Battery slurry wetting agent as well as preparation method and application thereof

Abstract

The invention relates to a battery slurry wetting agent and a preparation method and application thereof, the battery slurry wetting agent provided by the invention can effectively reduce the surface tension of water-based negative electrode slurry, so that the water-based negative electrode slurry can quickly achieve the purpose of wetting a carbon material in the pulping process; the problems that an existing water-based negative electrode slurry stirring process is too long in time, particles and scratches are prone to being generated during coating, and foil leakage, shrinkage cavities, cracks and the like are prone to being generated during drying and rolling are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of secondary batteries and relates to a battery slurry additive, in particular to a battery slurry wetting agent and a preparation method and application thereof. Background Art

[0002] In today's energy field, secondary batteries, especially lithium-ion batteries, have been widely used in many fields such as portable electronic devices, electric vehicles, and energy storage power stations due to their many advantages such as high energy density, long cycle life, and relatively low self-discharge rate. The electrode manufacturing process of lithium-ion batteries is one of the key links that determine battery performance, and the preparation quality of electrode slurry plays a vital role in it.

[0003] Electrode slurry is usually composed of active materials, conductive agents, binders and solvents. Among them, the wetting agent is a key auxiliary component. Although it accounts for a relatively small proportion, its influence on the overall performance of the slurry cannot be underestimated. During the slurry preparation process, active materials, conductive agents, etc. often have a strong tendency to agglomerate, which is due to their own surface properties and the interaction between particles. If the agglomeration problem cannot be effectively solved, the uniformity of the slurry will be extremely poor, and defects such as uneven coating thickness and abnormal porosity will appear during the electrode coating process, which will eventually seriously affect the battery's charge and discharge performance, capacity and cycle life.

[0004] The negative electrode is an important component of lithium-ion batteries. Usually, the negative electrode is made by coating the aqueous slurry on the copper foil, and then drying, rolling, shearing and other processes. In the actual production process, the following problems are often encountered: First, in the production process of the negative electrode slurry, due to the influence of the surface tension of the carbon material, when water is used as a solvent, it takes a long time of stirring to achieve the effect of complete infiltration, and the production efficiency is low; second, it is difficult to clean the stirring equipment when switching materials; third, when the negative electrode slurry is coated on the copper foil, problems such as granularity and scratches often occur; fourth, after the negative electrode slurry is coated on the copper foil and dried, the solid matter on the copper foil needs to be compacted by rolling, and the solid matter often sticks to the roller, causing problems such as the pole piece being exposed or shrinkage holes appearing, losing the coating effect, and increasing the defective rate of the product; fifth, after the negative electrode slurry is coated on the copper foil and dried, it is easy to cause cracks.

[0005] Therefore, developing a battery slurry wetting agent that can overcome the above-mentioned defects is of vital importance to improving the comprehensive performance of lithium-ion batteries and promoting their widespread application in more fields. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a battery slurry wetting agent and a preparation method and application thereof, wherein the battery slurry wetting agent can effectively reduce the surface tension of the aqueous negative electrode slurry, so that the aqueous negative electrode slurry can achieve the purpose of wetting the carbon material more quickly during the slurrying process, thereby solving the problems of the existing aqueous negative electrode slurry stirring process being too long, particles and scratches being easily generated during coating, and foil leakage, shrinkage holes and cracks being easily generated during drying and rolling.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a battery slurry wetting agent, the chemical formula of the battery slurry wetting agent is:

[0009]

[0010] Among them, A is 1-3, B is 0-20, and n is 1-30.

[0011] The surface tension of battery slurry originates from the interaction between liquid molecules. After the battery slurry wetting agent migrates to the gas-liquid interface in the liquid and arranges itself in a directional manner (the polysiloxane segment has a low surface energy and faces the air end, and the polyether segment faces the liquid end), the polysiloxane segment plays an isolating role, weakening the interaction between molecules on the liquid surface, thereby reducing the surface tension. Compared with the prior art, the battery slurry wetting agent provided by the present invention has a more regular molecular arrangement and can quickly migrate to the gas-liquid interface in the liquid, thereby better reducing the surface tension.

[0012] The battery slurry wetting agent provided by the present invention can effectively reduce the surface tension of the aqueous negative electrode slurry, so that the aqueous negative electrode slurry can achieve the purpose of wetting the carbon material more quickly during the slurrying process, thereby solving the problems of the existing aqueous negative electrode slurry stirring process being too long, particles and scratches being easily generated during coating, and foil leakage, shrinkage holes and cracks being easily generated during drying and rolling.

