CN116751571A - Light absorption/heat storage co-strengthening Li 4 SiO 4 Base heat storage agent, preparation method and application thereof - Google Patents
Light absorption/heat storage co-strengthening Li 4 SiO 4 Base heat storage agent, preparation method and application thereof Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 80
- 239000011232 storage material Substances 0.000 title claims abstract description 59
- 229910004283 SiO 4 Inorganic materials 0.000 title claims abstract description 57
- 230000031700 light absorption Effects 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005728 strengthening Methods 0.000 title claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000004146 energy storage Methods 0.000 claims abstract description 22
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- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 15
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 229960002413 ferric citrate Drugs 0.000 claims description 12
- NPFOYSMITVOQOS-UHFFFAOYSA-K iron(III) citrate Chemical compound [Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NPFOYSMITVOQOS-UHFFFAOYSA-K 0.000 claims description 12
- 238000001354 calcination Methods 0.000 claims description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 10
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 10
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003837 high-temperature calcination Methods 0.000 claims description 3
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 claims description 3
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical group O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 6
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- YNQRWVCLAIUHHI-UHFFFAOYSA-L dilithium;oxalate Chemical compound [Li+].[Li+].[O-]C(=O)C([O-])=O YNQRWVCLAIUHHI-UHFFFAOYSA-L 0.000 description 10
- 239000008367 deionised water Substances 0.000 description 9
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- WTFUTSCZYYCBAY-SXBRIOAWSA-N 6-[(E)-C-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-N-hydroxycarbonimidoyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C/C(=N/O)/C1=CC2=C(NC(O2)=O)C=C1 WTFUTSCZYYCBAY-SXBRIOAWSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910010586 LiFeO 2 Inorganic materials 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
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- YTZVWGRNMGHDJE-UHFFFAOYSA-N tetralithium;silicate Chemical compound [Li+].[Li+].[Li+].[Li+].[O-][Si]([O-])([O-])[O-] YTZVWGRNMGHDJE-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Silicon Compounds (AREA)
Abstract
The invention discloses a light absorption/heat storage co-intensified Li 4 SiO 4 A base heat storage agent, a preparation method and application thereof. The method comprises the steps of carrying out wet mixing on different lithium sources, silicon sources and iron sources according to specific mixing, evaporating to dryness, and synthesizing Fe doped Li under high temperature condition 4 SiO 4 And (3) a base heat storage agent. The method has simple preparation process and simple and convenient operation, and the prepared Fe is doped with Li 4 SiO 4 The base heat storage agent maintains stable energy storage density in a plurality of circulating energy storage tests, the photo-thermal characteristics of the heat storage agent are more outstanding, the absorptivity of solar spectrum is maintained at a higher level, and a brand-new application foundation is provided for the industrial application of thermochemical energy storage.
Description
Technical Field
The invention belongs to the technical field of thermochemical heat storage agent preparation, and particularly relates to a light absorption/heat storage co-intensified Li 4 SiO 4 A base heat storage agent, a preparation method and application thereof.
Background
Solar energy is a renewable clean energy source with the largest natural reserves, receives wide attention of various countries at the moment of continuously rising energy demands, expands the industrial application range year by year, and gradually matures the industrial application technology.
The primary barrier currently limiting solar power generation technology is the interruption of solar radiation. In practical application, the solar power plant cannot meet the continuous power supply requirement due to the succession occurrence of non-sunny days and night, so that unbalance of energy supply and demand is formed, and the development of the solar power generation technology is restrained. In this regard, energy storage systems for solar power plants have been developed. The energy storage technology realizes uninterrupted thermal power generation of the solar power plant by storing solar radiation energy in a system in a specific form of energy and releasing the solar radiation energy in a form of heat energy at night or in overcast and rainy days.
The traditional heat storage agent materials (heat conduction oil, molten salt and the like) cannot meet the working temperature of a third-generation concentrating and heat collecting power generation (Concentrating Solar Powder, CSP) system up to 700 ℃, and in addition, the corrosiveness of the traditional heat storage materials further restricts the development of the traditional heat storage agent materials in the technical field of energy storage. Thermochemical energy storage (Thermochemical Energy Storage, TCES) is an energy storage technology suitable for long-period energy storage with less heat loss, and its principle is to realize cyclic storage/release of chemical energy and thermal energy by reversible chemical reaction of a heat storage material with a specific substance. The thermochemical energy storage materials commonly used at present mainly comprise metal oxides, salts, hydroxides and the like.
