CN113651763A - Negative electrode additive, preparation method thereof, negative electrode plate and lithium ion battery - Google Patents
Negative electrode additive, preparation method thereof, negative electrode plate and lithium ion battery Download PDFInfo
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- CN113651763A CN113651763A CN202110761214.0A CN202110761214A CN113651763A CN 113651763 A CN113651763 A CN 113651763A CN 202110761214 A CN202110761214 A CN 202110761214A CN 113651763 A CN113651763 A CN 113651763A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/56—Preparation of melamine
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
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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
- H01M10/42—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
- 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
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
Abstract
The invention discloses a negative electrode additive and a preparation method thereof, a negative electrode plate and a lithium ion battery, wherein the preparation method of the negative electrode additive comprises the following steps: s1: mixing a phosphoric acid solution and melamine powder in proportion, stirring, heating to 50-150 ℃, reacting for 1-6 h, heating to 150-300 ℃, and reacting for 1-6 h to obtain a melamine phosphate intermediate; s2: adding LiOH powder into a melamine phosphate intermediate, stirring, heating to 250-350 ℃, and reacting for 1-6 hours to obtain melamine lithium polyphosphate; the negative pole piece comprises a current collector, an active substance, a conductive agent, a binder, a thickening agent and a negative additive. The additive contains rich nitrogen and phosphorus groups, and can form a glass material which is difficult to volatilize when the battery is heated, and the glass material is attached to the surface of a negative electrode material to slow down the intensity of oxidation reaction of the negative electrode, so that the safety of the battery is improved; the lithium ion battery containing the negative pole piece has higher safety performance.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative electrode additive and a preparation method thereof, a negative electrode plate and a lithium ion battery.
Background
With the wide application in consumer electronics, power automobiles, energy storage power stations and the like, the safety performance of lithium ion batteries is more and more emphasized by people. The prevention or delay of the combustion and explosion of the battery is an important aspect for improving the safety performance of the battery. For example, chinese patent CN104466053A proposes that organic silica gel is filled in a battery case, and the organic silica gel decomposes and generates a flame retardant gas in a heated extreme environment, thereby delaying the explosion time. However, the method can only delay the failure consequences after the battery fails, and cannot prevent the failure events from happening. The Chinese patent CN112242652A adds phosphazene and its derivatives, halogenated alkyl derivatives, halogenated phosphate/phosphite and other additives into the organic electrolyte, and utilizes the characteristics of various flame retardant additives such as vapor pressure and boiling point difference to perform segmentation action in the battery failure process so as to delay battery failure. The inventors have found that the flame retardant additive does allow the electrolyte to reach a non-combustible state, but still does not prevent combustion of the lithium ion battery. This is because the negative electrode in a fully charged state has higher reducibility than the organic electrolytic solution, and can react with a weak oxidizing agent to achieve chain combustion. Chinese patent CN111916661A proposes that the surface of the positive electrode plate, the negative electrode plate or the diaphragm is coated with a flame retardant material, which can effectively avoid the problem of thermal runaway of the lithium ion battery. However, this method increases the battery manufacturing process, increases the cost, and does not allow the flame retardant material to be sufficiently in contact with the active material.
In view of this, it is necessary to provide a new method for reducing the flammability of the lithium ion battery and improving the safety of the lithium ion battery.
Disclosure of Invention
The invention aims to provide a negative electrode additive, which reduces the flammability of a lithium ion battery and improves the safety of the lithium ion battery.
In order to realize the purpose, the following technical scheme is adopted:
a negative electrode additive comprising a compound represented by the structure of formula I, formula I being as follows:
wherein the value range of n is 1-8.
The additive contains abundant N, P components, and can form glass material which is difficult to volatilize when the temperature of the battery rises, so that the additive can insulate heat and oxygen, reduce the flammability of the battery and improve the safety of the battery. However, substances with too high molecular weight can bring about the hidden troubles of viscosity increase and uneven dispersion in the slurry mixing process, so the value of n is between 1 and 8.
The additive also has more double bond oxygen in the structure, and can form hydrogen bond action with functional groups on the surface of the negative active material, especially hydroxyl functional groups, and be adsorbed on the surface of the negative active material, so that the safety of the negative material is improved.
The additive is lithiated, and lithium ions do not need to be consumed in the first charging process of the battery, so that the coulomb efficiency of the battery is not reduced. On the other hand, the additive is adsorbed on the surface of the negative active material, and lithium ions in the additive can be used as lithium ion channels, so that the resistance of lithium ions in the electrolyte to jump and be embedded into the negative active material is reduced, and the battery performance is improved.
