High-capacity yarn type zinc ion battery and preparation method thereof

Abstract

The invention provides a high-capacity yarn type zinc ion battery and a preparation method thereof, and belongs to the technical field of ion batteries. Adding a conductive filler material as a conductive additive into the cellulose solution, adding metal salt to obtain a metal salt mixed spinning solution, and extruding and spinning to obtain a mixed positive electrode; adding zinc powder and a conductive filler material into the cellulose solution, extruding and spinning to form a mixed negative electrode; the positive electrode and the negative electrode are respectively dipped in a cellulose solution, interwoven together and put into electrolyte to be solidified into the yarn type battery. The method has the strategy that in-situ gelation of the fiber substrate and in-situ generation of the oxide active substance are synchronously carried out in the spinning process, and the in-situ formed active substance is in a nanometer size and has a very large specific surface area and relatively high electrochemical activity. The substrate material and the electrolyte of the electrode are natural biomass materials, can be biologically degraded, cannot pollute the environment, and have the characteristics of being green and environment-friendly.

Description

Technical Field

[0001] The present invention provides a high-capacity yarn-shaped zinc-ion battery and a preparation method thereof, belonging to the technical field of ion batteries. Background Art

[0002] Due to the characteristics of simple preparation, low cost, good safety, environmental friendliness, etc., aqueous zinc-ion batteries have received increasing attention in recent years and are considered to have broad application prospects in the field of wearable electronics.

[0003] Benefiting from their unique advantages and huge application prospects, aqueous zinc-ion batteries have received increasing attention in recent years. At present, a large number of zinc-ion batteries have been studied and reported, including button-type zinc-ion batteries, soft-pack zinc-ion batteries, thin-film zinc-ion batteries, etc.

[0004] However, there are few reports on yarn-shaped zinc-ion batteries, and their research faces many scientific problems: ① The commonly used active materials in zinc-ion batteries are metal oxide (manganese oxide, vanadium oxide, nickel oxide, cobalt oxide, etc.) powders, which need to be added with adhesives to assist in forming composite electrodes. However, these metal oxide powders are prone to agglomeration in the composite electrodes and have poor dispersibility; ② The active material loading in the yarn-shaped electrode is relatively low. Due to the requirements of flexibility, the active material loading in yarn-shaped batteries is generally low, and simply increasing the loading often affects the flexibility of the battery; ③ The conductivity of the yarn-shaped electrode is poor. Due to the large aspect ratio of the yarn-shaped electrode, the resistance is large. The commonly used metal oxide active materials have poor conductivity, which further affects the loading of the electrode; ④ The capacity of the yarn-shaped battery is low. Limited by the low loading and poor conductivity of the active materials in the yarn-shaped electrode, the capacity and energy density of current yarn-shaped zinc-ion batteries are generally low and cannot meet the requirements of wearable electronic devices for long battery life.

[0005] ⑤ The electrode materials are likely to cause environmental pollution. At present, the adhesives used in the preparation of electrode materials are mostly synthetic polymer materials, which have problems such as non-renewability, difficult recycling, and non-biodegradability, and are likely to cause damage to the environment.

[0006] The research team led by Zhi Chunyi from the City University of Hong Kong used flexible carbon nanotube (CNT) yarn as the substrate. On the one hand, the active material manganese dioxide (MnO2) was loaded onto the CNT by impregnation coating to obtain a yarn-shaped positive electrode. On the other hand, zinc was loaded onto the CNT by electrodeposition to obtain a yarn-shaped positive electrode. Finally, the yarn-shaped electrode was wound around an elastic fiber and wrapped with a gel electrolyte to obtain a yarn-shaped zinc ion battery (Li H., Liu Z., Liang G., Huang Y., Huang Y., Zhu M., Pei Z., Xue Q., Tang Z., Wang Y., Li B. Waterproof and tailorable elastic rechargeable yarn zinc ion batteries by a cross-linked polyacrylamide electrolyte. ACS nano. 2018, 12, 3140-3148.).

[0007] This technology has the following disadvantages: ① The MnO2 loaded by the impregnation method is uneven in the electrode and prone to agglomeration, which will reduce the effective surface area and active sites of the material.

[0008] ② The loading amount of MnO2 loaded by the impregnation method is not high (2.5 mg / cm), resulting in a low overall capacity.

[0009] ③ Due to the poor conductivity of MnO2, the rate performance of the prepared yarn-shaped battery is poor, affecting the fast charge and discharge performance.