Lithium orthosilicate (Li) 4 SiO 4 ) Is characterized by high adsorption capacity (theoretically up to 0.367 g/g) and low regeneration energy consumption<750 ℃ and strong cycle stability CO 2 Adsorbent materials have received wide attention in the field of carbon capture in recent years. Based on Li 4 SiO 4 The thermochemical energy storage technology of the base material is that of Li 4 SiO 4 In a carbonization furnace with CO 2 The reaction releases heat to obtain the substance Li 2 CO 3 With Li 2 SiO 3 And stored in a specific material tank, and subsequently transferred to a calciner during the energy supply stage to realize Li 4 SiO 4 The regeneration is accompanied by heat storage. Li (Li) 4 SiO 4 /Li 2 CO 3 /Li 2 SiO 3 The materials are continuously circulated and fluidized among the carbonization furnace, the storage tank and the calciner in the circulating heat storage engineering so as to realize efficient and stable circulating heat storage/release. In addition, the heat of the solid phase material and the gas phase material is recovered by coupling a heat exchanger in the system, so that the overall efficiency of the system is improved. Pure Li 4 SiO 4 The powder is white, which limits Li to a great extent 4 SiO 4 Solar radiation absorbing capacity of the based heat storage agent, and in addition, unmodified and modified Li 4 SiO 4 The base thermal storage agent does not have strong industrial application suitability, and is particularly characterized by low energy storage density and high performance decay speed. Thus, for Li 4 SiO 4 The performance of the base heat storage agent is modified to improve the light absorption performance and the heat storage performance of the base heat storage agent, wherein Li is 4 SiO 4 The base heat storage agent is a necessary premise for practical application.
At present, li is about at home and abroad 4 SiO 4 The studies of the basic thermochemical heat storage agent mainly include: (1) Li (Li) 4 SiO 4 Research on the application potential of thermochemical energy storage of base materials (ApplEnergy 2017, 193, 74-83); (2) K (K) 2 CO 3 Additive strengthening Li 4 SiO 4 /CO 2 A reaction system (Energy Procedia 2017, 131, 94-100); (3) Li (Li) 4 SiO 4 /CO 2 Zeolite-based thermochemical heat storage systems research (ApplEnergy 2019, 240, 1-5). The above studies are mainly directed to macroscopic Li 4 SiO 4 Application potential research of the base thermochemical heat storage system is conducted on Li at present 4 SiO 4 Researches on modification methods of base thermochemical heat storage materials have been recently reported.
Disclosure of Invention
For Li 4 SiO 4 The invention aims at providing a light absorption/heat storage co-strengthening Li, which is a bottleneck encountered by a base material in thermochemical heat storage application 4 SiO 4 The invention discloses a base heat storage agent, a preparation method and application thereof, and the invention obtains dark color Li 4 SiO 4 A base thermochemical heat storage agent synthesized using a single step process; wet mixing different lithium sources, silicon sources and iron sources according to a certain proportion, evaporating to dryness, and synthesizing Fe doped Li under high temperature condition 4 SiO 4 A base heat storage agent; the Fe-doped heat storage agent has obviously improved heat storage performance and light absorption performance, and can be used in a solar heat reservoir. The technical scheme of the invention is specifically introduced as follows.
Light absorption/heat storage co-strengthening Li 4 SiO 4 The base heat storage agent is used as thermochemical energy storage material in the sunStress in energy collector
By doping Fe with Li 4 SiO 4 And (3) a base heat storage agent.
In the invention, light absorption/heat storage co-intensified Li 4 SiO 4 The base heat storage agent is prepared by the following steps:
(1) Weighing a certain amount of lithium source, silicon source and iron source, placing in a beaker, and adding a proper amount of solvent to fully disperse the materials to obtain a precursor solution;
(2) Placing the prepared precursor solution into a water bath kettle, and evaporating to dryness to obtain precursor powder;
(3) And (3) placing the precursor powder in a muffle furnace for high-temperature calcination, and grinding in a mortar to obtain the heat storage agent powder.
In the step (1), the lithium source, the silicon source and the iron source comprise two groups of lithium acetate, alkaline silica sol, ferric citrate, lithium carbonate, silicon dioxide and ferric oxide respectively; the solvent is water or absolute ethyl alcohol. Further preferably, in the step (1), lithium oxalate, 30wt% of alkaline silica sol and ferric citrate are selected and fully dissolved in deionized water to obtain a precursor solution; when lithium oxalate, ferric citrate and silica sol are used as precursors to prepare a heat storage agent, the precursors are dissolved in deionized water and uniformly mixed, so that the diffusion grade is molecular grade, and then the precursor solids which are uniformly dispersed can be obtained by evaporating the precursor solids, thereby being beneficial to the full reaction among the precursors.
