High-safety electrode slurry and preparation method thereof, electrode plate and battery

Abstract

The invention provides high-safety electrode slurry and a preparation method thereof, an electrode plate and a battery, and relates to the technical field of lithium ion batteries. The high-safety electrode slurry is prepared from the following raw materials in parts by weight: 95 to 105 parts of an electrode active material, 0.5 to 1.5 parts of a conductive agent, 15 to 35 parts of an additive, 1 to 2.5 parts of a binder and 10 to 30 parts of a solvent, the additive comprises a single-walled carbon nanotube solution. According to the high-safety electrode slurry, the tensile strength and the peel strength are improved on the basis that the electrochemical performance of the slurry is not influenced by the single-walled carbon nanotube solution.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a highly safe electrode slurry and a preparation method thereof, an electrode plate and a battery. Background Art

[0002] Lithium-ion batteries have excellent properties such as high voltage, high specific energy, and long cycle life, and are widely used in electric vehicles and various energy storage devices.

[0003] During daily use, due to mechanical abuse, such as heavy impact and squeezing, the battery is very easy to deform, resulting in damage to the pole pieces and diaphragms, causing internal short circuits and battery cell failure. Summary of the invention

[0004] The purpose of the present application is to provide a highly safe electrode slurry and a preparation method thereof, an electrode plate and a battery to solve the above-mentioned problems.

[0005] To achieve the above objectives, the first aspect of the present application provides a highly safe electrode slurry, the raw materials of which, by weight, include:

[0006] 95-105 parts of electrode active material, 0.5-1.5 parts of conductive agent, 15-35 parts of additive, 1-2.5 parts of binder, 10-30 parts of solvent;

[0007] The additive includes a single-walled carbon nanotube solution.

[0008] Optionally, the raw materials of the single-walled carbon nanotube solution include single-walled carbon nanotubes and a suspending agent.

[0009] Optionally, the highly safe electrode slurry satisfies at least one of the following conditions:

[0010] A. The mass ratio of the single-walled carbon nanotubes to the suspending agent is 0.5-2:20-40;

[0011] B. the suspending agent comprises one or more of N-methylpyrrolidone, polyethylene glycol octylphenyl ether, polyvinylpyrrolidone, and carboxymethylcellulose;

[0012] C. The average diameter of the single-walled carbon nanotubes is 0.7nm-2nm, the length is 10μm-35μm, and the specific surface area is 1000m 2 / g-1500m 2 / g.

[0013] Optionally, the electrode active material includes a positive electrode active material and / or a negative electrode active material.

[0014] Optionally, the highly safe electrode slurry satisfies at least one of the following conditions:

[0015] A. The electrode active material includes a positive electrode active material;

[0016] B. The positive electrode active material includes lithium nickel cobalt manganese oxide and / or lithium nickel cobalt aluminum oxide;

[0017] C. The negative electrode active material includes one or more of graphite, silicon oxide, and silicon carbon.

[0018] Optionally, the conductive agent includes carbon black.

[0019] Optionally, the highly safe electrode slurry satisfies at least one of the following conditions:

[0020] A. The binder includes one or more of polyvinylidene fluoride, sodium carboxymethyl cellulose, and styrene-butadiene rubber;

[0021] B. the solvent includes an oily solvent;

[0022] The oily solvent includes N-methylpyrrolidone.

[0023] The second aspect of the present application provides a method for preparing a highly safe electrode slurry, comprising:

[0024] The raw materials of the high-safety electrode slurry are mixed to prepare the high-safety electrode slurry.

[0025] A third aspect of the present application provides an electrode plate, comprising the high-safety electrode slurry or the high-safety electrode slurry prepared by the preparation method of the high-safety electrode slurry.

[0026] A fourth aspect of the present application provides a battery, comprising the electrode plate described above.

