Edge insulation protective light-cured jet printing ink and preparation method and application thereof

Abstract

The application belongs to the technical field of battery pole piece, and specifically discloses an edge insulation protective light-curing jet printing ink, a preparation method and application thereof. The raw materials of the ink include 20-60 parts of light-curing prepolymer, 30-70 parts of active diluent, 1-8 parts of photoinitiator and 0.4-3 parts of additive. The light-curing prepolymer includes a functionalized polymer containing polyolefin oligomer and / or polyolefin acrylate, and at least one of polyurethane acrylate resin, pure acrylate resin, epoxy acrylate resin and polyester acrylate resin. The active diluent includes mono- / poly-functional acrylate. The additive is at least one of leveling agent and thiol compound. The ink has the advantages of fast curing speed, excellent flexibility, self-supporting, wear resistance and corrosion resistance, and can be suitable for inkjet printing coating process, and has the advantages of high efficiency, almost 100% utilization rate, precise coating of the edge of the pole piece, good mechanical properties of the film layer and the like.

Description

Technical Field

[0001] This invention relates to the field of battery electrode technology, and in particular to an edge-insulating and protective photocurable inkjet ink, its preparation method, and its application. Background Technology

[0002] Solid-state batteries, as lithium-ion batteries using solid electrolytes, offer significant advantages over traditional liquid electrolyte batteries, including non-flammability, non-corrosiveness, non-volatility, and high-temperature resistance. Their safety and energy density are significantly improved, making them a crucial development direction for next-generation advanced energy storage power sources. The solid electrolyte, as the core material of the battery, directly determines key parameters such as cycle stability, energy density, safety performance, and high / low temperature performance. In electrode fabrication, solid-state batteries often employ a wet coating process. This involves mixing the solid electrolyte and active materials to form a high-viscosity slurry, which is then coated onto an extremely thin aluminum foil current collector to form a wet coating approximately 100-300 μm thick. This is followed by pressing and sintering to create the electrode sheet. However, during subsequent winding or stacking assembly, the electrode edge areas are prone to cracking and insulation failure due to the high stress they experience. Therefore, reliable insulation treatment of the electrode edges is essential.

[0003] Existing technologies have addressed insulation protection for electrode edges. For example, patent CN117603635A discloses an adhesive and electrode tapes and lithium-ion batteries using it. This invention provides an adhesive comprising 5-15 wt% ethylene components, 30-50 wt% acrylate components, and 40-60 wt% maleic anhydride copolymer components. It is used as an adhesive on the surface of polyester and polyethylene films to form an insulating tape, used to prevent short circuits between the positive and negative electrode tabs during battery encapsulation. Although this adhesive maintains good adhesion performance at both high and low temperatures, the tape preparation process involves preheating and mixing the adhesive layer raw materials at 80-150°C, then melting and blending them at 220-290°C and coating them onto a substrate, followed by cooling and shaping to obtain the electrode tape. This process is prone to problems such as unstable adhesive flow, uneven adhesive layer thickness, and bubble formation, making it difficult to accurately control the amount of adhesive applied to the electrode edges. Furthermore, patent CN118763169A addresses the issue of insufficient adhesion between electrodes in solid-state battery cells by proposing a method and apparatus for electrode frame lamination. However, it still fails to solve the stringent requirements of the winding process on coating flexibility—the coating must be able to withstand folding without cracking, while the edges of the positive electrode must possess sufficient mechanical strength to support the battery structure. In actual production, the pressure exerted on stacked electrodes can easily cause adhesion between coatings. Traditional coating methods struggle to achieve precise control of the coating area and cannot effectively protect the electrode edges from failure risks under pressure conditions.

[0004] Therefore, there is still a lack of a dedicated insulating material and coating method in the existing technology that can be applied to solid-state battery electrodes, achieve high-speed and high-precision coating, and effectively protect the edges from cracking and insulation failure during stacking and pressure. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an edge-insulating protective photocurable inkjet ink, its preparation method, and its application. The core advantage of the present invention lies in the fact that, through a printable viscosity design that precisely matches the requirements of the inkjet printing process, high-precision control of thickness and range is achieved during the printing process; at the same time, relying on the synergistic effect of various photocurable prepolymers and active diluents, a perfect unity of insulation protection performance and process adaptability is achieved, effectively solving the problems of cracking and insulation failure at the edges of solid-state battery electrodes during the winding, stacking, and pressure bearing processes.

[0006] This invention specifically designs the printable viscosity parameters of the ink system to precisely adapt to the hydrodynamic requirements of inkjet printing coating processes. This enables stable continuous printing without clogging or sagging, laying the foundation for precise control of thickness and coverage. Based on this adaptable viscosity design, the ink of this invention can achieve precise positioning of the coating area at the edge of the electrode through the inkjet printing process—forming a coating layer only in the edge areas requiring insulation protection. This completely solves the problems of traditional coating methods, such as difficulty in controlling the coating range, material waste, or missed protection. Simultaneously, it allows for high-precision control of the coating thickness, flexibly adjusting the coating thickness according to different electrode specifications, avoiding problems such as insulation failure or insufficient mechanical properties due to uneven thickness. Compared to the shortcomings of traditional coating processes, such as unstable flow rate and large thickness deviations, this invention significantly improves production consistency and product reliability.

[0007] In terms of composition design, the edge-insulating protective photocurable inkjet printing ink of the present invention, by weight, comprises the following raw materials: 20-60 parts of photocurable prepolymer, 30-70 parts of reactive diluent, 1-8 parts of photoinitiator, and 0.4-3 parts of additives. The photocurable prepolymer is based on a functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates, and is compounded with at least one of polyurethane acrylate resin, pure acrylate resin, epoxy acrylate resin, and polyester acrylate resin; the reactive diluent is a combination of monofunctional acrylates and polyfunctional acrylates (including difunctional and trifunctional acrylates); and the additives are at least one of leveling agents and thiol compounds.

