Electrode plate, electrode and manufacturing method thereof

Abstract

The invention relates to an electrode plate, an electrode and a manufacturing method thereof. The flow channel is formed in the electrode body and extends into the electrode body from the surface of one side of the electrode body, so that electrolyte can flow into the electrode along with the flow channel in the flowing process; the outer surface and the inner surface of the electrode body are fully utilized to react with electrolyte flowing through the electrode at the same time, the reaction area is increased, the utilization rate of the electrolyte is increased, and the flow channels are formed in the two sides of the electrode body so that the electrolyte can flow in from one side of the electrode body and flow out from the other side of the electrode body. When the inner surface of the electrode body is used for reaction, the diffusion speed of the electrolyte in the electrode body is improved, and the concentration polarization of the flow battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow batteries, and in particular to an electrode sheet, an electrode and a manufacturing method thereof. Background Art

[0002] At present, the global energy problem is becoming more and more serious. The major development direction of energy storage in the future is to vigorously develop renewable energy such as wind energy, solar energy, and tidal energy. As a new and stable energy storage battery technology, all-vanadium liquid flow battery has outstanding advantages such as adjustable capacity and power, safe operation, easy operation and maintenance, long service life, and no environmental pollution. Therefore, it has received widespread attention worldwide.

[0003] The positive and negative electrodes of the flow battery both use ion solutions of different valence states as active materials, which are stored in their own electrolyte storage tanks. The electrolyte is pumped into the battery through an external pump for redox reactions. As one of the important components of the flow battery, the electrode is the main place for redox reactions of ions of different valence states in the electrolyte.

[0004] The common electrode material for flow batteries is carbon felt electrode, which has the advantages of high temperature resistance, corrosion resistance, and good conductivity. However, due to the structural characteristics of the flow battery itself, there is a high concentration polarization inside the battery during operation, which affects the battery efficiency.

[0005] In the related art, liquid flow batteries usually reduce concentration polarization by setting flow channels on the electrode surface, but this causes the electrolyte flow rate to be too fast, which prevents a full reaction and results in low electrolyte utilization.

[0006] Therefore, it is necessary to develop a new type of electrode sheet, electrode and manufacturing method thereof to improve some of the above-mentioned problems existing in the related art. Summary of the invention

[0007] The object of the present invention is to provide an electrode sheet, an electrode and a method for manufacturing the same, which can improve the utilization rate of the electrolyte while increasing the diffusion rate of the electrolyte, thereby improving the battery performance.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] The present invention provides an electrode, comprising: an electrode body and a flow channel; the flow channel is arranged on the electrode body; wherein the flow channel extends from a side surface of the electrode body to the interior of the electrode body.

[0010] Optionally, at least two of the flow channels are arranged in parallel, and the flow channels extend from two side surfaces of the electrode body to the interior of the electrode body respectively.

[0011] Optionally, the flow channels extend alternately from both side surfaces of the electrode body to the interior of the electrode body in the arrangement direction thereof.

[0012] Optionally, a first distance is left between the end of the flow channel and the other side surface of the electrode body in the extension direction thereof.

[0013] Optionally, a ratio of the first distance to the flow channel width is 1.5 to 2.5.

[0014] Optionally, the electrode body includes a first electrode sheet and a second electrode sheet pressed together, and the flow channel is arranged on the pressed surface of the first electrode sheet or the second electrode sheet.

[0015] Optionally, the flow channel includes a first flow channel and a second flow channel respectively arranged on the first electrode sheet and the second electrode sheet.

[0016] Optionally, in the arrangement direction of the flow channels, the first flow channels are located between adjacent second flow channels.

[0017] Optionally, in the arrangement direction of the flow channels, a ratio of a distance between the first flow channel and the surface of the electrode body to a distance between the second flow channel and the surface of the electrode body is 1.5 to 2.5.

[0018] Optionally, a width ratio of the first flow channel to the second flow channel is 0.75 to 1.25.

[0019] Optionally, a ratio of a spacing between adjacent first flow channels to a width of the first flow channels is 1.5 to 2.5.

[0020] Optionally, the minimum distance between the first flow channel and the surface of the first electrode sheet in the arrangement direction thereof is a second distance, and a ratio of the second distance to the flow channel width is 1.5 to 2.5.

[0021] Optionally, the minimum distance between the second flow channel and the surface of the second electrode sheet in the arrangement direction thereof is a third distance, and a ratio of the third distance to the flow channel width is 0.75 to 1.25.