[0027] Compared with the prior art, the beneficial effects of this application include:

[0028] The high-safety electrode slurry provided by the present application, the single-walled carbon nanotube solution improves the tensile strength and peel strength without affecting the electrochemical properties of the slurry, wherein the active material in the electrode slurry is one of the important components, which determines the electrochemical properties of the lithium battery such as the energy density and cycle performance; the main function of the conductive agent is to improve the conductivity of the electrode slurry, reduce the impedance of the pole piece, and improve the dispersibility of the slurry; the binder is mainly used to bond the various components and pole pieces in the electrode slurry to improve the adhesion of the pole piece; the solvent is mainly used to adjust the viscosity and solid content of the electrode slurry so that the various components in the slurry are fully in contact and evenly dispersed; the present application introduces the single-walled carbon nanotube solution into the electrode slurry, interconnects with the electrode active material, and combines it in a π-π conjugated surface adsorption mode, thereby improving the interaction force between the particles, enhancing the adhesion of the slurry, improving the toughness of the pole piece, and the active material is not easy to detach. In addition, the single-walled carbon nanotube is a three-dimensional network structure with a large aspect ratio, which can be evenly dispersed between the particles of the active material, improving the dispersibility of the electrode material and further avoiding the agglomeration of the active material.

[0029] The method for preparing the highly safe electrode slurry provided in the present application is simple to operate.

[0030] The electrode plate provided by the present application has enhanced adhesion between the slurry and the plate, improved toughness of the plate, and the active material is not easy to separate. In addition, the single-walled carbon nanotube is a three-dimensional network structure with a large aspect ratio and excellent mechanical properties, which not only improves the dispersibility of the positive electrode material, further avoids the agglomeration of the active material, further reduces the plate impedance, but also improves the mechanical properties of the plate.

[0031] The battery provided in the present application has reduced material dropout of the positive electrode sheet and significantly reduced electrode sheet damage after being impacted and squeezed by heavy objects due to mechanical abuse, while the negative electrode sheet and the diaphragm are not damaged. Therefore, when impacted by heavy objects, the contact between the positive and negative electrode sheets is effectively avoided, reducing the risk of short circuit inside the battery cell and improving the safety performance of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0033] Figure 1 This is a SEM image of the positive electrode sheet after rolling provided in Example 1;

[0034] Figure 2 This is a SEM image of the positive electrode sheet after rolling provided in Example 2;

[0035] Figure 3This is a SEM image of the positive electrode sheet after rolling provided in Comparative Example 1;

[0036] Figure 4 This is a SEM image of the positive electrode sheet after rolling provided in Comparative Example 2;

[0037] Figure 5 It is a test diagram of the electrode peeling strength of Example 1-2 and Comparative Example 1-2;

[0038] Figure 6 This is a disassembled physical picture of the positive electrode sheet of the battery of Example 1 after the heavy object impact test;

[0039] Figure 7 This is a disassembled physical picture of the positive electrode sheet of the battery of Example 2 after the heavy object impact test;

[0040] Figure 8 This is a disassembled physical picture of the positive electrode sheet of the battery of Comparative Example 1 after the heavy object impact test;

[0041] Fig. 9 This is a disassembled photo of the positive electrode of the battery of comparative example 2 after the heavy object impact test. DETAILED DESCRIPTION

[0042] As used herein:

[0043] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0044] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0045] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0046] In these examples, parts and percentages are by mass unless otherwise indicated.

[0047] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0048] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0049] The first aspect of the present application provides a highly safe electrode slurry, the raw materials of which, by weight, include:

[0050] 95-105 parts of electrode active material, 0.5-1.5 parts of conductive agent, 15-35 parts of additive, 1-2.5 parts of binder, 10-30 parts of solvent;

[0051] Optionally, the raw materials of a high-safety electrode slurry are measured by weight: the electrode active material can be 95 parts, 100 parts, 105 parts or any value between 95 parts and 105 parts, the conductive agent can be 0.5 parts, 1 parts, 1.5 parts or any value between 0.5 parts and 1.5 parts, the additive can be 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or any value between 10 parts and 35 parts, the binder can be 1 part, 1.5 parts, 2 parts, 2.5 parts or any value between 1 part and 2.5 parts, and the solvent can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts or any value between 10 parts and 30 parts;

[0052] In some embodiments, a high-safety electrode slurry comprises raw materials, measured by weight, including:

[0053] 98 parts to 102 parts of electrode active material, 0.5 parts to 0.8 parts of conductive agent, 25 parts to 30 parts of additive, 1.0 parts to 1.2 parts of binder, and 12 parts to 16 parts of solvent.

