Organic composite electrode material, preparation method thereof and photo-assisted charging ammonium ion battery

Abstract

The invention discloses an organic composite electrode material, a preparation method thereof and a photo-assisted charging ammonium ion battery. The organic composite electrode material is obtained by compounding 2, 6-di [1-(pyrene-3, 4, 9, 10-tetraformyl diimine)] anthraquinone and reduced graphene oxide, and the organic composite electrode material is prepared by compounding the 2, 6-di [1-(pyrene-3, 4, 9, 10-tetraformyl diimine)] anthraquinone and the reduced graphene oxide. According to the invention, the photo-assisted charging strategy and the aqueous ion battery are combined, the ammonium ions are used as the charge carrier of the aqueous photo-assisted charging battery for the first time by virtue of the rapid dynamic characteristic of the ammonium ions in the aqueous electrolyte, and the advantages of rapid ion transmission of the ammonium ions in the electrolyte are utilized; the problem that the photoelectric reaction rate and the electrochemical oxidation reduction rate in the aqueous photo-assisted rechargeable battery are not matched is solved, collaborative optimization of the photoelectric reaction rate and the electrochemical reaction rate is achieved, the charging and discharging efficiency and the energy utilization rate of the battery are remarkably improved, and a new thought is provided for the next generation of photo-storage integrated battery technology.

Description

Technical Field

[0001] This invention relates to the field of aqueous photo-assisted charging ion battery technology, and particularly to an organic composite electrode material, its preparation method, and a photo-assisted charging ammonium ion battery. Background Technology

[0002] Currently, vigorously developing clean and efficient renewable energy has become one of the key areas of technological research and development in the energy sector. Among these, achieving efficient utilization of solar energy is crucial for renewable energy development. However, the intermittent nature of solar energy storage systems is a critical technical problem that needs to be addressed in their development and application. Traditional solar energy storage systems employ solutions combining photovoltaic modules, charge / discharge controllers, and batteries, but in practical applications, they suffer from limitations such as large system size, limited energy conversion efficiency, high operating power consumption, and high initial investment costs. These inherent technical bottlenecks have constrained the large-scale application of solar energy storage technology. Therefore, developing a new type of device that is smaller and more efficient is a current research focus in the solar energy and energy storage fields.

[0003] In recent years, photovoltaic-assisted rechargeable ion batteries have emerged as a promising technology due to their dual functions of light absorption and energy storage, enabling integrated energy conversion and storage. This reduces device size and allows for more flexible applications across various fields. Among these, aqueous photovoltaic-assisted rechargeable ion batteries hold significant potential for wearable devices and large-scale energy storage due to their inherent high safety and low cost. However, existing aqueous photovoltaic-assisted rechargeable ion batteries typically use zinc ions as charge carriers. The slow diffusion rate of zinc ions leads to a mismatch between the photoelectric reaction rate and the electrochemical redox rate, thus reducing the utilization rate of light energy.

[0004] Therefore, there is an urgent need to propose a new aqueous photochargeable ion battery to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an organic composite electrode material, its preparation method, and a light-assisted charging ammonium-ion battery, thereby solving the technical problem of low light energy utilization caused by the mismatch between the rapid photoelectric reaction and the slow electrochemical redox reaction in the existing aqueous light-assisted charging battery.

[0006] In a first aspect, the present invention provides an organic composite electrode material, which is obtained by combining 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone with reduced graphene oxide; wherein, the structural formula of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone is as follows: .

[0007] Secondly, the present invention provides a method for preparing an organic composite electrode material, comprising the following steps: Provides 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone and reduced graphene oxide; 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone and reduced graphene oxide were mixed evenly to obtain an organic composite electrode material.

[0008] Thirdly, the present invention provides a light-assisted charging ammonium-ion battery, comprising: a positive electrode, a negative electrode, a separator, and an electrolyte; wherein the positive electrode comprises a positive electrode active material, which is the organic composite electrode material provided in the first aspect of the present invention; the negative electrode is a zinc metal electrode; and the electrolyte is an ammonium sulfate solution.