In the step (1), the molar ratio of the lithium element in the lithium source, the silicon element in the silicon source and the iron element in the iron source is: (3.4-3.9): 1: (0.05-0.2). Further preferably, the molar ratio is 3.7:1:0.1.
In the step (2), the heating temperature is 85-95 ℃.
In the step (2), the calcination is performed in an air atmosphere, the calcination temperature is 800-950 ℃, and the calcination time is 240-360 min.
Li prepared by the synthetic route in the present invention 4 SiO 4 The base heat storage agent has the following advantages:
fe-doped Li obtained by the invention 4 SiO 4 Base heat storage agent pair full wavelength range 300nSolar spectrum of m-800nm
Has absorptivity, and average absorptivity of the total solar spectrum is compared with pure Li 4 SiO 4 The heat storage agent is obviously improved.
2. Fe-doped Li obtained by the invention 4 SiO 4 The base heat storage agent has the specific purity of Li under the condition of high light intensity and low light intensity 4 SiO 4 Faster ramp rates.
3. Fe-doped Li obtained by the invention 4 SiO 4 The base heat storage agent has excellent circulating energy storage stability, can be stabilized near 450kJ/kg, and has no steep performance attenuation phenomenon.
4. Fe-doped Li obtained by the invention 4 SiO 4 For the base heat storage agent<The light with the wavelength of 500nm has higher absorptivity, and the temperature of light absorption and heat storage can reach about 79.1 ℃.
Drawings
FIG. 1 shows the Fe-doped Li prepared in examples 1 and 2 4 SiO 4 X-ray diffraction pattern of the base thermal storage agent.
FIG. 2 shows the Fe-doped Li prepared in examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 4 SiO 4 Change in storage density of the base heat storage agent with cycle number (heat storage: 700 ℃ C./100% N) 2 20min; exothermic: 650 ℃/100% CO 2 20 min), wherein fig. 2a-2j correspond to example 1-example 10, respectively.
FIG. 3 is the Fe-doped Li prepared in example 3, example 5 and example 11 4 SiO 4 A near infrared-visible-ultraviolet absorbance performance test curve of the base thermal storage agent; wherein fig. 3a, 3b and 3c correspond to example 3, example 5 and example 11, respectively.
FIG. 4 is a Fe-doped Li prepared in example 3 and example 5 4 SiO 4 The base heat storage agent radiates (1618W/m) under intense illumination 2 ) A lower temperature rise curve; wherein fig. 4a, 4b correspond to example 3, example 5, respectively.
FIG. 5 is a Fe-doped Li prepared in example 3 and example 5 4 SiO 4 The base heat storage agent radiates (752W/m) in weak illumination 2 ) A lower temperature rise curve; wherein the method comprises the steps ofFig. 5a and 5b correspond to example 3 and example 5, respectively.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention provides a light/heat storage co-intensified Li 4 SiO 4 A synthetic pathway for a base thermal storage agent comprising the steps of:
(1) Weighing a specific amount of lithium source, silicon source and iron source, placing in a beaker, and adding a proper amount of deionized water to fully dissolve the lithium source, the silicon source and the iron source to obtain a precursor solution;
(2) Placing the prepared precursor solution into a water bath kettle, and evaporating to dryness to obtain precursor powder;
(3) Calcining the precursor powder at 800-950 ℃ for 240-360 min, and grinding in a mortar to obtain Fe doped Li 4 SiO 4 And (3) a base heat storage agent.
In the step (1), the lithium source, the silicon source and the iron source comprise two groups of lithium oxalate, 30wt% alkaline silica sol, ferric citrate, lithium carbonate, silicon dioxide and ferric oxide, and Li: molar ratio of fe= (3.4-3.9): 1: (0.05-0.2).
In the step (2), water bath heating at 85-95 ℃ is selected for evaporating.
In the step (3), the calcining atmosphere is an air atmosphere.
