CN109037684B - Internal oxygen self-absorption safety lithium battery - Google Patents
Internal oxygen self-absorption safety lithium battery Download PDFInfo
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- CN109037684B CN109037684B CN201810712193.1A CN201810712193A CN109037684B CN 109037684 B CN109037684 B CN 109037684B CN 201810712193 A CN201810712193 A CN 201810712193A CN 109037684 B CN109037684 B CN 109037684B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
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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
- 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 provides an internal oxygen self-absorption safe lithium battery, which comprises a positive plate and a negative plate; the positive plate is prepared from the following raw materials in parts by weight: 90-97 parts of positive electrode active material, 0.5-4 parts of positive electrode conductive agent, 0.5-3 parts of positive electrode binder and 15-70 parts of positive electrode solvent; the positive plate also comprises an oxygen absorption additive, and the addition amount of the oxygen absorption additive is 0.01-10% of the total amount of the positive active material, the positive conductive agent and the positive binder. According to the internal oxygen self-absorption safe lithium battery, the oxygen absorption additive is uniformly mixed in the anode material, when the anode active material is decomposed at high temperature and releases oxygen, ambient oxygen can be rapidly captured, the internal oxygen concentration of the lithium battery in thermal runaway is reduced, the lithium battery cannot meet the ignition condition, and the lithium battery is prevented from being ignited in thermal runaway.
Description
Technical Field
The invention belongs to the field of lithium batteries, and particularly relates to an internal oxygen self-absorption safety lithium battery.
Background
The new energy automobile market is rapidly developed, and a large number of lithium batteries are applied. With the popularization of new energy automobiles, people put forward higher endurance mileage requirements on new energy automobiles. In order to meet the high endurance requirement, the energy density of the battery needs to be increased. The main technical route at present is to use high nickel and high voltage anode materials, silicon cathode materials and the like, and the high gram capacity of the anode materials is improved, and the problem brought by the improvement is that the thermal stability is reduced. There is a problem that the safety of the high energy density battery is lowered.
The verification shows that the thermal runaway ignition of the lithium battery is generally that the negative electrode thermal runaway releases heat at 100-200 ℃, the heat further heats the positive electrode, when the temperature reaches the decomposition temperature of the positive electrode, the positive electrode is decomposed to release heat and release oxygen, and at the moment, the interior of the battery cell meets three conditions of ignition, namely 1, combustible materials (positive and negative electrodes, electrolyte and a diaphragm); 2. comburent (oxygen released by decomposition of the anode); 3. reaching the ignition point (the heat released by the lithium battery system due to thermal runaway). Eventually causing the cell to fire.
At present, the safety design of lithium batteries is mainly improved from the aspect of system design, and generally, positive and negative electrode materials with higher thermal stability, electrolyte with a flame-retardant function, a high-melting-point diaphragm, a ceramic coating diaphragm, negative electrode ceramic surface coating, positive electrode tab ceramic coating, a PTC additive and the like are used. The above safety measures mainly serve to prevent the occurrence of thermal runaway of the battery or reduce the amount of heat released upon the occurrence of thermal runaway, so as to prevent the battery from reaching an ignition point. However, if an external heat source continuously heats the battery core, the lithium battery can finally trigger thermal runaway fire.
Disclosure of Invention
In view of this, the present invention is directed to an internal oxygen self-absorption lithium battery, which can rapidly capture ambient oxygen and reduce the internal oxygen concentration of the lithium battery when thermal runaway occurs.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an internal oxygen self-absorption safe lithium battery comprises a positive plate and a negative plate;
the positive plate is prepared from the following raw materials in parts by weight:
90-97 parts of positive electrode active material,
0.5 to 4 portions of positive electrode conductive agent,
0.5 to 3 parts of positive electrode binder,
15-70 parts of a positive electrode solvent;
the positive plate also comprises an oxygen absorption additive, and the addition amount of the oxygen absorption additive is 0.01-10wt% of the total amount of the positive active material, the positive conductive agent and the positive binder;
the oxygen absorption additive is one of aluminosilicate, activated carbon, carbon black or molecular sieve.
Further, the pore diameter of the oxygen absorption additive is 0.2-10 nm; the size of the oxygen absorbing additive is 10-100 um.
Further, the positive electrode can be usedThe material is lithium transition metal composite oxide; the lithium transition metal composite oxide is LiMxOy or LiMxPO4Wherein M is one or a combination of several transition metals, 0<x≤3，0<y is less than or equal to 4; the lithium transition metal composite oxide is LiMn2O4、LiNiO2、LiCoO2、LiNi0.5Co0.2Mn0.3O2、LiFePO4Or LiVPO4At least one of (1).