[0010] ④ The artificial synthetic polyvinylidene fluoride (PVDF) needs to be added as an adhesive in the MnO2 impregnation solution, which is non-biodegradable and difficult to recycle, and is likely to cause damage to the environment.

[0011] The team of Zhu Kongjun from Nanjing University of Aeronautics and Astronautics added commercial vanadium pentoxide (V2O5) powder, carbon black, and PVDF into N-methylpyrrolidone (NMP) and stirred them evenly into a paste. The paste mixture was coated on silver-plated yarns through wet spinning to obtain a core-shell structured yarn-type electrode, which was then combined with zinc wires to form a fiber-shaped battery (Xu J., Zhu K., Zhu Z., Liang P., Zhang Z., Zheng H., Liu J., Yan K., Wang J. Continuous wet spinning of V2O5 fiber electrodes with silver-plated yarn core for Zn ion fiber batteries. Journal of Power Sources. 2024, 15, 235009.).

[0012] This technology has the following disadvantages: ① The particle size of commercial V2O5 is relatively large, with a small specific surface area and active sites, which affects the electrochemical activity of the active material.

[0013] ② The method of adding the active material later makes it difficult for V2O5 particles to be evenly dispersed in the electrode, further affecting the electrochemical performance of the active material.

[0014] ② The yarn in the scheme needs to be silver-plated, which has a high cost, and requires complex spinning equipment and spinnerets, resulting in a high preparation cost for the battery.

[0015] ③ The artificial synthetic PVDF is added as a binder in the electrode mixing slurry, which cannot be biodegradable and is difficult to recycle, and is likely to cause damage to the environment. Summary of the Invention

[0016] The present invention provides a method for preparing a high-capacity yarn-type zinc ion battery to solve the following technical problems: (1) The technical problem of the uniform dispersion of the active material in the electrode: Metal oxide-based active materials are prone to agglomeration in the composite electrode, resulting in a significant reduction in the effective surface area and active sites of the active material, thus affecting the battery performance.

[0017] (2) The problem that the active material loading in the yarn-type electrode is generally low, resulting in the problems that the capacity and energy density of the yarn-type zinc ion battery are generally low.

[0018] (3) There is a problem of weak interfacial bonding between the electrode and the electrolyte in the flexible zinc ion battery. Especially under dynamic deformation, the electrode and the electrolyte are prone to relative movement, affecting the structural stability and performance of the battery.

[0019] (4) The technical difficulty of yarn-type electrodes generally having low conductivity results in poor rate performance and cycle stability of the battery.

[0020] (5) Environmental pollution caused by composite electrode materials: Currently, the adhesives in composite electrodes are mostly synthetic polymer materials, which are non-renewable, difficult to recycle, and non-biodegradable, and are likely to cause damage to the environment.

[0021] The technical solution provided by the present invention is: A method for preparing a high-capacity yarn-type zinc ion battery comprises the following steps: S1. Preparation of mixed spinning solution: S1.1. Preparation of cellulose solution: The present invention uses low-cost absorbent cotton as a raw material and N,N-dimethylacetamide (DMAc) / LiCl as a solvent, and dissolves the absorbent cotton in DMAc / LiCl to obtain a cellulose solution.

[0022] The mass ratio of N,N-dimethylacetamide (DMAc) / LiCl is 92:8; the mass concentration range of dissolving absorbent cotton in DMAc / LiCl is 0.2%-2%.

[0023] S1.2. Preparation of MXene material: According to the following material ratio, a certain amount of LiF was added to HCl as an etching solution, and Ti3AlC2 powder was added and stirred thoroughly to obtain Ti3C2T x Type MXene materials.

[0024] S1.3. Prepare a manganese salt mixed spinning solution: add the MXene material prepared in S1.2 as a conductive additive to the cellulose solution prepared in S1.1, then add a certain amount of MnSO4 salt, and stir thoroughly to obtain a manganese salt mixed spinning solution.

[0025] The mass concentration range of MXene materials in cellulose solution is 0.5%-2%; the mass concentration range of MnSO4 salt is 0.1%-5%.

[0026] S2. Preparation of yarn-type composite cathode (MnO2@MXene / cellulose): S2.1. Prepare a spinning coagulation bath: Add a certain amount of KMnO4 salt into distilled water and stir thoroughly to obtain a spinning coagulation bath.

[0027] The KMnO4 salt concentration is 0.05 mol / L -1 mol / L.