[0054] It should be noted that as the amount of conductive agent added decreases, the internal resistance of the positive electrode plate increases slightly, and the heat generation in the battery cell is lower. When the amount of additive added is 25-30 parts, the tensile strength of the plate is highest. When the amount added is too much, the tensile strength of the plate is reduced due to the agglomeration of single-walled carbon nanotubes or solvent residue, and the effect of improving the heavy object impact performance of the battery cell is not obvious.

[0055] The additive includes a single-walled carbon nanotube solution.

[0056] In some embodiments, the raw materials of the single-walled carbon nanotube solution include single-walled carbon nanotubes and a suspending agent.

[0057] In some embodiments, the high-safety electrode slurry satisfies at least one of the following conditions:

[0058] A. The mass ratio of the single-walled carbon nanotubes to the suspending agent is 0.5-2:20-40;

[0059] Optionally, the mass ratio of the single-walled carbon nanotubes to the suspending agent may be 0.5:20, 1:20, 1.5:20, 2:20, 0.5:30, 0.5:40, 2:30, 2:40 or any value between 0.5-2:20-40;

[0060] B. the suspending agent comprises one or more of N-methylpyrrolidone, polyethylene glycol octylphenyl ether, polyvinylpyrrolidone, and carboxymethylcellulose;

[0061] It should be noted that N-methylpyrrolidone (NMP) is a commonly used cathode solvent, which is often used in combination with the binder PVDF to evenly disperse the components such as active materials, binders, and conductive agents;

[0062] C. The average diameter of the single-walled carbon nanotubes is 0.7nm-2nm, the length is 10μm-35μm, and the specific surface area is 1000m 2 / g-1500m 2 / g.

[0063] Optionally, the average diameter of the single-walled carbon nanotubes can be 0.7 nm, 1 nm, 1.5 nm, 2 nm or any value between 0.7 nm and 2 nm, the length can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm or any value between 10 μm and 35 μm, and the specific surface area can be 1000 m 2 / g、1100m 2 / g、1200m 2 / g、1300m 2 / g、1400m 2 / g、1500m 2 / g or 1000m 2 / g-1500m 2 Any value between / g.

[0064] In some embodiments, the electrode active material includes a positive electrode active material and / or a negative electrode active material.

[0065] In some embodiments, the high-safety electrode slurry satisfies at least one of the following conditions:

[0066] A. The electrode active material includes a positive electrode active material;

[0067] B. The positive electrode active material includes lithium nickel cobalt manganese oxide and / or lithium nickel cobalt aluminum oxide;

[0068] C. The negative electrode active material includes one or more of graphite, silicon oxide, and silicon carbon.

[0069] In some embodiments, the conductive agent includes conductive carbon black.

[0070] It should be noted that compared with other conductive agents, the particle size of conductive carbon black particles is smaller. Under the same mass, there are more conductive carbon black particles, which is beneficial to improve the conductivity between material particles and reduce the impedance of the electrode.

[0071] In some embodiments, the high-safety electrode slurry satisfies at least one of the following conditions:

[0072] A. The binder includes one or more of polyvinylidene fluoride, sodium carboxymethyl cellulose, and styrene-butadiene rubber;

[0073] B. the solvent includes an oily solvent;

[0074] The oily solvent includes N-methylpyrrolidone.

[0075] It should be noted that N-methylpyrrolidone (NMP) is a commonly used cathode solvent, which is often used in combination with the binder PVDF to evenly disperse the components such as active materials, binders, and conductive agents;

[0076] The second aspect of the present application provides a method for preparing a highly safe electrode slurry, comprising:

[0077] The raw materials of the high-safety electrode slurry are mixed to prepare the high-safety electrode slurry.

[0078] A third aspect of the present application provides an electrode plate, comprising the high-safety electrode slurry or the high-safety electrode slurry prepared by the preparation method of the high-safety electrode slurry.