[0013] In the chemical formula of the battery slurry wetting agent provided by the present invention, if the value of A is high, it will lead to an increase in the number of connected polyether segments, excessive hydrophilicity, reduced surface activity, and affect the effect of reducing surface tension; if the value of B is too high, it will lead to increased viscosity, reduced compatibility of the system, and affect the effect of reducing surface tension; if the value of n is too large, it will also lead to excessive hydrophilicity, reduced surface activity, affect the effect of reducing surface tension, and increase viscosity. Therefore, in the chemical formula of the battery slurry wetting agent provided by the present invention, the value of A is 1-3, for example, it can be 1, 2 or 3, preferably 1-2; the value of B is 0-20, for example, it can be 0, 1, 3, 5, 8, 10, 12, 15, 18 or 20, etc., preferably 0-5; the value of n is 1-30, for example, it can be 4, 8, 10, 15, 20, 25 or 30, etc., preferably 4-10. For example, A is 1, B is 1, and n is 4; A is 1, B is 2, and n is 4; A is 1, B is 3, and n is 4; A is 1, B is 4, and n is 4; A is 1, B is 5, and n is 4; A is 2, B is 1, and n is 4; A is 2, B is 2, and n is 4; A is 2, B is 3, and n is 4; A is 2, B is 4, and n is 4; A is 2, B is 5, and n is 4; A is 2, B is 10, and n is 15; A is 1, B is 10, n is 15; A is 3, B is 10, n is 15; A is 2, B is 1, n is 15; A is 2, B is 5, n is 15; A is 2, B is 15, n is 15; A is 2, B is 20, n is 15; A is 2, B is 10, n is 4; A is 2, B is 10, n is 10; A is 2, B is 10, n is 20; A is 2, B is 10, n is 30; A is 2, B 10, n is 1.

[0014] In a second aspect, the present invention provides a method for preparing the battery slurry wetting agent according to the first aspect, the preparation method comprising the following steps:

[0015] Under protective atmosphere conditions, allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil are mixed, and after heating, a catalyst is added to react to obtain the battery slurry wetting agent;

[0016] The chemical formula of the allyl alcohol polyoxyethylene ether is:

[0017] Wherein, n is 1-30, for example, 1, 4, 8, 10, 15, 20, 25 or 30, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0018] The chemical formula of the hydrogen-containing silicone oil is:

[0019] Among them, A is 1-3 and B is 0-20.

[0020] In the chemical formula of the hydrogen-containing silicone oil provided by the present invention, the value of A is 1-3, for example, it can be 1, 2 or 3; the value of B is 0-20, for example, it can be 0, 1, 3, 5, 8, 10, 12, 15, 18 or 20, etc.

[0021] Preferably, the gas used for the protective atmosphere includes nitrogen and / or an inert gas.

[0022] Optionally, the inert gas includes any one of helium, neon or argon, or a combination of at least two of them. Typical but non-limiting combinations include a combination of helium and neon, a combination of neon and argon, a combination of helium and argon, or a combination of helium, neon and argon.

[0023] Preferably, the molar ratio of the allyl alcohol polyoxyethylene ether to the hydrogen-containing silicone oil is 1.1:1-1.5:1, for example, 1.1:1, 1.2:1, 1.3:1, 1.4:1 or 1.5:1, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] Preferably, the catalyst comprises platinum-1,3-diethene-1,1,3,3-tetramethyldisiloxane and / or chloroplatinic acid, preferably chloroplatinic acid.

[0025] Preferably, the amount of the catalyst is 5ppm-50ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil, for example, it can be 5ppm, 10ppm, 20ppm, 30ppm, 40ppm or 50ppm, but is not limited to the listed values, and the remaining unlisted values ​​within the numerical range are also applicable.

[0026] Preferably, the heating temperature is 70°C-120°C, for example, 70°C, 90°C, 100°C, 110°C or 120°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0027] In the preparation method provided by the present invention, the temperature at which the catalyst is added to react affects the reaction effect; when the reaction temperature is too low, the silicon-hydrogen bonds in the hydrogen-containing silicone oil and the double bonds in the allyl alcohol polyoxyethylene ether cannot be completely added, and unreacted raw materials will remain in the product, affecting the wetting performance of the battery slurry wetting agent; and when the temperature is too high, it will lead to the occurrence of side reactions, such as the silicon-hydrogen bonds in the hydrogen-containing silicone oil will undergo self-polymerization reaction to generate cross-linked products, which will increase the viscosity of the battery slurry wetting agent and reduce the wetting performance.