[0028] S2.2. Spinning of Yarn-Type Composite Cathode: The manganese salt mixed spinning solution prepared in S2.1 is extruded for spinning at a certain speed. When the spinning solution enters the coagulation bath, a yarn-type MnO2@MXene / cellulose electrode will be rapidly formed.

[0029] During the coagulation process, a dual in-situ reaction will occur: (i) The cellulose solution will rapidly gelate when encountering water, forming a yarn-type gel substrate; (ii) At the same time, Mn 2+ ions in the spinning solution will rapidly diffuse outwards, while MnO4 - ions in the coagulation bath will diffuse into the gel along with water. When the two meet, a disproportionation reaction will occur to in-situ generate MnO2 nanoparticles; (iii) The cellulose around the generated MnO2 nanoparticles will immediately gelate and, together with MXene, surround the MnO2 nanoparticles, which can play a blocking role to prevent the nanoparticles from agglomerating with each other; (iv) MXene with excellent electrical conductivity acts as a conductive filler to improve the electrical conductivity of the electrode; (v) The mutual diffusion of ions during the coagulation process will generate a pore structure inside the gel, which is helpful for the subsequent diffusion of the electrolyte and ion transport.

[0030] S3. Preparation of Yarn-Type Composite Anode (Zn@MXene / cellulose): S3.1. Preparation of Zinc Mixed Spinning Solution: The preparation method and steps of the cellulose solution and MXene material are the same as those in S1. A certain amount of zinc powder and MXene material are added to the cellulose solution, and after stirring evenly, a zinc mixed spinning solution is obtained.

[0031] The mass concentration range of zinc powder is 0.1 - 5%, and the mass concentration range of MXene is 0.5% - 2%.

[0032] S3.2. Spinning of Yarn-Type Composite Anode: The zinc mixed spinning solution prepared in S3.1 is extruded for spinning at a certain speed. When the spinning solution enters distilled water, a yarn-type Zn@MXene / cellulose negative electrode will be rapidly formed.

[0033] S4. Assembly of Yarn-Type Zinc-Ion Battery: The MnO2@MXene / cellulose positive electrode prepared in step S2 and the Zn@MXene / cellulose negative electrode prepared in step S3 are respectively dipped in the cellulose solution and intertwined, and then placed in a ZnSO4 solution to coagulate into a yarn-type battery. The cellulose solution in which the electrodes are dipped will solidify into a gel when encountering water. On the one hand, it can prevent the direct contact between the positive electrode and the negative electrode; on the other hand, it can act as a gel electrolyte.

[0034] The mass concentration range of cellulose is 0.2% - 2%; the mass concentration range of ZnSO4 is 0.2 mol / L - 2 mol / L.

[0035] Furthermore, the in-situ generated active material can be replaced by metal oxides such as V2O5, VO2, NiO, Co3O4, etc. instead of MnO2.

[0036] The added conductive filler can be replaced by MXene with substances having good conductivity such as graphene, carbon nanotubes, activated carbon, acetylene black, etc.

[0037] The absorbent cotton can be replaced by biodegradable natural polymer materials such as chitin, chitosan, starch, etc.

[0038] The present invention has the following technical effects: (1) The yarn-shaped electrode dual in-situ electrospinning method. That is, the strategy of simultaneous in-situ gelation of the fiber substrate and in-situ generation of the oxide active material during the electrospinning process.

[0039] (2) The in-situ formed active material is nanoscale, with a very large specific surface area and high electrochemical activity. At the same time, the in-situ gelated substrate can play the role of blocking and confinement, preventing the aggregation of the in-situ generated oxide nanoparticles and making them uniformly dispersed in the electrode.

[0040] (3) The gel electrolyte and the positive and negative electrode substrates of the battery are made of the same material, which can eliminate the problem of poor bonding at the heterojunction interface to ensure firm and stable interfacial bonding of the yarn-shaped battery under different deformations.

[0041] (4) The substrate material of the electrode and the electrolyte are both natural biomass materials, which can be biodegradable and will not cause pollution to the environment, having the characteristics of environmental friendliness. Description of the Drawings

[0042] Figure 1 is the flowchart of the present invention; Figure 2 is the SEM image of the internal morphology of the MnO2@MXene / cellulose yarn-shaped electrode obtained in Example 1.

[0043] Figure 3 is the microscopic morphology image of the NiO@MXene / cellulose composite electrode obtained in Example 2. Detailed Embodiments

[0044] The technical solution of the present invention will be described in combination with the detailed embodiments.

