CN115064653A - Safe gel lithium ion battery for energy storage and preparation method thereof - Google Patents
Safe gel lithium ion battery for energy storage and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a safe gel lithium ion battery for energy storage and a preparation method thereof, wherein the preparation method comprises the preparation of a positive pole piece, wherein a positive pole main material, a positive pole main binder, a positive pole auxiliary binder and a negative pole positive pole conductive agent are uniformly mixed according to the mass ratio of 94:1.5:1.5:3, and are dissolved in an organic solvent NMP according to the solid content of 45-55% to form stable positive pole slurry. The gluing diaphragm coated with the polyvinylidene fluoride-hexafluoropropylene and the aluminum oxide is beneficial to the liquid absorption and retention functions of the electrolyte, improves the fitting property of the positive and negative electrode interfaces and the diaphragm, and is beneficial to improving the stability of the positive and negative electrode interfaces in the long-cycle process of the battery; and the electrolyte with the gel initiator and the flame retardant additive is injected twice, and the heat generated in the charging and discharging process of the battery is utilized to realize the gelation transformation of the diaphragm, thereby being beneficial to improving the safety of the battery in the long-cycle process.
Description
Technical Field
The invention relates to the technical field of secondary lithium ion batteries, in particular to a safe gel lithium ion battery for energy storage and a preparation method thereof.
Background
The lithium ion battery electrolyte widely used in the current market is prepared by mixing LiPF6 as lithium salt and various ester solvents as composite solvents, and the materials are extremely unstable under the conditions of battery abuse, internal short circuit, overcharge, overdischarge and the like, are extremely easy to decompose and generate abnormal gas, so that the safety accidents of battery combustion, explosion and the like are caused, namely the problems of easy combustion and poor safety and stability of the electrolyte of the existing lithium ion battery exist.
Disclosure of Invention
The invention mainly aims to provide a safe gel lithium ion battery for energy storage and a preparation method thereof, and aims to solve the problems of easy combustion and poor safety and stability of the electrolyte of the conventional lithium ion battery.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a safe gel lithium ion battery for energy storage is provided, the gel lithium ion battery is composed of a shell, a positive pole piece, a positive pole lug, a negative pole piece, a negative pole lug, electrolyte and a gluing diaphragm, and the preparation method comprises the following steps:
s1, preparing a positive pole piece, namely uniformly mixing a positive pole main material, a positive pole main binder, a positive pole auxiliary binder and a negative pole positive pole conductive agent according to the mass ratio of 94:1.5:1.5:3, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable positive pole slurry; then, uniformly coating the anode slurry on the surface of the clean aluminum foil; placing the aluminum foil coated with the anode slurry in an oven for drying so as to form an anode auxiliary binder distribution layer with concentration gradient on the surface of the aluminum foil; preparing a positive pole piece through rolling, slitting and die cutting processes;
s2, preparing a negative pole piece, namely uniformly mixing a negative pole main material, a negative pole main binder, a negative pole auxiliary binder and a negative pole conductive agent according to the mass ratio of 96:1.5:1.5:1, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable negative pole slurry; then, uniformly coating the negative electrode slurry on the surface of the clean copper foil; placing the copper foil coated with the negative electrode slurry in an oven for drying so as to form a negative electrode auxiliary binder distribution layer with concentration gradient on the near-surface layer of the coating; preparing a negative pole piece through the processes of rolling, slitting and die cutting;
s3, preparing a gluing diaphragm, namely dispersing polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), aluminum oxide (Al 2O 3) and a pore-forming agent auxiliary material in an NMP organic solvent to form a stable gluing sizing material; then, uniformly coating the sizing material on the diaphragm base film, coating the two sides of the diaphragm base film, and drying to form a sizing material coated sizing diaphragm;
s4, preparing a gel lithium ion battery, namely stacking a negative pole piece, a gluing diaphragm and a positive pole piece in sequence to assemble a battery core, baking to remove moisture, flatly welding a positive pole lug and a negative pole lug with the positive pole piece and the negative pole piece respectively, packaging the battery core, the positive pole lug and the negative pole lug by using a shell to form the battery, and then carrying out an electrolyte injection process; and then forming the gel lithium ion battery.
