High-energy-storage composite phase change material for low temperature and preparation method thereof
By leveraging the synergistic effect of the glycylglycine system and inorganic particles, the problems of energy storage density and supercooling in traditional low-temperature phase change materials have been solved, enabling efficient low-temperature cold storage and cold chain transportation applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI SECOND POLYTECHNIC UNIVERSITY
- Filing Date
- 2026-04-16
- Publication Date
- 2026-06-30
AI Technical Summary
Traditional low-temperature phase change materials suffer from problems such as limited energy storage density, large supercooling, poor cycle stability, and easy phase separation, which limit their performance and long-term reliability in demanding cold storage scenarios.
The glycylglycine system is used as a high-energy-storage matrix. Organic sugar alcohols are combined to adjust the phase transition temperature, and inorganic particles are introduced as nucleating agents to provide heterogeneous nucleation sites, reduce the nucleation energy barrier, and suppress supercooling.
A phase change material with high energy storage density (above 230 J/g) and low supercooling has been developed, which is suitable for low-temperature cold storage and cold chain transportation, and improves the nucleation efficiency and heat transfer efficiency of the material.
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Figure FT_1
Abstract
Description
Technical Field
[0001] This invention belongs to the field of phase change energy storage technology, specifically relating to a high-energy-storage composite phase change material for low-temperature applications and its preparation method. Background Technology
[0002] In the field of refrigeration and energy storage, low-temperature phase change cold storage materials have been widely used in scenarios such as cold chain transportation because they can absorb or release a large amount of latent heat during the phase change process.
[0003] Traditional low-temperature phase change materials mostly use inorganic salt hydrate systems with water as the solvent. Although these materials have high specific heat capacity and suitable phase change temperature, they still face problems such as limited energy storage density, large supercooling, poor cycle stability and easy phase separation in practical applications, which seriously restrict their performance and long-term reliability in high-requirement cold storage scenarios.
[0004] To address the existing shortcomings, comprehensive optimization at the material system level is urgently needed: on the one hand, by introducing high-energy-storage carriers as structural substrates and combining them with organic components, precise control of phase transition temperature can be achieved; on the other hand, by using inorganic particle modification technology, heterogeneous nucleation sites can be constructed in the system to reduce the nucleation energy barrier and effectively suppress supercooling.
[0005] Based on this, the present invention aims to develop a high-energy-storage composite phase change material for low-temperature applications and its preparation method, which can meet the high cold storage requirements in the range of 0℃ to −6℃, and the energy storage density can reach more than 230 J / g, showing good application prospects. Summary of the Invention
[0006] This invention proposes a high-energy-storage composite phase change material for low-temperature applications and its preparation method. By constructing a glycylglycine system and introducing temperature-regulating materials and inorganic particles, it achieves the effect of controllable phase change temperature range and improved latent heat capacity. It is suitable for high-performance phase change materials in scenarios such as low-temperature cold storage, cold chain transportation, and temperature control systems.
[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a high-energy-storage composite phase change material for low-temperature applications and its preparation method.
[0008] This composite phase change material is composed of a high-energy-storage matrix, a temperature-regulating material, nanoparticles, and a solvent.
[0009] Among them, the high energy storage matrix adopts the glycyl glycine system, which has a high latent heat energy storage capacity; the temperature control material adjusts the phase change temperature of the composite phase change material through organic sugar alcohol, so that its range is between 0 and -6℃; the nucleating agent is selected from inorganic particles, which provide a large number of heterogeneous nucleation sites with their high specific surface area, reduce the nucleation energy barrier, enhance the heat transfer efficiency of the system, and thus effectively suppress the supercooling phenomenon.
[0010] A high-energy-storage composite phase change material for low-temperature applications and its preparation method, comprising the following steps: The preparation process consists of two steps: First, glycylglycine high-energy storage matrix, temperature control material and water are mixed in proportion and stirred until uniform to form a composite phase change solution; then, inorganic particles are added to it and stirred continuously to disperse it evenly, and finally a composite phase change cold storage system is obtained.
[0011] Beneficial effects: This invention utilizes the synergistic effect of high energy storage matrix, temperature control material and nanoparticles to significantly reduce material supercooling and enhance latent heat capacity of phase change.
[0012] Compared with traditional phase change materials, this invention has advantages such as high nucleation efficiency, strong cold storage performance, and wide application adaptability, and has important application value in the fields of high-efficiency low-temperature cold storage and temperature control technology. Attached Figure Description
[0013] Figure 1 Schematic diagram of nano-modification In the figure, 1 represents the glycylglycine and organic sugar alcohol matrix, 2 represents the inorganic nucleating particles, and 3 represents the solvent environment. Detailed Implementation
[0014] The invention will now be further explained with reference to the accompanying drawings.
[0015] like Figure 1 As shown, this invention relates to a high-energy-storage composite phase change material for low-temperature applications and its preparation method. The composite phase change material is composed of a high-energy-storage matrix, a temperature-regulating material, inorganic particles, and a solvent.
