CN115775925A - Lithium ion battery preparation method and lithium ion battery - Google Patents

Lithium ion battery preparation method and lithium ion battery Download PDF

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Publication number
CN115775925A
CN115775925A CN202111052547.2A CN202111052547A CN115775925A CN 115775925 A CN115775925 A CN 115775925A CN 202111052547 A CN202111052547 A CN 202111052547A CN 115775925 A CN115775925 A CN 115775925A
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China
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pole piece
lithium ion
ion battery
preparing
solid electrolyte
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Chinese (zh)
Inventor
江泰志
张立
吴可
刘正耀
于冉
孙召琴
王中杰
杨爱晟
郭晓峻
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State Grid Electric Power Research Institute Of Sepc
Rongsheng Mengguli New Energy Technology Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Electric Power Research Institute Of Sepc
Rongsheng Mengguli New Energy Technology Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN202111052547.2A priority Critical patent/CN115775925A/en
Publication of CN115775925A publication Critical patent/CN115775925A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a lithium ion battery and a preparation method thereof. The method comprises the following steps: preparing a solution with a certain concentration and comprising a binder, a dispersant and a plasticizer; adding inorganic ceramic particle powder materials into the solution step by step, and fully stirring, dispersing and uniformly mixing to obtain slurry; coating the slurry on the surface of the positive pole piece and/or the negative pole piece, and after the slurry is fully dried, forming an inorganic diaphragm on the surface of the positive pole piece and/or the negative pole piece; fully dissolving a solid electrolyte into an organic solvent according to a certain concentration to obtain a solid electrolyte organic solution; filling solid electrolyte organic solution on the surfaces and the inner pores of the positive plate and the negative plate, and drying after full imbibition to obtain a solid electrolyte filled composite positive plate and negative plate; preparing the positive pole piece and the negative pole piece into a battery cell in a lamination or winding manner; and (5) packaging and injecting the battery cell to prepare the lithium ion battery. The thermal runaway risk of the battery is effectively reduced, and the safety of the battery is improved.

Description

Lithium ion battery preparation method and lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery and the lithium ion battery.
Background
Lithium ion secondary batteries have been now applied in large scale to digital consumer electronics, new energy vehicles, energy storage power stations, unmanned aerial vehicles and other market segments due to their higher energy storage density. However, in recent years, safety accidents caused by lithium ion batteries have increased, and the main reason for the accidents is that the internal structure of the lithium ion battery is changed destructively by itself or by the influence of external environment, and thermal runaway of the battery or the battery system is caused.
The lithium ion battery is mainly composed of a positive electrode, a negative electrode, a diaphragm and electrolyte. The diaphragm is used as an insulator and is arranged between the positive electrode and the negative electrode, and the main function is to prevent the internal short circuit caused by the direct contact of the positive electrode and the negative electrode, so that the performance of the diaphragm is closely related to the safety of the battery. The high-safety diaphragm should have good mechanical properties (including tensile and puncture strength), high chemical and electrochemical stability, high thermal stability, good thickness uniformity, etc. In addition, since the lithium ion battery uses carbonate organic electrolyte, the separator needs to have good wettability of organic electrolyte to increase the transmission rate of lithium ions and reduce the impedance of the battery.
At present, a lithium ion battery adopts a diaphragm mainly made of polyolefin organic materials, and safety accidents such as fire and explosion caused by thermal runaway are easily caused by thermal contraction and increase of the short circuit area in the battery under the conditions of overheating, overcharging, internal (external) short circuit, mechanical abuse and the like of the lithium ion battery.