Preferably, in step S1, the positive main binder and the positive auxiliary binder are both polyvinylidene fluoride (PVDF), the molecular weight of the positive main binder polyvinylidene fluoride (PVDF) is not less than 90 ten thousand, and the molecular weight of the positive auxiliary binder polyvinylidene fluoride (PVDF) is not more than 60 ten thousand; the positive electrode main material is any one of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickelate, lithium manganate and lithium cobaltate; the positive electrode conductive agent is one or a combination of more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene.
Preferably, in step S2, the negative main binder and the negative auxiliary binder are both polyvinylidene fluoride (PVDF), and the molecular weight of the negative main binder polyvinylidene fluoride (PVDF) is not less than 90 ten thousand, and the molecular weight of the negative auxiliary binder polyvinylidene fluoride (PVDF) is not more than 60 ten thousand; the main material of the negative electrode is one of artificial graphite and natural graphite; the negative electrode conductive agent is one or a combination of more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene.
Preferably, in the step S3, the mass parts of the polyvinylidene fluoride-hexafluoropropylene are 55 to 85%, the mass part of the aluminum oxide (Al 2O 3) is 15 to 35%, the mass part of the pore-forming agent auxiliary material is 2 to 15%, and the pore-forming agent auxiliary material is aluminum chloride (LiCl) or sodium chloride (NaCl).
Preferably, in the step S3, the thickness of the single-sided coating is 1-3 μm; the diaphragm base film is one of a polyolefin film, a polyimide film and a non-woven fabric.
Preferably, in the step S4, the casing for packaging may be a soft-package aluminum-plastic film or a square aluminum casing; the electrolyte injection process comprises two times of injection: the first injection amount is 70-90%, and the second injection amount is 10-30%; after the first injection, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is kept stand in a high temperature environment of 50 +/-5 ℃, then is pre-charged to 50% of SOC, then is subjected to second injection, when the second injection is carried out, the electrolyte, the flame retardant additive, the gel monomer and the gel initiator are uniformly mixed according to the proportion and then is injected into the battery core, after the second injection is completed, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is aged in a high temperature environment of 50 +/-5 ℃, then is charged to 100% of SOC, and is converted into a constant volume; the aluminum plastic film soft package battery core formed by packaging with the soft package aluminum plastic film is sealed after primary liquid injection, the battery core is stood in a normal temperature environment of 25 +/-5 ℃, then stood in a high temperature environment of 50 +/-5 ℃, the battery core is pre-charged to 50% of SOC, then is aged in a high temperature environment of 50 +/-5 ℃, secondary liquid injection is performed after the aging is completed, electrolyte of the secondary liquid injection is uniformly mixed with a flame retardant additive, a gel monomer and a gel initiator, standing is performed for 24 hours in a normal temperature environment of 25 +/-5 ℃ after the secondary liquid injection is completed, the battery core is charged to 100% of SOC, then is stood in a normal temperature environment of 25 +/-5 ℃, is aged in a high temperature environment of 50 +/-5 ℃, is rolled for degassing, and is formed into a constant volume to obtain the target battery core.
Preferably, during the second injection, the volume ratio of the flame retardant additive mixed with the electrolyte is 3-8% of the total injection amount; the flame retardant additive is ethoxy (pentafluoro) cyclotriphosphazene (PFPN), and the addition amount is 5% of the total injection amount by volume; the gel monomer is pentaerythritol acrylate (PETMA), and the addition amount is 10 percent of the total injection amount; the gel initiator is azodiisobutyronitrile, and the addition amount of the gel initiator is 0.1-1.0% of the total mass of the liquid injection amount.
The invention also provides a safety gel lithium ion battery prepared by the method and used for energy storage.
