Electrode sheet, electrode, and method for manufacturing the same

Abstract

The present application relates to a kind of electrode sheet, electrode and its manufacturing method.The present application is by being provided with flow channel on electrode body, and make flow channel from the side surface of electrode body extend to the inside of electrode body, this flow channel setting mode makes electrolyte flow in the process of flow channel into the inside of electrode, make full use of the outer surface and inner surface of electrode body simultaneously to the electrolyte flowing through electrode and carry out reaction, increase reaction area, improve the utilization of electrolyte, and by being provided with flow channel in the both sides of electrode body, make electrolyte can flow from one side of electrode body into the other side, flow out, while using the inner surface of electrode body and carrying out reaction, improve the diffusion speed of electrolyte in electrode body, it is favorable to reduce the concentration difference polarization of liquid flow battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid flow battery, in particular to an electrode sheet, an electrode and a manufacturing method thereof. BACKGROUND

[0002] At present, the global energy problem is becoming more and more serious, and vigorously developing renewable energy such as wind energy, solar energy, tidal energy and the like is the main development direction of future energy storage field. As a new type of stable energy storage battery technology, the all-vanadium redox flow battery has outstanding advantages such as adjustable capacity and power, safe operation, easy operation and maintenance, long service life, no environmental pollution, and therefore has been widely concerned in the world.

[0003] The positive and negative electrodes of the liquid flow battery both use ion solutions with different valence states as active substances and are respectively stored in the electrolyte storage tanks, and the electrolyte is pumped into the battery by an external pump to carry out the oxidation-reduction reaction. The electrode, as one of the important components of the liquid flow battery, is the main place for the oxidation-reduction reaction of different valence ions in the electrolyte.

[0004] The commonly used electrode material of the liquid flow battery 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 liquid flow battery itself, there is a high concentration polarization in the battery during operation, which affects the battery efficiency.

[0005] In the related art, the liquid flow battery usually reduces the concentration polarization by setting flow channels on the surface of the electrode, but causes the electrolyte flow to be too fast, which cannot be fully reacted, resulting in low utilization rate of the electrolyte.

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

[0007] The purpose of the present application is to provide an electrode sheet, an electrode and a manufacturing method thereof, which can improve the utilization rate of the electrolyte and improve the battery performance while improving the diffusion speed of the electrolyte.

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

[0009] The present application provides an electrode, which comprises an electrode body and a flow channel, wherein the flow channel is arranged on the electrode body, and the flow channel extends from one side surface of the electrode body to the inside of the electrode body.

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

[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 provided 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 provided 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, the ratio of the spacing between adjacent first flow channels to the 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 the 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 the 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 being 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 provides a flow channel on the electrode body, and extends the flow channel from one side surface of the electrode body to the interior of the electrode body. This flow channel arrangement allows the electrolyte to flow into the interior of the electrode along the flow channel during the flow process, fully utilizing the outer and inner surfaces 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. The present invention forms an electrode body by forming the first electrode sheet and the second electrode sheet, 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 more quickly from the second electrode sheet to the first electrode sheet.

[0034] 5. The present invention processes flow channels on the surfaces to be pressed together 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 Schematic diagram of the structure of the electrode in a partial perspective view 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 Schematic diagram of electrodes being pressed together during manufacturing.

[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 with reference to 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] The embodiment of the present invention provides an electrode, referring to Figure 1 The electrode includes: 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. The one side surface surrounded by the first edge and the third edge is the flow channel setting surface 3, and 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 by methods including but not limited to directly penetrating into the carbon felt pores, directly flowing into the flow channel 2, or first flowing into the flow channel 2 and then penetrating 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 promoting sufficient reaction of the electrolyte.

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

[0047] In some specific embodiments, the electrode body 1 may be in a cube, cylinder, or ellipsoidal shape, 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 both 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 both 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 flow channel 2 on one side surface of the electrode body 1, flows into the other flow channel 2 through the position where the flow channels 2 inside the electrode body 1 are interconnected, 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 in opposite directions. For example, they can 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 both 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 other specific embodiments, the flow channels 2 extending from both 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 interior of the electrode body 1 can be used as connecting positions, so that the electrolyte flows into one flow channel 2, passes through the entire flow channel 2 in its extension direction, enters another flow channel 2 from the end, and passes through the entire flow channel 2 again before flowing out of the electrode body 1.

[0058] In other specific embodiments, the flow channels 2 extending from both side surfaces of the electrode body 1 to the interior 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 the other 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 the end cross-section or partially overlapped in the side, 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 embodiments, the flow channels 2 extending from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 are arranged in a manner that the end cross-sectional portions or the side surface portions of the flow channels 2 on the two side surfaces of the electrode body 1 coincide with each other in the thickness direction of the electrode body 1 and partially coincide with each other in the length direction.

[0063] In other embodiments, 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 arranged in a non-parallel manner, for example, in a cross shape.

[0064] In some embodiments, the flow channels 2 extending from one side surface of the electrode body 1 to the inside 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 inside of the electrode body 1 are parallel to each other, and the flow channels 2 extending from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 are crossed with each other.

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

[0066] In some embodiments of the present application, the flow channels 2 alternately extend from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 in the arrangement direction of the flow channels 2.

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

[0068] In some embodiments, referring to Figure 1 In the perspective view perpendicular to the flow channel arrangement surface 3, the two flow channels 2 alternately extending from the two side surfaces of the electrode body 1 to the inside of the electrode body 1 partially coincide with each other in the length direction of the electrode body 1 and partially coincide with each other in the thickness direction; for example, in the extreme case, only the partial outline of the flow channels 2 coincide with each other in the thickness direction.