[0028] Preferably, the reaction temperature is 70°C-120°C, for example, 70°C, 90°C, 100°C, 110°C or 120°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0029] Preferably, the reaction time is more than 4 hours.

[0030] Under the preferred reaction temperature conditions of the present invention, the preparation of the battery slurry wetting agent can be completed by making the reaction time be more than 4 hours.

[0031] The reaction of the present invention can be carried out under conditions that are conducive to mass transfer.

[0032] Preferably, the reaction is carried out under stirring conditions.

[0033] The purpose of stirring during the reaction of the present invention is to make the reaction materials fully contact and to quickly transfer heat in the system, and to avoid the occurrence of side reactions caused by excessive concentration of local reactants to a certain extent. The present invention does not further limit the specific speed of the stirring condition, as long as the purpose of stirring can be achieved.

[0034] In a third aspect, the present invention provides a lithium-ion battery slurry, which includes an electrode active material, a conductive agent, a thickener, a binder, a solvent, and the battery slurry wetting agent described in the first aspect.

[0035] The electrode active material in the lithium ion battery slurry includes a positive electrode active material or a negative electrode active material. When the electrode active material is a positive electrode active material, the lithium ion battery slurry is a lithium ion battery positive electrode slurry; when the electrode active material is a negative electrode active material, the lithium ion battery slurry is a lithium ion battery negative electrode slurry.

[0036] Preferably, the lithium ion battery slurry is a lithium ion battery negative electrode slurry.

[0037] Preferably, the negative electrode active material includes any one of natural graphite, artificial graphite, graphitized carbon fiber, graphitized mesophase carbon microspheres or amorphous carbon, or a combination of at least two of them. Typical but non-limiting combinations include a combination of natural graphite and artificial graphite, a combination of graphitized carbon fiber and graphitized mesophase carbon microspheres, a combination of graphitized carbon fiber, graphitized mesophase carbon microspheres and amorphous carbon, or a combination of natural graphite, artificial graphite, graphitized carbon fiber, graphitized mesophase carbon microspheres and amorphous carbon.

[0038] Preferably, the conductive agent includes any one of conductive carbon black, carbon fiber, carbon nanotube or graphene or a combination of at least two thereof. Typical but non-limiting combinations include a combination of conductive carbon black and carbon fiber, a combination of carbon fiber and carbon nanotube, a combination of carbon nanotube and graphene, a combination of conductive carbon black, carbon fiber and carbon nanotube, a combination of carbon fiber, carbon nanotube and graphene, or a combination of conductive carbon black, carbon fiber, carbon nanotube and graphene.

[0039] Preferably, the thickener comprises any one of sodium carboxymethyl cellulose, hydroxyethyl cellulose, carboxypropyl cellulose, chitosan, polyvinyl alcohol or polyacrylic acid, or a combination of at least two thereof. Typical but non-limiting combinations include a combination of sodium carboxymethyl cellulose and hydroxyethyl cellulose, a combination of carboxypropyl cellulose and chitosan, a combination of polyvinyl alcohol and polyacrylic acid, a combination of sodium carboxymethyl cellulose, hydroxyethyl cellulose and carboxypropyl cellulose, or a combination of sodium carboxymethyl cellulose, hydroxyethyl cellulose, carboxypropyl cellulose, chitosan, polyvinyl alcohol and polyacrylic acid.

[0040] Preferably, the binder comprises any one of styrene-butadiene rubber, nitrile rubber or butadiene rubber or a combination of at least two thereof, typical but non-limiting combinations comprising a combination of styrene-butadiene rubber and nitrile rubber, a combination of nitrile rubber and butadiene rubber, or a combination of styrene-butadiene rubber, nitrile rubber and butadiene rubber.

[0041] Preferably, the solvent comprises water.