[0022] Optionally, the flow channel is wavy.

[0023] The present invention provides an electrode sheet for a composite electrode, the electrode sheet comprising: a flow channel, the flow channel is arranged on a surface to be pressed, wherein the flow channel extends to a side edge of the surface to be pressed.

[0024] The present invention provides a method for manufacturing an electrode, which comprises the following steps:

[0025] providing a first electrode sheet;

[0026] Processing a flow channel on the surface to be pressed of the first electrode sheet, wherein the flow channel extends to one side edge of the surface to be pressed;

[0027] providing a second electrode sheet;

[0028] The second electrode sheet is pressed onto the surface to be pressed on the first electrode sheet.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention arranges a flow channel on the electrode body, and extends the flow channel from one side surface of the electrode body to the inside of the electrode body. This flow channel arrangement allows the electrolyte to flow into the electrode along the flow channel during the flow process, fully utilizing the outer surface and inner surface of the electrode body to react with the electrolyte flowing through the electrode at the same time, thereby increasing the reaction area and improving the utilization rate of the electrolyte.

[0031] 2. The present invention provides flow channels on both sides of the electrode body so that the electrolyte can flow in from one side of the electrode body and out from the other side. While utilizing the inner surface of the electrode body for reaction, the diffusion rate of the electrolyte in the electrode body is increased, which is beneficial to reducing the concentration polarization of the liquid flow battery.

[0032] 3. In the present invention, the first electrode sheet and the second electrode sheet form an electrode body, and the first flow channel and the second flow channel are respectively arranged on the surfaces of the first electrode sheet and the second electrode sheet that are pressed together. The edges of the first flow channel and the second flow channel are bordered so that the adjacent first flow channels and the second flow channels are connected to each other. The electrolyte flows in at the first electrode sheet, flows through the first flow channel and the second flow channel, and then flows out from the second electrode sheet. On the basis of reducing the flow resistance of the electrolyte, the concentration difference distribution of the electrolyte between the two areas of the first electrode sheet and the second electrode sheet is made more uniform.

[0033] 4. The present invention sets the flow channel shape to be wavy. The wavy undulating structure of the flow channel contour surface can provide a force from the first electrode sheet to the second electrode sheet, or from the second electrode sheet to the first electrode sheet when the electrolyte flows, so that the electrolyte can flow more quickly from one side of the first electrode sheet to the second electrode sheet, or from the second electrode sheet to the first electrode sheet.

[0034] 5. The present invention processes flow channels on the surfaces to be pressed of the first electrode sheet and the second electrode sheet, and forms a composite electrode with flow channels inside the first electrode sheet and the second electrode sheet by direct pressing. The manufacturing method is simple, effective and reliable, which is conducive to reducing the manufacturing cost of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the structure of an electrode in a partial perspective according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A schematic structural diagram of the first electrode sheet shown;

[0037] Figure 3 for Figure 1 A schematic structural diagram of the second electrode sheet shown;

[0038] Figure 4 for Figure 1 A schematic diagram of electrodes being pressed together during manufacturing is shown.

[0039] Reference numerals:

[0040] 1. Electrode body; 101. First electrode sheet; 102. Second electrode sheet; 2. Flow channel; 201. First flow channel; 202. Second flow channel; 3. Flow channel setting surface. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] An embodiment of the present invention provides an electrode, referring to Figure 1 The electrode comprises: an electrode body 1 and a flow channel 2 arranged on the electrode body 1; wherein the flow channel 2 extends from a side surface of the electrode body 1 to the interior of the electrode body 1.

[0043] In some specific embodiments, the surface where the end of the flow channel 2 is located is the flow channel setting surface 3.

[0044] In some specific embodiments, referring to Figure 1 The electrode body 1 is in the shape of a rectangular parallelepiped, and includes a first edge in the length direction, a second edge in the width direction, and a third edge in the thickness direction. A side surface surrounded by the first edge and the third edge is the flow channel setting surface 3. The flow channel 2 extends toward the interior of the electrode body 1, that is, one end of the flow channel 2 is located on the flow channel setting surface 3, and the other end is located inside the electrode body 1.