Compared with the prior art, the invention has the following beneficial effects:
1. on the premise of not changing the existing battery preparation process, the invention creatively provides that the preparation of the battery cell gel electrolyte is realized by optimizing the positive and negative electrode structures in the battery cell preparation process; the method is mainly characterized in that the auxiliary binder is used for segregating polyvinylidene fluoride with lower molecular weight in the process of coating when an organic solvent NMP oven is dried, and finally the gathering of polyvinylidene fluoride F on the near-surface layer of a pole piece is realized, meanwhile, the gluing diaphragm coated with polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and aluminum oxide (Al 2O 3) adopted by the method is beneficial to the liquid absorption and retention functions of electrolyte, the adhesion between a positive interface and a negative interface and the diaphragm is improved, and the stability of the positive interface and the negative interface in the long-circulating process of the battery is improved; in addition, in the process of forming the battery cell, a flame retardant additive, namely ethoxy (pentafluoro) cyclotriphosphazene (PFPN), a gel monomer pentaerythritol acrylate (PETMA) and a gel initiator (azobisisobutyronitrile), is creatively proposed to be added after the pre-charging of the battery cell is finished; because gel monomer pentaerythritol acrylate (PETMA) and gel initiator (azodiisobutyronitrile) can be flocculated on the surface of the diaphragm well, and have synergistic effect with PVDF to achieve good adhesiveness; the adhesive interface has good liquid absorption and retention functions on the electrolyte. The gel monomer is polymerized when the positive and negative electrode interfaces are heated to form stable gel, and the fire retardant ethoxy (pentafluoro) cyclotriphosphazene has three elements of phosphorus, fluorine and nitrogen, so that the fire retardant effect can be synergistically exerted, and meanwhile, the fluorine element can well protect an SEI film. When the battery core is heated, PFPN can decompose active phosphorus, prevent chain reaction of thermal runaway, and generate non-combustible gas; the PFPN additive has little influence on the electrolyte property and the charge and discharge performance of the battery cell, and has almost no obvious side reaction. The invention adopts twice liquid injection, the second time is filled with the electrolyte of the gel initiator and the flame retardant additive, and the gelation transformation of the diaphragm is realized by utilizing the heat generated in the charging and discharging process of the battery. The method is favorable for improving the safety of the battery in the long-circulating process.
Drawings
FIG. 1 is a flow chart of a method for preparing a safety gel lithium ion battery for energy storage according to the present invention;
FIG. 2 is a cross-sectional SEM image of a positive electrode plate;
FIG. 3 is a front SEM image of the positive electrode plate;
fig. 4 is a graph showing a first charge and discharge curve.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
As shown in fig. 1 to 4, a method for preparing a safe gel lithium ion battery for energy storage, the gel lithium ion battery comprises a shell, a positive electrode plate, a positive electrode tab, a negative electrode plate, a negative electrode tab, an electrolyte and a glue-coated diaphragm, and the method comprises the following steps:
s1, preparing a positive pole piece, namely uniformly mixing a positive pole main material, a positive pole main binder, a positive pole auxiliary binder and a negative pole positive pole conductive agent according to the mass ratio of 94:1.5:1.5:3, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable positive pole slurry; then, uniformly coating the anode slurry on the surface of the clean aluminum foil; placing the aluminum foil coated with the anode slurry in an oven for drying, wherein in the drying process, the anode auxiliary binder is segregated by a solvent NMP to form an anode auxiliary binder distribution layer with concentration gradient on the surface of the aluminum foil, and the auxiliary binder on the outermost layer is distributed most; preparing a positive pole piece with a proper size through the processes of rolling, slitting and die cutting;
s2, preparing a negative pole piece, namely uniformly mixing a negative pole main material, a negative pole main binder, a negative pole auxiliary binder and a negative pole conductive agent according to the mass ratio of 96:1.5:1.5:1, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable negative pole slurry; then, uniformly coating the negative electrode slurry on the surface of the clean copper foil; placing the copper foil coated with the negative electrode slurry in an oven for drying, wherein in the drying process, the negative electrode auxiliary binder is segregated by a solvent NMP to form a negative electrode auxiliary binder distribution layer with concentration gradient on the near-surface layer of the coating film, and the auxiliary binder on the outermost layer is distributed most; preparing a negative pole piece with a proper size through rolling, slitting and die cutting;
s3, preparing a gluing diaphragm, namely dispersing polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), aluminum oxide (Al 2O 3) and a pore-forming agent auxiliary material in an NMP organic solvent to form a stable gluing sizing material; then, uniformly coating the sizing material on the diaphragm base film, coating the two sides of the diaphragm base film, and drying to form a sizing material coated sizing diaphragm;
s4, preparing a gel lithium ion battery, namely stacking a negative pole piece, a gluing diaphragm and a positive pole piece in sequence to assemble a battery core, baking to remove moisture, flatly welding a positive pole lug and a negative pole lug with the positive pole piece and the negative pole piece respectively, packaging the battery core, the positive pole lug and the negative pole lug into a shell to form the battery, and then carrying out an electrolyte injection process; and then forming the gel lithium ion battery.