[0045] Example 1 According to Figure 1 the steps shown: S1. Preparation of the mixed spinning solution: S1.1. Preparation of the cellulose solution: First, dissolve LiCl in N,N-dimethylacetamide (DMAc) to prepare the solvent (mass ratio 8:92). Then dissolve degreased cotton in DMAc / LiCl to obtain the cellulose solution with a cellulose mass concentration of 1%.

[0046] S1.2. Preparation of the MXene material: Add 8 g of LiF to 100 mL of 9 M HCl as the etching solution, add 5 g of Ti3AlC2 powder, stir well and etch for 12 hours to obtain the Ti3C2T x type MXene material.

[0047] S1.3. Preparation of the manganese salt mixed spinning solution: Use the MXene material prepared in S1.2 as the conductive additive and add it to the cellulose solution prepared in S1.1. Then add a certain amount of MnSO4 salt and stir well to obtain the manganese salt mixed spinning solution. The mass concentration of the MXene material in the cellulose solution is 1%; the mass concentration of the MnSO4 salt is 1%.

[0048] S2. Preparation of the yarn-shaped composite positive electrode (MnO2@MXene / cellulose): S2.1. Preparation of the spinning coagulation bath: Add a certain amount of KMnO4 salt (concentration 0.1 mol / L) to distilled water and stir well to obtain the spinning coagulation bath.

[0049] S2.2. Spinning of the yarn-shaped composite positive electrode: Extrude the manganese salt mixed spinning solution prepared in S2.1 at a certain speed for spinning. When the spinning solution enters the coagulation bath, a yarn-shaped MnO2@MXene / cellulose electrode will be formed rapidly.

[0050] S3. Preparation of the yarn-shaped composite negative electrode (Zn@MXene / cellulose): S3.1. Preparation of the zinc mixed spinning solution: The preparation method and steps of the cellulose solution and the MXene material are the same as those in S1. Add a certain amount of zinc powder (mass percentage 1%) and MXene material (mass percentage 1%) to the cellulose solution, stir evenly to obtain the zinc mixed spinning solution.

[0051] S3.2. Spinning of the yarn-shaped composite negative electrode: Extrude the zinc mixed spinning solution prepared in S3.1 at a certain speed for spinning. When the spinning solution enters distilled water, a yarn-shaped Zn@MXene / cellulose negative electrode will be formed rapidly.

[0052] S4. Assembly of the yarn-shaped zinc-ion battery Dip the MnO2@MXene / cellulose positive electrode prepared in step S2 and the Zn@MXene / cellulose negative electrode prepared in step S3 into a cellulose solution (mass concentration: 1%) respectively, intertwine them, and then place them in a ZnSO4 solution (concentration: 2 mol / L) to solidify into a yarn-shaped battery. The cellulose solution in which the electrodes are dipped will solidify into a gel when it encounters water. On the one hand, it can prevent the direct contact between the positive electrode and the negative electrode; on the other hand, it can act as a gel electrolyte.

[0053] This embodiment has the following effects: ① The active substance MnO2 in the yarn-shaped electrode is formed in-situ during the gelation process of cellulose, and the gelled cellulose can prevent the agglomeration of MnO2. Therefore, the generated MnO2 particles are nanosized (30 - 100 nm) and uniformly dispersed, as Figure 2 shown.

[0054] ② MXene is added as a conductive filler before the cellulose solidifies and is uniformly dispersed in the solidified electrode, making the yarn-shaped electrode have excellent conductivity (the conductivity reaches 8000 S / m), bringing good battery rate performance and cycle stability performance.

[0055] ③ By the method of in-situ generating MnO2, its loading amount can be greatly increased (the loading amount reaches more than 10 mg / cm), thereby improving the capacity (reaching more than 3 mAh / cm) and energy density (reaching more than 4 mWh / cm) of the yarn-shaped zinc-ion battery.

[0056] ④ The gel electrolyte of the battery and the positive and negative electrode substrates are both cellulose, eliminating the problem of poor interfacial bonding of heterojunctions, and ensuring that the interface of the yarn-shaped battery is firmly and stably bonded under different deformations.

[0057] ⑤ The prepared yarn-shaped zinc-ion battery has excellent flexibility and can be woven into clothes to provide energy for wearable devices.

[0058] ⑥ No artificially synthesized polymer materials or adhesives are used in this invention. The electrode substrate and the electrolyte are both cellulose gels, which have the advantage of biodegradability.

