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

Abstract

The present invention provides a high-capacity yarn-type zinc ion battery and a preparation method thereof, belonging to the technical field of ion batteries; a conductive filler material is added to a cellulose solution as a conductive additive, a metal salt is added to obtain a metal salt mixed spinning solution, and extrusion spinning is performed to obtain a mixed positive electrode; zinc powder and a conductive filler material are added to the cellulose solution, extruded and spun to form a mixed negative electrode; the positive electrode and the negative electrode are respectively dipped in the cellulose solution, interwoven together, and placed in an electrolyte to solidify into a yarn-type battery. The present invention has a strategy of synchronously carrying out in-situ gelation of the fiber substrate and in-situ generation of oxide active substances during the spinning process. The active substances formed in situ are nano-sized, have a very large specific surface area and high electrochemical activity. The base material of the electrode and the electrolyte are both natural biomass materials, which are biodegradable and will not pollute the environment, and are green and environmentally friendly.

Description

Technical Field

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

[0002] Aqueous zinc-ion batteries have received increasing attention in recent years due to their simple preparation, low cost, good safety, and environmental friendliness. They are believed to have broad application prospects in the field of wearable electronics.

[0003] Aqueous zinc-ion batteries (Zn-ion batteries) have attracted increasing attention in recent years due to their unique advantages and great application prospects. A large number of Zn-ion batteries have been studied and reported, including button-type Zn-ion batteries, soft-pack Zn-ion batteries, and thin-film Zn-ion batteries.

[0004] However, there are few reports on yarn-based zinc-ion batteries, and their research faces many scientific challenges:

[0005] ① The active materials commonly used in zinc-ion batteries are metal oxide (manganese oxide, vanadium oxide, nickel oxide, cobalt oxide, etc.) powders, which require the addition of adhesives to assist in forming composite electrodes. However, these metal oxide powders tend to agglomerate in composite electrodes and have poor dispersion.

[0006] ② The active material loading in yarn-type electrodes is low. Due to the flexibility requirements of yarn-type batteries, the active material loading is generally low, and simply increasing the loading will often affect the flexibility of the battery;

[0007] ③ Yarn-type electrodes have poor conductivity. Due to their large aspect ratio, yarn-type electrodes have high resistance. Commonly used metal oxide active materials are not conductive, which further affects the electrode loading capacity.

[0008] ④ Yarn-based batteries have low capacity. Limited by the low loading amount of active materials and poor conductivity in yarn-based electrodes, the capacity and energy density of yarn-based zinc-ion batteries are generally low, which cannot meet the long-life requirements of wearable electronic devices.

[0009] ⑤ Electrode materials are prone to environmental pollution. Currently, the adhesives used in the preparation of electrode materials are mostly synthetic polymers, which are non-renewable, difficult to recycle, and non-biodegradable, and are likely to cause damage to the environment.

[0010] Chunyi Zhi's team at City University of Hong Kong used flexible carbon nanotube (CNT) yarns as a substrate. They loaded manganese dioxide (MnO2) onto the CNTs via dip-coating to create a yarn-based cathode. Zn was then loaded onto the CNTs via electrodeposition to create a yarn-based cathode. Finally, the yarn-based electrodes were wrapped around elastic fibers and coated with a gel electrolyte to create a yarn-based 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 electrode. ACS nano. 2018, 12, 3140-3148.).

[0011] This technology has the following disadvantages:

[0012] ① The MnO2 loaded by the impregnation loading method is uneven in the electrode and prone to agglomeration, which will reduce the effective surface area and active sites of the material.

[0013] ② The MnO2 loading amount loaded by the impregnation loading method is not high (2.5 mg / cm), resulting in a low overall capacity.

[0014] ③ Due to the poor conductivity of MnO2, the prepared yarn-type battery has poor rate performance, which affects the fast charging and discharging performance.

[0015] ④ Artificially synthesized polyvinylidene fluoride (PVDF) needs to be added to the MnO2 impregnation solution as an adhesive. It is non-biodegradable and difficult to recycle, and is likely to cause damage to the environment.