[0008] Each photocurable prepolymer component works synergistically: functionalized polymers containing polyolefin oligomers and / or polyolefin acrylates impart excellent flexibility and substrate compatibility to the coating, ensuring that the coating does not crack during folding; polyurethane acrylates enhance the elasticity and adhesion of the coating, improving the bonding strength between the coating and the electrode current collector; pure acrylate resins optimize the film-forming properties and weather resistance of the coating; epoxy acrylates improve the hardness and mechanical strength of the coating, helping the coating form a strong and tough skeleton to resist stacking pressure; and polyester acrylates improve the wear resistance and corrosion resistance of the coating.

[0009] It should be noted that the core function of the reactive diluent in this invention is to "adjust ink viscosity and participate in cross-linking film formation," and its effect is determined by the number of functional groups (the number of polymerizable double bonds / thiol groups) and the molecular structure. This invention achieves precise synergy in the film formation stage through a combination of "monofunctional and polyfunctional" acrylate monomers, ensuring a balance between coating performance and process compatibility.

[0010] Specifically, in monofunctional acrylates, the bicyclic structure of isobornyl methacrylate (IBOA) or isobornyl acrylate, when combined with polyfunctional acrylates, can enhance the coating's hardness and self-support, thus providing effective support for the electrode edges. Meanwhile, the long alkyl chains of lauryl acrylate (LA) can rotate freely within the crosslinking network, acting as "elastic segments" filling the gaps in the rigid framework formed by the resin and IBOA, alleviating the brittleness of the crosslinking network, improving the coating's elongation at break, and adapting to the requirements of electrode winding and bending. Simultaneously, the long alkyl chains of lauryl acrylate (LA) are hydrophobic, allowing them to match the nonpolar segments of functionalized polymers, while the weak polarity of its ester groups is compatible with the polar groups of polyurethane acrylate resins, effectively preventing resin-monomer delamination during film formation.

[0011] Among multifunctional acrylates, difunctional acrylates contain two acrylate double bonds, which can simultaneously connect resin segments and monomer segments of monofunctional acrylates to form a linear cross-linked structure. This avoids the defect of easy coating dissolution due to insufficient cross-linking of monofunctional diluents, and also prevents coating embrittlement caused by excessive cross-linking of trifunctional acrylates. Different difunctional acrylates exhibit varying double bond reactivity, which can synergistically regulate the chain growth rate with composite photoinitiators, ensuring the coating withstands UV irradiation (100mW / cm²). 2 Under these conditions, surface curing is completed within 2-3 seconds, preventing adhesion during electrode stacking. Furthermore, adding appropriate amounts of trifunctional acrylates (such as trimethylolpropane triacrylate) can increase the coating crosslinking density, enhancing its mechanical and insulating properties. The high-density crosslinking network can block lithium ion / electron migration channels, further improving the coating's volume resistivity and achieving a precise balance between hardness and toughness.

[0012] Through the synergistic design of the above-mentioned components and optimization of the process, the ink of this invention achieves the core performance of "combining rigidity and flexibility": on the one hand, it has sufficient flexibility to withstand winding and bending; on the other hand, it forms a strong and tough skeleton to resist stacking pressure and prevent cracking, while ensuring a firm adhesion to the current collector of the electrode. In addition, the ink of this invention also has the characteristic of fast photocuring speed, which can significantly improve production efficiency; the application of inkjet printing process enables it to have almost 100% material utilization, effectively reducing production costs; the excellent properties of the coating, such as self-support, wear resistance, and corrosion resistance, can also provide reliable support and insulation protection for the subsequent assembly of the electrode, comprehensively ensuring the structural stability and safety performance of the solid-state battery.

[0013] For example, the pure acrylate resin is at least one of Changxing 65328, Changxing DR-A830, and Changxing DR-A870.

[0014] For example, the polyurethane acrylate resin is at least one of Changxing 6113 and Changxing DR-U250.

[0015] Preferably, in the functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates, the polyolefin oligomers are polymers formed by polymerization of olefin monomers; the olefins include at least one of ethylene, propylene, and butene.

[0016] It should be noted that the aforementioned polyolefin oligomers refer to polymers with relatively short molecular chains and low molecular weights, which are polymerized from olefin monomers (such as ethylene, propylene, butene, etc.). Their viscosity is low, ranging from 500 to 5000 mPa·s at 25°C.

[0017] Preferably, in the functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates, the polyolefin acrylate is an oligomer with an olefin backbone in its molecular backbone and acrylate functional groups for UV curing branched at its ends or sides; wherein the olefin backbone includes at least one of polybutadiene, polyisoprene, and ethylene propylene rubber.

[0018] It should be noted that the polyolefin acrylate refers to oligomers whose molecular backbone is an olefin (polybutadiene, polyisoprene, ethylene propylene rubber, etc.) skeleton, with UV-curable acrylate functional groups branched at the ends or sides. They combine the excellent properties of olefin chains (low viscosity, high flexibility, water resistance, electrical insulation) with the rapid curing properties of acrylate.

[0019] Preferably, the monofunctional acrylate comprises at least one of isobornyl acrylate, isobornyl methacrylate (IBOA), lauryl acrylate (LA), isooctyl acrylate (2-EHA), isodecanyl acrylate (IDA), 2-phenoxyethyl acrylate (PHEA), ethoxylated nonylphenol acrylate, trimethylcyclohexyl acrylate, tetrahydrofurfuryl acrylate (THFA), cyclotrimethylolpropane formal acrylate (CTFA), acrylmorpholine (ACMO), and vinylmethyl oxazolidinone; the multifunctional acrylate... The esters include at least one of 1,6-hexanediol diacrylate (HDDA), 1,12-dodecyl glycol diacrylate, 1,10-decanediol diacrylate, neopentyl glycol diacrylate (NPGDA), polyethylene glycol diacrylate, tripropylene glycol diacrylate (TPGDA), tetraethylene glycol diacrylate (TTGDA), trimethylolpropane triacrylate (TMPTA), ethoxylated trimethylolpropane triacrylate (3EOTMPTA), and propoxylated trimethylolpropane triacrylate (3POTMPTA).

