Wood-based self-supporting flexible electrode material for energy storage and preparation method thereof

Abstract

The invention discloses a wood-based self-supporting flexible electrode material for energy storage and a preparation method of the wood-based self-supporting flexible electrode material, and belongs to the technical field of energy storage, the wood-based self-supporting flexible electrode material has low torsion resistance and an ordered conduction path, and can simultaneously realize better rapid ion diffusion and rapid charge conduction. The oriented micro-channel carbon material is prepared by carbonizing lignin-removed poplar slices. The delignified wood carbon material has a huge inter-tube cavity and a unique arrangement micro-channel structure, has good flexibility, and can significantly improve the cycling stability and the first effect.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a wood-based self-supporting flexible electrode material for energy storage and its preparation method. Background Technology

[0002] In the near future, flexible wearable smart electronic devices will significantly change our lifestyles and bring us great convenience. However, currently, flexible electrochemical energy storage units lag behind other components of flexible wearable smart electronic devices, becoming a bottleneck in their development. Against this backdrop, flexible electrochemical energy storage devices capable of maintaining high-quality energy storage performance and long-term stability under continuous mechanical deformation have attracted considerable attention. The energy storage capacity of electrochemical energy storage devices (such as supercapacitors and lithium-ion batteries) largely depends on the performance of electrode materials (including microstructure, conductivity, and specific surface area). Therefore, a key challenge for high-performance flexible electrochemical energy storage devices is designing a flexible, self-supporting electrode material.

[0003] Generally, electrochemical energy storage devices (such as supercapacitors and batteries) share fundamental processes involving ion diffusion and storage, as well as electron transport in electrode materials. Therefore, electrode materials must rapidly transport ions to the electrode and rapidly transport electrons to the external circuitry. 3D carbon framework materials comprise a continuous 3D conductive scaffold that facilitates electron transport and an open 3D porous network that facilitates ion diffusion. This carbon framework structure achieves large ion diffusion kinetics and high electronic conductivity even in thick, bulk electrodes, which is ideal for realizing high-rate and high-capacity energy storage in electrode materials. Furthermore, three-dimensional carbon framework materials are not only ideal and efficient scaffold materials for loading electrochemically active materials, but also flexible electrode materials with enormous application potential. Therefore, in recent years, researchers have focused on discovering flexible self-supporting 3D carbon framework electrode materials. Flexible three-dimensional carbon framework materials (made from carbon, carbon nanotubes, graphene, carbon nanosheets, etc.) have been successfully prepared. However, these flexible three-dimensional carbon framework materials typically only contain disordered three-dimensional conductive carbon scaffolds with disordered pores. Compared to oriented three-dimensional carbon framework structures, disordered three-dimensional carbon framework structures may not be able to achieve the potential of fully flexible self-supporting electrode materials due to their lower mass transport and high torsion. Furthermore, with the increasing global environmental pollution and rapid climate change, flexible oriented three-dimensional carbon framework materials and their fabrication processes should be environmentally friendly, inexpensive, and relatively simple.

[0004] Therefore, this application is submitted. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a wood-based self-supporting flexible electrode material for energy storage and its preparation method. The wood-based self-supporting flexible electrode material of this invention has low twist and ordered conduction paths, enabling simultaneous and better rapid ion diffusion and charge conduction. Directional microchannel carbon materials were prepared by carbonizing delignin-treated poplar wood chips. The delignin-treated wood-based carbon materials possess large interductular lumens and a uniquely arranged microchannel structure, exhibiting good flexibility and significantly improving cycling stability and first-efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0008] (1) Add poplar wood slices to sodium chlorite solution and boil until the poplar wood slices turn completely white, then rinse with deoxygenated water;

[0009] (2) Place poplar wood chips in a tube furnace and heat them to 380-420°C at the first heating rate, and then heat them to 600-800°C at the second heating rate to carbonize them, thereby obtaining the precursor.

[0010] (3) Add aniline and ethanol to the perchloric acid solution and stir until homogeneous to obtain the first mixture; add ammonium persulfate to the perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution;

[0011] (4) The precursor is soaked in the modified liquid, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0012] This invention first boils poplar wood chips in a sodium chlorite solution until the chips turn completely white. Then, the chips are treated with a specific heating rate to pyrolyze cellulose and hemicellulose, generating volatile gases (CO, CH4) and forming preliminary pores (pore size 1-5 μm). Carbonization is then performed at a high temperature (600-800℃), increasing the graphitization degree of the carbon skeleton, enhancing conductivity, and increasing specific surface area. Subsequently, the chips are treated with a solution containing specific concentrations of aniline and ammonium persulfate to obtain a wood-based self-supporting flexible electrode material with low distortion and ordered conduction pathways. This wood-based self-supporting flexible electrode material can simultaneously achieve better rapid ion diffusion and rapid charge conduction. A directional microchannel carbon material was prepared by carbonizing delignin-treated poplar wood chips. The delignin-treated wood-based carbon material has a large interductal lumen and a unique arrangement of microchannels, exhibiting good flexibility and significantly improving cycle stability and first-efficiency.