Example 1
(1) 8.67g of lithium oxalate (Li 2 C 2 O 4 Maclin reagent), 2.45g ferric citrate (FeC 6 H 5 O 7 Chinese medicine
Reagent) powder and 10g of alkaline silica sol (30 wt percent, shandong Usoxhlet chemical industry) are added into deionized water and stirred uniformly, so that the alkaline silica sol is fully dissolved;
(2) Placing the prepared solution into a water bath kettle, and evaporating to dryness to obtain precursor powder;
(3) Calcining the precursor powder at 850 ℃ for 300min to obtain Fe doped Li 4 SiO 4 And (3) a base heat storage agent.
Example 2
(1) 6.83g of lithium carbonate (Li 2 CO 3 Chinese medicinal preparation), 0.4g ferric oxide (Fe 2 O 3 Chinese medicine reagent
Powder and 3g of silicon dioxide (SiO 2 Chinese medicine reagent) is added into absolute ethyl alcohol and stirred uniformly;
(2) The obtained suspension is put into a water bath kettle to be evaporated to dryness to obtain precursor powder;
(3) Calcining the precursor powder at 850 ℃ for 300min to obtain Fe doped Li 4 SiO 4 And (3) a base heat storage agent.
The parameters of examples 3 to 7 are shown in Table 1, and parameters not shown in the tables are the same as those of example 1.
TABLE 1
| Examples | Lithium source/mass | Silicon source/mass | Iron source/mass | The mixed solution in the step (1) |
| Example 3 | Lithium oxalate 9.44g | Silica sol/10 g | Ferric citrate/1.23 g | Deionized water |
| Example 4 | Lithium oxalate 9.05g | Silica sol/10 g | Ferric citrate/1.84 g | Deionized water |
| Example 5 | Lithium carbonate/6.56 g | Silica/3 g | Ferric oxide/0.6 g | Absolute ethyl alcohol |
| Example 6 | Lithium carbonate/6.28 g | Silica/3 g | Ferric oxide/0.8 g | Absolute ethyl alcohol |
| Example 7 | Lithium oxalate/10.46 g | Silica sol/9 g | Ferric citrate/1.23 g | Deionized water |
| Example 8 | Lithium oxalate/10.71 g | Silica sol/8 g | Ferric citrate/2.45 g | Deionized water |
| Example 9 | Lithium carbonate/7.57 g | Silica/2.7 g | Ferric oxide/0.4 g | Absolute ethyl alcohol |
| Example 10 | Lithium carbonate/7.76 g | Silica/2.4 g | Ferric oxide/0.8 g | Absolute ethyl alcohol |
| Example 11 | Lithium oxalate | Silica sol | - | Deionized water |
Analysis of experimental results
Fe-doped Li prepared in examples 1, 2, 8, 9 by X-ray diffraction (XRD) 4 SiO 4 The analysis of the base heat storage agent shows that the results are shown in figure 1, and obvious Li can be observed 4 SiO 4 Diffraction peak and LiFeO 2 Diffraction peaks confirm effective doping of the Fe element.
Fe-doped Li prepared in examples 1-10 was tested by double temperature-controlled fixed bed reactor 4 SiO 4 The cyclic heat storage performance of the base heat storage agent under specific heat storage conditions. The heat storage working condition is as follows: the heat storage temperature is 700 ℃, the heat storage time is 20min, and the atmosphere is 100 vol.% of N 2 The method comprises the steps of carrying out a first treatment on the surface of the The exothermic conditions are as follows: exothermic temperature 650 ℃, holding time 20min, atmosphere of 100 vol.% CO 2 . The number of cycle tests is 10 or 15, and the CO adsorbed by each cycle is obtained through the poor quality of the adsorbent before and after each cycle 2 Mass and calculate the energy storage density by the heat of reaction (Δh= -94 kJ/kg)The change of the energy storage density with the increase of the cycle number is described by an image, and the result is shown in fig. 2a-2j, wherein the abscissa represents the cycle number of heat storage and heat release, and the ordinate represents the energy storage density. It can be seen that the storage densities of the heat storage agents (examples 1, 3, 4, 7, 8) prepared from lithium oxalate, silica sol and ferric citrate are overall higher than the storage densities of the heat storage agents (examples 2, 5, 7, 9, 10) prepared from lithium carbonate, silica and ferric oxide. Fe-doped Li prepared in example 3 4 SiO 4 The energy storage density of the base heat storage agent is highest and is basically maintained at 450kJ/kg. It is notable that the heat storage agent prepared by 10 examples has excellent circulating energy storage stability, and no abrupt performance decay phenomenon occurs.
