen sample in a freeze dryer, setting the freeze drying temperature to be-10-20 ℃ and the freeze drying time to be 48 hours, and obtaining the nano graphene aerogel after freeze drying;
(5) Dissolving nano aluminum nitride in ethanol solution, carrying out ultrasonic treatment for 40min, adding the solution into molten polyethylene glycol after the solution is uniformly dispersed, heating the solution in water bath at 85 ℃, and mechanically stirring the solution to uniformly mix the solution, wherein the mass fraction of the nano aluminum nitride in the obtained modified polyethylene glycol is 1%;
(6) Soaking the aerogel in the solution in the step (5), and placing the aerogel in a vacuum drying oven for soaking for 1.5 hours at the temperature of 75 ℃;
(7) And taking out the immersed sample, and cooling the sample to successfully prepare the graphene aerogel loaded aluminum nitride modified polyethylene glycol composite phase change material.
The graphene aerogel loaded aluminum nitride modified polyethylene glycol composite phase-change material is black and blocky and is relatively hard, wherein the loading capacity of polyethylene glycol can be up to 89.9%, and the differential scanning calorimetric curve is shown in figure 1; the latent heat of phase change can reach 176J/g, the heat conductivity coefficient can reach 0.69W/m.K, and the heat conductivity is obviously improved; meanwhile, the effective impregnation rate and the effective latent heat storage performance can reach 88.6 percent.
Example 2
(1) Fully dissolving 1.0g of sodium alginate with molecular weight of 222 into 200mL of deionized water solution to obtain 0.5% saccharide solution;
(2) Then dispersing the nano graphene into the solution (1), stirring for 30min at room temperature, and stirring for 2h to ensure that the nano graphene is uniformly dispersed, so as to obtain a nano graphene dispersion liquid with the mass fraction of 3%;
(3) Subpackaging the above solution, wherein about 25g of the solution is placed in a refrigerator for freezing for 24 hours;
(4) Placing the frozen sample in a freeze dryer, setting the freeze drying temperature to be-10-20 ℃ and the freeze drying time to be 48 hours, and obtaining the nano graphene aerogel after freeze drying;
(5) Adding nano zinc oxide into melted polyethylene glycol, heating in water bath at 85 ℃, mechanically stirring to uniformly mix the nano zinc oxide and the polyethylene glycol, wherein the mass fraction of nano aluminum nitride in the obtained modified polyethylene glycol is 1%.
(6) Soaking the aerogel in the solution in the step (5), and placing the aerogel in a vacuum drying oven for soaking for 1.5 hours at the temperature of 75 ℃;
(7) And taking out the immersed sample, and cooling the sample to successfully prepare the graphene aerogel loaded zinc oxide modified polyethylene glycol composite phase change material.
The graphene aerogel loaded zinc oxide modified polyethylene glycol composite phase-change material is black and blocky and is hard, wherein the loading capacity of polyethylene glycol can be up to 87.6%; the latent heat of phase change can reach 170J/g, the heat conductivity coefficient can reach 0.75W/m.K, and the heat conductivity is obviously improved; meanwhile, the effective impregnation rate and the effective latent heat storage performance can reach 86.8 percent.
Example 3
(1) 1.0g of hydroxymethyl cellulose with molecular weight of 240 is fully dissolved in 200mL of deionized water to obtain 0.5% saccharide solution;
(2) Then dispersing the nano graphene into the solution (1), stirring for 30min at room temperature, and stirring for 2h to ensure that the nano graphene is uniformly dispersed; obtaining nano graphene dispersion liquid with the mass fraction of 3%;
(3) Subpackaging the above solution, wherein about 25g of the solution is placed in a refrigerator for freezing for 24 hours;
(4) Placing the frozen sample in a freeze dryer, setting the freeze drying temperature to be-10-20 ℃ and the freeze drying time to be 48 hours, and obtaining the nano graphene aerogel after freeze drying;
(5) Adding nano aluminum oxide into melted polyethylene glycol, heating in water bath at 85 ℃, mechanically stirring to uniformly mix the mixture, wherein the mass fraction of nano aluminum nitride in the obtained modified polyethylene glycol is 1%.