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

[0070] In some 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 provided 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 equal length, equal width and equal 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 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 respectively provided 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, from a perspective 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, a 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 distance between adjacent first flow channels 201 to the width of the first flow channels 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 its arrangement direction 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 flow channel 201 and the surface of the first electrode sheet 101 in its arrangement direction is a second distance L2, and the ratio of the second distance L2 to the width of the flow 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 enclosed 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 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 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 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 enclosed 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 structural shape of the electrode sheet can be the structural 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 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 process 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 ultrasonically washes it for 30 minutes using an ultrasonic cleaner; then, the carbon felt is placed in a 2 mol / L H2SO4 solution and immersed 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 multiple times until it is neutral, and placed in a vacuum drying oven and dried at 80°C for 12 hours.

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

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

[0110] In some embodiments of the present invention, after step S04 , the further step 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

[0112] Immerse the carbon felt in deionized water and ultrasonically clean it for 30 minutes. Then, soak it in a 2 mol / L H₂SO₄ solution at 60°C for 1 hour to remove surface and internal impurities. Remove the carbon felt, rinse it repeatedly with deionized water until neutral, and dry it in a vacuum drying oven at 80°C for 12 hours. Cut the cleaned carbon felt into pieces with a short side of 4.3 cm, a long side of 6 cm, and a thickness of 3.5 mm. Lay it flat on a clean work surface and, starting from the long side of the upward-facing surface, cut the first channel. The channel width A is 0.5 cm, and the distance L3 from the channel to the short side of the carbon felt is equal to 0.5 cm. The channel is wavy and has a maximum depth of 0.2 cm. Cut until the distance L1 from the end of the channel to the other long side is 1 cm. Then, the second flow channel is processed starting 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.

[0113] Example 2

[0114] The carbon felt was cleaned by immersing it in deionized water and washing it with an ultrasonic cleaner for 30 min. Then, the carbon felt was immersed in a 2 mol / L H2SO4 solution and soaked at a constant temperature of 60°C for 1 h to remove impurities on the surface and inside of the carbon felt. The carbon felt was taken out, washed with deionized water until it was neutral, and then placed in a vacuum drying oven and dried at 80°C for 12 h. The cleaned carbon felt was cut into a size of 4.3 cm in short side, 6 cm in long side, and 3.5 mm in thickness, and placed flat on a clean processing table. The first flow channel was cut and processed from the long side of the upward-facing surface, with a flow channel width A of 0.5 cm, a flow channel to short side distance L3 of 0.5 cm (one flow channel width), a wave-shaped flow channel, a maximum processing depth of 0.2 cm, and a flow channel end to the other long side distance L1 of 1 cm. Then, the second flow channel was processed from the long side, with the same processing method as the first flow channel, and a flow channel spacing D of 1 cm (two flow channel widths), until all flow channels were processed. Another carbon felt was processed in the same way as the previous carbon felt, except that the first flow channel from the long side to the short side had a distance L2 of 1 cm (two flow channel widths). The two carbon felts were pressed together with the flow channels facing each other to obtain the electrode.

[0115] Comparative Example 1

[0116] An electrode in the related art was made from carbon felt material with the same size and shape as the electrode described in Example 2, except that there was no flow channel.

[0117] Examples 1, 2, and Comparative Example 1 each provided the above electrode sheet, the above electrode, and the electrode without a flow channel in the related art, and each was made into a flow battery with a compression ratio of 25-35% and then tested for constant current charge and discharge at a condition of 140 mA / cm2. Energy efficiency data, coulomb efficiency data, and voltage efficiency data were obtained for Examples 1, 2, and Comparative Example 1, respectively, under the same technical specifications. See Table 1 for specific values.

[0118] Table 1

[0119] 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%

[0120] Examples 1, 2, and Comparative Example 1 were each tested as electrodes for a flow battery, and it was found that the performance of the flow battery was significantly improved.

[0121] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. An electrode, characterized in that include: Electrode body (1); A flow channel (2) is provided on the electrode body (1); The flow channel (2) extends from a side surface of the electrode body (1) to the interior of the electrode body (1); the electrode body (1) comprises 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); the flow channel (2) comprises a first flow channel (201) and a second flow channel (202) respectively arranged on the first electrode sheet (101) and the second electrode sheet (102); in the arrangement direction of the flow channel (2), the first flow channel (201) ) and the edge of the second flow channel (202) are bordered, including partial overlap in the length direction of the electrode body (1), or partial overlap in the thickness direction; the edges of the first flow channel (201) and the second flow channel (202) are bordered, so that the adjacent first flow channels (201) and the second flow channels (202) are connected in pairs, and the electrolyte flows into the first electrode sheet (101), flows through the first flow channel (201) and the second flow channel (202), and then flows out from the second electrode sheet (102), so that the concentration difference of the electrolyte between the two areas of the first electrode sheet (101) and the second electrode sheet (102) is more evenly distributed.

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 both 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 both 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 In the arrangement direction of the flow channels (2), the first flow channels (201) are located between adjacent second flow channels (202).

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

5.

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

25.

9. The electrode according to claim 1, 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.

10. The electrode according to claim 1, 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.

11. The electrode according to claim 1, 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.

12. An electrode sheet, characterized in that: Used to form the electrode according to any one of claims 1 to 11, the electrode sheet comprising: Surface to be pressed; A flow channel (2) is provided on the surface to be pressed; Wherein, the flow channel (2) extends to one side edge of the surface to be pressed.

13. A method for manufacturing an electrode, characterized in that: For manufacturing the electrode according to any one of claims 1 to 11, 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 one side edge 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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