The other major electrolyte of the battery consists of lithium salt and organic solvent, and plays a role of conducting lithium ions in the battery. The electrolyte is required to have high ionic conductivity (electrical conductivity)>10 -3 S/cm), chemical stability, thermal stability, electrochemical window, environmental friendliness, and the like. Among them, high ionic conductivity requires an electrolyte having a high dielectric constant and a low viscosity, and commonly used organic electrolyte solvents include cyclic carbonates (PC, EC) and chain carbonates (DEC, DMC, EMC), etc. Generally, the total weight of the electrolyte accounts for about 20% of the weight of the battery, the organic electrolyte can be violently combusted in the thermal runaway process of the battery and even cause the explosion of the battery, and the electrolyte is an important heat generation source in the combustion process of the battery, so that the uncontrollable accident and the loss of personnel and property are increased.
Disclosure of Invention
The invention aims to provide a lithium ion battery and a preparation method thereof, and solves the problem that thermal runaway is easy to occur after the internal structure of the conventional lithium ion battery is damaged.
In order to achieve the above object, the present invention provides a method for preparing a lithium ion battery, comprising:
preparing a solution with a certain concentration and comprising a binder, a dispersant and a plasticizer;
adding inorganic ceramic particle powder materials into the solution step by step, and fully stirring, dispersing and uniformly mixing to obtain slurry;
providing a positive pole piece and a negative pole piece, wherein the positive pole piece comprises a positive current collector and a positive active substance layer formed on the surface of the positive current collector, and the negative pole piece comprises a negative current collector and a negative active substance layer formed on the surface of the negative current collector;
coating the slurry on the surface of the positive pole piece and/or the negative pole piece, and after the slurry is fully dried, forming an inorganic diaphragm on the surface of the positive pole piece and/or the negative pole piece;
fully dissolving a solid electrolyte into an organic solvent according to a certain concentration to obtain a solid electrolyte organic solution;
filling the solid electrolyte organic solution on the surfaces and the inner pores of the positive plate and the negative plate, and drying after full imbibition to obtain a positive plate and a negative plate which are compounded by filling the solid electrolyte;
preparing a battery cell by filling and compounding a positive pole piece and a negative pole piece with a solid electrolyte in a lamination or winding manner, wherein the inorganic diaphragm is used as a lithium ion battery diaphragm;
and packaging and injecting the battery core to prepare the lithium ion battery.
The invention also provides a lithium ion battery which is prepared by the preparation method of the lithium ion battery.
The invention has the beneficial effects that:
compared with the organic diaphragm of the traditional lithium ion battery, the electrode-supported inorganic diaphragm has excellent thermal stability, can inhibit the diaphragm deformation when the battery is overheated, controls the thermal shrinkage of the diaphragm when the thermal runaway, further prevents the internal short circuit of the battery, inhibits the release of the energy of the positive and negative electrodes in the battery, prepares the positive electrode plate and the negative electrode plate which are filled and compounded by the solid electrolyte by adopting a mode of pre-filling the composite electrode plate by the solid electrolyte, and can reduce the adding amount of the traditional organic electrolyte in the battery by adopting the composite electrode plate, thereby reducing important heat production sources in the thermal runaway process of the battery and further reducing the risk of violent combustion and even explosion of the battery.
The system of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 shows a step diagram of a method for producing a lithium ion battery according to the invention.
Fig. 2 shows a schematic diagram of a pole piece in which an inorganic separator is combined with a solid electrolyte in a method for manufacturing a lithium ion battery according to example 1 of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a process diagram of a method for producing a lithium ion battery according to the invention.
As shown in fig. 1, a method for preparing a lithium ion battery includes:
step S101: preparing a solution with a certain concentration and comprising a binder, a dispersant and a plasticizer;
specifically, the binder is one or a combination of more of polyvinyl alcohol, polyethylene, polypropylene, polyvinylidene fluoride, polyimide, polyethylene oxide, polyacrylonitrile, carboxymethyl cellulose, starch, dextrin, polyvinylpyrrolidone and the like;
the dispersant is one or more of sodium hexametaphosphate, sodium pyrophosphate, sodium polyacrylate, polyacrylic acid, polyvinyl alcohol, ethylene glycol, n-propanol, phosphate, ethoxy compound, herring oil, polymethacrylic acid and ammonium polymethacrylate;
the plasticizer is one or more of polyethylene glycol, dibutyl phthalate, dioctyl phthalate, epoxidized soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate and chlorinated paraffin.