[0020] Preferably, the photoinitiator includes at least two of α-hydroxy ketone photoinitiators, acylphosphine oxide photoinitiators, thioxanthone photoinitiators, and α-amino ketone photoinitiators; the α-hydroxy ketone photoinitiator includes hydroxycyclohexanebenzophenone (184); the acylphosphine oxide photoinitiator includes at least one of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819) and (2,4,6-trimethylbenzoyl)-diphenylphosphine oxide (TPO); the thioxanthone photoinitiator includes at least one of 2-isopropylthioxanthone (ITX) and 2,4-diethylthioxanthone (DETX); and the α-amino ketone photoinitiator includes 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907).

[0021] Preferably, the raw materials of the ink further include a co-initiator; the co-initiator is an aminobenzoic acid ester compound; the aminobenzoic acid ester compound is ethyl 4-dimethylaminobenzoate (EDAB).

[0022] Preferably, the leveling agent is at least one of acrylic leveling agents and silicone leveling agents; the thiol compound includes at least one of mercaptoethanol, trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP), and pentaerythritol tetrakis(3-mercaptopropionic acid) ester (PETMP).

[0023] For example, the silicone leveling agent is at least one of BYK-333 and BYK-306.

[0024] For example, an acrylic leveling agent is BYK-358N.

[0025] Based on the same inventive concept, the present invention also provides a method for preparing any of the above-described edge-insulating protective photocurable inkjet printing inks, comprising the following steps:

[0026] S1. Under a light-protected / yellow light environment, add the photocurable prepolymer, reactive diluent, photoinitiator and additives to a dispersion tank and stir at room temperature to obtain a homogeneous and transparent mixture;

[0027] S2. The mixture is filtered sequentially through a filter device with pore sizes of 1 μm, 0.45 μm and 0.22 μm to obtain the edge-insulating protective photocurable inkjet ink.

[0028] Preferably, in step S1, the stirring speed is 300-500 rpm and the stirring time is 60-90 min.

[0029] Based on the same inventive concept, the present invention also provides the application of any of the above-described edge insulation protective photocurable inks in the edge insulation protection of solid lithium battery electrodes. The ink is coated onto the edge of the electrode by an inkjet printing device and forms an insulating protective layer after being irradiated by a UV-LED light source; wherein the coating width is 2-15mm.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) Excellent process adaptability, achieving high-precision and high-efficiency coating. The present invention is specifically designed with printable viscosity parameters for ink, which precisely match the fluid dynamics requirements of the inkjet printing process, enabling stable and continuous printing without clogging or dripping. Based on this viscosity design, precise positioning of the coating area at the edge of the electrode sheet and high-precision control of the coating thickness can be achieved, completely solving the problems of difficult range control, material waste, protection omissions and uneven thickness in traditional coating methods, significantly improving production consistency and product reliability. At the same time, the inkjet printing process has almost 100% material utilization, effectively reducing production costs.

[0032] (2) Synergistic effect of photocurable prepolymer resin to ensure the core performance of coating. The present invention is based on functionalized polymers containing polyolefin oligomers and / or polyolefin acrylates and compounded with a variety of acrylate resins. The components work synergistically to give the coating excellent comprehensive performance: functionalized polymers containing polyolefin oligomers and / or polyolefin acrylates ensure flexibility and compatibility with the substrate, avoiding cracking when rolled or bent; polyurethane acrylate enhances elasticity and adhesion; pure acrylate resin optimizes film-forming properties and weather resistance; epoxy acrylate improves hardness and mechanical strength to resist stacking pressure; polyester acrylate improves wear resistance and corrosion resistance, achieving the core performance requirement of "combining rigidity and flexibility". The high 1,2-vinyl double bond content in the polyolefin oligomer and / or polyolefin acrylate structure of the functionalized polymer containing polyolefin oligomer and / or polyolefin acrylate reacts with acrylate resin (including at least one of polyurethane acrylate resin, pure acrylate resin, epoxy acrylate resin, and polyester acrylate resin) or reactive diluent, thereby linking the nonpolar superhydrophobic segments of the functionalized polymer containing polyolefin oligomer and / or polyolefin acrylate to other resins (including at least one of polyurethane acrylate resin, pure acrylate resin, epoxy acrylate resin, and polyester acrylate resin) or reactive diluent (acrylate monomer); combining monofunctional and polyfunctional acrylates (including difunctional and trifunctional acrylates) with different activities, the main structure of the film-forming material can be tunable.

[0033] (3) Precise control of gradient functionality monomer system to optimize film quality and stability. This invention constructs a synergistic system by combining "monofunctional + difunctional + trifunctional" acrylate monomers. Monofunctional acrylates (such as IBOA and LA) can improve coating hardness, self-support and flexibility, alleviate crosslinking brittleness and avoid resin-monomer delamination; difunctional acrylates construct a linear crosslinking basic network to avoid defects of insufficient or excessive crosslinking, and work with photoinitiators to ensure rapid curing; a small amount of trifunctional acrylates increases crosslinking density, strengthens mechanical and insulating properties, achieves "hardness-toughness" balance, and effectively reduces coating internal stress and shrinkage.

[0034] (4) High curing efficiency, avoiding oxygen inhibition and stacking adhesion problems. This invention effectively solves the oxygen inhibition problem of traditional free radical photocuring systems by using a composite photoinitiator combined with thiol additives, regenerating active free radicals to ensure continuous polymerization and ensuring the coating withstands UV irradiation (100mW / cm²). 2 Under certain conditions, surface curing is completed within 2-3 seconds, avoiding electrode stacking and adhesion caused by incomplete surface drying, greatly improving production efficiency and adapting to the high-efficiency production needs of automated production lines.