[0079] A fourth aspect of the present application provides a battery, comprising the electrode plate described above.

[0080] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0081] Example 1

[0082] The first aspect of this embodiment provides a highly safe positive electrode slurry, the raw materials of which are calculated by weight:

[0083] 100 parts of positive electrode active material lithium nickel cobalt manganese oxide, 1.3 parts of conductive agent carbon black, 25 parts of additive single-walled carbon nanotube glue, 1.1 parts of binder polyvinylidene fluoride, 13 parts of solvent N-methylpyrrolidone;

[0084] The single-walled carbon nanotube solution is prepared by mixing single-walled carbon nanotubes and a suspending agent at a mass ratio of 1:24, and the suspending agent is N-methylpyrrolidone;

[0085] The average diameter of single-walled carbon nanotubes is 1.2 nm, the length is 20 μm, and the specific surface area is 1247 m 2 / g.

[0086] A second aspect of this embodiment provides a method for preparing a positive electrode slurry with high safety, which is prepared by mixing the above raw materials.

[0087] A third aspect of the present embodiment provides a positive electrode plate, comprising the above-mentioned high-safety positive electrode slurry, and is made into a plate with a size of 12×2 mm.

[0088] The fourth aspect of this embodiment provides a 18650 / 21700 cylindrical battery cell, which is assembled from the above-mentioned positive electrode plate and negative electrode plate. The negative electrode slurry of the negative electrode plate has active materials such as graphite and silicon oxide, and no single-walled carbon nanotube glue is added. Other raw materials are consistent with the positive electrode slurry.

[0089] The SEM of the positive electrode sheet after rolling provided in this embodiment is as follows Figure 1 shown.

[0090] Example 2

[0091] The first aspect of this embodiment provides a highly safe positive electrode slurry, the raw materials of which are calculated by weight:

[0092] 100 parts of positive electrode active material lithium nickel cobalt manganese oxide, 1.3 parts of conductive agent carbon black, 30 parts of additive single-walled carbon nanotube solution, 2.2 parts of binder polyvinylidene fluoride, 13 parts of solvent N-methylpyrrolidone;

[0093] The single-walled carbon nanotube solution is prepared by mixing single-walled carbon nanotubes and a suspending agent in a mass ratio of 1:24, the suspending agent is prepared by mixing N-methylpyrrolidone and carboxymethyl cellulose in a mass ratio of 1:1, and the single-walled carbon nanotubes are consistent with those in Example 1.

[0094] A second aspect of this embodiment provides a method for preparing a positive electrode slurry with high safety, which is prepared by mixing the above raw materials.

[0095] A third aspect of the present embodiment provides a positive electrode plate, comprising the above-mentioned high-safety positive electrode slurry, and is made into a plate with a size of 12×2 mm.

[0096] The fourth aspect of this embodiment provides a 18650 / 21700 cylindrical battery cell, which is assembled from the above-mentioned positive electrode plate and negative electrode plate. The negative electrode slurry of the negative electrode plate has active materials such as graphite and silicon oxide, and no single-walled carbon nanotube glue is added. Other raw materials are consistent with the positive electrode slurry.

[0097] The SEM of the positive electrode sheet after rolling provided in this embodiment is as follows Figure 2 shown.

[0098] Example 3

[0099] The first aspect of this embodiment provides a highly safe negative electrode slurry, the raw materials of which are calculated by weight:

[0100] 100 parts of negative electrode active materials graphite and silicon oxide (10 parts of silicon oxide, 90 parts of graphite), 1 part of conductive agent carbon black, 25 parts of additive single-walled carbon nanotube glue, 3 parts of binder polyvinylidene fluoride, 2 parts of solvent N-methylpyrrolidone, 87 parts of water;

[0101] The single-walled carbon nanotube solution is prepared by mixing single-walled carbon nanotubes and a suspending agent in a mass ratio of 1:24, the suspending agent is prepared by mixing N-methylpyrrolidone and carboxymethyl cellulose in a mass ratio of 1:1, and the single-walled carbon nanotubes are consistent with those in Example 1.

[0102] A second aspect of this embodiment provides a method for preparing a negative electrode slurry with high safety, which is prepared by mixing the above raw materials.