[0042] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The surface tension of the battery slurry originates from the interaction between liquid molecules. After the battery slurry wetting agent migrates to the gas-liquid interface in the liquid and arranges in a directional manner (the polysiloxane segment has a low surface energy, facing the air end, and the polyether segment faces the liquid end), the polysiloxane segment plays an isolating role, weakening the interaction between the molecules on the liquid surface, thereby reducing the surface tension. Compared with the prior art, the molecular arrangement of the battery slurry wetting agent provided by the present invention is more regular, and it can quickly migrate to the gas-liquid interface in the liquid, so that the surface tension can be better reduced; therefore, the battery slurry wetting agent provided by the present invention can effectively reduce the surface tension of the aqueous negative electrode slurry, so that the aqueous negative electrode slurry can achieve the purpose of wetting the carbon material faster during the slurrying process, solving the problems of the existing aqueous negative electrode slurry stirring process being too long, easy to generate particles and scratches during coating, easy to generate foil leakage, shrinkage and cracks during drying and rolling. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0046] Example 1

[0047] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is:

[0048] Among them, A is 2, B is 10, and n is 15.

[0049] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0050] In a nitrogen atmosphere, 0.11 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 70°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred at 70°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 50 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0051] The chemical formula of the allyl alcohol polyoxyethylene ether is:

[0052] Among them, n is 15.

[0053] The chemical formula of the hydrogen-containing silicone oil is:

[0054] Where A is 2 and B is 10.

[0055] Example 2

[0056] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is the same as that of Example 1.

[0057] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0058] In a nitrogen atmosphere, 0.12 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 80°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred at 80°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 40 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0059] The chemical formula of the allyl alcohol polyoxyethylene ether is the same as that of Example 1.

[0060] The chemical formula of the hydrogen-containing silicone oil is the same as that of Example 1.

[0061] Example 3

[0062] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is the same as that of Example 1.

[0063] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0064] In a nitrogen atmosphere, 0.13 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 90°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred at 90°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 30 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0065] The chemical formula of the allyl alcohol polyoxyethylene ether is the same as that of Example 1.

[0066] The chemical formula of the hydrogen-containing silicone oil is the same as that of Example 1.

[0067] Example 4

[0068] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is the same as that of Example 1.

[0069] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0070] In a nitrogen atmosphere, 0.14 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 100°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred at 100°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 20 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0071] The chemical formula of the allyl alcohol polyoxyethylene ether is the same as that of Example 1.

[0072] The chemical formula of the hydrogen-containing silicone oil is the same as that of Example 1.

[0073] Example 5

[0074] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is the same as that of Example 1.

[0075] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0076] In a nitrogen atmosphere, 0.15 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 110°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred and reacted at 110°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 10 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0077] The chemical formula of the allyl alcohol polyoxyethylene ether is the same as that of Example 1.

[0078] The chemical formula of the hydrogen-containing silicone oil is the same as that of Example 1.

[0079] Example 6

[0080] This embodiment provides a battery slurry wetting agent, and the chemical formula of the battery slurry wetting agent is the same as that of Example 1.

[0081] The preparation method of the battery slurry wetting agent provided in this embodiment comprises the following steps:

[0082] In a nitrogen atmosphere, 0.15 mol of allyl alcohol polyoxyethylene ether and 0.1 mol of hydrogen-containing silicone oil were mixed, the temperature was raised to 120°C, chloroplatinic acid catalyst was added to the system, and then the mixture was stirred at 120°C for 4 hours. After the reaction, a yellow transparent liquid was obtained, which was the battery slurry wetting agent described in this embodiment. The amount of chloroplatinic acid catalyst used was 5 ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

[0083] The chemical formula of the allyl alcohol polyoxyethylene ether is the same as that of Example 1.

[0084] The chemical formula of the hydrogen-containing silicone oil is the same as that of Example 1.

[0085] Example 7

[0086] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that A in the chemical formula of the final obtained battery slurry wetting agent is 1.

[0087] Example 8

[0088] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that A in the chemical formula of the final obtained battery slurry wetting agent is 3.

[0089] Example 9

[0090] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that B in the chemical formula of the final obtained battery slurry wetting agent is 1.

[0091] Example 10

[0092] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that B in the chemical formula of the final battery slurry wetting agent is 5.

[0093] Embodiment 11

[0094] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that B in the chemical formula of the final obtained battery slurry wetting agent is 15.

[0095] Example 12

[0096] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that B in the chemical formula of the final obtained battery slurry wetting agent is 20.

[0097] Embodiment 13

[0098] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final obtained battery slurry wetting agent is 4.

[0099] Embodiment 14

[0100] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final obtained battery slurry wetting agent is 10.