[0035] (5) Excellent coating compatibility and protection ensure stable battery performance. The good compatibility between the active diluent and the prepolymer can avoid film delamination; at the same time, the cross-linking and entanglement of the photocurable prepolymer and the active diluent can effectively prevent the active diluent from penetrating and eroding the electrode substrate, avoiding its swelling, dissolution or reaction damage to the positive electrode, thus ensuring battery performance; after the coating is cured, it has excellent self-support, wear resistance and corrosion resistance, which can provide reliable support and insulation protection for electrode assembly, and comprehensively ensure the structural stability and safety performance of solid-state batteries.

[0036] (6) Significant application value, improving the overall quality and service life of the battery. The ink of this invention has a fast curing speed and strong adhesion, which can ensure the stability of the electrode in the battery structure and improve the electrode stacking efficiency; the excellent flexibility of the coating can adapt to the bending requirements of the electrode, avoiding performance degradation or structural damage caused by bending during use; the good support effect enhances the structural stability of the electrode during operation, reduces the risk of displacement or deformation, and thus improves the overall performance and service life of the solid-state battery. Attached Figure Description

[0037] Figure 1 This is a photograph of an edge-insulating and protective photocurable inkjet printing ink applied to the entire electrode sheet according to Embodiment 1 of the present invention, showing that the sheet does not crack when folded in half.

[0038] Figure 2 The infrared spectra of the edge-insulating protective photocurable inkjet inks of Embodiment 1 and Comparative Examples 1-2 of the present invention are shown. Detailed Implementation

[0039] To make the present invention easier to understand, specific embodiments are described below to further illustrate the invention. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical terms used below have the same meaning as understood by those skilled in the art; unless otherwise specified, the raw materials and reagents involved herein can be purchased commercially or obtained by known methods.

[0040] It should be noted that the electrode adhesive used in the performance testing section of this invention is a commercially available, transparent insulating material with low viscosity, 100% solid content, and rapid photocurability. The performance testing methods involved in the following examples and comparative examples are as follows:

[0041] (1) Viscosity test: The viscosity of the ink was measured using a rotational viscometer at 25°C and 100 rpm; (2) Curing speed test: The curing speed was measured using a UV-LED light source (power 100 mW / cm²). 2(3) Flexibility test: The cured coating sample (coated on aluminum foil current collector) is folded 180° and observed for cracking. If no cracking occurs after 3 consecutive folds, it is considered qualified. (4) Adhesion test: The 100-grid test method is used. After scribing, 3M tape is applied and then peeled off. The coating peeling is observed. Grade 0 (no peeling) is the best and Grade 5 is the worst. (5) Volume resistivity test: The volume resistivity of the cured coating is measured using a high resistance meter. (6) Stacking and adhesion test: The coated and cured electrode sheets are stacked (applied pressure of 0.5MPa and placed at room temperature for 24h). The adhesion between the electrode sheets is observed. (7) Elongation at break test: Tested according to GB / T1040.3-2006 standard. (8) Printing accuracy test: The edge of the electrode sheet is coated by inkjet printing equipment, and the coating width deviation is measured (set width 5mm). The deviation ≤ ±0.2mm is considered qualified.

[0042] In view of the technical problems mentioned in the background art, the present invention provides an edge-insulating protective photocurable inkjet ink, its preparation method, and its application. The edge-insulating protective photocurable inkjet ink of the present invention has a fast curing speed, excellent flexibility, and possesses self-supporting, wear-resistant, and corrosion-resistant properties. It can adapt to inkjet printing coating processes, and specifically offers advantages such as high efficiency, almost 100% utilization rate, precise coating of electrode edges, and good mechanical properties of the film layer; it can also provide a certain supporting role during subsequent electrode assembly.

[0043] The following examples and comparative models further illustrate this point.

[0044] Example 1

[0045] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0046] 15 parts of pure acrylic resin (Changxing 65328);

[0047] Five parts of polyurethane acrylate resin (Changxing 6113);

[0048] Five parts of polybutadiene acrylate (Sartomer CN307 NS);

[0049] 20 parts of isoborneol acrylate;

[0050] 6 parts lauryl acrylate;

[0051] 13 parts of trimethylcyclohexyl acrylate;

[0052] 15 parts of 1,10-decanediol diacrylate;

[0053] 11.6 parts of polyethylene glycol diacrylate;

[0054] 2 parts of trimethylolpropane triacrylate (TMPTA);

[0055] 1 part of 2-isopropylthioxanthone (ITX);

[0056] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0057] 1.5 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0058] 0.5 parts of ethyl 4-dimethylaminobenzoate (EDAB);

[0059] Leveling agent (BYK-333) 0.4 parts;

[0060] 1 part of trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP).

[0061] Preparation method:

[0062] S1. Under light-proof / yellow light conditions, add the above materials to a dispersion tank and stir at 400 rpm for 75 minutes at room temperature to obtain a homogeneous and transparent mixture;

[0063] S2. The mixture is filtered sequentially through filters with pore sizes of 1µm, 0.45µm and 0.22µm to obtain edge-insulating and protective photocurable inkjet printing ink.

[0064] Application method: The ink is applied to the edge of the positive electrode of a solid lithium battery using an inkjet printer (with a coating width of 5mm), and then cured by UV-LED light source (100mW / cm²) to form an insulating protective layer.

[0065] Example 2

[0066] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0067] 20 parts of pure acrylic resin (Changxing DR-A830);

[0068] 10 parts of polybutadiene acrylate (Osaka Organic Chemicals BAC-45);

[0069] 20 parts of isoborneol acrylate;

[0070] 9 parts lauryl acrylate;

[0071] 10 parts of trimethylcyclohexyl acrylate;

[0072] 10 parts of 1,12-dodecyl glycol diacrylate;

[0073] 9 parts of polyethylene glycol diacrylate;

[0074] 1 part of trimethylolpropane triacrylate (TMPTA);

[0075] Acryloylmorpholine (ACMO) 3.6 parts;

[0076] 1 part of 2-isopropylthioxanthone (ITX);

[0077] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0078] 2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0079] Leveling agent (BYK-358N) 0.4 parts;

[0080] One part of pentaerythritol tetrakis(3-mercaptopropionic acid) (PETMP).