[0009] Compared with the prior art, the beneficial effects of the present invention include: This invention combines a light-assisted charging strategy with an aqueous ion battery. By leveraging the rapid kinetics of ammonium ions in an aqueous electrolyte, it proposes for the first time to use ammonium ions as the charge carrier in an aqueous light-assisted charging battery. By utilizing the advantage of ammonium ions' rapid ion transport in the electrolyte, it solves the problem of mismatch between the photoelectric reaction rate and the electrochemical redox rate in aqueous light-assisted charging batteries. This achieves synergistic optimization of the photoelectric reaction rate and the electrochemical reaction rate, significantly improving the battery's charge and discharge efficiency and energy utilization, and providing a new approach for next-generation integrated photovoltaic and energy storage battery technology. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of one embodiment of the light-assisted charging ammonium-ion battery provided by the present invention; Figure 2 Here is a SEM image of the organic composite electrode material (AQ-diPTCDI@rGO) prepared in Example 1 of this invention; Figure 3 This is a stability diagram of the organic composite electrode material (AQ-diPTCDI@rGO) and AQ-diPTCDI prepared in the electrolyte according to Example 1 of the present invention; Figure 4 The constant current charge-discharge curves of the coin cell prepared in Example 2 of this invention under light and dark conditions in the voltage range of 0~1.8 V (current density is 0.2 A / g, the dark curve is the test result after 48 dark cycles, and the light curve is the test result after 48 dark cycles + 2 light cycles). Figure 5 This is a rate performance diagram of the coin cell prepared in Example 2 of the present invention under different current densities in the voltage range of 0~1.8 V under light and dark conditions; Figure 6This is a cycle diagram of the coin cell prepared in Example 2 of the present invention under illumination conditions in the voltage range of 0~1.8 V (current density of 2 A / g, 800 cycles). Figure 7 This is a photoresponse current curve of the coin cell prepared in Example 2 of the present invention under the condition of no external current. Figure 8 This is a graph showing the self-charging and dark discharge curves of the soft-pack battery prepared in Example 3 of the present invention under light illumination (discharge current density is 0.1 A / g). Figure 9 This is a rate performance graph of the coin cell prepared in Comparative Example 1 of the present invention under different current densities in the voltage range of 0~1.8 V under light and dark conditions. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0012] In a first aspect, the present invention provides an organic composite electrode material, which is obtained by combining 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone (AQ-diPTCDI) with reduced graphene oxide. The structural formula of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone is as follows: .

[0013] This invention anchors 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone (AQ-diPTCDI) to reduced graphene oxide (rGO) through π-π interactions, forming an AQ-diPTCDI@rGO composite material, which enhances electronic conductivity and structural stability.

[0014] In this embodiment, the mass ratio of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone to reduced graphene oxide is 1:(0.05~0.1). If the proportion of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone is too low, it will lead to a decrease in the load of battery active materials, thereby reducing the energy density per unit volume; if the proportion of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone is too high, it will lead to a decrease in the utilization rate of battery active materials, and the materials cannot react fully, resulting in a decrease in battery specific capacity.

[0015] Secondly, the present invention provides a method for preparing an organic composite electrode material, comprising the following steps: S1 provides 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone (AQ-diPTCDI) and reduced graphene oxide (rGO); S2. Mix 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone (AQ-diPTCDI) and reduced graphene oxide evenly to obtain organic composite electrode material (AQ-diPTCDI@rGO).

[0016] In this embodiment, 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone was prepared according to the literature method.

[0017] In this embodiment, reduced graphene oxide is synthesized via ascorbic acid reduction, and the specific steps are as follows: The graphene oxide dispersion and ascorbic acid were mixed and reacted to obtain a reduced graphene oxide dispersion.

[0018] The concentration of the graphene oxide dispersion is 0.5-2 mg / ml.

[0019] The mass ratio of graphene oxide to ascorbic acid is 1:(0.3~0.4).

[0020] The mixing reaction temperature is 90~100℃, and the mixing reaction time is 30~90min.