[0045] In some specific embodiments, the electrode body 1 can be made of carbon felt material, which has sufficient mechanical strength and a large surface area, and has pores inside. During the flow process, the electrolyte can flow in various ways, including but not limited to directly infiltrating into the carbon felt pores, directly flowing into the flow channel 2, or first flowing into the flow channel 2 and then infiltrating into the carbon felt pores from the surface of the flow channel 2, so as to achieve the dual effects of reducing concentration polarization and enhancing the full reaction of the electrolyte.

[0046] In some specific embodiments, the end of the flow channel 2 may also be arranged on a surface surrounded by the first edge and the second edge or a surface surrounded by the second edge and the third edge.

[0047] In some specific embodiments, the electrode body 1 may be in a cube, a cylinder, an ellipsoid, etc., and correspondingly, the flow channel setting surface 3 may be a plane or an arc surface, which is not limited in the present invention.

[0048] In some specific embodiments, the electrode can be used in a flow battery or other types of batteries, which is not limited in the present invention.

[0049] In some embodiments of the present invention, referring to Figure 1 At least two of the flow channels 2 are arranged in parallel, and the flow channels 2 extend from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 respectively.

[0050] In some specific embodiments, one end of the two flow channels 2 is located on the two side surfaces of the electrode body 1 , and the other end is located inside the electrode body 1 .

[0051] In some specific embodiments, the two flow channels 2 are interconnected inside the electrode body 1, so that the electrolyte flows into one of the flow channels 2 on one side surface of the electrode body 1, flows into another flow channel 2 through the interconnected position between the flow channels 2 inside the electrode body 1, and finally flows out from the other side surface of the electrode body 1.

[0052] In some specific embodiments, referring to Figure 1 , the surfaces of the flow channels 2 on both sides of the electrode body 1 face away from each other. For example, they may be two surfaces on both sides of the rectangular electrode body 1 formed by the first edge and the third edge.

[0053] In some specific embodiments, the four flow channels 2 are respectively located on four side surfaces of the electrode body 1 .

[0054] In some specific embodiments, the four flow channels 2 are connected in pairs or all four are connected.

[0055] In some specific embodiments, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 may be connected in a manner that the end sections completely overlap.

[0056] In some other specific embodiments, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 may also be connected in a manner that the end cross-sections of the flow channels 2 partially overlap.

[0057] In some specific embodiments, the ends of the flow channels 2 extending from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 can be used as connecting positions, so that after the electrolyte flows into one of the flow channels 2, it passes through the entire flow channel 2 in its extension direction, enters another flow channel 2 from the end, and flows out of the electrode body 1 after passing through the entire flow channel 2 again.

[0058] In some other specific embodiments, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 may also be connected in a manner that the side surfaces of the flow channels 2 partially overlap.

[0059] In some specific embodiments, referring to Figure 1 , respectively extending from the two side surfaces of the electrode body 1 to the flow channels 2 inside the electrode body 1, the side of the flow channel 2 can be used as a connecting position, so that after the electrolyte flows into one of the flow channels 2, part of the electrolyte does not pass through the entire flow channel 2 in its extension direction, and flows into another flow channel 2 from the side of one of the flow channels 2 in advance, and finally flows out of the electrode body 1.

[0060] In some specific embodiments, referring to Figure 1 , from a perspective perpendicular to the flow channel setting surface 3, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 are partially overlapped in end cross-section or side cross-section, including partial overlap in the length direction of the electrode body 1 and partial overlap in the thickness direction.

[0061] In other specific embodiments, from a perspective perpendicular to the flow channel setting surface 3, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 are partially overlapped at the end sections or partially overlapped at the side sections, including complete overlap in the length direction of the electrode body 1 and partial overlap in the thickness direction.

[0062] In other specific embodiments, from a perspective perpendicular to the flow channel setting surface 3, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 are partially overlapped at the end sections or partially overlapped at the sides, including complete overlap in the thickness direction of the electrode body 1 and partial overlap in the length direction.

[0063] In some other specific embodiments, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 may not be arranged in parallel, and illustratively, may be in a cross shape.

[0064] In some specific embodiments, the flow channels 2 extending from one side surface of the electrode body 1 to the interior of the electrode body 1 are parallel to each other, the flow channels 2 extending from the other side surface of the electrode body 1 to the interior of the electrode body 1 are parallel to each other, and the flow channels 2 extending from both side surfaces of the electrode body 1 to the interior of the electrode body 1 cross each other.

[0065] In some specific embodiments, the arrangement direction of the flow channels 2 may be the length direction of the electrode body 1 .