[0013] In a preferred embodiment of the present invention, the sodium chlorite solution has a mass concentration of 4-10% and a pH of 4-5, wherein the pH of the sodium chlorite solution is adjusted to 4-5 by acid.

[0014] Treatment with a sodium chlorite solution at pH 4–5 can selectively decompose the phenolic structure in lignin through oxidation, preserving the cellulose skeleton and preventing the collapse of microchannels in the wood. Simultaneously, the rate of sodium chlorite decomposition into ClO2 and Cl- is balanced, reducing excessive oxidation of cellulose and hemicellulose. When the pH is below 4, lignin rapidly oxidizes and degrades, but cellulose and hemicellulose chains break, leading to a decrease in the mechanical strength and electrochemical properties of the wood chips. When the pH is above 5, the oxidizing power of sodium chlorite weakens, resulting in low lignin removal efficiency (experiments show that lignin removal time is extended by 2 times at pH 7). Residual lignin hinders the formation of microchannels during subsequent carbonization. Therefore, strict control of the pH at 4–5 is necessary.

[0015] In a preferred embodiment of the present invention, the first heating rate is 4 to 6 °C / min.

[0016] In a preferred embodiment of the present invention, the second heating rate is 0.5 to 2 °C / min.

[0017] In a preferred embodiment of the present invention, the carbonization time is 2 to 4 hours.

[0018] As a preferred embodiment of the present invention, the ratio of the amount of aniline, ethanol and perchloric acid solution is (0.1-2) mmol: (10-15) mL: (40-100) mL.

[0019] In a preferred embodiment of the present invention, the soaking time is 15 to 30 minutes.

[0020] In a preferred embodiment of the present invention, the molar concentration of the perchloric acid solution is 0.5 to 2 mol / L.

[0021] The present invention also provides a wood-based self-supporting flexible electrode material for energy storage, which is prepared by the preparation method described above.

[0023] The beneficial effects of this invention are as follows: the wood-based self-supporting flexible electrode material described in this invention has low twist and an ordered conduction path, enabling simultaneous and better rapid ion diffusion and rapid charge conduction. Directional microchannel carbon materials were prepared by carbonizing delignin-treated poplar wood chips. The delignin-treated wood-based carbon materials possess a large interductal lumen and a uniquely arranged microchannel structure, exhibiting good flexibility and significantly improving cycling stability and first-efficiency. Attached Figure Description

[0024] Figure 1 This is a SEM image of the wood-based self-supporting flexible electrode material for energy storage prepared in Example 1. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0027] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0028] In this application, there are no particular restrictions on the specific dispersion and mixing methods.

[0029] Unless otherwise specified, all components, raw materials, or instruments used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0030] The following embodiments are provided to facilitate understanding of the invention. These embodiments are not intended to limit the scope of the claims.

[0031] Example 1

[0032] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0033] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0034] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0035] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0036] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0037] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0038] The SEM image of the wood-based self-supporting flexible electrode material prepared in Example 1 is shown below. Figure 1 As shown.

[0039] Example 2

[0040] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0041] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0042] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0043] (3) Add 0.25 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0044] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0045] Example 3

[0046] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0047] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0048] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0049] (3) Add 1 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0050] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0051] Example 4

[0052] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0053] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0054] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0055] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 600°C at a heating rate of 1°C / min for carbonization for 4 hours to obtain the precursor.

[0056] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0057] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0058] Example 5

[0059] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0060] (1) Prepare a sodium chlorite solution with a mass concentration of 5% and adjust the pH to 4 with a 1 mol / L hydrochloric acid solution;

[0061] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0062] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0063] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0064] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0065] Comparative Example 1

[0066] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0067] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0068] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0069] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0070] (3) Add 0.1 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0071] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0072] Comparative Example 2

[0073] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0074] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0075] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0076] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0077] (3) Add 2 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0078] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0079] Comparative Example 3

[0080] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0081] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0082] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0083] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 500°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0084] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0085] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0086] Comparative Example 4

[0087] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0088] (1) Prepare a sodium chlorite solution with a mass concentration of 5%, and adjust the pH to 5 with a 1 mol / L hydrochloric acid solution;

[0089] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0090] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 1000°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0091] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0092] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0093] Comparative Example 5

[0094] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0095] (1) Prepare a sodium chlorite solution with a mass concentration of 5% and adjust the pH to 3 with a 1 mol / L hydrochloric acid solution;

[0096] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0097] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0098] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0099] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0100] Comparative Example 6

[0101] A method for preparing a wood-based self-supporting flexible electrode material for energy storage includes the following steps:

[0102] (1) Prepare a sodium chlorite solution with a mass concentration of 5% and adjust the pH to 7 with a 1 mol / L hydrochloric acid solution;

[0103] Add poplar wood slices (cut along the growth direction of the poplar wood) to a boiling sodium chlorite solution and boil until the poplar wood slices turn completely white. Rinse off any remaining chemicals with deoxygenated water.