In step S1, the positive main binder and the positive auxiliary binder are both polyvinylidene fluoride (PVDF), the molecular weight of the positive main binder polyvinylidene fluoride (PVDF) is not less than 90 ten thousand, and the molecular weight of the positive auxiliary binder polyvinylidene fluoride (PVDF) is not more than 60 ten thousand; the positive electrode main material is any one of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickelate, lithium manganate and lithium cobaltate; the main material of the anode is preferably lithium iron phosphate; selecting the positive electrode conductive agent as one or more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene; the anode conductive agent is preferably a composite conductive agent with the mass ratio of the carbon nano tube to the conductive carbon fiber being 1: 1.
In the step S2, the negative electrode main binder and the negative electrode auxiliary binder are both polyvinylidene fluoride (PVDF), and the molecular weight of the negative electrode main binder polyvinylidene fluoride (PVDF) is not less than 90 ten thousand, and the molecular weight of the negative electrode auxiliary binder polyvinylidene fluoride (PVDF) is not more than 60 ten thousand; the main material of the negative electrode is one of artificial graphite and natural graphite; the main material of the negative electrode is preferably artificial graphite; the negative electrode conductive agent is one or a combination of more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene; the negative electrode conductive agent is preferably a composite conductive agent with the mass ratio of the carbon nano tube to the conductive carbon fiber being 1: 1.
In the step S3, the mass parts of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) are 55 to 85%, the mass parts of aluminum oxide (Al 2O 3) are 15 to 35%, the mass parts of the pore-forming agent auxiliary material are 2 to 15%, and the pore-forming agent auxiliary material is aluminum chloride (LiCl) or sodium chloride (NaCl).
In the step S3, the thickness of the single-side coating is 1-3 μm; the separator base film may be one of a polyolefin film, a polyimide film and a non-woven fabric, preferably a 12 μm non-woven fabric or polyolefin film.
In the step S4, in the step S4, the case for packaging is a soft-packed aluminum-plastic film or a square aluminum case; the electrolyte injection process comprises two times of injection: the first injection amount is 70-90%, and the second injection amount is 10-30%; after the first injection, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is kept stand in a high temperature environment of 50 +/-5 ℃, then is pre-charged to 50% of SOC, then is subjected to second injection, when the second injection is carried out, the electrolyte, the flame retardant additive, the gel monomer and the gel initiator are uniformly mixed according to the proportion and then is injected into the battery core, after the second injection is completed, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is aged in a high temperature environment of 50 +/-5 ℃, then is charged to 100% of SOC, and is converted into a constant volume; the aluminum plastic film soft package battery core formed by packaging with the soft package aluminum plastic film is sealed after primary liquid injection, the battery core is stood in a normal temperature environment of 25 +/-5 ℃, then stood in a high temperature environment of 50 +/-5 ℃, the battery core is pre-charged to 50% of SOC, then is aged in a high temperature environment of 50 +/-5 ℃, secondary liquid injection is performed after the aging is completed, electrolyte of the secondary liquid injection is uniformly mixed with a flame retardant additive, a gel monomer and a gel initiator, standing is performed for 24 hours in a normal temperature environment of 25 +/-5 ℃ after the secondary liquid injection is completed, the battery core is charged to 100% of SOC, then is stood in a normal temperature environment of 25 +/-5 ℃, is aged in a high temperature environment of 50 +/-5 ℃, is rolled for degassing, and is formed into a constant volume to obtain the target battery core. During the second injection, the volume ratio of the flame retardant additive mixed with the electrolyte is 3-8% of the total injection amount; the flame retardant additive is ethoxy (pentafluoro) cyclotriphosphazene (PFPN), and the addition amount is 5% of the total injection amount by volume; the gel monomer is pentaerythritol acrylate (PETMA), and the addition amount is 10 percent of the total injection amount; the gel initiator is azodiisobutyronitrile, and the addition amount of the gel initiator is 0.1-1.0% of the total mass of the liquid injection amount. The charging process is shown in the table below.