[0103] A third aspect of this embodiment provides a negative electrode plate, comprising the above-mentioned high-safety negative electrode slurry.

[0104] The fourth aspect of this embodiment provides a 18650 / 21700 cylindrical battery, which is assembled from the above-mentioned negative electrode plate and positive electrode plate. The positive electrode slurry of the positive electrode plate has the same raw materials as the negative electrode slurry except that the active material is lithium nickel cobalt manganese oxide and no single-walled carbon nanotubes are added.

[0105] Comparative Example 1

[0106] This comparative example provides a positive electrode slurry and a preparation method thereof, a positive electrode plate and a battery. The difference from Example 1 is that the positive electrode slurry of this comparative example and the negative electrode slurry of the negative electrode plate in the battery do not add single-walled carbon nanotube solution.

[0107] The SEM of the positive electrode sheet after rolling provided in this comparative example is as follows Figure 3 shown.

[0108] Comparative Example 2

[0109] This comparative example provides a positive electrode slurry and a preparation method thereof, a positive electrode plate and a battery. The difference from comparative example 1 is that the binder polyvinylidene fluoride in this comparative example is 2.2 parts, and other conditions are consistent with comparative example 1.

[0110] The SEM of the positive electrode sheet after rolling provided in this comparative example is as follows Figure 4 shown.

[0111] Comparative Example 3

[0112] This comparative example provides a positive electrode slurry and a preparation method thereof, a positive electrode plate and a battery. The difference from Example 1 is that the single-walled carbon nanotubes in the negative electrode slurry of the positive electrode slurry and the negative electrode plate in the battery of this comparative example are 45 parts, and other conditions are consistent with Example 1.

[0113] Comparative Example 4

[0114] This comparative example provides a positive electrode slurry and a preparation method thereof, a positive electrode plate and a battery. The difference from Example 1 is that the binder polyvinylidene fluoride in this comparative example is 4 parts, and other conditions are consistent with Example 1.

[0115] The above embodiments and comparative examples were subjected to a pole piece peel strength test. The specific test results are shown in Figure 5 shown.

[0116] The electrode peel strength test method is as follows: the electrode is cut into 12*2mm samples, the pressure-sensitive 3M-VHB double-sided tape is attached to the electrode surface, and the other side is attached to the stainless steel plate. The stainless steel plate and the current collector are fixed on the two clamps of the stretching equipment, and then the sample is stretched at a speed of 250mm / min. A 180-degree peel test is performed. The force detected when the aluminum current collector is completely peeled off is the peeling force. The greater the peeling force, the higher the peeling strength of the electrode.

[0117] The pole piece tensile strength test was performed on the above-mentioned embodiments and comparative examples, and the specific test results are shown in Table 1.

[0118] The pole piece tensile strength test method is as follows: ① Cut the pole piece to be tested into samples with a width of 15mm, and screen out the samples with no burrs on the edge of the pole piece; ② Install the pole piece sample on the tensile testing machine to make sure that the sample is fixed intact; ③ The test gauge length is 50mm, the test loading speed is 5mm / min, and the force-displacement curve is obtained after the test, and the tensile strength of the pole piece is calculated.

[0119] Table 1 Pole tensile strength test

[0120]

[0121] The batteries prepared in the above embodiments and comparative examples were subjected to positive and negative electrode heavy object impact tests according to standard GB31241-2022, including pass rate, NG quantity and low zero voltage quantity tests.

[0122] Among them, the pass rate: the test cells that did not catch fire or explode are considered passed, and the proportion of cells that passed to the total number of cells tested;

[0123] NG quantity: the proportion of cells that caught fire or exploded to the total number of cells tested;

[0124] Low zero voltage quantity: the proportion of cells with voltage <4.1V among the cells that passed the test;

[0125] The actual disassembly pictures of the positive electrode sheets of Example 1-2 and Comparative Example 1-2 after the heavy object impact test are as follows Figure 6-9 As shown;

[0126] The specific results of the heavy object impact test are shown in Table 2.