[0101] Embodiment 15

[0102] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final obtained battery slurry wetting agent is 20.

[0103] Example 16

[0104] This embodiment provides a battery slurry wetting agent, which is the same as Embodiment 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final obtained battery slurry wetting agent is 30.

[0105] Embodiment 17

[0106] This comparative example provides a battery slurry wetting agent, which is the same as Example 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final battery slurry wetting agent is 1.

[0107] Comparative Example 1

[0108] This comparative example provides a battery slurry wetting agent, which is the same as Example 1 except that the chemical formula of the hydrogen-containing silicone oil is changed so that A in the chemical formula of the final battery slurry wetting agent is 4.

[0109] Comparative Example 2

[0110] This comparative example provides a battery slurry wetting agent, which is the same as Example 1 except that the chemical formula of allyl alcohol polyoxyethylene ether is changed so that n in the chemical formula of the final battery slurry wetting agent is 35.

[0111] Performance Characterization

[0112] The negative electrode active material, the conductive agent, the binder, the thickener and the battery slurry wetting agent provided in the above embodiment and the comparative example are prepared into a negative electrode slurry in the proportion of 97.8%, 0.5%, 0.5%, 1% and 0.2% by mass; and the negative electrode active material, the conductive agent, the binder and the thickener are prepared into the negative electrode slurry of the comparative example in the mass ratio of 97.8:0.5:0.5:1. The negative electrode active material is artificial graphite, the conductive agent is conductive carbon black (Super P), the thickener is sodium carboxymethyl cellulose, and the binder is water-emulsified styrene-butadiene rubber (SBR). The method for preparing the negative electrode slurry includes: controlling the solid content to be 55wt%, mixing and stirring deionized water, the negative electrode active material, the conductive agent, the binder, the thickener and the battery slurry wetting agent at a speed of 2500r / min, and recording the time required for the negative electrode slurry to reach the same fineness (recorded as the uniform dispersion time), the viscosity and the surface tension. The results are shown in Table 1.

[0113] Table 1

[0114]

[0115] In summary, the battery slurry wetting agent provided by the present invention can effectively reduce the surface tension of the aqueous negative electrode slurry, so that the aqueous negative electrode slurry can achieve the purpose of wetting the carbon material more quickly during the slurrying process, solving the problems of the existing aqueous negative electrode slurry stirring process being too long, particles and scratches being easily generated during coating, and foil leakage, shrinkage holes and cracks being easily generated during drying and rolling.

[0116] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A battery slurry wetting agent, characterized in that: The chemical formula of the battery slurry wetting agent is: Among them, A is 1-3, B is 0-20, and n is 1-30.

2. A method for preparing the battery slurry wetting agent according to claim 1, characterized in that: The preparation method comprises the following steps: Under protective atmosphere conditions, allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil are mixed, and after heating, a catalyst is added to react to obtain the battery slurry wetting agent; The chemical formula of the allyl alcohol polyoxyethylene ether is: Wherein, n is 1-30; The chemical formula of the hydrogen-containing silicone oil is: Among them, A is 1-3 and B is 0-20.

3. The preparation method according to claim 2, characterized in that: The molar ratio of the allyl alcohol polyoxyethylene ether to the hydrogen-containing silicone oil is 1.1:1-1.5:

1.

4. The preparation method according to claim 2 or 3, characterized in that: The catalyst includes platinum-1,3-diethene-1,1,3,3-tetramethyldisiloxane and / or chloroplatinic acid.

5. The preparation method according to any one of claims 2 to 4, characterized in that: The amount of the catalyst used is 5ppm-50ppm of the total mass of allyl alcohol polyoxyethylene ether and hydrogen-containing silicone oil.

6. The preparation method according to any one of claims 2 to 5, characterized in that: The heating temperature is 70°C-120°C.

7. The preparation method according to any one of claims 2 to 6, characterized in that: The reaction temperature is 70°C-120°C; Preferably, the reaction time is more than 4 hours.

8. The preparation method according to any one of claims 2 to 7, characterized in that: The reaction is carried out under stirring conditions.

9. A lithium ion battery slurry, characterized in that: The lithium-ion battery slurry comprises an electrode active material, a conductive agent, a thickener, a binder, a solvent and the battery slurry wetting agent according to claim 1.

10. The lithium-ion battery slurry according to claim 9, characterized in that: The lithium ion battery slurry is a lithium ion battery negative electrode slurry.

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