Step S102: adding inorganic ceramic particle powder materials into the solution step by step, and fully stirring, dispersing and uniformly mixing to obtain slurry;
specifically, the inorganic ceramic particle powder material is alumina (Al) 2 O 3 ) Zirconium oxide (ZrO) 2 ) Silicon dioxide (SiO) 2 ) Titanium dioxide (TiO) 2 ) Magnesium oxide (MgO), zinc oxide (ZnO), calcium oxide (CaO) calcium carbonate (CaCO) 3 ) And the like, or combinations thereof. The inorganic ceramic particle powder material is nano or micron particles, and preferably, the particle size range of the inorganic ceramic particle powder material is 10nm-10 mu m.
In the prepared slurry, the dispersing agent reduces the interfacial tension between the particles and the liquid through a mechanism such as steric hindrance or electrostatic steric hindrance, so that the degree of particle agglomeration and the strength of the agglomeration are controlled, the ceramic particles can be in a stable discrete state in the slurry, and the dispersing agent plays an important role in the stability of the slurry and the uniformity of the coated inorganic diaphragm layer. The adhesive can improve the acting force between the ceramic particles of the inorganic diaphragm layer and the acting force between the ceramic particles and the coating substrate, so that the inorganic diaphragm layer has certain mechanical strength. The plasticizer is mainly used for increasing the flexibility of the inorganic membrane layer and improving the processability of the inorganic membrane layer.
Step S103: providing a positive pole piece and a negative pole piece, wherein the positive pole piece comprises a positive current collector and a positive active substance layer formed on the surface of the positive current collector, and the negative pole piece comprises a negative current collector and a negative active substance layer formed on the surface of the negative current collector;
specifically, the electrode sheet includes a current collector and an electrode active material layer formed on the surface of the current collector, if the electrode sheet is a positive electrode sheet, the corresponding current collector may be an aluminum foil, and the corresponding electrode active material is a positive electrode active material, if the electrode sheet is a negative electrode sheet, the corresponding current collector may be a copper foil, and the corresponding electrode active material is a negative electrode active material.
Step S104: and coating the slurry on the surface of the positive pole piece and/or the negative pole piece, and after the slurry is fully dried, forming an inorganic diaphragm on the surface of the positive pole piece and/or the negative pole piece to obtain the electrode support type inorganic diaphragm.
Preferably, the inorganic separator is composed of the following materials in parts by weight: 70-95 parts of inorganic ceramic particle powder, 5-20 parts of binder, 0-5 parts of dispersant and 0-5 parts of plasticizer.
By adopting the electrode support type inorganic diaphragm, the diaphragm deformation of the battery during overheating is inhibited by utilizing the excellent thermal stability of the inorganic diaphragm, and the thermal shrinkage of the diaphragm during thermal runaway is controlled, so that the internal short circuit of the battery is prevented, the release of the energy of the anode and the cathode in the battery is inhibited, and the thermal runaway risk of the battery is reduced.
Step S105: fully dissolving a solid electrolyte into an organic solvent according to a certain concentration to obtain a solid electrolyte organic solution;
specifically, the solid electrolyte includes one or a combination of several of an inorganic oxide lithium ion conductor, an inorganic sulfide lithium ion conductor, a polymer, a lithium salt, and the like. The polymer is polyethylene oxide (PEO), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polypropylene oxide (PPO), polyvinyl chloride (PVC), poly (vinylidene fluoride-hexafluoropropylene) (P (VDF-HFP)), and the like, and one or a combination of more of the modified polymers, and the lithium salt comprises one or a combination of more of lithium perchlorate (LiClO 4), lithium tetrafluoroborate (LiBF 4), lithium hexafluoroarsenate (LiAsF 6), lithium hexafluorophosphate (LiPF 6), lithium bis (oxalato) borate (LiBOB), lithium bis (difluorosulfonimide) (LiFSI) and lithium bis (trifluoromethylsulfonyl) imide (LiTFSI).