[0021] In this embodiment, step S2 includes: dispersing 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone in sulfuric acid solution, then adding reduced graphene oxide, allowing the reaction to stand, and then centrifuging and drying to obtain an organic composite electrode material.

[0022] The concentration of the sulfuric acid solution is 10~30 mg / ml.

[0023] The mass ratio of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone to sulfuric acid is 1:(50~100).

[0024] In this method, 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone was dispersed in sulfuric acid solution by ultrasonic dispersion for 30-90 min.

[0025] The temperature for the static reaction is room temperature (generally 20~30℃), and the reaction time is 20~40 minutes.

[0026] Please see Figure 1Thirdly, the present invention provides a light-assisted charging ammonium-ion battery, comprising: a positive electrode, a negative electrode, a separator, and an electrolyte; wherein the positive electrode comprises a positive electrode active material, which is the organic composite electrode material provided in the first aspect of the present invention; the negative electrode is a zinc metal electrode; and the electrolyte is an ammonium sulfate solution.

[0027] Compared to traditional aqueous zinc-ion batteries, this invention uses ammonium sulfate solution as the electrolyte. It leverages the faster redox kinetics of ammonium ions in the electrolyte compared to zinc ions, thus solving the mismatch between the rapid recombination of photogenerated electrons and holes and the slow redox kinetics in photovoltaic batteries. Using a metallic zinc electrode as the negative electrode reduces battery manufacturing costs and increases operating voltage.

[0028] In this embodiment, the positive electrode is prepared by the following steps: mixing organic composite electrode material, binder and solvent to form a mixed slurry, which is then coated on the surface of the positive electrode current collector and dried to obtain the positive electrode.

[0029] The binder is polyvinylidene fluoride (PVDF).

[0030] The solvent is N-methylpyrrolidone (NMP).

[0031] The mass ratio of organic composite electrode material to binder is 1:(0.1~0.5), and more specifically 1:(0.1~0.2).

[0032] The mass ratio of the adhesive to the solvent is 1:(20~30), or more specifically 1:(20~25).

[0033] The positive electrode current collector is at least one of carbon paper, carbon cloth, and titanium mesh.

[0034] In this embodiment, the concentration of the ammonium sulfate solution is 0.5-2 mol / L, preferably 1 mol / L.

[0035] In this embodiment, the diaphragm is a glass fiber diaphragm.

[0036] This invention does not limit the specific type of light-assisted charging ammonium-ion battery; those skilled in the art can select according to the actual situation, such as pouch cells, button cells, etc. To improve adaptability, this invention can also modify the battery as needed.

[0037] In some specific embodiments of the present invention, the light-assisted charging ammonium-ion battery further includes: a positive electrode shell, on which an opening is provided, and a light-transmitting material is encapsulated at the opening; and a metal foil ring is provided between the positive electrode and the positive electrode shell, the metal foil ring corresponding to the opening. The positive electrode shell (such as a CR2032 coin cell battery) is made of a non-light-transmitting material. Since it is not a light-transmitting material, by providing an opening in the middle of the positive electrode shell and encapsulating the opening with a light-transmitting material, the battery is kept sealed, and a light window can be provided to the positive electrode side; by providing a metal foil ring between the positive electrode and the positive electrode shell, conductivity can be increased and the light-receiving area can be avoided. More specifically, the diameter of the opening in the middle of the positive electrode shell is 8 mm, the transparent material is PVC with a diameter of 10 mm, and the metal foil ring is a concentric titanium foil ring with an outer diameter of 18 mm and an inner diameter of 8 mm.

[0038] In some specific embodiments of the present invention, the light-assisted charging ammonium-ion battery further includes: a positive electrode shell, wherein the positive electrode shell is made of a light-transmitting material. The positive electrode shell (such as a pouch battery) is made of a light-transmitting material, and the positive and negative electrodes are led out through a titanium mesh or the like as tabs. Therefore, no other improvement strategies are required, and existing pouch batteries can be directly used.