[0059] Example 2 S1. Preparation of the mixed spinning solution: S1.1. Preparation of the cellulose solution: First, dissolve LiCl in N,N-dimethylacetamide (DMAc) to prepare a solvent (mass ratio of 8:92). Then dissolve degreased cotton in DMAc / LiCl to obtain a cellulose solution with a cellulose mass concentration of 1%.

[0060] S1.2 Preparation of MXene material: 8 g LiF was added to 100 mL 9 M HCl as etching solution, and 5 g Ti3AlC2 powder was added and stirred thoroughly for 12 hours to obtain Ti3C2T x Type MXene materials.

[0061] S1.3. Prepare nickel salt mixed spinning solution: Add the MXene material prepared in S1.2 as a conductive additive to the cellulose solution prepared in S1.1, then add a certain amount of NiCl2 salt, and stir thoroughly to obtain a nickel salt mixed spinning solution. The mass concentration of MXene material in the cellulose solution is 1%; the concentration of NiCl2 is 1%.

[0062] S2. Preparation of yarn-type composite cathode (NiO@MXene / cellulose): S2.1. Prepare spinning coagulation bath: Add a certain amount of NaOH into distilled water and stir thoroughly to obtain an alkaline coagulation bath. The concentration of NaOH salt is 0.1 mol / L.

[0063] S2.2. Spinning of yarn-type composite cathode: The nickel salt mixed spinning solution prepared in S2.1 is extruded and spun at a certain speed. When the spinning solution enters the alkaline coagulation bath, a yarn-type NiO@MXene / cellulose electrode is quickly formed.

[0064] S3. Preparation of yarn-type composite anode (Zn@MXene / cellulose): S3.1. Preparation of zinc mixed spinning solution: The preparation method of cellulose solution and MXene material is the same as step S1. A certain amount of zinc powder and MXene material (are added to the cellulose solution and stirred evenly to obtain a zinc mixed spinning solution.

[0065] The concentration of zinc powder is 1%, and the concentration of MXene material is 1%.

[0066] S3.2. Spinning of yarn-type composite negative electrode: The zinc mixed spinning solution prepared in S3.1 is extruded and spun at a certain speed. When the spinning solution enters the distilled water, a yarn-type Zn@MXene / cellulose negative electrode is quickly formed.

[0067] S4. Assembly of yarn-based zinc-ion batteries: Dip the NiO@MXene / cellulose positive electrode prepared in step S2 and the Zn@MXene / cellulose negative electrode prepared in step S3 into the cellulose solution respectively, interweave them, and then put them into the ZnSO4 solution to solidify into a yarn-shaped battery. The cellulose solution in which the electrodes are dipped will solidify into a gel when it meets water. On the one hand, it can prevent the direct contact between the positive electrode and the negative electrode; on the other hand, it can act as a gel electrolyte.

[0068] The mass concentration of cellulose is 1%; the concentration of the ZnSO4 solution is 2 mol / L.

[0069] This embodiment has the following effects: ① The active substance NiO in the yarn-shaped electrode is formed in-situ during the gelation process of cellulose, and the gelled cellulose can prevent the aggregation of NiO. Therefore, the generated NiO particles are nanosized and evenly dispersed, as Figure 3 shown.

[0070] ② MXene is added as a conductive filler before the cellulose solidifies and is evenly dispersed in the solidified electrode, making the yarn-shaped electrode have excellent conductivity (the conductivity reaches 6700 S / m), bringing good battery rate performance and cycle stability performance.

[0071] ③ By the method of in-situ generating NiO, its loading amount can be greatly increased (the loading amount reaches more than 8.9 mg / cm), thereby improving the capacity (reaching more than 2.6 mAh / cm) and energy density (reaching more than 3.3 mWh / cm) of the yarn-shaped zinc-ion battery.

[0072] ④ The gel electrolyte of the battery and the positive and negative electrode substrates are both cellulose, eliminating the problem of poor interfacial bonding of the heterojunction surface, and ensuring that the interface of the yarn-shaped battery is firmly and stably bonded under different deformations.

[0073] ⑤ The prepared yarn-shaped zinc-ion battery has excellent flexibility and can be woven into clothes to provide energy for wearable devices.

[0074] ⑥ No artificially synthesized polymer materials are used in this invention, and no adhesives are used. The electrode substrate and the electrolyte are both cellulose gels, which have the advantage of biodegradability.