[0081] The preparation method and application are the same as in Example 1, except that the stirring speed in step S1 is 300 rpm and the stirring time is 90 min.

[0082] Example 3

[0083] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0084] 10 parts of pure acrylic resin (Changxing DR-A870);

[0085] 10 parts of polyurethane acrylate resin (Changxing DR-U250);

[0086] Five parts of polyolefin oligomer (Evonik POLYVEST® EP MV);

[0087] 21 parts of isoborneol acrylate;

[0088] 9 parts lauryl acrylate;

[0089] 10 parts of 2-phenoxyethyl acrylate (PHEA);

[0090] Vinylmethyloxazolidinone (VMOX) 1.4 parts;

[0091] 13 parts of tripropylene glycol diacrylate (TPGDA);

[0092] 10 parts of polyethylene glycol diacrylate;

[0093] 3.2 parts of ethoxylated trimethylolpropane triacrylate (3EOTMPTA);

[0094] 1 part of 2-isopropylthioxanthone (ITX);

[0095] (2,4,6-Trimethylbenzoyl)-diphenylphosphine oxide (TPO) 3 parts;

[0096] 2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0097] Leveling agent (BYK-306) 0.4 parts;

[0098] One part mercaptoethanol.

[0099] The preparation method and application are the same as in Example 1, except that the stirring speed in step S1 is 500 rpm and the stirring time is 60 min.

[0100] Example 4

[0101] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0102] 15 parts of pure acrylic resin (Changxing 65328);

[0103] Five parts of polyurethane acrylate resin (Changxing 6113);

[0104] Five parts of polyolefin oligomer (Cray Valley Krasol® LBH-2000);

[0105] 20 parts of isoborneol acrylate;

[0106] 6 parts lauryl acrylate;

[0107] 13 parts of trimethylcyclohexyl acrylate;

[0108] 15 parts of 1,10-decanediol diacrylate;

[0109] 12 parts of polyethylene glycol diacrylate;

[0110] 1.6 parts of propoxylated trimethylolpropane triacrylate (3POTMPTA);

[0111] 1 part of 2-isopropylthioxanthone (ITX)

[0112] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0113] 1.5 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0114] 0.5 parts of ethyl 4-dimethylaminobenzoate (EDAB);

[0115] Leveling agent (BYK-333) 0.4 parts;

[0116] 1 part of trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP).

[0117] The preparation method and application are the same as in Example 1.

[0118] Comparative Example 1

[0119] The difference between this comparative example and Example 1 is that no functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates is added. Other steps and parameters are the same as in Example 1. Specifically:

[0120] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0121] 20 parts of pure acrylic resin (Changxing 65328);

[0122] Five parts of polyurethane acrylate resin (Changxing 6113);

[0123] 20 parts of isoborneol acrylate;

[0124] 6 parts lauryl acrylate;

[0125] 13 parts of trimethylcyclohexyl acrylate;

[0126] 15 parts of 1,10-decanediol diacrylate;

[0127] 11.6 parts of polyethylene glycol diacrylate;

[0128] 2 parts of trimethylolpropane triacrylate (TMPTA);

[0129] 1 part of 2-isopropylthioxanthone (ITX)

[0130] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0131] 1.5 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0132] 0.5 parts of ethyl 4-dimethylaminobenzoate (EDAB);

[0133] Leveling agent (BYK-333) 0.4 parts;

[0134] 1 part of trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP).

[0135] Comparative Example 2

[0136] The difference between this comparative example and Example 1 is that the photocurable prepolymer resin contains only polyolefin acrylate and no other resins. Other steps and parameters are the same as in Example 1. Specifically:

[0137] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0138] 25 parts of polybutadiene acrylate (Sartomer CN307 NS);

[0139] 20 parts of isoborneol acrylate;

[0140] 6 parts lauryl acrylate;

[0141] 13 parts of trimethylcyclohexyl acrylate;

[0142] 15 parts of 1,10-decanediol diacrylate;

[0143] 11.6 parts of polyethylene glycol diacrylate;

[0144] 2 parts of trimethylolpropane triacrylate (TMPTA);

[0145] 1 part of 2-isopropylthioxanthone (ITX);

[0146] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0147] 1.5 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0148] 0.5 parts of ethyl 4-dimethylaminobenzoate (EDAB);

[0149] Leveling agent (BYK-333) 0.4 parts;

[0150] 1 part of trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP).

[0151] Comparative Example 3

[0152] The difference between this comparative example and Example 1 is that a single functional group active diluent is used. Other steps and parameters are the same as in Example 1. Specifically:

[0153] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0154] 15 parts of pure acrylic resin (Changxing 65328);

[0155] Five parts of polyurethane acrylate resin (Changxing 6113);

[0156] Five parts of polybutadiene acrylate (Sartomer CN307 NS);

[0157] 29.6 parts of isoborneol acrylate;

[0158] 10 parts lauryl acrylate;

[0159] 28 parts of trimethylcyclohexyl acrylate;

[0160] 1 part of 2-isopropylthioxanthone (ITX)

[0161] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0162] 1.5 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0163] 0.5 parts of ethyl 4-dimethylaminobenzoate (EDAB);

[0164] Leveling agent (BYK-333) 0.4 parts;

[0165] 1 part of trimethylolpropane tris(3-mercaptopropionic acid) ester (TMMP).