Step S106: filling the solid electrolyte organic solution on the surfaces and the inner pores of the positive plate and the negative plate, and drying after full imbibition to obtain a positive plate and a negative plate which are compounded by filling the solid electrolyte; the method for filling the solid electrolyte organic solution on the surface of the pole piece can be soaking, blade coating or spraying.
By adopting the mode that the composite electrode plate is filled with the solid electrolyte in advance, the proportion of the traditional organic electrolyte in the battery is reduced, an important heat production source in the thermal runaway process of the battery is controlled, and the risk of violent combustion and even explosion of the battery can be further reduced.
Step S107: preparing a battery cell by filling and compounding a positive pole piece and a negative pole piece with a solid electrolyte in a lamination or winding manner, wherein an inorganic diaphragm is used as a lithium ion battery diaphragm;
step S108: and (4) encapsulating the battery cell with liquid to prepare the lithium ion battery.
The present invention will be further illustrated by the following specific examples.
Example 1
A method of making a lithium ion battery, comprising:
(1) Coating a negative electrode active material layer consisting of 96wt% graphite, 2wt% PVDF (polyvinylidene fluoride), 2wt% SP (conductive carbon black) on the surface of the copper foil, and drying and rolling to obtain a negative electrode sheet;
(2) Preparing an aqueous solution containing 3wt% of polyvinyl alcohol, 1.5wt% of sodium polyacrylate and 1.5wt% of polyethylene glycol;
(3) Adding silica particles with the particle size of 100nm and the particle size of 1 mu m into the prepared aqueous solution step by step for multiple times, and fully stirring, dispersing and uniformly mixing to obtain slurry; wherein the mass ratio of the 100nm silicon dioxide particles to the 1 mu m silicon dioxide particles is 3:7, adjusting the solid content of the solution to 70% to obtain slurry;
(4) Coating the slurry obtained in the step (3) on the surface of the negative pole piece obtained in the step (1), and fully drying to obtain a negative pole piece with an inorganic diaphragm;
(5) Coating a positive active material layer consisting of 96wt% of lithium iron phosphate, 2wt% PVDF and 2wt% SP on the surface of the aluminum foil, and drying and rolling to obtain a positive pole piece;
(6) Preparing an acetonitrile solution containing PEO and LiTFSI, wherein the molar ratio of EO to Li is 9:1, PEO accounts for 10 percent of the mass of the whole solution to obtain a solid electrolyte organic solution;
(7) Completely soaking the positive pole piece and the negative pole piece in the steps 4 and 5 in the solid electrolyte organic solution obtained in the step (6), taking out after each pole piece sufficiently absorbs liquid, and performing vacuum drying at 60 ℃ for 24 hours to obtain a solid electrolyte filled composite positive pole piece and negative pole piece; the microstructure of the negative electrode plate of the composite inorganic diaphragm and the solid electrolyte is shown in fig. 2, and the composite electrode plate structure comprises a current collector 1, electrode active particles 2 formed on the surface of the current collector, inorganic diaphragm particles 3 formed on the outer layer of the electrode active material particles 2, and a solid electrolyte membrane layer 4 which coats and fills the surfaces and pores of the electrode active material particles 2 and the inorganic diaphragm particles 3.
(8) And (3) filling the solid electrolyte obtained in the step (7) into the compounded positive pole piece and negative pole piece to prepare a battery core in a lamination or winding mode, packaging, injecting liquid (the injection amount is 2.5g/Ah and is about 50% of that of the conventional lithium iron phosphate battery), and preparing the battery.