[0066] In some embodiments of the present invention, the flow channels 2 extend alternately from both side surfaces of the electrode body 1 to the interior of the electrode body 1 in the arrangement direction thereof.

[0067] In some specific embodiments, in the arrangement direction of the flow channels 2, the first flow channel 2 extends from one side surface of the electrode body to the interior of the electrode body 1, and the second flow channel 2 extends from the other side of the electrode body to the interior of the electrode body 1.

[0068] In some specific embodiments, referring to Figure 1 , from a perspective perpendicular to the flow channel setting surface 3, the two flow channels 2 extending alternately from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 partially overlap in the length direction of the electrode body 1 and partially overlap in the thickness direction; illustratively, in an extreme case, only part of the contour lines of the flow channels 2 overlap in the thickness direction.

[0069] In some specific embodiments, in the arrangement direction of the flow channels 2 , the flow channels 2 are arranged in groups of two, and extend alternately from the two side surfaces of the electrode body 1 to the interior of the electrode body 1 .

[0070] In some specific embodiments, referring to Figure 1In the arrangement direction of the flow channels 2, the first and second flow channels 2 are a group extending from one side surface of the electrode body to the interior of the electrode body 1, and the third and fourth flow channels 2 are a group extending from the other side of the electrode body to the interior of the electrode body 1.

[0071] In some specific embodiments, from a perspective perpendicular to the flow channel setting surface 3, the flow channels 2 in groups of two do not overlap in the thickness direction.

[0072] In some embodiments of the present invention, referring to Figure 2 and Figure 3 A first distance L1 is left between the end of the flow channel 2 and the other side surface of the electrode body 1 in its extending direction.

[0073] In some embodiments of the present invention, the ratio of the first distance L1 to the width of the flow channel 2 is 1.5 to 2.5.

[0074] In some specific embodiments, the ratio of the first distance L1 to the width of the flow channel 2 is 1.5, 1.75, 2, 2.25 or 2.5 times.

[0075] In some embodiments of the present invention, referring to Figure 2 and Figure 3 The electrode body 1 includes a first electrode sheet 101 and a second electrode sheet 102 pressed together, and the flow channel 2 is arranged on the pressed surface of the first electrode sheet 101 or the second electrode sheet 102 .

[0076] In some specific embodiments, referring to Figure 1 The first electrode sheet 101 and the second electrode sheet 102 have the same length, width and thickness.

[0077] In some specific embodiments, the thickness of the first electrode sheet 101 and the second electrode sheet 102 is half of the thickness of the electrode body.

[0078] In some specific embodiments, referring to Figure 1 and Figure 4 The first electrode sheet 101 and the second electrode sheet 102 are pressed together in such a way that the surfaces to be pressed together completely overlap.

[0079] In some specific embodiments, the flow channel 2 is only provided on the first electrode sheet 101 , and the inner surface of the flow channel 2 and the surface to be pressed on the second electrode sheet 102 together form a flow path for the electrolyte.

[0080] In some other specific embodiments, the flow channel 2 is only provided on the second electrode sheet 102 , and the inner surface of the flow channel 2 and the surface to be pressed on the first electrode sheet 101 together form a flow path for the electrolyte.

[0081] In some embodiments of the present invention, referring to Figure 2 and Figure 3 The flow channel 2 includes a first flow channel 201 and a second flow channel 202 which are respectively arranged on the first electrode sheet 101 and the second electrode sheet 102 .

[0082] In some specific embodiments, referring to Figure 1 , Figure 2 and Figure 3 The first flow channel 201 and the second flow channel 202 are respectively located on the surfaces to be pressed of the first electrode sheet 101 and the second electrode sheet 102. After the first electrode sheet 101 and the second electrode sheet 102 are pressed together, the aforementioned extreme situation is formed, that is, in a perspective angle perpendicular to the flow channel setting surface 3, the flow channels 2 partially overlap in the length direction of the electrode body 1, and only partially overlap in the thickness direction.

[0083] In some embodiments of the present invention, referring to Figure 1 , Figure 2 and Figure 3 In the arrangement direction of the flow channels 2 , the first flow channels 201 are located between adjacent second flow channels 202 .

[0084] In some embodiments of the present invention, referring to Figure 1 In the arrangement direction of the flow channels 2 , the edges of the first flow channel 201 and the second flow channel 202 are adjacent to each other, so that the electrode liquid can flow between the first flow channel 201 and the second flow channel 202 .