(6) Soaking the aerogel in the solution in the step (5), and placing the aerogel in a vacuum drying oven for soaking for 1.5 hours at the temperature of 75 ℃;
(7) And taking out the immersed sample, and cooling the sample to successfully prepare the graphene aerogel loaded alumina modified polyethylene glycol composite phase change material.
The graphene aerogel loaded alumina modified polyethylene glycol composite phase-change material is black and blocky and is hard, wherein the loading capacity of polyethylene glycol can be up to 84.2%; the latent heat of phase change is up to 168J/g, the heat conductivity coefficient can be up to 0.74W/m.K, and the heat conductivity is obviously improved; meanwhile, the effective impregnation rate and the effective latent heat storage performance can reach 89.0 percent.
Example 4
Example 4 differs from example 1 in that the mass fraction of nano aluminum nitride added in step (5) is 2%.
The graphene aerogel loaded aluminum nitride modified polyethylene glycol composite phase-change material is black blocky, wherein the loading capacity of polyethylene glycol can be up to 87.3%; the latent heat of phase change can reach 161.8J/g, the heat conductivity coefficient can reach 0.60W/m.K, and the heat conductivity is obviously improved; meanwhile, the effective impregnation rate and the effective latent heat storage performance can reach 85.5 percent.
Example 5
Example 5 is different from example 1 in that the mass fraction of nano aluminum nitride added in step (5) is 3%.
The graphene aerogel loaded aluminum nitride modified polyethylene glycol composite phase-change material is black blocky, wherein the loading capacity of polyethylene glycol can be up to 85.7%; the latent heat of phase change can reach 160.28J/g, the heat conductivity coefficient can reach 0.57W/m.K, and the heat conductivity is obviously improved; meanwhile, the effective impregnation rate and the effective latent heat storage performance can reach 84.8 percent.
Comparative example 1
This comparative example is different from example 1 in that only polyethylene glycol phase change material (PEG) was prepared without adding human nanographene aerogel and nano aluminum nitride.
Comparative example 2
The comparative example is different from example 1 in that steps (1) to (4) and (6) are not included, namely, the aluminum nitride modified polyethylene glycol composite phase change material (PEG@AlN Foam) is prepared.
Comparative example 3
The comparative example is different from example 1 in that a graphene aerogel modified polyethylene glycol composite phase change material (peg@gnps Foam) was prepared without adding nano aluminum nitride.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Equivalent changes and modifications are intended to be included within the scope of the present invention, without departing from the spirit and scope thereof.
Claims (4)
1. The method for preparing the carbon-based aerogel load modified polyethylene glycol composite phase change material for battery thermal management is characterized by comprising the following steps:
(1) Mixing saccharides with water to form a hydrogel;
(2) Adding a carbon-based material into the hydrogel, and then preparing the carbon-based aerogel by freeze drying
Glue;
(3) Dispersing the nano particles in an organic solvent uniformly, adding the nano particles into molten polyethylene glycol, and mixing uniformly to obtain modified polyethylene glycol;
(4) Mixing the modified polyethylene glycol in the step (3) with the aerogel prepared in the step (2), and then carrying out vacuum impregnation to prepare a carbon-based aerogel-supported modified polyethylene glycol composite phase change material;
the saccharide in the step (1) is chitosan;
the mass fraction of the saccharides in the step (1) is 0.5%;
the carbon-based material in the step (2) is nano graphene;
the mass fraction of the carbon-based material in the step (2) is 3%;
the nano particles in the step (3) are nano aluminum nitride;
the content of the nano particles in the modified polyethylene glycol in the step (3) is 1 weight percent.
2. The method according to claim 1, characterized in that: the vacuum impregnation time in the step (4) is 1-2h, and the temperature is 65-85 ℃.
3. A composite phase change material of carbon-based aerogel supported modified polyethylene glycol for battery thermal management, prepared by the method of any one of claims 1.
4. The use of the carbon-based aerogel load-modified polyethylene glycol composite phase-change material for battery thermal management according to claim 3 in battery thermal management.
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