[0166] Comparative Example 4

[0167] The difference between this comparative example and Example 2 is that the additive does not contain thiol compounds. Other steps and parameters are the same as in Example 2. Specifically:

[0168] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0169] 20 parts of pure acrylic resin (Changxing DR-A830);

[0170] 10 parts of polybutadiene acrylate (Osaka Organic Chemicals BAC-45);

[0171] 20 parts of isoborneol acrylate;

[0172] 9 parts lauryl acrylate;

[0173] 11 parts of trimethylcyclohexyl acrylate;

[0174] 10 parts of 1,12-dodecyl glycol diacrylate;

[0175] 9 parts of polyethylene glycol diacrylate;

[0176] 1 part of trimethylolpropane triacrylate (TMPTA);

[0177] Acryloylmorpholine (ACMO) 3.6 parts;

[0178] 1 part of 2-isopropylthioxanthone (ITX);

[0179] 3 parts of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0180] 2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (907);

[0181] Leveling agent (BYK-358N) 0.4 parts.

[0182] Comparative Example 5

[0183] The difference between this comparative example and Example 2 is that a single photoinitiator is used (i.e., only acylphosphine oxide photoinitiators are used, excluding thioxanthone photoinitiators and α-aminoketone photoinitiators). Other steps and parameters are the same as in Example 2. Specifically:

[0184] An edge-insulating and protective photocurable inkjet printing ink, the raw materials for which are prepared are composed of the following components in parts by mass:

[0185] 20 parts of pure acrylic resin (Changxing DR-A830);

[0186] 10 parts of polybutadiene acrylate (Osaka Organic Chemicals BAC-45);

[0187] 20 parts of isoborneol acrylate;

[0188] 9 parts lauryl acrylate;

[0189] 10 parts of trimethylcyclohexyl acrylate;

[0190] 10 parts of 1,12-dodecyl glycol diacrylate;

[0191] 9 parts of polyethylene glycol diacrylate;

[0192] 1 part of trimethylolpropane triacrylate (TMPTA);

[0193] Acryloylmorpholine (ACMO) 3.6 parts;

[0194] 6 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819);

[0195] Leveling agent (BYK-358N) 0.4 parts;

[0196] One part of pentaerythritol tetrakis(3-mercaptopropionic acid) (PETMP).

[0197] Performance testing and results analysis:

[0198] The edge-insulating protective photocurable inkjet inks prepared in Examples 1-4 can be precisely coated onto the edge of the electrode sheet using an inkjet printer (coating line width of 5 mm), and after being irradiated by a UV-LED light source, an insulating protective layer (width of 5 mm) is formed. The measured width deviation is ≤ ±0.2 mm. This demonstrates that the edge-insulating protective photocurable inkjet ink of this application can achieve precise control of the coating width at the edge of the electrode sheet.

[0199] The edge-insulating protective photocurable ink prepared in Example 1 was coated onto the entire electrode sheet (aluminum foil current collector) using an inkjet printer. After being irradiated by a UV-LED light source, a whole insulating protective layer was formed. The electrode sheet was then folded in half along two opposite sides and fixed in place. The result is as follows: Figure 1 As shown. By Figure 1 It is known that the edge-insulating protective photocurable ink coating of the present invention has the characteristic of not cracking when folded.

[0200] The edge-insulating protective photocurable inkjet inks prepared in Example 1 and Comparative Examples 1-2 were subjected to infrared spectral analysis, and the results are as follows: Figure 2 As shown. At ~1640cm -1 The nearby (moderate intensity) peak represents the C=C double bond stretching vibration, belonging to the C=C unit of an olefin. (This peak is more pronounced with higher olefin content and may be weaker with lower olefin content. Note that if the double bond is conjugated (e.g., in a 1,4-addition structure), the peak position will shift slightly to a lower wavenumber (~1620 cm⁻¹).) -1 Furthermore, the strength increases, and the cis-1,4 structure reaches ~740cm. -1 (There is an absorption peak nearby). And by Figure 2 It can be seen that at 1630cm -1 Near the C=C double bond stretching vibration peak, the absorption peak intensity of Example 1 is significantly lower than that of Comparative Example 2. The out-of-plane bending vibration of the C=C bond is affected by the steric hindrance of the copolymer chain segment, and the vibration frequency is dispersed. At the same time, the consumption of double bonds leads to the reduction of peak intensity. This indicates that the 1,2-vinyl double bond of polybutadiene acrylate in Example 1 has undergone a highly efficient copolymerization reaction with the C=C double bond of acrylate resin / monomer, forming a cross-linked network.

[0201] The edge-insulating protective photocurable inkjet inks prepared in Examples 1-4 and Comparative Examples 1-5 were subjected to relevant performance tests, and the results are shown in Table 1 below.

[0202] Table 1:

[0203]

[0204] As shown in Table 1 above, the inks of Examples 1-4 of this invention all possess excellent comprehensive performance: viscosity is suitable for inkjet printing processes (58-65 mPa). It exhibits excellent curing speed (2.0-3.0s), satisfactory flexibility (no cracking after three consecutive 180° folds), excellent adhesion (5B), and high volume resistivity (1.8×10⁻⁶). 15 -3.1×10 15 Ω The printing accuracy was satisfactory (deviation ≤ ±0.16mm), with no stacking or adhesion. Furthermore, Examples 1-4 all achieved "three consecutive 180° folds without cracking," with an elongation at break of 45%-90%. In contrast, Comparative Example 1 (lacking polyolefin acrylate) showed micro-cracks after the second fold, and the elongation at break decreased from 90% in Example 1 to 75%. This is because the olefin segments of the polyolefin acrylate impart high flexibility to the coating, synergistically mitigating crosslinking brittleness with other resins; their absence makes it unable to withstand winding and bending stress. The volume resistivity of Examples 1-4 reached 1.8 × 10⁻⁶. 15 -3.1×10 15 Ω cm, while Comparative Example 1 is only 1.0 × 10 cm. 14 Ω cm (a decrease of one order of magnitude). This is because the electrical insulation properties of polyolefin acrylate synergistically form with the dense cross-linked network of other resins, blocking ion / electron migration channels, an effect that a single resin system cannot achieve. Comparative Example 2 (single polyolefin acrylate) showed "slight adhesion," while Examples 1-4 showed no adhesion. This is because polyurethane acrylate and pure acrylate resin optimized the coating surface energy and film density, avoiding adhesion problems caused by uncured groups remaining on the surface of the single polyolefin acrylate coating. Therefore, it is evident that the photocurable prepolymer compound system, through the synergy of its components, simultaneously ensures flexibility, insulation, and anti-adhesion properties, which a single resin system cannot achieve simultaneously.