[0127] Table 2 Heavy object impact test results

[0128] sample Pass Rate NG amount Low zero voltage quantity Example 1 18 / 20 2 / 20 4 / 18 Example 2 20 / 20 0 / 20 1 / 20 Example 3 16 / 20 4 / 20 3 / 16 Example 4 13 / 20 7 / 20 6 / 13 Comparative Example 1 11 / 20 9 / 20 5 / 11 Comparative Example 2 13 / 20 7 / 20 4 / 13 Comparative Example 3 9 / 20 11 / 20 4 / 9 Comparative Example 4 11 / 20 9 / 20 3 / 11

[0129] From the above tests, it can be seen that the introduction of single-walled carbon nanotubes is conducive to improving the heavy object impact passing rate of cylindrical batteries, among which the effect of adding single-walled carbon nanotubes to the positive electrode is better than that of the negative electrode. This is because the strength of the positive electrode sheet is much higher than that of the negative electrode sheet. When only the negative electrode is doped with single-walled carbon nanotubes, the mechanical properties of the negative electrode sheet are still relatively low. After the heavy object impact / extrusion test, the peeling or broken burrs of the positive electrode layer are very easy to pierce the diaphragm and cause internal short circuit. When the binder content increases, the peeling strength of the electrode sheet increases, and the passing rate of the heavy object impact test is slightly improved, indicating that improving the peeling strength is conducive to improving the heavy object impact performance, but because the tensile strength of the positive electrode sheet is not improved, the passing rate of the heavy object impact test is not significantly improved; when the binder content is too high, the viscosity of the slurry is too large, coating is difficult, and the discharge capacity of the battery cell is reduced, affecting the electrochemical performance of the battery cell.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0131] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A highly safe electrode slurry, characterized in that: The raw materials include, by weight: 95-105 parts of electrode active material, 0.5-1.5 parts of conductive agent, 15-35 parts of additive, 1-2.5 parts of binder, 10-30 parts of solvent; The additive includes a single-walled carbon nanotube solution.

2. The highly safe electrode slurry according to claim 1, characterized in that: The raw materials of the single-walled carbon nanotube solution include single-walled carbon nanotubes and a suspending agent.

3. The highly safe electrode slurry according to claim 2, characterized in that: At least one of the following conditions is met: A. The mass ratio of the single-walled carbon nanotubes to the suspending agent is 0.5-2:20-40; B. the suspending agent comprises one or more of N-methylpyrrolidone, polyethylene glycol octylphenyl ether, polyvinylpyrrolidone, and carboxymethylcellulose; C. The average diameter of the single-walled carbon nanotubes is 0.7nm-2nm, the length is 10μm-35μm, and the specific surface area is 1000m 2 / g-1500m 2 / g.

4. The highly safe electrode slurry according to claim 1, characterized in that: The electrode active material includes a positive electrode active material and / or a negative electrode active material.

5. The highly safe electrode slurry according to claim 4, characterized in that: At least one of the following conditions is met: A. The electrode active material includes a positive electrode active material; B. The positive electrode active material includes lithium nickel cobalt manganese oxide and / or lithium nickel cobalt aluminum oxide; C. The negative electrode active material includes one or more of graphite, silicon oxide, and silicon carbon.

6. The highly safe electrode slurry according to claim 1, characterized in that: The conductive agent includes carbon black.

7. The highly safe electrode slurry according to claim 1, characterized in that: At least one of the following conditions is met: A. The binder includes one or more of polyvinylidene fluoride, sodium carboxymethyl cellulose, and styrene-butadiene rubber; B. the solvent includes an oily solvent; The oily solvent includes N-methylpyrrolidone.

8. A method for preparing a highly safe electrode slurry, characterized in that: include: The raw materials of the high-safety electrode slurry according to any one of claims 1 to 7 are mixed to prepare the high-safety electrode slurry.

9. An electrode plate, characterized in that: The invention relates to a high-safety electrode slurry comprising the high-safety electrode slurry according to any one of claims 1 to 7 or the high-safety electrode slurry prepared by the preparation method of the high-safety electrode slurry according to claim 8.

10. A battery, characterized in that: Including the electrode plate as described in claim 9.

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