[0039] To avoid redundancy, the external light source used in the tests of this invention is a solar simulator with an intensity of one standard sun (110 mW / cm²). 2 ).

[0040] Example 1 (1) AQ-diPTCDI was prepared according to the literature method (Molecular Regulation on Carbonyl-Based Organic Cathodes: Toward High-Rate and Long-Lifespan Potassium-Organic Batteries, ACS Appl. Mater. Interfaces 2021, 13, 16396−16406).

[0041] (2) 70 ml of GO aqueous solution (1 mg / ml) was mixed with 25 mg of ascorbic acid and stirred at 95 °C for 60 minutes to obtain rGO suspension. GO was prepared by a modified Hummers method.

[0042] (3) Prepare 100 ml of sulfuric acid solution with a concentration of 20 mg / ml, add 25 mg of AQ-diPTCDI to the sulfuric acid solution, sonicate for 60 minutes, and then add rGO suspension according to the mass ratio of AQ-diPTCDI to rGO of 85:5. Through the π-π interaction between the two materials, AQ-diPTCDI self-assembles and anchors on rGO. After standing for 30 minutes, take the precipitate and centrifuge it. After centrifugation three times, dry it in an oven at a constant temperature of 80 ℃ for 6 hours to obtain AQ-diPTCDI@rGO composite material.

[0043] Please see Figure 2 ,pass Figure 2 It can be seen that the thin film of rGO is coated on the surface of the AQ-diPTCD material.

[0044] Please see Figure 3 ,pass Figure 3 It can be seen that after soaking in 1 mol / L ammonium sulfate solution at room temperature for 30 min, although the AQ-diPTCDI material itself has a certain stability and is not easily soluble in the electrolyte, the AQ-diPTCDI@rGO composite material system is clearer, indicating that the AQ-diPTCDI@rGO composite material of the present invention has better stability than AQ-diPTCDI.

[0045] Example 2 This embodiment provides a light-assisted charging ammonium-ion coin cell, the preparation process of which is as follows: The AQ-diPTCDI@rGO composite material (mass ratio 85:5), PVDF (polyvinylidene fluoride), and NMP (N-methylpyrrolidone) prepared in Example 1 were mixed in a mass ratio of 9:1:20 to form a slurry. After stirring for 3 hours, the slurry was uniformly dripped onto carbon paper with a diameter of 10 mm. The slurry was then dried in a vacuum oven at 80 °C for 10 hours to obtain electrode sheets (each sheet containing approximately 1.2 mg of active material). Pure zinc sheets were used as the counter electrode (circular sheets with a diameter of 12 mm and a thickness of approximately 1 mm). The separator was a glass fiber separator, model Glass fiber GF / F. Ammonium sulfate containing 1 mol / L was used as the electrolyte. A 10 mm diameter transparent PVC material was used to encapsulate the positive electrode shell with an 8 mm opening in the center (providing a window for the battery to receive light). A 18 mm outer diameter, 8 mm inner diameter, and 0.01 mm thick electrode was also used. A concentric titanium foil ring, each mm in diameter, was placed between the positive electrode and the positive electrode shell to increase conductivity, assembling an experimental coin cell, model CR2032. The electrochemical performance of the cell was tested using a blue electrode testing system. The photoresponse current was measured using a 4200SCS semiconductor analysis system.

[0046] Please see Figure 4 ,pass Figure 4 It can be seen that the charge / discharge specific capacity reaches 110 mAh / g under both current density (0.2 A / g) and illumination conditions, representing a 19.6% increase compared to the specific capacity under no-light conditions. Furthermore, through... Figure 4 It can be seen that the voltage range of the coin cell is 0-1.8 V. According to the theoretical specific capacity calculation formula, each AQ-diPTCDI molecule undergoes intercalation / deintercalation with 3-5 ammonium ions, and the theoretical specific capacity is between 112 mAh / g and 140 mAh / g. Due to the effect of light, the intercalation / deintercalation of approximately 0.7 ammonium ions is increased.