The additive disclosed by the invention can be added when the negative electrode is mixed with the slurry, is fully mixed with the negative electrode active material through the slurry mixing process, is uniformly distributed, does not change the existing process, and has the advantages of convenience in implementation and low cost.
Another object of the present invention is to provide a method for synthesizing the negative electrode additive.
In order to realize the purpose, the following technical scheme is adopted:
a synthesis method of a negative electrode additive comprises the following steps:
s1: mixing a phosphoric acid solution and melamine powder in proportion, stirring, heating to 50-150 ℃, reacting for 1-6 h, heating to 150-300 ℃, and reacting for 1-6 h to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, stirring, heating to 250-350 ℃, and reacting for 1-6 h to obtain melamine lithium polyphosphate.
In the step S1, the mixing ratio of the phosphoric acid to the melamine is 1: 0.9-1: 1.15.
The invention also aims to provide a negative pole piece.
In order to realize the purpose, the following technical scheme is adopted:
a negative pole piece comprises a current collector, an active substance, a conductive agent, a binder, a thickening agent and the negative additive.
Preferably, the active substance is one or a mixture of more of a graphite material, a metal silicon material or a silicon oxide material.
Preferably, the content of the negative electrode additive in the negative electrode plate is 0.1-10% of the weight of all coating materials.
Preferably, the content of the additive in the negative pole piece is 1-5% of the weight of all coating materials.
Another object of the present invention is to provide a lithium ion battery.
In order to realize the purpose, the following technical scheme is adopted:
a lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and a packaging material, wherein the negative pole piece is arranged on the negative pole piece.
Further, the active material used by the positive pole piece is one or a mixture of more of lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, lithium manganese iron phosphate, lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminate.
Compared with the prior art, the invention has the following beneficial effects:
(1) the additive contains abundant N, P groups, and can form a glass-like substance layer which is difficult to volatilize when the temperature of the battery rises, so that the additive can insulate heat and oxygen, reduce the flammability of the battery and improve the safety of the battery; (2) the additive contains rich double bond oxygen, can form hydrogen bond connection with functional groups on the surface of a negative active material, particularly hydroxyl functional groups, and is adsorbed on the surface of a negative electrode, so that the combustion of the negative electrode is prevented, and other parts are not polluted; (3) the additive is lithiated, so that lithium ions are not consumed during first charging, and the coulomb efficiency of the battery is not reduced; (4) the additive is attached to the surface of a negative active material, and contains lithium ions which can be used as lithium ion channels, so that the resistance of the lithium ions inserted into the negative active material is reduced; (5) the additive is added during cathode slurry mixing, can be fully mixed with a cathode active material and is uniformly distributed, the existing process is not changed, the implementation is convenient, and the cost is low.
Detailed Description
The present invention will be described in further detail with reference to comparative examples and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Comparative example 1
Preparation of positive pole piece
The method comprises the steps of taking an NCM523 ternary material as a positive electrode active substance, adding 2% by mass of Super P (conductive carbon black) as a conductive agent, taking 3% by mass of PVDF (polyvinylidene fluoride) as an adhesive, stirring and mixing uniformly in an NMP (N-methyl pyrrolidone) solvent, coating the mixture on an aluminum foil current collector, drying, and rolling to a certain thickness to obtain the positive electrode plate.
Preparation of negative pole piece
The method comprises the steps of taking an artificial graphite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR (styrene butadiene rubber) with the mass ratio of 3% as an adhesive, CMC (carboxymethyl cellulose) with the mass ratio of 1% as a thickening agent, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
Preparation of the electrolyte
Ethylene Carbonate (EC), Propylene Carbonate (PC) and diethyl carbonate (DEC) were mixed at a volume ratio of 1:1:1 as a solvent, 1M LiPF6 was dissolved in the mixed solvent as a lithium salt, and VC (vinylene carbonate) at 2% of the electrolyte mass, VEC (vinyl ethylene carbonate) at 1% and FEC (fluoroethylene carbonate) at 2% were added as additives to form an electrolyte for a lithium ion secondary battery.
Preparation of the separator
A porous film made of pure PE (polyethylene) is selected as the isolating film.
Battery core forming
And placing the isolating membrane between the positive pole piece and the negative pole piece, and winding to obtain the bare cell. And placing the wound bare cell in an aluminum-plastic film bag with a pit punched in advance, pre-packaging the bare cell and reserving a liquid injection port.
Liquid injection
And placing the pre-packaged battery core in a vacuum furnace, fully baking and drying, injecting a certain amount of electrolyte, and packaging in a vacuum environment to obtain the lithium ion secondary battery.