[0085] In some embodiments of the present invention, in the arrangement direction of the flow channels 2, the ratio of the distance between the first flow channels 201 and the surface of the electrode body 1 to the distance between the second flow channels 202 and the surface of the electrode body 1 is 1.5 to 2.5.

[0086] In some specific embodiments, in the arrangement direction of the flow channels 2, the ratio of the distance between the first flow channels 201 and the surface of the electrode body 1 to the distance between the second flow channels 202 and the surface of the electrode body 1 is 1.5, 1.75, 2, 2.25 or 2.5.

[0087] In some embodiments of the present invention, the width ratio of the first flow channel 201 to the second flow channel 202 is 0.75 to 1.25.

[0088] In some specific embodiments, the width ratio of the first flow channel 201 to the second flow channel 202 is 0.75, 1 or 1.25.

[0089] In some specific embodiments, referring to Figure 2 and Figure 3 , the width of the first flow channel 201 and the second flow channel 202 are both A.

[0090] In some embodiments of the present invention, the ratio of the distance between adjacent first flow channels 201 to the width of the first flow channels 201 is 1.5 to 2.5.

[0091] In some specific embodiments, the ratio of the interval between adjacent first flow channels 201 to the width of the first flow channel 201 is 1.5 to 2.5.

[0092] In some specific embodiments, referring to Figure 2 and Figure 3 , the distance between adjacent first flow channels 201 is D, and the distance D between adjacent first flow channels 201 is equal to the distance between adjacent second flow channels 202.

[0093] In some embodiments of the present invention, referring to Figure 2 The minimum distance between the first flow channel 201 and the surface of the first electrode sheet 101 in the arrangement direction thereof is a second distance L2, and the ratio of the second distance L2 to the width of the flow channel 2 is 1.5 to 2.5.

[0094] In some specific embodiments, the minimum distance between the first channel 201 and the surface of the first electrode sheet 101 in the arrangement direction is a second distance L2, and the ratio of the second distance L2 to the width of the channel 2 is 1.5, 1.75, 2, 2.25 or 2.5.

[0095] In some specific embodiments, referring to Figure 2 At least two of the first flow channels 201 are arranged along the length direction of the first electrode sheet 101, and the second distance L2 is the distance between the first or last first flow channel 201 and the surface surrounded by the second edge and the third edge.

[0096] In some embodiments of the present invention, referring to Figure 3 The minimum distance between the second flow channel 202 and the surface of the second electrode sheet 102 in the arrangement direction thereof is a third distance L3, and the ratio of the third distance L3 to the width of the flow channel 2 is 0.75 to 1.25.

[0097] In some specific embodiments, the minimum distance between the second flow channel 202 and the surface of the second electrode sheet 102 in the arrangement direction thereof is a third distance L3, and the ratio of the third distance L3 to the width of the flow channel 2 is 0.75, 1 or 1.25.

[0098] In some specific embodiments, referring to Figure 3 At least two of the second flow channels 202 are arranged along the length direction of the second electrode sheet 102, and the third distance L3 is the distance between the first or last second flow channel 202 and the surface surrounded by the second edge and the third edge.

[0099] In some embodiments of the present invention, the positions and shapes of the first flow channel 201 and the second flow channel 202 may be the same or different.

[0100] The embodiment of the present invention provides an electrode sheet of a composite electrode, referring to Figure 2 and Figure 3 , used to synthesize a composite electrode, the electrode sheet structure shape can be the structure shape of the first electrode sheet 101 or the second electrode sheet 102, the electrode sheet includes a surface to be pressed, and the flow channel 2 is arranged on the surface to be pressed; wherein, the flow channel 2 extends to one side edge of the surface to be pressed.

[0101] An embodiment of the present invention provides a method for manufacturing an electrode, comprising the following steps:

[0102] S01: providing a first electrode sheet 101;

[0103] S02: processing a flow channel 2 on the surface to be pressed of the first electrode sheet 101, wherein the flow channel 2 extends to one side edge of the surface to be pressed;

[0104] S03: providing a second electrode sheet 102;

[0105] S04: Pressing the second electrode sheet 102 onto the surface to be pressed on the first electrode sheet 101 .

[0106] In some specific embodiments, before step S01 , the method further includes: pre-processing the first electrode sheet 101 or the second electrode sheet 102 .