Further, the positive electrode conductive agent is one or a combination of more of carbon black, carbon nanotubes, graphene or conductive graphite; the positive electrode binder is polyvinylidene fluoride (PVDF); the anode solvent is N-methyl pyrrolidone (NMP).
Further, the negative plate is prepared from the following raw materials in parts by weight:
90-97 parts of a negative electrode active material,
0.5 to 2.5 portions of negative electrode conductive agent,
1.0 to 5 portions of negative pole adhesive,
80-140 parts of a negative electrode solvent.
Further, the negative active material is at least one of lithium alloy, carbon or silicon; the negative electrode conductive agent is at least one of carbon black, carbon nano tubes, graphene or conductive graphite; the negative binder is a combination of CMC and SBR; the cathode solvent is deionized water.
The carbon includes but is not limited to at least one of petroleum coke, activated carbon, graphite, carbon fiber, and carbon nanotube.
Furthermore, the lithium battery also comprises a membrane structure, wherein the membrane structure is a microporous membrane taking one of polyolefin, polypropylene or PET as a substrate and ceramic or boehmite as a coating; the thickness of the membrane structure is 6-30um, the porosity is 25-65%, and the air permeability is 100-1000 sec/100 cc.
Further, the lithium battery also comprises electrolyte, wherein the electrolyte is prepared from the following raw materials in parts by weight:
75-90 parts of electrolyte solvent,
8-20 parts of lithium salt of the electrolyte,
0.2-10 parts of film forming additive.
Further, the electrolyte solvent is at least one of Ethylene Carbonate (EC), Propylene Carbonate (PC), butylene carbonate, alpha-butyrolactone, alpha-valerolactone, dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC), diethoxyethane or 1, 3-dioxolane; the lithium salt of the electrolyte is LiPF6、LiBF4、LiClO4、LiBOB、LiN(CF3SO2)2、Li(CF3SO2)3At least one of; the film forming additive is at least one of vinylene sulfate (VC) or Propylene Sulfite (PS).
Further, the positive metal current collector of the positive plate is an aluminum foil; and the negative metal current collector of the negative plate is a copper foil.
The preparation method of the positive plate comprises the following steps:
(1) dissolving the positive electrode binder in the first part of the positive electrode solvent, and uniformly stirring until the positive electrode binder is completely dissolved to prepare a positive electrode glue solution;
(2) uniformly stirring the second part of the positive electrode solvent, the positive electrode conductive agent and the oxygen absorption additive;
(3) adding 50% of the prepared positive glue solution into the solution and uniformly stirring the solution;
(4) adding the positive active material and stirring uniformly;
(5) adding the rest 50% of the anode glue solution and stirring uniformly to prepare anode slurry.
(6) Coating, baking, rolling, punching and welding the positive slurry to obtain the anode material;
the sum of the first part of the cathode solvent and the second part of the cathode solvent is the total adding amount of the cathode solvent.
The preparation method of the negative plate comprises the following steps:
(1) dissolving the negative electrode binder in the first part of negative electrode solvent, and uniformly stirring until the negative electrode binder is completely dissolved to prepare a negative electrode glue solution;
(2) uniformly stirring the second part of the negative electrode solvent, the negative electrode conductive agent and the negative electrode glue solution to prepare negative electrode slurry;
(3) coating, baking, rolling, punching and welding the cathode slurry to obtain the cathode slurry;
the sum of the first part of the negative electrode solvent and the second part of the negative electrode solvent is the total adding amount of the negative electrode solvent.
Manufacturing a battery: and (3) preparing the prepared positive plate, the prepared negative plate and the diaphragm into a battery cell in a Z-shaped laminated mode, packaging the battery cell in an aluminum-plastic packaging bag, and baking the battery cell for 15 hours at 85 ℃ in vacuum. Injecting liquid and vacuum sealing. And standing the battery after liquid injection for 24 hours at normal temperature, and then pre-charging the battery at high temperature, aging the battery at high temperature for 48 hours, Degas, aging the battery at normal temperature for 14 days, grading the battery, and selecting the battery.