Example 2
A method of making a lithium ion battery, comprising:
(1) Coating a positive active material layer consisting of 96wt% of lithium cobaltate, 2wt% of PVDF and 2wt% of SP on the surface of the aluminum foil, and drying and rolling to obtain a positive pole piece;
(2) Preparing an ethanol solution containing 3wt% of polyvinylpyrrolidone and 1wt% of polyethylene oxide;
(3) Adding aluminum oxide particles with the particle size of 300nm into the prepared ethanol solution step by step for multiple times, fully stirring, dispersing and uniformly mixing, and adjusting the solid content of the solution to 60% to obtain slurry;
(4) Coating the slurry obtained in the step (3) on the surface of the positive pole piece obtained in the step (1), and fully drying to obtain an inorganic diaphragm composite positive pole piece;
(5) Coating a negative electrode active material layer consisting of 96wt% of graphite, 1.5wt% of SBR, 1.5wt% of CMC and 1wt% of SP on the surface of the copper foil, and drying and rolling the negative electrode active material layer to obtain a negative electrode pole piece;
(6) Preparing an acetonitrile solution containing PEO and LiBF4, wherein the molar ratio of EO (ether oxygen) to Li (lithium ion) is 16:1, PEO accounts for 10 percent of the mass of the whole solution to obtain a solid electrolyte organic solution;
(7) And (3) coating the solid electrolyte organic solution obtained in the step (6) on the positive pole piece and the negative pole piece obtained in the steps (4) and (5) in a blade coating mode, taking out the positive pole piece and the negative pole piece after the positive pole piece and the negative pole piece fully absorb liquid, and performing vacuum drying at 60 ℃ for 24 hours to obtain the solid electrolyte filled composite positive pole piece and negative pole piece.
(8) And (4) filling the solid electrolyte obtained in the step (7) into the compounded positive pole piece and negative pole piece to prepare the battery core in a lamination or winding mode, packaging, injecting liquid (the injection amount is 1.5g/Ah and is about 50 percent of that of the conventional lithium cobalt oxide battery), and preparing the battery.
Example 3
A method of making a lithium ion battery, comprising:
(1) Coating a positive active material layer consisting of 96wt% of nickel cobalt lithium manganate, 2wt% PVDF and 2wt% SP on the surface of the aluminum foil, and drying and rolling to obtain a positive pole piece;
(2) Preparing an ethanol solution containing 3wt% of polyvinylpyrrolidone and 1wt% of polyethylene oxide;
(3) Adding aluminum oxide particles with the particle size of 300nm into the prepared ethanol solution step by step for multiple times, fully stirring, dispersing and uniformly mixing, and adjusting the solid content of the solution to 60% to obtain first slurry;
(4) Coating the first slurry obtained in the step (3) on the surface of the positive pole piece obtained in the step (1), and fully drying to obtain an inorganic diaphragm composite positive pole piece;
(5) Coating a negative electrode active material layer consisting of 76wt% graphite, 19wt% silicon oxide, 1.5wt% SBR, 1.5wt% CMC, 1wt% SP, and 1wt% CNT (carbon nanotube) on the surface of the copper foil, and drying and rolling the layer to obtain a negative electrode sheet;
(6) Preparing a solution containing 3wt% of polyvinyl alcohol, 1wt% of sodium polyacrylate and 1wt% of polyethylene glycol N-methyl pyrrolidone (NMP);
(7) Adding silica particles with the particle sizes of 100nm and 1 mu m into the prepared NMP solution step by step for many times, fully stirring, dispersing and uniformly mixing, wherein the mass ratio of the silica particles with the particle size of 100nm to the silica particles with the particle size of 1 mu m is 3:7, adjusting the solid content of the solution to 50% to obtain a second slurry;
(8) And (4) coating the second slurry obtained in the step (7) on the surface of the negative pole piece obtained in the step (5), and fully drying to obtain the inorganic diaphragm composite negative pole piece.
(9) Preparing an acetonitrile solution containing PEO and LiTFSI, wherein the molar ratio of EO to Li is 12:1, PEO accounts for 10 percent of the mass of the whole solution to obtain a solid electrolyte organic solution;
(10) And (3) completely soaking the positive pole piece and the negative pole piece of the composite inorganic diaphragm obtained in the steps (4) and (8) in the solid electrolyte organic solution obtained in the step (9), taking out the pole pieces after each pole piece sufficiently absorbs liquid, and performing vacuum drying at 60 ℃ for 24 hours to obtain the solid electrolyte filled composite positive pole piece and negative pole piece.