[0205] As shown in Table 1, the curing speed of Examples 1-4 was only 2.0-3.0 s, while that of Comparative Example 3 was as long as 10 s (3-5 times slower). This is because bifunctional monomers (such as 1,10-decanediol diacrylate) construct a linear crosslinking network, which, in conjunction with the photoinitiator, accelerates chain growth; while single monofunctional monomers have low crosslinking efficiency and require a longer curing time. In addition, Comparative Example 3 showed "severe adhesion," while Examples 1-4 showed no adhesion. This is because the crosslinking density of single monofunctional monomers is insufficient, leaving unreacted groups on the coating surface, which are prone to intermolecular adsorption when stacked and compressed; while the gradient functional group (monofunctional acrylate + bifunctional acrylate + trifunctional acrylate) system forms a dense and flexible crosslinking network with no residual active groups on the surface. The printing width deviation of Comparative Example 3 was ±0.22 mm (exceeding the standard), and the adhesion was only 4B; the deviation of Examples 1-4 was ≤±0.16 mm (qualified), and the adhesion was 5B. Because monofunctional monomers cannot precisely adjust ink viscosity and film leveling, they cause boundary diffusion during printing and insufficient adhesion between the coating and the substrate. Gradient functional group systems, through the synergy of monomers with different molecular structures, not only meet the hydrodynamic requirements of printing but also enhance the interfacial bonding between the coating and the electrode current collector. Therefore, gradient functional group monomer systems are key to achieving "rapid curing, precise printing, no sticking, and high adhesion," while monofunctional group systems suffer from multiple performance defects.

[0206] As shown in Table 1, the curing speed of Examples 1-4 was 2.0-3.0 s, the curing speed of Comparative Example 4 (without thiol) was 3 s (incomplete surface curing), and the curing speed of Comparative Example 5 (single photoinitiator) was 4 s (low initiation efficiency). This is because thiol additives can capture oxygen free radicals and regenerate active free radicals, compensating for the oxygen inhibition defects of traditional photocuring; composite photoinitiators (such as ITX+819+907) cover different UV wavelengths, synergistically improving initiation efficiency, while single photoinitiators cannot adapt to full-band irradiation, limiting the initiation rate. Comparative Example 4 (without thiol) showed "severe adhesion", Comparative Example 5 (single photoinitiator) showed "slight adhesion", and Examples 1-4 showed no adhesion. This is because the thiol additive ensured rapid surface curing of the coating (no stickiness), and the composite photoinitiator ensured uniform curing, avoiding stacking and adsorption caused by undried surfaces; while Comparative Example 4 had residual active groups on the surface due to oxygen inhibition, and Comparative Example 5 had residual unreacted monomers due to insufficient curing, both causing adhesion. Therefore, the synergy between composite photoinitiators and thiol additives is the key to solving oxygen inhibition polymerization, achieving rapid curing and no adhesion. A single photoinitiator or the absence of thiol additives cannot meet production requirements.

[0207] As shown in Table 1, the width deviation of Examples 1-4 was ≤ ±0.16 mm (qualified), while that of Comparative Example 3 was ±0.22 mm (exceeding the standard) and Comparative Example 5 was ±0.21 mm (close to exceeding the standard). This is because the examples, through the combination of "prepolymer + graded functional monomers", not only controlled the viscosity at 55-65 mPa The inkjet printing adaptation range of s is optimized, and the thixotropic and leveling properties of the ink are also improved, ensuring stable droplet formation and clear boundaries during printing. While Comparative Examples 3 (single monomer) and 5 (single photoinitiator) meet the viscosity requirements, their poor component synergy leads to droplet diffusion or uneven adhesion during printing. Examples 1-4, using inkjet printing, can accurately locate the coating area at the edge of the electrode (width adjustable from 2-15mm), with a measured deviation ≤ ±0.16mm and a material utilization rate close to 100%. Traditional coating processes (such as tape coating in the background art) suffer from problems such as difficulty in range control and material waste. The precision defects of Comparative Examples 3-5 further prove that only the component design of this invention can match the high precision requirements of inkjet printing. Therefore, the viscosity design and component synergy of this invention achieve "high precision, high utilization, and no waste" in inkjet printing, an effect that traditional processes and inappropriate component designs cannot achieve.

[0208] As shown in Table 1, the volume resistivity of Examples 1-4 reaches 1.8 × 10⁻⁴. 15 -3.1×10 15 Ω cm, much higher than Comparative Example 1 (1.0 × 10 cm). 14 Comparative Example 3 (1.5 × 10) 14 Comparative Example 4 (1.3 × 10) 14 This is because the nonpolar segments of the functionalized polymers containing polyolefin oligomers and / or polyolefin acrylates in Examples 1-4 form a compatible system with the ester groups of the acrylate monomers, exhibiting no delamination and a dense cross-linked network. In contrast, Comparative Examples 1 and 3-4, due to improper component matching (such as the absence of polyolefin oligomers / polyolefin acrylates and single-functional-group active diluents), suffer from insufficient cross-linking or poor compatibility, resulting in a significant decrease in insulation performance. The coatings in Examples 1-4 show no penetration or erosion of the electrode, while Comparative Example 3 (with a single-functional-group active diluent) may have a slight risk of penetration due to poor compatibility between the active diluent and the substrate (indirectly manifested as a decrease in adhesion to 4B). This is because the active diluents in Examples 1-4 are tightly cross-linked and intertwined with the photocurable prepolymer, preventing free monomers from penetrating into the electrode interior and avoiding problems such as substrate swelling and reaction damage. Therefore, the component compatibility design of this invention ensures high insulation and substrate protection of the coating, providing a guarantee for stable battery performance.