The oxygen absorption additive is added into the positive electrode of the lithium battery, and when the positive electrode is decomposed at high temperature to release oxygen, the oxygen absorption additive mixed into the positive electrode can be rapidly absorbed. The condition of the second comburant in the firing condition can not be met, at the moment, the lithium battery can generate thermal runaway heat release, but the lithium battery cannot fire due to insufficient oxygen, and the heat released by pure thermal runaway is far lower than the harm of thermal runaway firing. The oxygen absorbing additive is added in the anode homogenizing stage, and can absorb oxygen in air to reach saturation in the coating, rolling, baking and assembling stages. When the battery cell is assembled and the Degas procedure is carried out, the oxygen absorbed by the oxygen absorption additive can be removed again, and is driven into the lithium battery air bag and then discharged. At the moment, the oxygen absorption additive has a good oxygen absorption function again to protect the lithium battery, and timely absorbs oxygen released by the anode active material when thermal runaway occurs, so that the lithium battery is prevented from being ignited.
The oxygen absorbing additive has a plurality of pore channels with uniform pore diameters and regularly arranged holes in the structure, and has adsorption capacity. Materials of different pore sizes, which are targeted to adsorb molecules with a kinetic diameter of the molecules smaller than the pore size. Has stronger polarity and can adsorb molecules containing polar groups.
The materials can be contacted in production, life and scientific research, wherein most of the materials have a plurality of pores inside except a few compact materials such as steel, glass and the like, and the pores have different laws in different disciplines and represent different meanings.
In the study of porous materials, pores refer to both open and closed pores in the material. The cavities and ducts which are in communication with the outside are called open holes, and the cavities and ducts which are not in communication with the outside are called closed holes. Concepts associated therewith are: pore size, pore volume, pore distribution, pore volume, etc., which may occupy a volume greater than the material composition itself, and which may vary in morphology and diameter. The different sizes, distributions and various geometries of the throat of these orifices allow the physical properties of the materials to be varied and thus have different uses.
The more developed pores and more complex pore morphology lead to a larger specific surface area inside the material. Taking activated carbon as an example, the specific surface area of the bamboo activated carbon prepared by KOH activation can reach 2752 m to the maximum2The specific surface area contained by a gram of activated carbon, i.e. 1 gram, can almost reach the area of a standard football pitch.
Due to the presence of intermolecular attractive forces (primarily van der waals forces), gas molecules passing through pores in the material are attracted, i.e., adsorbed, by molecules at the surface of the pores within the material. When the specific surface area of the material is larger, the contact area of the gas passing through the pores of the material with the material is larger, and the gas molecules can be contained more. Moreover, when the pore form is complex, especially when the diameter of the gas molecule is slightly smaller than the pore diameter of the material, the gas molecule is very difficult to run out after encountering the material molecule on the surface of the pore, i.e. is not easy to be desorbed. In this case, the more developed the pore structure and the more complicated the pore form, and particularly, the larger the proportion of micropores, the larger the specific surface area of the material, and therefore the larger the amount of gas adsorbed per unit mass of the material, and the stronger the adsorption function of the material to the gas.
Compared with the prior art, the internal oxygen self-absorption safe lithium battery has the following advantages:
(1) according to the internal oxygen self-absorption safe lithium battery, the oxygen absorption additive is uniformly mixed in the anode material, when the anode active material is decomposed at high temperature and releases oxygen, ambient oxygen can be rapidly captured, the internal oxygen concentration of the lithium battery in thermal runaway is reduced, the lithium battery cannot meet the ignition condition, and the lithium battery is prevented from being ignited in thermal runaway.
(2) The oxygen absorption additive provided by the invention simultaneously has molecules with adsorption kinetic diameters smaller than the pore size of the additive, such as water absorption, and the material can adsorb water in the battery cell to prolong the cycle life of the battery cell.
Drawings
FIG. 1 is a thermal runaway safety test graph of example 1 of the present invention;
FIG. 2 is a thermal runaway safety test graph of example 2 of the present invention;
FIG. 3 is a graph of a thermal runaway safety test for comparative example 1 of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
Example 1
An internal oxygen self-absorption safe lithium battery comprises a positive plate and a negative plate; the positive plate is prepared from the following raw materials in parts by weight: LiNi0.5Co0.2Mn0.3O294 kg, 3 kg of carbon black, 2kg of PVDF, 70 kg of NMP and 2kg of activated carbon; the aperture range of the active carbon is 0.3-0.6 nm; the size of the oxygen absorbing additive is 10-100 um;
the negative plate is prepared from the following raw materials in parts by weight: 50kg of graphite, 0.80kg of CMC, 1.0kg of SBR, 0.7kg of carbon black and 60kg of deionized water.