Claims

1. Preparation method of high-capacity yarn-type zinc-ion battery, characterized in that, It includes the following steps: S1. Preparation of cellulose-based mixed spinning solution: S1.

1. Preparation of cellulose solution: N,N-dimethylacetamide / LiCl is mixed to form DMAc / LiCl as the solvent, and the natural polymer material is dissolved in DMAc / LiCl to obtain the cellulose solution; S1.

2. Preparation of conductive filler material: Add LiF into the HCl solution as the etching solution, add Ti3AlC2 powder and stir well for etching to obtain the Ti3C2Tx x type conductive filler material; S1.

3. Preparation of metal salt mixed spinning solution: The conductive filler material prepared in S1.2 is added as a conductive additive to the cellulose solution prepared in S1.1; subsequently, the metal oxide salt is added, and after sufficient stirring, the metal oxide salt mixed spinning solution is obtained; S2. Preparation of yarn-shaped composite positive electrode metal oxide@conductive filler / cellulose: S2.

1. Preparation of spinning coagulation bath: The metal salt is added to distilled water, and after sufficient stirring, the spinning coagulation bath is obtained; S2.

2. Yarn-shaped composite positive electrode spinning: The metal oxide salt mixed spinning solution prepared in S2.1 is extruded for spinning. When the spinning solution enters the coagulation bath, it solidifies to form a yarn-shaped metal oxide@conductive filler / cellulose electrode; S3. Preparation of yarn-shaped composite negative electrode Zn@conductive filler / cellulose: S3.

1. Preparation of zinc mixed spinning solution: The preparation method and steps of the cellulose solution and the conductive filler material are the same as those in S1; Zinc powder and the conductive filler material are added to the cellulose solution, and after stirring evenly, the zinc mixed spinning solution is obtained; S3.

2. Linear composite negative electrode spinning: The zinc mixed spinning solution prepared in S3.1 is extruded for spinning. When the spinning solution enters distilled water, a yarn-shaped Zn@conductive filler / cellulose negative electrode is formed; S4. Assembly of yarn-shaped zinc ion battery: The metal oxide@conductive filler / cellulose positive electrode prepared in step S2 and the Zn@conductive filler / cellulose negative electrode prepared in step S3 are respectively dipped in the cellulose solution, intertwined together, and then placed in the zinc salt solution to solidify into a yarn-shaped battery.

2. The preparation method of the high-capacity yarn-type zinc ion battery according to claim 1, wherein In S1.1, the mass ratio of N,N-dimethylacetamide / LiCl is 92:8; in the cellulose solution, the mass concentration of degreased cotton is 0.2%-2%.

3. The preparation method of the high-capacity yarn-type zinc ion battery according to claim 1, characterized in that, In S1.2, according to the following material ratio: 8 g LiF: 100 mL 9 M HCl solution: 5 g Ti3AlC2 powder, stir and etch for 12 hours.

4. The preparation method of the high-capacity yarn-type zinc ion battery according to claim 1, wherein, In S1.2, the conductive filler is MXene, graphene, carbon nanotubes, activated carbon or acetylene black.

5. The preparation method of the high-capacity yarn-type zinc ion battery according to claim 1, wherein In S1.3, the mass concentration of the conductive filler material in the cellulose solution is 0.5%-2%; The metal oxide is MnO2, V2O5, VO2, NiO, or Co3O4; the mass concentration of the metal oxide salt is 0.1%-5%.

6. The preparation method of the high-capacity yarn-type zinc ion battery according to claim 1, characterized in that In S2.1, the concentration of the metal oxide salt is 0.05 mol / L - 1 mol / L.

7. The preparation method of the high-capacity yarn-shaped zinc-ion battery according to claim 1, characterized in that, In S3.1, the mass concentration of zinc powder is 0.1-5%, and the mass concentration of the conductive filler material is 0.5%-2%.

8. The preparation method of the high-capacity yarn-shaped zinc ion battery according to claim 1, characterized in that The concentration of the cellulose solution in S4 is 0.2% - 2%; the zinc salt solution can be: ZnSO4 solution, ZnCl2 solution, Zn(NO3)2 solution, Zn(CH3COO)2 solution, and the solution concentration is 0.2 mol / L - 2 mol / L.

9. A high-capacity yarn-type zinc ion battery obtained by the method for preparing a high-capacity yarn-type zinc ion battery according to any one of claims 1 to 8.

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