It should be further noted that, as shown in fig. 2, fig. 2 is a cross-sectional SEM image of the positive electrode sheet, and it can be clearly seen that polyvinylidene fluoride (PVDF) segregates to the surface and near surface of the electrode sheet along with the drying process of solvent NMP, so that the surface and near surface of the electrode sheet are more compact under the action of the polyvinylidene fluoride (PVDF); as shown in fig. 3, fig. 3 is a front SEM image of the positive electrode plate, and it can be seen that polyvinylidene fluoride (PVDF) is uniformly dispersed on the surface of the plate, and the components of the slurry are uniformly distributed. The first effect of the target battery assembled by adopting the positive and negative electrode plates prepared by the invention is still 89% after formation, as shown in fig. 4.
The invention further provides a safe gel lithium ion battery for energy storage prepared by the method.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A preparation method of a safe gel lithium ion battery for energy storage is provided, the gel lithium ion battery is composed of a shell, a positive pole piece, a positive pole lug, a negative pole piece, a negative pole lug, electrolyte and a gluing diaphragm, and is characterized in that the preparation method comprises the following steps:
s1, preparing a positive pole piece, namely uniformly mixing a positive pole main material, a positive pole main binder, a positive pole auxiliary binder and a negative pole positive pole conductive agent according to the mass ratio of 94:1.5:1.5:3, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable positive pole slurry; then, uniformly coating the anode slurry on the surface of the clean aluminum foil; placing the aluminum foil coated with the anode slurry in an oven for drying so as to form an anode auxiliary binder distribution layer with concentration gradient on the surface of the aluminum foil; preparing a positive pole piece through the working procedures of rolling, slitting and die cutting;
s2, preparing a negative pole piece, namely uniformly mixing a negative pole main material, a negative pole main binder, a negative pole auxiliary binder and a negative pole conductive agent according to the mass ratio of 96:1.5:1.5:1, and dissolving the mixture in an organic solvent NMP according to the solid content of 45-55% to form stable negative pole slurry; then, uniformly coating the negative electrode slurry on the surface of the clean copper foil; drying the copper foil coated with the negative electrode slurry in an oven to form a negative electrode auxiliary binder distribution layer with concentration gradient on the near surface layer of the coating; preparing a negative pole piece through the processes of rolling, slitting and die cutting;
s3, preparing a gluing diaphragm, namely dispersing polyvinylidene fluoride-hexafluoropropylene, aluminum oxide and a pore-forming agent auxiliary material in an NMP organic solvent to form a stable gluing sizing material; then, uniformly coating the sizing material on the diaphragm base film, coating the two sides of the diaphragm base film, and drying to form a sizing material coated sizing diaphragm;
s4, preparing a gel lithium ion battery, namely stacking a negative pole piece, a gluing diaphragm and a positive pole piece in sequence to assemble a battery core, baking to remove moisture, flatly welding a positive pole lug and a negative pole lug with the positive pole piece and the negative pole piece respectively, packaging the battery core, the positive pole lug and the negative pole lug by using a shell to form the battery, and then carrying out an electrolyte injection process; and then forming the gel lithium ion battery.
2. The method of claim 1, wherein in step S1, the positive main binder and the positive auxiliary binder are both polyvinylidene fluoride, and the molecular weight of the positive main binder polyvinylidene fluoride is not less than 90 ten thousand, and the molecular weight of the positive auxiliary binder polyvinylidene fluoride is not more than 60 ten thousand; the positive electrode main material is any one of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickelate, lithium manganate and lithium cobaltate; the positive electrode conductive agent is one or a combination of more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene.