[0104] (2) Place poplar wood chips in a tube furnace, introduce argon gas, heat to 400°C at a heating rate of 5°C / min, and then heat to 800°C at a heating rate of 1°C / min for carbonization for 2 hours to obtain the precursor.

[0105] (3) Add 0.5 mmol of aniline and 12.5 mL of ethanol to 50 mL of 1 mol / L perchloric acid solution and stir until homogeneous to obtain the first mixture; add 0.025 mol of ammonium persulfate to 1 mol / L perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution.

[0106] (4) The precursor was soaked in the modified liquid for 20 minutes, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

[0107] Test case

[0108] 1. EIS (mΩ) test procedure:

[0109] ① Assemble a three-electrode system (working electrode: wood-based self-supporting flexible electrode material; counter electrode: platinum sheet; reference electrode: Ag / AgCl);

[0110] ②The electrolyte is 1MDC:DEC:DMC = 1:1:1, with a frequency range of 0.01Hz-100kHz and an amplitude of 10mV;

[0111] ③ Fit the charge transfer resistance (semicircle diameter) and ion diffusion resistance (slope in the low-frequency region) using Nyquist plots.

[0112] 2.D Li+ (10 -10 cm 2 / s -1 )calculate

[0113] method:

[0114] ①Geostatic intermittent titration (GITT): Apply a pulse current of 0.1 A / g, record the voltage relaxation curve, and calculate the diffusion coefficient;

[0115] ②EIS low-frequency slope method: Derive DLi+ using Warburg impedance slope.

[0116] 3. Capacity retention rate (%)

[0117] step:

[0118] ① Constant current charge-discharge (GCD) cycle test, current density 1A / g, 1700 cycles;

[0119] ② Capacity retention rate = (Nth discharge capacity / First discharge capacity) × 100%.

[0120] 4. First-efficacy (%) test

[0121] step:

[0122] ① Initial charge / discharge current density: 0.1 A / g;

[0123] ② Initial efficiency = (first discharge capacity / first charge capacity) × 100%.

[0124] Table 1

[0125]

[0126] As shown in Table 1, the wood-based self-supporting flexible electrode material of this invention has low twist and an ordered conduction path, enabling simultaneous and better rapid ion diffusion and charge conduction. Directional microchannel carbon materials were prepared by carbonizing delignin-treated poplar wood chips. The delignin-treated wood-based carbon materials possess large inter-tube lumens and a unique microchannel arrangement structure, exhibiting good flexibility and significantly improving cycling stability and first-efficiency.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a wood-based self-supporting flexible electrode material for energy storage, characterized in that, Includes the following steps: (1) Add poplar wood slices to sodium chlorite solution and boil until the poplar wood slices turn completely white, then rinse with deoxygenated water; (2) Place poplar wood chips in a tube furnace and heat them to 380-420°C at the first heating rate, and then heat them to 600-800°C at the second heating rate to carbonize them, thereby obtaining the precursor. (3) Add aniline and ethanol to the perchloric acid solution and stir until homogeneous to obtain the first mixture; add ammonium persulfate to the perchloric acid solution to obtain the second mixture; stir the first mixture and the second mixture until homogeneous to obtain the modified solution; (4) The precursor is soaked in the modified liquid, washed, and dried to obtain a wood-based self-supporting flexible electrode material for energy storage.

2. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The sodium chlorite solution has a sodium chlorite mass concentration of 4-10% and a pH of 4-5, which is adjusted to 4-5 by acid.

3. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The first heating rate is 4 to 6 °C / min.

4. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The second heating rate is 0.5 to 2 °C / min.

5. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The carbonization time is 2 to 4 hours.

6. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The ratio of aniline, ethanol, and perchloric acid solution used is (0.1-2) mmol: (10-15) mL: (40-100) mL.

7. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The soaking time is 15 to 30 minutes.

8. The method for preparing the wood-based self-supporting flexible electrode material for energy storage according to claim 1, characterized in that, The molar concentration of the perchloric acid solution is 0.5–2 mol / L.

9. A wood-based self-supporting flexible electrode material for energy storage, characterized in that, It is prepared by any one of the preparation methods described in claims 1 to 8.

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