[0107] In some specific embodiments, the pretreatment first immerses the carbon felt material used to make the first electrode sheet 101 or the second electrode sheet 102 in deionized water and washes it ultrasonically for 30 minutes using an ultrasonic cleaner; then, the carbon felt is immersed in a 2 mol / L H2SO4 solution at a constant temperature of 60°C for 1 hour; impurities on the surface and inside of the carbon felt are removed; the carbon felt is taken out, washed with deionized water for multiple times until it is neutral, and placed in a vacuum drying oven at 80°C for 12 hours.

[0108] In some specific embodiments, step S02 includes: cutting the cleaned carbon felt into a desired size; placing it flat on a clean processing table, and performing a cutting process on a long side facing upward on the flow channel 2, wherein the processing depth is half or less of the thickness of the carbon felt, and the processing width can be freely adjusted according to requirements, and the flow channel 2 is processed into a wavy shape, and the processing is stopped until the distance from the relatively long side is twice the width of the flow channel 2; then starting from the relatively long side, the second flow channel 2 is processed in the same manner as the first flow channel 2, and the interval between the flow channels 2 is twice the width of the flow channel 2, until all the flow channels 2 are processed.

[0109] In some specific embodiments, the difference between the processing methods of the first electrode sheet 101 and the second electrode sheet 102 is that the first first channel 201 is twice the width of the channel 2 away from the short side of the carbon felt, and the first second channel 202 is once the width of the channel 2 away from the short side of the carbon felt.

[0110] In some embodiments of the present invention, after step S04, the method further includes: compressing the pressed first electrode sheet 101 and the second electrode sheet 102 at a compression ratio of 25% to 35%.

[0111] Example 1 Immerse the carbon felt in deionized water and use an ultrasonic cleaner to ultrasonically clean it for 30 minutes; then place the carbon felt in a 2mol / L H2SO4 solution at 60℃ for 1 hour to remove impurities on the surface and inside of the carbon felt. Take out the carbon felt, wash it with deionized water several times until it is neutral, and put it in a vacuum drying oven at 80℃ for 12 hours. Cut the cleaned carbon felt into a size of 4.3cm on the short side, 6cm on the long side, and 3.5mm on the thickness, lay it flat on a clean processing table, and start cutting the first flow channel from the long side on the upper side. The flow channel width A is 0.5cm, and the distance L3 from the flow channel to the short side of the carbon felt is one times the flow channel width 0.5cm. The processed flow channel is wavy, and the maximum processing depth is 0.2cm. The processing stops when the distance L1 from the end of the flow channel to the other side of the long side is 1cm. Then, the second flow channel is processed from the long side in the same manner as the first flow channel, with the flow channel spacing D being twice the flow channel width 1 cm, until all flow channels are processed to obtain the electrode sheet.

[0112] Example 2 Immerse the carbon felt in deionized water and use an ultrasonic cleaner to ultrasonically wash it for 30 minutes; then place the carbon felt in a 2mol / L H2SO4 solution at a constant temperature of 60℃ for 1 hour to remove impurities on the surface and inside of the carbon felt. Take out the carbon felt, wash it with deionized water several times until it is neutral, and put it in a vacuum drying oven at 80℃ for 12 hours. Cut the cleaned carbon felt into a size of 4.3cm on the short side, 6cm on the long side, and 3.5mm on the thickness, and lay it flat on a clean processing table. The first flow channel is cut from the long side of the upper side. The flow channel width A is 0.5cm, and the distance L3 from the flow channel to the short side of the carbon felt is one times the flow channel width 0.5cm. The processed flow channel is wavy, and the maximum processing depth is 0.2cm. The processing stops when the distance L1 from the end of the flow channel to the other side of the long side is 1cm. Then, start processing the second flow channel from the long side. The processing method is the same as the first flow channel. The flow channel spacing D is twice the flow channel width 1cm until all flow channels are processed. Another carbon felt is processed in the same manner as the previous carbon felt, except that the distance L2 from the first flow channel processed from the long side to the short side of the carbon felt is twice the flow channel width 1 cm. The two carbon felts are pressed together with their sides with flow channels to obtain the electrode.

[0113] Comparative Example 1 The electrode in the related art is made of a carbon felt material having the same size and shape as the electrode described in Example 2, except that there is no flow channel.