[0016] Zhu Kongjun's team from Nanjing University of Aeronautics and Astronautics added commercial vanadium pentoxide (V2O5) powder, carbon black and PVDF to N-methylpyrrolidone (NMP) and stirred them evenly into a paste. The paste mixture was coated on silver-plated yarn by wet spinning to obtain a yarn-type electrode with a core-shell structure, which was then combined with zinc wire to form a fiber-mounted battery (Xu J., Zhu K., Zhu Z., Liang P., Zhang Z., Zheng H., Liu J., Yan K., Wang J. Continuous wetspinning of V2O5 fiber electrodes with silver-plated yarn core for Zn ionfiber batteries. Journal of Power Sources. 2024, 15, 235009.).

[0017] This technology has the following disadvantages:

[0018] ① Commercial V2O5 particles are large in size, with small specific surface area and active sites, which affects the electrochemical activity of the active material.

[0019] ② The post-addition method of active materials makes it difficult to disperse V2O5 particles very evenly in the electrode, further affecting the electrochemical performance of the active materials.

[0020] ② The yarn in the scheme needs to be silver-plated, which is very expensive, and requires complex spinning equipment and spinnerets, which makes the battery preparation cost high.

[0021] ③ Artificially synthesized PVDF is added to the electrode mixed slurry as a binder, which is non-biodegradable and difficult to recycle, and is likely to cause damage to the environment. Summary of the Invention

[0022] The present invention provides a method for preparing a high-capacity yarn-type zinc ion battery to solve the following technical problems:

[0023] (1) Technical difficulties in uniformly dispersing active materials in electrodes: Metal oxide active materials tend to agglomerate in composite electrodes, resulting in a significant reduction in the effective surface area and active sites of the active materials, thereby affecting battery performance.

[0024] (2) The problem of generally low active material loading in yarn-type electrodes leads to generally low capacity and energy density of yarn-type zinc-ion batteries.

[0025] (3) There is a problem of weak interface bonding between electrodes and electrolytes in flexible zinc-ion batteries. Especially under dynamic deformation, the electrodes and electrolytes are prone to relative movement, affecting the structural stability and performance of the battery.

[0026] (4) The technical difficulty of low conductivity of yarn-type electrodes leads to poor rate performance and cycle stability of the battery.

[0027] (5) Environmental pollution problems 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.

[0028] The technical solution provided by the present invention is:

[0029] A method for preparing a high-capacity yarn-type zinc ion battery comprises the following steps:

[0030] S1. Preparation of mixed spinning solution:

[0031] 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. The absorbent cotton is dissolved in DMAc / LiCl to obtain a cellulose solution.

[0032] The mass ratio of N,N-dimethylacetamide (DMAc) / LiCl is 92:8; the absorbent cotton is dissolved in DMAc / LiCl at a mass concentration range of 0.2%-2%.

[0033] 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.

[0034] 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.

[0035] The mass concentration of MXene materials in cellulose solution ranges from 0.5% to 2%; the mass concentration of MnSO4 salt ranges from 0.1% to 5%.

[0036] S2. Preparation of Yarn-Type Composite Cathode (MnO2@MXene / cellulose):

[0037] S2.1. Prepare a spinning coagulation bath: Add a certain amount of KMnO4 salt to distilled water and stir thoroughly to obtain a spinning coagulation bath.

[0038] The KMnO4 salt concentration is 0.05 mol / L -1 mol / L.

[0039] S2.2. Spinning of Yarn-Type Composite Cathode: The manganese salt mixed spinning solution prepared in S2.1 is extruded and spun at a certain speed. When the spinning solution enters the coagulation bath, a yarn-type MnO2@MXene / cellulose electrode is rapidly formed.