Ultraviolet-visible-near infrared absorbance tests were performed on example 3, example 5 and example 11, and the test results are shown in fig. 3a, 3b and 3c, respectively. Wherein, the two samples of example 3 and example 5 show relatively similar absorbance change tendencies, specifically: peak value of absorbance around 300nm>50%) and then gradually decays with increasing wavelength, the absorbance increases again to about 350nm, and decays again after increasing to around 500nm, after which the decay continues. In contrast, embodiment 11 has too low absorptivity due to no doping with Fe element, specifically: for wavelength only<The 500nm optical radiation has a certain absorptivity, and the absorptivity gradually decays along with the increase of the wavelength value, and the highest absorptivity is only 5.1 percent. From this, fe doped with Li 4 SiO 4 Pure Li doped with base heat storage agent 4 SiO 4 Has stronger light absorption performance.
The high intensity lamp warm-up test (light source distance 17.5cm, power 1618W) was performed for examples 3 and 5, and the temperature change over time was as shown in fig. 4a and 4b, and it was observed that the temperature change rates of the two samples rose steeply and then slowly, the final temperature of the sample of example 3 was about 79.1 ℃ and the final temperature of the sample of example 5 was about 75.2 ℃.
The low intensity lamp warm-up test (light source distance 25cm, power 752W) was performed for examples 3 and 5, and the temperature change curves with time are shown in FIGS. 5a and 5b, in which the temperature change rates of the two samples were observed to be steep and then to be slow, the final temperature of the sample of example 3 was 69.4℃and the final temperature of the sample of example 5 was 63.6 ℃.
Claims (10)
1. Light absorption/heat storage co-strengthening Li 4 SiO 4 Application of base heat storage agent as thermochemical energy storage material in solar heat collector
For use, characterized in that it is Fe-doped with Li 4 SiO 4 And (3) a base heat storage agent.
2. The use according to claim 1, wherein the light-absorbing/heat-storing co-intensified Li 4 SiO 4 The base heat storage agent is prepared by the following steps
The preparation method comprises the following steps:
(1) Weighing a certain amount of lithium source, silicon source and iron source, placing in a beaker, and adding a proper amount of solvent to fully disperse the materials to obtain a precursor solution;
(2) Placing the prepared precursor solution into a water bath kettle, and evaporating to dryness to obtain precursor powder;
(3) And (3) placing the precursor powder in a muffle furnace for high-temperature calcination, and grinding in a mortar to obtain the heat storage agent powder.
3. The use according to claim 2, wherein in step (1) the lithium source, the silicon source and the iron source comprise two groups of lithium acetate, alkaline silica sol, ferric citrate and lithium carbonate, silica, ferric oxide, respectively.
4. The use according to claim 2, wherein in step (1) the solvent is water or absolute ethanol.
5. The use according to claim 2, wherein in step (1), the molar ratio of the lithium element in the lithium source, the silicon element in the silicon source and the iron element in the iron source is: (3.4-3.9): 1: (0.05-0.2).
6. The use according to claim 2, wherein in step (2) the heating temperature is 85 ℃ to 95 ℃.
7. The use according to claim 2, wherein in step (2), calcination is carried out in an air atmosphere at a calcination temperature of 800 ℃ to 950 ℃ for a calcination time of 240 min to 360min.
8. Light absorption/heat storage co-strengthening Li 4 SiO 4 The preparation method of the base heat storage agent is characterized by comprising the following steps:
(1) Weighing a certain amount of lithium source, silicon source and iron source, placing in a beaker, and adding a proper amount of solvent to fully disperse the materials to obtain a precursor solution;
(2) Placing the prepared precursor solution into a water bath kettle, and evaporating to dryness to obtain precursor powder;
(3) And (3) placing the precursor powder in a muffle furnace for high-temperature calcination, and grinding in a mortar to obtain the heat storage agent powder.
9. The light-absorbing/heat-storing co-intensified Li according to claim 8 4 SiO 4 The preparation method of the base heat storage agent is characterized in that in the step (1), the lithium source, the silicon source and the iron source comprise two groups, namely lithium acetate, alkaline silica sol, ferric citrate, lithium carbonate, silicon dioxide and ferric oxide.
10. The light-absorbing/heat-storing co-intensified Li according to claim 8 4 SiO 4 The preparation method of the base heat storage agent is characterized in that in the step (1), the molar ratio of lithium element in a lithium source, silicon element in a silicon source and iron element in an iron source is as follows: (3.4-3.9): 1: (0.05-0.2).
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