(11) And (3) filling the solid electrolyte obtained in the step (10) into the compounded positive pole piece and negative pole piece to prepare a battery core in a lamination or winding mode, packaging, injecting liquid (the injection amount is 2g/Ah and is about 50 percent of that of the conventional nickel-cobalt lithium manganate battery), and preparing the battery.
Example 4
The embodiment of the invention also provides a lithium ion battery, and the lithium ion battery is prepared by the preparation method of the lithium ion battery in any embodiment. The lithium ion battery has the advantages that the inorganic diaphragm and the solid electrolyte are adopted to fill the composite positive pole piece and negative pole piece, so that the electrolyte with excellent thermal stability and smaller specific gravity is provided, thermal runaway is not easy to occur after the internal structure of the battery is damaged, and high safety is realized.
Comparative example
(1) Coating a positive active material layer consisting of 96wt% of nickel cobalt lithium manganate, 2wt% PVDF and 2wt% SP on the surface of the aluminum foil, and drying and rolling to obtain a positive pole piece;
(2) Coating a negative electrode active material layer consisting of 76wt% graphite, 19wt% silicon oxide, 1.5wt% SBR, 1.5wt% CMC, 1wt% SP, 1wt% CNT (carbon nanotube) on the surface of the copper foil, and drying and rolling to obtain a negative electrode sheet;
(3) And (3) preparing a battery core by laminating the positive pole piece and the negative pole piece obtained in the steps (1) and (2) with the polypropylene microporous diaphragm, packaging, injecting liquid (the injection amount is 4 g/Ah), and preparing the 80Ah long-strip soft package battery.
A needle punch safety test was performed on any one of the 80Ah strip pouch batteries of example 4 and the battery of the comparative example, respectively. The center position of the large surface of the battery in a fully charged state was pierced at a speed of 25 + -5 mm using a steel needle having a diameter of 8mm at an ambient temperature of 20 + -5 deg.c and maintained for 1 hour, the ignition and the vigorous combustion occurred in the battery in comparative example, and the battery in example 4 did not explode and did not ignite.
In conclusion, the invention abandons the organic diaphragm of the traditional lithium ion battery and adopts an electrode supporting type inorganic diaphragm, utilizes the excellent thermal stability of the inorganic diaphragm to inhibit the diaphragm deformation when the battery is overheated, controls the thermal shrinkage of the diaphragm when the thermal runaway, further prevents the short circuit in the battery and inhibits the release of the energy of the anode and the cathode in the battery; the invention also reduces the proportion of the traditional organic electrolyte in the battery by adopting a mode of filling the composite electrode plate with the solid electrolyte in advance, controls an important heat production source in the thermal runaway process of the battery, and further reduces the risk of violent combustion and even explosion of the battery, thereby solving the problem that the thermal runaway is easy to occur after the internal structure of the existing lithium ion battery is damaged, and effectively improving the safety of the lithium ion battery.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (12)

1. A method for preparing a lithium ion battery is characterized by comprising the following steps:
preparing a solution with a certain concentration and comprising a binder, a dispersant and a plasticizer;
adding inorganic ceramic particle powder materials into the solution step by step, and fully stirring, dispersing and uniformly mixing to obtain slurry;
providing a positive pole piece and a negative pole piece, wherein the positive pole piece comprises a positive current collector and a positive active substance layer formed on the surface of the positive current collector, and the negative pole piece comprises a negative current collector and a negative active substance layer formed on the surface of the negative current collector;
coating the slurry on the surface of the positive pole piece and/or the negative pole piece, and after the slurry is fully dried, forming an inorganic diaphragm on the surface of the positive pole piece and/or the negative pole piece;
fully dissolving a solid electrolyte into an organic solvent according to a certain concentration to obtain a solid electrolyte organic solution;
filling the solid electrolyte organic solution on the surfaces and the inner pores of the positive plate and the negative plate, and drying after full imbibition to obtain a positive plate and a negative plate which are compounded by filling the solid electrolyte;
preparing a battery cell by filling and compounding a positive pole piece and a negative pole piece with a solid electrolyte in a lamination or winding manner, wherein the inorganic diaphragm is used as a lithium ion battery diaphragm;
and encapsulating the battery cell with liquid to prepare the lithium ion battery.