The lithium battery also comprises a membrane structure, wherein the membrane structure is a microporous membrane with the thickness of a polyolefin substrate of 12um and the thickness of an aluminum oxide coating of 4 um.
The lithium battery also comprises electrolyte, wherein EC, PC and EMC are mixed according to the volume ratio of 35:5:60, and LiPF is added according to the lithium salt concentration of 1.0M6VC accounting for 1 percent of the mass fraction of the electrolyte and PS accounting for 1 percent of the mass fraction of the electrolyte are respectively added and fully stirred to prepare the electrolyte.
The positive metal current collector of the positive plate is an aluminum foil; and the negative metal current collector of the negative plate is a copper foil.
Manufacturing the lithium ion battery: and (3) preparing the prepared positive plate, the prepared negative plate and the diaphragm into a battery cell in a Z-shaped laminated mode, packaging the battery cell in an aluminum-plastic packaging bag, and baking the battery cell for 15 hours at 85 ℃ in vacuum. Injecting liquid and vacuum sealing. And standing the battery after liquid injection for 24 hours at normal temperature, and then pre-charging the battery at high temperature, aging the battery at high temperature for 48 hours, Degas, aging the battery at normal temperature for 14 days, grading the battery, and selecting the battery.
Example 2
An internal oxygen self-absorption safe lithium battery comprises a positive plate and a negative plate; the positive plate is prepared from the following raw materials in parts by weight: LiNi0.5Co0.2Mn0.3O294 kg, 3 kg of carbon black, 2kg of PVDF, 70 kg of NMP and 4kg of activated carbon; the aperture of the active carbon is 0.3-0.6 nm; the size of the oxygen absorbing additive is 10-100 um;
the negative plate is prepared from the following raw materials in parts by weight: 50kg of graphite, 0.80kg of CMC, 1.0kg of SBR, 0.7kg of carbon black and 60kg of deionized water.
The lithium battery also comprises a membrane structure, wherein the membrane structure is a microporous membrane with the thickness of a polyolefin substrate of 12um and the thickness of an aluminum oxide coating of 4 um.
The lithium battery also comprises electrolyte, wherein EC, PC and EMC are mixed according to the volume ratio of 35:5:60, and LiPF is added according to the lithium salt concentration of 1.0M6VC accounting for 1 percent of the mass fraction of the electrolyte and PS accounting for 1 percent of the mass fraction of the electrolyte are respectively added and fully stirred to prepare the electrolyte.
The positive metal current collector of the positive plate is an aluminum foil; and the negative metal current collector of the negative plate is a copper foil.
Manufacturing the lithium ion battery: and (3) preparing the prepared positive plate, the prepared negative plate and the diaphragm into a battery cell in a Z-shaped laminated mode, packaging the battery cell in an aluminum-plastic packaging bag, and baking the battery cell for 15 hours at 85 ℃ in vacuum. Injecting liquid and vacuum sealing. And standing the battery after liquid injection for 24 hours at normal temperature, and then pre-charging the battery at high temperature, aging the battery at high temperature for 48 hours, Degas, aging the battery at normal temperature for 14 days, grading the battery, and selecting the battery.
Comparative example 1
An internal oxygen self-absorption safe lithium battery comprises a positive plate and a negative plate; the positive plate is prepared from the following raw materials in parts by weight: LiNi0.5Co0.2Mn0.3O294 kg, 3 kg of carbon black, 2kg of PVDF and 70 kg of NMP;
the negative plate is prepared from the following raw materials in parts by weight: 50kg of graphite, 0.80kg of CMC, 1.0kg of SBR, 0.7kg of carbon black and 60kg of deionized water.
The lithium battery also comprises a membrane structure, wherein the membrane structure is a microporous membrane with the thickness of a polyolefin substrate of 12um and the thickness of an aluminum oxide coating of 4 um.
The lithium battery also comprises electrolyte, wherein EC, PC and EMC are mixed according to the volume ratio of 35:5:60, and LiPF is added according to the lithium salt concentration of 1.0M6VC accounting for 1 percent of the mass fraction of the electrolyte and PS accounting for 1 percent of the mass fraction of the electrolyte are respectively added and fully stirred to prepare the electrolyte.
The positive metal current collector of the positive plate is an aluminum foil; and the negative metal current collector of the negative plate is a copper foil.