3. The method for preparing the energy-storing safety gel lithium ion battery according to claim 1, wherein in step S2, the negative electrode main binder and the negative electrode auxiliary binder are both polyvinylidene fluoride, and the molecular weight of the negative electrode main binder polyvinylidene fluoride is not less than 90 ten thousand, and the molecular weight of the negative electrode auxiliary binder polyvinylidene fluoride is not more than 60 ten thousand; the main material of the negative electrode is one of artificial graphite and natural graphite; the negative electrode conductive agent is one or a combination of more of conductive carbon black, carbon nano tubes, conductive carbon fibers and conductive graphene.
4. The method of claim 1, wherein in step S3, the mass parts of pvdf-hexafluoropropylene are 55-85%, the mass parts of alumina are 15-35%, the mass parts of pore-forming agent auxiliary material are 2-15%, and the pore-forming agent auxiliary material is aluminum chloride or sodium chloride.
5. The method for preparing the energy-storing safety gel lithium ion battery according to claim 1, wherein in the step S3, the thickness of the single-sided coating is 1-3 μm; the diaphragm base film is one of a polyolefin film, a polyimide film and a non-woven fabric.
6. The method for preparing a safety gel lithium ion battery for energy storage according to claim 1, wherein in step S4, the casing for packaging is a soft package aluminum plastic film or a square aluminum casing; the electrolyte injection process comprises two times of injection: the first injection amount is 70-90%, and the second injection amount is 10-30%; after the first injection, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is kept stand in a high temperature environment of 50 +/-5 ℃, then is pre-charged to 50% of SOC, then is subjected to second injection, when the second injection is carried out, the electrolyte, the flame retardant additive, the gel monomer and the gel initiator are uniformly mixed according to the proportion and then is injected into the battery core, after the second injection is completed, the battery core is kept stand in a normal temperature environment of 25 +/-5 ℃, then is aged in a high temperature environment of 50 +/-5 ℃, then is charged to 100% of SOC, and is converted into a constant volume; the aluminum plastic film soft package battery core formed by packaging with the soft package aluminum plastic film is sealed after primary liquid injection, the battery core is stood in a normal temperature environment of 25 +/-5 ℃, then stood in a high temperature environment of 50 +/-5 ℃, the battery core is pre-charged to 50% of SOC, then is aged in a high temperature environment of 50 +/-5 ℃, secondary liquid injection is performed after the aging is completed, electrolyte of the secondary liquid injection is uniformly mixed with a flame retardant additive, a gel monomer and a gel initiator, standing is performed for 24 hours in a normal temperature environment of 25 +/-5 ℃ after the secondary liquid injection is completed, the battery core is charged to 100% of SOC, then is stood in a normal temperature environment of 25 +/-5 ℃, is aged in a high temperature environment of 50 +/-5 ℃, is rolled for degassing, and is formed into a constant volume to obtain the target battery core.
7. The preparation method of the energy-storing safe gel lithium ion battery according to claim 6, wherein during the second injection, the electrolyte is mixed with the flame retardant additive in an amount of 3-8% by volume of the total injection amount; the flame retardant additive is ethoxy cyclotriphosphazene, and the addition amount is 5% of the total injection amount by volume ratio; the gel monomer is pentaerythritol acrylate, and the addition amount is 10 percent of the total liquid injection amount; the gel initiator is azodiisobutyronitrile, and the addition amount of the gel initiator is 0.1-1.0% of the total mass of the injection amount.
8. An energy-storing safety gel lithium ion battery, which is prepared by the preparation method of the energy-storing safety gel lithium ion battery as claimed in any one of claims 1 to 7.
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Denomination of invention: Safe gel lithium ion battery for energy storage and its preparation method Effective date of registration: 20230410 Granted publication date: 20221108 Pledgee: Zheshang Bank Co.,Ltd. Chengdu Branch Pledgor: CHENGDU MOLO ELECTRIC Co.,Ltd. Registration number: Y2023980037615 |