[0209] As shown in Table 1, Examples 1-4 exhibit fast curing speed (2-3 seconds) and no adhesion, making them suitable for high-speed stacking in automated production lines. In contrast, Comparative Examples 3 (curing for 10 seconds), 4 (severe adhesion), and 5 (slight adhesion) lead to decreased production efficiency and even affect battery assembly accuracy. The flexibility (no cracking when folded), abrasion resistance, and corrosion resistance of Examples 1-4 allow them to adapt to conditions such as electrode winding, bending, and stacking under pressure. However, Comparative Examples 1 (cracking when folded) and 5 (micro-cracks when folded) are prone to coating failure during battery cycling, leading to electrode short circuits or structural damage and shortening battery life. Therefore, the ink of this invention fully meets the production and usage requirements of solid-state batteries, significantly improving battery assembly efficiency, structural stability, and lifespan, demonstrating extremely high application value.

[0210] In summary, through precise comparison of the embodiments and comparative examples, each core technology design (photocurable prepolymer compound, gradient functionality monomer reactive diluent, composite photoinitiator + thiol additive, viscosity adaptation) is directly supported by performance data. The problems observed in the comparative examples, such as "insufficient flexibility, slow curing, adhesion, poor insulation, and exceeding printing accuracy standards," precisely demonstrate the originality and necessity of the technical solution of this invention. The beneficial effects are not isolated but rather form an organic whole through component synergy and process adaptation, comprehensively solving the pain points of existing technologies.

[0211] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An edge-insulating and protective photocurable inkjet printing ink, characterized in that, The raw materials of the ink, by weight, include: 20-60 parts of photocurable prepolymer, 30-70 parts of reactive diluent, 1-8 parts of photoinitiator, and 0.4-3 parts of additives; wherein, the photocurable prepolymer includes functionalized polymers containing polyolefin oligomers and / or polyolefin acrylates, and also includes at least one of polyurethane acrylate resin, pure acrylate resin, epoxy acrylate resin, and polyester acrylate resin; the reactive diluent includes monofunctional acrylates and polyfunctional acrylates; the photoinitiator includes at least two of α-hydroxy ketone photoinitiators, acylphosphine oxide photoinitiators, thioxanthone photoinitiators, and α-amino ketone photoinitiators; and the additives are leveling agents and thiol compounds.

2. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, In the functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates, the polyolefin oligomers are polymers formed by polymerization of olefin monomers; the olefins include at least one of ethylene, propylene, and butene.

3. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, In the functionalized polymer containing polyolefin oligomers and / or polyolefin acrylates, the polyolefin acrylate is an oligomer with an olefin backbone in its molecular backbone and acrylate functional groups for UV curing branched at its ends or sides; wherein the olefin backbone includes at least one of polybutadiene, polyisoprene, and ethylene propylene rubber.

4. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, The monofunctional acrylates include at least one of isobornyl acrylate, isobornyl methacrylate, lauryl acrylate, isooctyl acrylate, isodecanyl acrylate, 2-phenoxyethyl acrylate, ethoxylated nonylphenol acrylate, trimethylcyclohexyl acrylate, tetrahydrofurfuryl acrylate, cyclotrimethylolpropane formal acrylate, acryloylmorpholine, and vinylmethyl oxazolidinone; the polyfunctional acrylates include at least one of 1,6-hexanediol diacrylate, 1,12-dodecanediol diacrylate, 1,10-decanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, tripropylene glycol diacrylate, tetraethylene glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, and propoxylated trimethylolpropane triacrylate.

5. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, The α-hydroxyketone photoinitiator includes hydroxycyclohexanephenyl ketone; the acylphosphine oxide photoinitiator includes at least one of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and (2,4,6-trimethylbenzoyl)-diphenylphosphine oxide; the thioxanthone photoinitiator includes at least one of 2-isopropylthioxanthone and 2,4-diethylthioxanthone; the α-aminoketone photoinitiator includes 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

6. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, The raw materials of the ink also include a co-initiator; the co-initiator is an aminobenzoic acid ester compound; the aminobenzoic acid ester compound is ethyl 4-dimethylaminobenzoate.

7. The edge-insulating and protective photocurable inkjet printing ink according to claim 1, characterized in that, The leveling agent is at least one of acrylic leveling agents and silicone leveling agents; the thiol compound includes at least one of mercaptoethanol, trimethylolpropane tris(3-mercaptopropionic acid) ester, and pentaerythritol tetrakis(3-mercaptopropionic acid) ester.

8. The method for preparing the edge-insulating protective photocurable inkjet printing ink according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Under a light-protected / yellow light environment, add the photocurable prepolymer, reactive diluent, photoinitiator and additives to a dispersion tank and stir at room temperature to obtain a homogeneous and transparent mixture; S2. The mixture is filtered sequentially through a filter device with pore sizes of 1 μm, 0.45 μm and 0.22 μm to obtain the edge-insulating protective photocurable inkjet ink.

9. The method for preparing the edge-insulating and protective photocurable inkjet printing ink according to claim 8, characterized in that, In step S1, the stirring speed is 300-500 rpm and the stirring time is 60-90 min.

10. The application of the edge insulation protective photocurable inkjet printing ink according to any one of claims 1-7 in the edge insulation protection of solid-state lithium battery electrodes, characterized in that, The ink is applied to the edge of the electrode using an inkjet printer and then irradiated by a UV-LED light source to form an insulating protective layer; the width of the coating is 2-15mm.

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