Manufacturing the lithium ion battery: and (3) preparing the prepared positive plate, the prepared negative plate and the diaphragm into a battery cell in a Z-shaped laminated mode, packaging the battery cell in an aluminum-plastic packaging bag, and baking the battery cell for 15 hours at 85 ℃ in vacuum. Injecting liquid and vacuum sealing. And standing the battery after liquid injection for 24 hours at normal temperature, and then pre-charging the battery at high temperature, aging the battery at high temperature for 48 hours, Degas, aging the battery at normal temperature for 14 days, grading the battery, and selecting the battery.
The thermal runaway safety test method comprises the following steps:
and (3) placing the 100% SOC battery on an electric hot plate for heating until the lithium battery is out of control thermally (the lithium battery is heated up by 1 ℃/S by fast self-heating). The thermal runaway safety of examples 1-2 was compared to that of comparative example 1.
As shown in figure 1, the oxygen addition amount of the anode of the lithium battery is 2kg, the temperature rise of the lithium battery in the whole heating process is stable, when the lithium battery is out of control thermally, the voltage is rapidly reduced from 4.1V to 0V, the temperature of the battery body is continuously increased to 550 ℃ and begins to be reduced, and fire does not occur.
As shown in figure 2, the oxygen addition amount of the anode of the lithium battery is 4kg, the temperature rise of the whole heating process of the lithium battery is stable, when the lithium battery is out of control due to heat, the voltage is rapidly reduced to 0V from 4.1V, the temperature of the follow-up battery body is continuously increased to 400 ℃ and then is reduced, and fire does not occur.
As shown in fig. 3, the oxygen addition amount of the positive electrode of the lithium battery is 0kg, and as shown in the figure, thermal runaway occurs when the temperature of the lithium battery rises to approximately 200 ℃. The voltage is rapidly reduced from 4.1V to 0V, and the temperature of the lithium battery is rapidly increased from 200 ℃ to about 800 ℃ to cause fire.
Experiments prove that the oxygen absorption additive is added into the lithium battery anode, so that the temperature of the battery core after thermal runaway can be effectively reduced, and the heat release of the redox reaction in which oxygen participates is reduced. The lithium battery can avoid the thermal runaway fire.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an inside oxygen self absorption safety lithium cell which characterized in that: the lithium battery comprises a positive plate and a negative plate;
the positive plate is prepared from the following raw materials in parts by weight:
90-97 parts of positive electrode active material,
0.5 to 4 portions of positive electrode conductive agent,
0.5 to 3 parts of positive electrode binder,
15-70 parts of a positive electrode solvent;
the positive plate also comprises an oxygen absorption additive, and the addition amount of the oxygen absorption additive is 0.01-10wt% of the total amount of the positive active material, the positive conductive agent and the positive binder;
the oxygen absorption additive is one of aluminosilicate, activated carbon, carbon black or molecular sieve;
the aperture of the oxygen absorption additive is 0.2-0.6 nm; the size of the oxygen absorbing additive is 10-100 um;
the preparation method of the positive plate comprises the following steps:
(1) dissolving the positive electrode binder in the first part of the positive electrode solvent, and uniformly stirring until the positive electrode binder is completely dissolved to prepare a positive electrode glue solution;
(2) uniformly stirring the second part of the positive electrode solvent, the positive electrode conductive agent and the oxygen absorption additive;
(3) adding 50% of the prepared positive glue solution into the solution and uniformly stirring the solution;
(4) adding the positive active material and stirring uniformly;
(5) adding the rest 50% of the positive pole glue solution and uniformly stirring to prepare positive pole slurry;
(6) coating, baking, rolling, punching and welding the positive slurry to obtain the anode material;
the sum of the first part of the cathode solvent and the second part of the cathode solvent is the total adding amount of the cathode solvent.
2. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the positive active material is a lithium transition metal composite oxide; the lithium transition metal composite oxide is LiMxOy or LiMxPO4Wherein M is one or a combination of several transition metals, 0<x≤3，0<y≤4。
3. The internal oxygen self-absorption safety lithium battery of claim 2 characterized in thatThe method comprises the following steps: the lithium transition metal composite oxide is LiMn2O4、LiNiO2、LiCoO2、LiNi0.5Co0.2Mn0.3O2、LiFePO4Or LiVPO4At least one of (1).
4. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the positive conductive agent is one or a combination of more of carbon black, carbon nano tubes, graphene or conductive graphite; the positive binder is PVDF; the positive electrode solvent is NMP.
5. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the negative plate is prepared from the following raw materials in parts by weight:
90-97 parts of a negative electrode active material,
0.5 to 2.5 portions of negative electrode conductive agent,
1.0 to 5 portions of negative pole adhesive,
80-140 parts of a negative electrode solvent.
6. The internal oxygen self-absorption safety lithium battery of claim 5, wherein: the negative active material is at least one of lithium alloy, carbon or silicon; the negative electrode conductive agent is at least one of carbon black, carbon nano tubes, graphene or conductive graphite; the negative binder is a combination of CMC and SBR; the cathode solvent is deionized water.
7. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the lithium battery also comprises a membrane structure, wherein the membrane structure is a microporous membrane taking one of polyolefin, polypropylene or PET as a substrate and ceramic or boehmite as a coating; the thickness of the membrane structure is 6-30um, the porosity is 25-65%, and the air permeability is 100-1000 sec/100 cc.
8. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the lithium battery also comprises electrolyte, wherein the electrolyte is prepared from the following raw materials in parts by weight:
75-90 parts of electrolyte solvent,
8-20 parts of lithium salt of the electrolyte,
0.2-10 parts of film forming additive.
9. The internal oxygen self-absorption safety lithium battery of claim 8, wherein: the electrolyte solvent is at least one of ethylene carbonate, propylene carbonate, butylene carbonate, alpha-butyrolactone, alpha-valerolactone, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, diethoxyethane or 1, 3-dioxolane; the lithium salt of the electrolyte is LiPF6、LiBF4、LiClO4、LiBOB、LiN(CF3SO2)2、Li(CF3SO2)3At least one of; the film forming additive is at least one of vinylene sulfate or propylene sulfite.
10. The internal oxygen self-absorption safety lithium battery of claim 1, wherein: the positive metal current collector of the positive plate is an aluminum foil; and the negative metal current collector of the negative plate is a copper foil.
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| CN113054190A (en) * | 2019-12-26 | 2021-06-29 | 北京宝沃汽车股份有限公司 | Method for reducing gas generation of battery |
| CN111342116A (en) * | 2020-03-17 | 2020-06-26 | 天津市捷威动力工业有限公司 | Safety lithium ion battery |
| CN113451664B (en) * | 2020-03-24 | 2023-01-24 | 东营市海科新源化工有限责任公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and lithium ion battery |
| CN111446450A (en) * | 2020-03-31 | 2020-07-24 | 珠海冠宇电池股份有限公司 | Functional material, positive plate containing functional material and lithium ion battery |
| CN114583385B (en) * | 2022-03-02 | 2024-03-15 | 上海兰钧新能源科技有限公司 | Lithium battery composite safety diaphragm, lithium battery cell and corresponding preparation method |
| CN114464908B (en) * | 2022-04-13 | 2022-08-12 | 四川新能源汽车创新中心有限公司 | Three-dimensional porous coating for lithium ion battery and preparation and application thereof |
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| US20110143204A1 (en) * | 2010-10-04 | 2011-06-16 | Ford Global Technologies, Llc | Lithium-Containing Electrode Material for Electrochemical Cell Systems |
| WO2013052494A1 (en) * | 2011-10-03 | 2013-04-11 | A123 Systems, Inc. | Cathode materials including an oxygen-gettering compound and an ion-storage compound |
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| CN207489981U (en) * | 2017-09-29 | 2018-06-12 | 清华大学 | Lithium ion battery separator and with its lithium ion battery |
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| JPH07220698A (en) * | 1994-02-07 | 1995-08-18 | Tdk Corp | Layered lithium secondary battery |
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| CN1518146A (en) * | 2003-01-20 | 2004-08-04 | ������������ʽ���� | Nonaqueous electrolyte battery |
| US20110143204A1 (en) * | 2010-10-04 | 2011-06-16 | Ford Global Technologies, Llc | Lithium-Containing Electrode Material for Electrochemical Cell Systems |
| WO2013052494A1 (en) * | 2011-10-03 | 2013-04-11 | A123 Systems, Inc. | Cathode materials including an oxygen-gettering compound and an ion-storage compound |
| CN103050705A (en) * | 2013-01-06 | 2013-04-17 | 天津市捷威动力工业有限公司 | Lithium titanate coated cathode and lithium ion battery using cathode |
| CN207489981U (en) * | 2017-09-29 | 2018-06-12 | 清华大学 | Lithium ion battery separator and with its lithium ion battery |
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