[0047] Please see Figure 5 ,pass Figure 5 It can be seen that after charge-discharge cycles of 0.1 A / g + 0.2 A / g + 0.5 A / g + 1 A / g, the battery capacity can still reach about 62 mAh / g under current density of 2 A / g and light conditions, indicating that the AQ-diPTCDI@rGO composite material prepared in Example 1 of this invention has excellent rate performance as a positive electrode material.

[0048] Please see Figure 6 ,pass Figure 6 It can be seen that under a current density of 2 A / g and illumination conditions, its initial charge specific capacity can reach 75 mAh / g, and its specific capacity can be stabilized at around 46 mAh / g after 800 cycles, with a capacity retention rate of 61.5%. This indicates that the AQ-diPTCDI@rGO composite material prepared in Example 1 of this invention has high specific capacity and good cycle performance as a positive electrode material under high current density.

[0049] Please see Figure 7 ,pass Figure 7 It can be seen that under 60 seconds of illumination, the battery generated an average of 35.83 μA / cm. 2 The response current (the ratio of the vertical axis to the illuminated area) indicates that the battery can generate photocurrent for self-charging only under illumination, without any external current.

[0050] Further integration Figure 5 and Figure 6 It can be seen that the AQ-diPTCDI@rGO composite material prepared in Example 1 of this invention, used as an electrode material, is used to assemble a light-assisted charging ammonium-ion battery. It not only has excellent rate performance, but also excellent long-cycle performance under high current. Furthermore, the performance comparison between light and dark shows that the battery performance is greatly improved under light, demonstrating the superior performance and future prospects of light-assisted charging batteries.

[0051] Example 3 This embodiment provides a light-assisted charging ammonium-ion soft-pack battery, the preparation process of which is as follows: The AQ-diPTCDI@rGO composite material (mass ratio 85:5) prepared in Example 1, PVDF (polyvinylidene fluoride), and NMP (N-methylpyrrolidone) were mixed in a mass ratio of 9:1:20 to prepare a slurry. The prepared slurry was then uniformly coated onto the surface of a 3×3 cm carbon cloth, and the prepared carbon cloth (with an active material loading of 1 mg / cm²) was then applied. 2 The battery was dried in a vacuum oven at 80 ℃ for more than 10 hours. A zinc sheet (approximately 3.5×3.5cm, 1mm thick square sheet) was used as the negative electrode. A 4×4cm glass fiber diaphragm (Glass fiber GF / F) was used as the separator. 200-mesh titanium mesh cut to 1×3cm was used as the tabs, and a 7×7cm, 1mm thick PVC plastic flexible sheet was used as the outer shell for encapsulation. The electrolyte used in this invention was 1 mol / L ammonium sulfate electrolyte, assembled into an experimental soft-pack battery. Battery performance was tested using a Blue Electric testing system, with a test voltage range of 0~1.8 V.

[0052] Please see Figure 8 ,pass Figure 8 It can be seen that the battery prepared in Example 3, under standard sunlight intensity and without external current, can self-charge to approximately 0.7 V after 2400 seconds of charging. Under no light, it can discharge for 3000 seconds at a current density of 0.1 A / g, achieving a discharge specific capacity of 83.7 mAh / g. This demonstrates that the photo-assisted charging ammonium-ion battery of this invention not only possesses excellent cycle life but also good photo-charging capability. Furthermore, its ability to self-charge to 0.7 V under pure light and without external current charging, while exhibiting a high discharge specific capacity, provides a direction for the future development of photo-rechargeable batteries.

[0053] Comparative Example 1 Compared with Example 2, the only difference is that the electrolyte is replaced with a 2 mol / L zinc sulfate solution.

[0054] Please see Figure 5 and 9 ,pass Figure 5 and 9 It can be seen that, compared with traditional aqueous zinc-ion batteries, this invention, by using ammonium sulfate solution as the electrolyte, significantly improves the battery capacity at different current densities, and at the same current density, Figure 5 The increased capacity of ammonium-ion batteries under light irradiation indicates that the faster ion transport of the water-based light-assisted charging ammonium-ion battery of the present invention improves the utilization rate of photogenerated charge generated by light irradiation, that is, improves the utilization rate of light energy.