[0040] During the solidification process, two in-situ reactions occur:

[0041] (i) The cellulose solution rapidly gels upon contact with water, forming a yarn-like gel matrix;

[0042] (ii) At the same time, Mn in the spinning solution 2+ The ions will diffuse outward quickly, and the MnO4 in the coagulation bath - Ions will diffuse into the gel along with water, and when the two meet, a neutralization reaction will occur to generate MnO2 nanoparticles in situ;

[0043] (iii) The cellulose around the generated MnO2 nanoparticles will then gel and surround the MnO2 nanoparticles together with MXene, which can act as a barrier and prevent the nanoparticles from agglomerating with each other;

[0044] (iv) MXene with excellent conductive properties is used as a conductive filler to improve the conductivity of the electrode;

[0045] (v) During the solidification process, the mutual diffusion of ions will produce a pore structure inside the gel, which is conducive to the subsequent diffusion of electrolyte and ion transport.

[0046] S3. Preparation of yarn-type composite anode (Zn@MXene / cellulose):

[0047] S3.1. Prepare the zinc mixed spinning solution: The cellulose solution and MXene material are prepared in the same manner as in step S1. Add a certain amount of zinc powder and MXene material to the cellulose solution and stir until uniform to obtain the zinc mixed spinning solution.

[0048] The mass concentration range of zinc powder is 0.1-5%, and the mass concentration range of MXene is 0.5%-2%.

[0049] S3.2. Spinning of a Yarn-Type Composite Anode: The zinc mixed spinning solution prepared in S3.1 is extruded and spun at a constant speed. When the spinning solution enters distilled water, a yarn-type Zn@MXene / cellulose negative electrode is rapidly formed.

[0050] S4. Assembly of Yarn-Based Zn-Ion Batteries:

[0051] The MnO2@MXene / cellulose cathode prepared in step S2 and the Zn@MXene / cellulose anode prepared in step S3 are each dipped in a cellulose solution, interwoven together, and then placed in a ZnSO4 solution to solidify into a yarn-like battery. The cellulose solution solidifies into a gel upon contact with water, preventing direct contact between the cathode and anode while also acting as a gel electrolyte.

[0052] The cellulose mass concentration range is 0.2%-2%; the ZnSO4 mass concentration range is 0.2 mol / L-2 mol / L.

[0053] Furthermore, the in situ generated active material can be replaced by metal oxides such as V2O5, VO2, NiO, and Co3O4 instead of MnO2.

[0054] The added conductive filler can be replaced by MXene with graphene, carbon nanotubes, activated carbon, acetylene black and other materials with good conductivity.

[0055] Absorbent cotton can be replaced by biodegradable natural polymer materials such as chitin, chitosan, and starch.

[0056] The present invention has the following technical effects:

[0057] (1) Yarn-type electrode dual in-situ spinning method. This is a strategy in which the in-situ gelation of the fiber substrate and the in-situ generation of the oxide active material are carried out simultaneously during the spinning process.

[0058] (2) The active material formed in situ is nanosized, with a very large specific surface area and high electrochemical activity. At the same time, the in situ gelled substrate can play a role of barrier and confinement, preventing the in situ generated oxide nanoparticles from agglomerating and making them uniformly dispersed in the electrode.

[0059] (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 between heterojunctions and ensure that the interface bonding of the yarn-type battery is firm and stable under different deformations.

[0060] (4) The base material of the electrode and the electrolyte are both natural biomass materials, which are biodegradable and will not pollute the environment, and are green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a flow chart of the present invention;

[0062] Figure 2 This is the SEM image of the internal morphology of the MnO2@MXene / cellulose yarn-type electrode obtained in Example 1.

[0063] Figure 3 This is the microscopic morphology of the NiO@MXene / cellulose composite electrode obtained in Example 2. DETAILED DESCRIPTION

[0064] The technical solution of the present invention is described with reference to specific embodiments.