[0016] The high-energy-storage matrix is composed of a glycylglycine system, with an energy storage density of over 230 J / g.
[0017] During the cooling process, the present invention provides heterogeneous nucleation sites for crystallization by uniformly dispersing inorganic particles in the composite matrix.
[0018] The high specific surface area of these particles significantly reduces the difficulty of nucleation, allowing the material to trigger crystallization at higher temperatures without having to be cooled to lower temperatures as in traditional salt solutions.
[0019] The present invention will be further described below through specific embodiments.
[0020] The present invention can be better understood from the following embodiments.
[0021] The following examples illustrate a carbon nanoparticle-enhanced glycylglycine composite phase change material. Carbon nanoparticles have excellent heterogeneous nucleation capabilities and can provide stable nucleation sites during the phase change process, thereby reducing the supercooling of the system. Glycylglycine serves as the main energy storage substance, providing the latent heat of phase change, while organic sugar alcohols are used to regulate the phase change temperature range.
[0022] By combining these components with carbon nanoparticles to construct a composite system, a composite phase change cold storage material with low supercooling and high latent heat capacity can be formed.
[0023] Example 1: 4g glycylglycine and 0.54g sorbitol were mixed and dissolved in deionized water until completely dissolved to obtain a mixed solution as a precursor. The mixed solution was then added to carbon nanoparticles and dispersed under ultrasonic conditions for 10 minutes. This process allowed the carbon nanoparticles to be uniformly dispersed, and their high surface energy was used to form dense potential nucleation sites, ultimately resulting in a uniformly dispersed composite solution.
[0024] Differential scanning calorimetry (DSC) was used to measure the DSC of a mixed solution of carbon nanotubes with a volume concentration of 0.4 wt%. The latent heat of phase change was 262.2 J / g, the phase change temperature was -5.2℃, and the supercooling was 17.4℃.
[0025] Compared to the control sample without nano-carbon mixed solution, the supercooling of the carbon-free sample was approximately 18.7°C.
[0026] It is evident that carbon nanoparticles effectively play a role in nucleation regulation.
[0027] Example 2: 4g of glycylglycine and 0.54g of glycerol powder were mixed and dissolved in deionized water until completely dissolved to obtain a mixed solution as a precursor. The mixed solution was then added to carbon nanoparticles and dispersed under ultrasonic conditions for 10 minutes. This process allowed the carbon nanoparticles to be uniformly dispersed, and their high surface energy was used to form dense potential nucleation sites to obtain a uniformly dispersed composite solution.
[0028] Differential scanning calorimetry (DSC) was used to measure the DSC of a mixed solution of nano-carbon with a volume concentration of 0.4 wt%. The latent heat of phase change was 254.1 J / g, the phase change temperature was -7.2℃, and the supercooling was 11.4℃.
[0029] Example 3: 4g glycylglycine and 0.54g sorbitol were mixed and dissolved in deionized water until completely dissolved to obtain a mixed solution as a precursor. The mixed solution was added to carbon nanoparticles and dispersed under ultrasonic conditions for 10 minutes. This process allowed the carbon nanoparticles to be uniformly dispersed and their high surface energy to form dense potential nucleation sites.
[0030] Differential scanning calorimetry (DSC) was used to measure the DSC of a mixed solution of nano-carbon with a volume concentration of 1 wt%. The latent heat of phase change was 261.6 J / g, the phase change temperature was -7.4℃, and the supercooling was 15.9℃.
[0031] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A high-energy-storage composite phase change material for low-temperature applications and its preparation method, characterized in that: It is composed of a high-energy-storage matrix, temperature-controlled materials, inorganic particles and solvents.
2. The composite phase change material according to claim 1, characterized in that: The high-energy-storage matrix is a glycylglycine system with an energy storage density higher than 230 J / g.
3. The composite phase change material according to claim 1, characterized in that: The temperature control material uses organic sugar alcohol to adjust the phase transition temperature of the composite phase change material, so that its phase transition temperature is within the range of 0 to -6℃.
4. The composite phase change material according to claim 1, characterized in that: The high specific surface area of the inorganic particles gives them a large number of nucleation sites, thereby reducing the nucleation energy barrier and improving the heat transfer of the system, ultimately achieving a supercooling of no more than 3°C.
5. The composite phase change material according to claim 1, characterized in that: The solvent is water, in which the energy storage material and the temperature control material have good solubility.
6. A high-energy-storage composite phase change material for low-temperature applications and its preparation method, characterized by its simplified experimental steps: The preparation process consists of two steps: First, glycylglycine high-energy storage matrix, temperature control material and water are mixed in proportion and stirred until uniform to form a composite phase change solution; then, inorganic particles are added to it and stirred continuously to disperse it evenly, and finally a composite phase change cold storage system is obtained.