2. The method for preparing a lithium ion battery according to claim 1, wherein the inorganic separator is composed of 70 to 95 parts by weight of the inorganic ceramic particle powder material, 5 to 20 parts by weight of the binder, 0 to 5 parts by weight of the dispersant, and 0 to 5 parts by weight of the plasticizer.
3. The method for preparing an electrode-supporting inorganic separator according to claim 1, wherein the inorganic ceramic particle powder material is one or a combination of more of alumina, zirconia, silica, titania, magnesia, zinc oxide, calcium oxide, and calcium carbonate.
4. The method for preparing the lithium ion battery according to claim 1 or 2, wherein the inorganic ceramic particle powder material is a nano-sized or micro-sized particle having a particle size range of 10nm to 10 μm.
5. The method for preparing the lithium ion battery according to claim 1, wherein the binder is one or a combination of polyvinyl alcohol, polyethylene, polypropylene, polyvinylidene fluoride, polyimide, polyethylene oxide, polyacrylonitrile, carboxymethyl cellulose, starch, dextrin and polyvinylpyrrolidone.
6. The method of claim 1, wherein the dispersant is one or more selected from sodium hexametaphosphate, sodium pyrophosphate, sodium polyacrylate, polyacrylic acid, polyvinyl alcohol, ethylene glycol, n-propanol, phosphate, ethoxy compound, herring oil, polymethacrylic acid, and ammonium polymethacrylate.
7. The method for preparing the lithium ion battery according to claim 1, wherein the plasticizer is one or more of polyethylene glycol, dibutyl phthalate, dioctyl phthalate, epoxidized soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, and chlorinated paraffin.
8. The method of claim 1, wherein the solid electrolyte comprises one or more of an inorganic oxide lithium ion conductor, an inorganic sulfide lithium ion conductor, a polymer, and a lithium salt.
9. The method for preparing the lithium ion battery according to claim 8, wherein the polymer is one or more of polyethylene oxide, polymethyl methacrylate, polyvinylidene fluoride, polyacrylonitrile, polypropylene oxide, polyvinyl chloride, polyvinylidene fluoride-hexafluoropropylene, and modified polymers thereof.
10. The method for preparing the lithium ion battery according to claim 8, wherein the lithium salt is one or a combination of several of lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium bis (difluorosulfonimide) and lithium bis (trifluoromethylsulfonyl imide).
11. The method for preparing the lithium ion battery according to claim 1, wherein the manner of filling the solid electrolyte organic solution on the surface of the pole piece is soaking, blade coating or spraying.
12. A lithium ion battery, characterized in that the lithium ion battery is prepared by the method for preparing a lithium ion battery according to claims 1-11.
CN202111052547.2A 2021-09-08 2021-09-08 Lithium ion battery preparation method and lithium ion battery Pending CN115775925A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116314807A (en) * 2023-03-20 2023-06-23 江苏一特新材料有限责任公司 Suspending agent for lithium ion battery negative electrode slurry, and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116314807A (en) * 2023-03-20 2023-06-23 江苏一特新材料有限责任公司 Suspending agent for lithium ion battery negative electrode slurry, and preparation method and application thereof
CN116314807B (en) * 2023-03-20 2023-10-27 江苏一特新材料有限责任公司 Suspending agent for lithium ion battery negative electrode slurry, and preparation method and application thereof

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