[0055] In summary, compared with the prior art, the beneficial effects of the present invention include: (1) The present invention enhances the electronic conductivity and structural stability by anchoring 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone to reduced graphene oxide to form an organic composite electrode material.

[0056] (2) This invention uses an aqueous electrolyte to improve battery safety and reduce costs. It also introduces ammonium ions as charge carriers for the first time in a photo-assisted charging battery system. The faster ion transport rate of ammonium ions helps to alleviate the mismatch between the photogenerated charge carrier rate and the slower ion diffusion rate, thereby improving the utilization efficiency of photogenerated electrons and holes and increasing the battery capacity under illumination.

[0057] (3) The present invention adopts light-assisted charging technology and utilizes photoelectric synergy mechanism to solve the continuity problem of traditional photovoltaic devices, and improves the energy density of the battery by external charging and discharging.

[0058] (4) By realizing the integration of light absorption and storage, the present invention simplifies the design of integrated light and storage and is suitable for portable devices.

[0059] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An organic composite electrode material, characterized in that, The organic composite electrode material is obtained by combining 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone with reduced graphene oxide; wherein, the structural formula of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone is as follows: 。 2. The organic composite electrode material according to claim 1, characterized in that, The mass ratio of the 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone to the reduced graphene oxide is 1:(0.05~0.1).

3. A method for preparing the organic composite electrode material according to any one of claims 1 to 2, characterized in that, Includes the following steps: Provides 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone and reduced graphene oxide; The 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone and the reduced graphene oxide were mixed evenly to obtain an organic composite electrode material.

4. The method for preparing the organic composite electrode material according to claim 3, characterized in that, The steps for obtaining an organic composite electrode material by uniformly mixing 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone and reduced graphene oxide include: dispersing 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone in a sulfuric acid solution, then adding reduced graphene oxide, allowing the reaction to stand, and then centrifuging and drying to obtain the organic composite electrode material.

5. The method for preparing the organic composite electrode material according to claim 4, characterized in that, The concentration of the sulfuric acid solution is 10~30 mg / ml; the mass ratio of 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone to sulfuric acid is 1:(50~100).

6. The method for preparing the organic composite electrode material according to claim 4, characterized in that, 2,6-bis[1-(pyrene-3,4,9,10-tetracarboxydiimide)]anthraquinone was dispersed in sulfuric acid solution by ultrasonic dispersion for 30-90 min; the static reaction was carried out at room temperature for 20-40 min.

7. A light-assisted charging ammonium-ion battery, characterized in that, include: Positive electrode, negative electrode, separator, and electrolyte; among which, The positive electrode includes a positive electrode active material, which is the organic composite electrode material according to any one of claims 1 to 2; The negative electrode is a zinc metal electrode; The electrolyte is an ammonium sulfate solution.

8. The photo-assisted charging ammonium-ion battery according to claim 7, characterized in that, The positive electrode is prepared by the following steps: mixing organic composite electrode material, binder, and solvent to form a slurry, then coating it onto the surface of the positive electrode current collector, and drying it to obtain the positive electrode; wherein... The adhesive is polyvinylidene fluoride; The solvent is N-methylpyrrolidone; The mass ratio of the organic composite electrode material to the binder is 1:(0.1~0.5). The mass ratio of the adhesive to the solvent is 1:(20~30); The positive electrode current collector is at least one of carbon paper, carbon cloth, and titanium mesh.

9. The photo-assisted charging ammonium-ion battery according to claim 7, characterized in that, The concentration of the ammonium sulfate solution is 0.5-2 mol / L; the diaphragm is a glass fiber diaphragm.

10. The photo-assisted charging ammonium-ion battery according to claim 7, characterized in that, The light-assisted charging ammonium ion battery further includes: a positive electrode shell, on which an opening is provided, and a light-transmitting material is encapsulated at the opening; A metal foil ring is provided between the positive electrode and the positive electrode shell, and the metal foil ring is provided in correspondence with the opening.

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