[0065] Example 1

[0066] according to Figure 1 Steps shown:

[0067] S1. Preparation of mixed spinning solution:

[0068] S1.1. Prepare a cellulose solution: First, dissolve LiCl in N,N-dimethylacetamide (DMAc) to create a solvent (mass ratio of 8:92). Then, dissolve cotton wool in the DMAc / LiCl mixture to create a cellulose solution with a cellulose concentration of 1%.

[0069] S1.2 Preparation of MXene material: 8 g of LiF was added to 100 mL of 9 M HCl as the etching solution, and 5 g of Ti3AlC2 powder was added and stirred thoroughly for 12 hours to obtain Ti3C2T x type MXene materials.

[0070] 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 predetermined amount of MnSO₄ salt and stir thoroughly to obtain a 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%.

[0071] S2. Preparation of Yarn-Type Composite Cathode (MnO2@MXene / cellulose):

[0072] S2.1. Prepare a spinning coagulation bath: Add a certain amount of KMnO4 salt (concentration 0.1 mol / L) to distilled water and stir thoroughly to obtain a spinning coagulation bath.

[0073] S2.2. Spinning of Yarn-Type Composite Cathode: The manganese salt mixed spinning solution prepared in S2.1 is extruded and spun at a certain speed. When the spinning solution enters the coagulation bath, a yarn-type MnO2@MXene / cellulose electrode is rapidly formed.

[0074] S3. Preparation of yarn-type composite anode (Zn@MXene / cellulose):

[0075] S3.1. Prepare the zinc mixed spinning solution: The cellulose solution and MXene material are prepared in the same manner as in step S1. Add a certain amount of zinc powder (1% by mass) and MXene material (1% by mass) to the cellulose solution and stir until uniformly mixed to obtain the zinc mixed spinning solution.

[0076] S3.2. Spinning of a Yarn-Type Composite Anode: The zinc mixed spinning solution prepared in S3.1 is extruded and spun at a constant speed. When the spinning solution enters distilled water, a yarn-type Zn@MXene / cellulose negative electrode is rapidly formed.

[0077] S4. Assembly of Yarn-Based Zn-Ion Batteries:

[0078] The MnO2@MXene / cellulose cathode prepared in step S2 and the Zn@MXene / cellulose anode prepared in step S3 were separately dipped in a cellulose solution (mass concentration: 1%) and interwoven together. The yarn was then placed in a ZnSO4 solution (concentration: 2 mol / L) to solidify into a yarn-like battery. The cellulose solution solidifies into a gel upon contact with water, preventing direct contact between the cathode and anode while also acting as a gel electrolyte.

[0079] This embodiment has the following effects:

[0080] ① The active substance MnO2 in the yarn-type electrode is formed in situ during the gelation of cellulose, and the gelled cellulose can prevent MnO2 from agglomerating. Therefore, the generated MnO2 particles are nano-sized (30-100 nm) and evenly dispersed, such as Figure 2 shown.

[0081] ② MXene is added as a conductive filler before cellulose coagulation, and is evenly dispersed in the electrode after coagulation, making the yarn-type electrode excellent in conductivity (conductivity reaches 8000 S / m), bringing good battery rate performance and cycle stability.

[0082] ③ By in situ generating MnO2, its loading capacity can be greatly increased (the loading capacity reaches more than 10 mg / cm), thereby increasing the capacity (reaching more than 3 mAh / cm) and energy density (reaching more than 4 mWh / cm) of yarn-type zinc-ion batteries.

[0083] ④ The battery's gel electrolyte and positive and negative electrode substrates are all made of cellulose, which eliminates the problem of poor bonding between heterojunctions and ensures that the interface bonding of the yarn-type battery is firm and stable under different deformations.

[0084] ⑤ The prepared yarn-type zinc-ion battery has excellent flexibility and can be woven into clothing to provide energy for wearable devices.

[0085] ⑥ This invention uses no synthetic polymer materials or adhesives. The electrode substrate and electrolyte are both cellulose gel, which has the advantage of being biodegradable.