[0114] Example 1, Example 2 and Comparative Example 1 respectively provide the above-mentioned electrode sheet, the above-mentioned electrode and the channelless electrode in the related technology, all of which are made into liquid flow batteries with a compression ratio of 25~35%, and then subjected to constant current charge and discharge tests under the condition of 140mA / cm2. When other technical specifications are consistent, the energy efficiency data, coulomb efficiency data and voltage efficiency data of Example 1, Example 2 and Comparative Example 1 are respectively obtained. For specific values, please refer to Table 1.

[0115] Table 1 serial number Energy efficiency Coulomb efficiency Voltage efficiency Comparative Example 1 80.2% 95.7% 83.8% Example 2 81.3% 96.6% 84.2% Example 1 83.1% 97.8% 85.0%

[0116] Example 1, Example 2 and Comparative Example 1 were tested as electrodes of a flow battery, respectively, and it can be seen that the performance of the flow battery is significantly improved.

[0117] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An electrode, characterized in that: include: Electrode body (1); A flow channel (2) is arranged on the electrode body (1); Wherein, the flow channel (2) extends from a side surface of the electrode body (1) to the interior of the electrode body (1).

2. The electrode according to claim 1, characterized in that At least two of the flow channels (2) are arranged in parallel, and the flow channels (2) extend from two side surfaces of the electrode body (1) to the interior of the electrode body (1) respectively.

3. The electrode according to claim 1, characterized in that The flow channels (2) extend alternately from the two side surfaces of the electrode body (1) to the interior of the electrode body (1) in the arrangement direction thereof.

4. The electrode according to claim 1, characterized in that A first distance is left between the end of the flow channel (2) and the other side surface of the electrode body (1) in the extension direction thereof.

5. The electrode according to claim 4, characterized in that The ratio of the first distance to the width of the flow channel (2) is 1.5 to 2.

5.

6. The electrode according to claim 1, characterized in that The electrode body (1) comprises a first electrode sheet (101) and a second electrode sheet (102) which are pressed together, and the flow channel (2) is arranged on the pressed surface of the first electrode sheet (101) or the second electrode sheet (102).

7. The electrode according to claim 6, characterized in that The flow channel (2) comprises a first flow channel (201) and a second flow channel (202) which are respectively arranged on the first electrode sheet (101) and the second electrode sheet (102).

8. The electrode according to claim 7, characterized in that In the arrangement direction of the flow channels (2), the first flow channels (201) are located between adjacent second flow channels (202).

9. The electrode according to claim 7, characterized in that In the arrangement direction of the flow channels (2), the edges of the first flow channel (201) and the second flow channel (202) are adjacent to each other.

10. The electrode according to claim 7, characterized in that In the arrangement direction of the flow channels (2), the ratio of the distance between the first flow channels (201) and the surface of the electrode body (1) to the distance between the second flow channels (202) and the surface of the electrode body (1) is 1.5 to 2.

5.

11. The electrode according to claim 7, characterized in that The width ratio of the first flow channel (201) to the second flow channel (202) is 0.75 to 1.

25.

12. The electrode according to claim 7, characterized in that The ratio of the spacing between adjacent first flow channels (201) to the width of the first flow channel (201) is 1.5 to 2.

5.

13. The electrode according to claim 7, characterized in that The minimum distance between the first flow channel (201) and the surface of the first electrode sheet (101) in the arrangement direction thereof is a second distance, and the ratio of the second distance to the width of the flow channel (2) is 1.5 to 2.

5.

14. The electrode according to claim 7, characterized in that The minimum distance between the second flow channel (202) and the surface of the second electrode sheet (102) in the arrangement direction thereof is a third distance, and the ratio of the third distance to the width of the flow channel (2) is 0.75 to 1.

25.

15. An electrode sheet, characterized in that: Used to form the electrode according to any one of claims 1 to 14, the electrode sheet comprising: Surface to be pressed; A flow channel (2) is arranged on the surface to be pressed; Wherein, the flow channel (2) extends to one side edge of the surface to be pressed.

16. A method for manufacturing an electrode, characterized in that: For manufacturing an electrode according to any one of claims 1 to 14, the manufacturing method comprises the following steps: Providing a first electrode sheet (101); Processing a flow channel (2) on the surface to be pressed of the first electrode sheet (101), wherein the flow channel (2) extends to an edge of one side of the surface to be pressed; Providing a second electrode sheet (102); The second electrode sheet (102) is pressed onto the surface to be pressed on the first electrode sheet (101).

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