[0086] Example 2

[0087] S1. Preparation of mixed spinning solution:

[0088] S1.1. Prepare a cellulose solution: First, dissolve LiCl in N,N-dimethylacetamide (DMAc) to create a solvent (mass ratio of 8:92). Then, dissolve cotton wool in the DMAc / LiCl mixture to create a cellulose solution with a cellulose concentration of 1%.

[0089] S1.2 Preparation of MXene material: 8 g of LiF was added to 100 mL of 9 M HCl as the etching solution, and 5 g of Ti3AlC2 powder was added and stirred thoroughly for 12 hours to obtain Ti3C2T x type MXene materials.

[0090] S1.3. Prepare a 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 the MXene material in the cellulose solution is 1%; the concentration of NiCl₂ is 1%.

[0091] S2. Preparation of Yarn-Type Composite Cathode (NiO@MXene / cellulose):

[0092] S2.1. Prepare the spinning coagulation bath: Add a certain amount of NaOH to distilled water and stir thoroughly to obtain an alkaline coagulation bath. The NaOH salt concentration should be 0.1 mol / L.

[0093] S2.2. Yarn-type composite cathode spinning: The nickel salt mixed spinning solution prepared in S2.1 is extruded and spun at a constant speed. When the spinning solution enters the alkaline coagulation bath, a yarn-type NiO@MXene / cellulose electrode is rapidly formed.

[0094] S3. Preparation of yarn-type composite anode (Zn@MXene / cellulose):

[0095] S3.1. Prepare the zinc mixed spinning solution: The cellulose solution and MXene material are prepared in the same manner as in step S1. Add a certain amount of zinc powder and MXene material to the cellulose solution and stir until uniformly mixed to obtain the zinc mixed spinning solution.

[0096] The concentration of zinc powder is 1%, and the concentration of MXene material is 1%.

[0097] S3.2. Spinning of a Yarn-Type Composite Anode: The zinc mixed spinning solution prepared in S3.1 is extruded and spun at a constant speed. When the spinning solution enters distilled water, a yarn-type Zn@MXene / cellulose negative electrode is rapidly formed.

[0098] S4. Assembly of Yarn-Based Zn-Ion Batteries:

[0099] The NiO@MXene / cellulose cathode prepared in step S2 and the Zn@MXene / cellulose anode prepared in step S3 are each dipped in a cellulose solution, interwoven together, and then placed in a ZnSO₄ solution to solidify into a yarn-like battery. The cellulose solution solidifies into a gel upon contact with water, preventing direct contact between the cathode and anode while also acting as a gel electrolyte.

[0100] The mass concentration of cellulose is 1%; the concentration of ZnSO4 solution is 2 mol / L.

[0101] This embodiment has the following effects:

[0102] ① The active material NiO in the yarn-type electrode is formed in situ during the gelation of cellulose, and the gelled cellulose can prevent NiO from agglomerating, so the generated NiO particles are nano-sized and evenly dispersed, such as Figure 3 shown.

[0103] ② MXene is added as a conductive filler before cellulose coagulation, and is evenly dispersed in the electrode after coagulation, making the yarn-type electrode excellent in conductivity (the conductivity reaches 6700 S / m), bringing good battery rate performance and cycle stability.

[0104] ③ By in situ generating NiO, its loading capacity can be greatly increased (the loading capacity reaches above 8.9 mg / cm), thereby increasing the capacity (reaching above 2.6 mAh / cm) and energy density (reaching above 3.3 mWh / cm) of yarn-type zinc-ion batteries.

[0105] ④ The battery's gel electrolyte and positive and negative electrode substrates are all made of cellulose, which eliminates the problem of poor bonding between heterojunctions and ensures that the interface bonding of the yarn-type battery is firm and stable under different deformations.

[0106] ⑤ The prepared yarn-type zinc-ion battery has excellent flexibility and can be woven into clothing to provide energy for wearable devices.

[0107] ⑥ This invention uses no synthetic polymer materials or adhesives. The electrode substrate and electrolyte are both cellulose gel, which has the advantage of being biodegradable.

Claims

1. A method for preparing a high-capacity yarn-type zinc ion battery, characterized in that: The following steps are involved: S1. Preparation of cellulose-based mixed spinning solution: S1.

1. Prepare a cellulose solution: Prepare a mixture of N,N-dimethylacetamide and LiCl (DMAc / LiCl) as a solvent and dissolve the natural polymer in the DMAc / LiCl to obtain a cellulose solution. The natural polymer material is absorbent cotton; S1.

2. Preparation of conductive filler material: Add LiF to HCl solution as etching solution, add Ti3AlC2 powder and stir thoroughly to obtain Ti3C2T x Type conductive filler material; S1.

3. Prepare a metal salt mixed spinning solution: Add the conductive filler material prepared in S1.2 as a conductive additive to the cellulose solution prepared in S1.1; then add MnSO₄ salt and stir thoroughly to obtain a manganese salt mixed spinning solution, or add NiCl₂ salt and stir thoroughly to obtain a nickel salt mixed spinning solution; S2. Preparation of Yarn-Type Composite Cathode Metal Oxide@Conductive Filler / Cellulose: S2.

1. Prepare a spinning coagulation bath: Add KMnO4 or NaOH to distilled water and stir thoroughly to obtain a spinning coagulation bath. S2.

2. Spinning a Yarn-Type Composite Cathode: Extrude and spin the metal salt mixed spinning solution prepared in S1.

3. When the spinning solution enters a coagulation bath, it solidifies to form a yarn-type MnO2 or NiO@conductive filler / cellulose electrode. S3. Preparation of Yarn-Type Composite Anode Zn@Conductive Filler / Cellulose: S3.

1. Prepare the zinc mixed spinning solution: The cellulose solution and conductive filler material are prepared in the same manner as in step S1. adding zinc powder and conductive filler material into cellulose solution and stirring evenly to obtain zinc mixed spinning solution; S3.

2. Spinning a linear composite negative electrode: Extrude and spin the zinc mixed spinning solution prepared in S3.

1. When the spinning solution enters distilled water, a yarn-shaped Zn@conductive filler / cellulose negative electrode is formed. S4. Assembly of Yarn-Based Zn-Ion Batteries: The MnO2 or NiO@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, interwoven together, and then placed in a zinc salt solution to solidify into a yarn-type battery.

2. The method for preparing a 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; and the mass concentration of the absorbent cotton in the cellulose solution is 0.2%-2%.

3. The method for preparing a high-capacity yarn-type zinc ion battery according to claim 1, wherein: In S1.2, the following material ratio is used: 8 g LiF: 100 mL 9 M HCl solution: 5 g Ti3AlC2 powder, and the mixture is stirred and etched for 12 hours.

4. The method for preparing a high-capacity yarn-type zinc ion battery according to claim 1, wherein In S1.3, the conductive filler material is in the cellulose solution at a mass concentration of 0.5%-2%; The mass concentration of MnSO4 or NiCl2 is 0.1%-5%.

5. The method for preparing a high-capacity yarn-type zinc ion battery according to claim 1, wherein: In S2.1, the concentration of KMnO4 or NaOH is 0.05 mol / L -1 mol / L.

6. The method for preparing a high-capacity yarn-type zinc ion battery according to claim 1, wherein: S3.1 The mass concentration of zinc powder is 0.1-5%, and the mass concentration of conductive filler material is 0.5%-2%.

7. The method for preparing a high-capacity yarn-type zinc ion battery according to claim 1, wherein: The concentration of cellulose solution in S4 is 0.2%-2%; the zinc salt solutions are: ZnSO4 solution, ZnCl2 solution, Zn(NO3)2 solution, Zn(CH3COO)2 solution, and the solution concentration is 0.2 mol / L-2 mol / L.

8. A high-capacity yarn-type zinc ion battery obtained according to the method for preparing a high-capacity yarn-type zinc ion battery according to any one of claims 1 to 7.

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