Comparative example 2
Preparation of negative pole piece
The preparation method comprises the steps of taking a silicon oxide/graphite composite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 5% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Example 1
Preparation of the additives
Preparing phosphoric acid and melamine powder with a molar ratio of 1:1, and preparing the phosphoric acid into a solution, wherein the specific preparation steps are as follows:
s1: mixing a phosphoric acid solution with melamine powder, heating to 85 ℃ under stirring, reacting for 2 hours, and heating to 280 ℃ again, reacting for 4 hours to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, heating to 330 ℃ under the stirring condition, and reacting for 2h to obtain melamine lithium polyphosphate.
Preparation of negative pole piece
The preparation method comprises the steps of taking an artificial graphite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 3% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, melamine lithium polyphosphate with the mass ratio of 0.5% as an additive, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Example 2
Preparation of the additives
Preparing phosphoric acid and melamine powder with a molar ratio of 1:0.9, and preparing phosphoric acid into a phosphoric acid solution, wherein the specific preparation steps are as follows:
s1: mixing a phosphoric acid solution with melamine powder, heating to 85 ℃ under stirring, reacting for 2 hours, heating to 260 ℃ and reacting for 4 hours to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, heating to 300 ℃ under the stirring condition, and reacting for 2h to obtain melamine lithium polyphosphate.
Preparation of negative pole piece
The method comprises the steps of taking an artificial graphite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 3% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, melamine lithium polyphosphate with the mass ratio of 3% as an additive, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Example 3
Preparation of the additives
Preparing phosphoric acid and melamine powder with a molar ratio of 1:1, and preparing phosphoric acid into a phosphoric acid solution, wherein the specific preparation steps are as follows:
s1: mixing a phosphoric acid solution with melamine powder, heating to 85 ℃ under stirring, reacting for 2 hours, heating to 260 ℃ and reacting for 4 hours to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, heating to 300 ℃ under the stirring condition, and reacting for 2h to obtain melamine lithium polyphosphate.
Preparation of negative pole piece
The method comprises the steps of taking an artificial graphite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 3% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, melamine lithium polyphosphate with the mass ratio of 5% as an additive, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Example 4
Preparation of the additives
Preparing phosphoric acid and melamine powder with a molar ratio of 1:1.15, and preparing phosphoric acid into a phosphoric acid solution, wherein the specific preparation steps are as follows:
s1: mixing a phosphoric acid solution with melamine powder, heating to 85 ℃ under stirring, reacting for 2 hours, heating to 250 ℃ and reacting for 4 hours to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, heating to 300 ℃ under the stirring condition, and reacting for 2h to obtain melamine lithium polyphosphate.
Preparation of negative pole piece
The method comprises the steps of taking an artificial graphite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 3% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, melamine lithium polyphosphate with the mass ratio of 10% as an additive, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Example 5
Preparation of the additives
Preparing phosphoric acid and melamine powder with a molar ratio of 1:1, and preparing phosphoric acid into a phosphoric acid solution, wherein the specific preparation steps are as follows:
s1: mixing a phosphoric acid solution with melamine powder, heating to 85 ℃ under stirring, reacting for 2 hours, heating to 260 ℃ and reacting for 4 hours to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, heating to 300 ℃ under the stirring condition, and reacting for 2h to obtain melamine lithium polyphosphate.
Preparation of negative pole piece
The preparation method comprises the steps of taking a silicon oxide/graphite composite material as a negative electrode active substance, adding Super P with the mass ratio of 2% as a conductive agent, SBR with the mass ratio of 6% as a bonding agent, CMC with the mass ratio of 1% as a thickening agent, melamine lithium polyphosphate with the mass ratio of 6% as an additive, uniformly mixing in a deionized water solvent, coating the mixture on a copper foil current collector, drying, and rolling to a certain thickness to obtain a negative electrode plate.
The rest is the same as comparative example 1 and will not be described herein.
Ten batteries of comparative example 1 to comparative example 2 and example 1 to example 5 were each subjected to static aging, and then were subjected to constant current charging at a current of 0.5C to 4.2V and constant voltage to a current of 0.05C, and the total capacity of the constant current and constant voltage processes was taken as the charging capacity. And then discharging to 3.0V at a constant current of 0.5C, and taking the capacity in the constant current discharge process as the discharge capacity. The first charge-discharge coulombic efficiency was determined by dividing the discharge capacity by the charge capacity. The average first charge-discharge coulombic efficiency for each battery group is shown in table 1:
TABLE 1 initial charge-discharge coulombic efficiency for each battery group
| Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| 92.3％ | 81.5％ | 92.2％ | 92.7％ | 92.5％ | 92.4％ | 83.6％ |
As shown in table 1, the battery of comparative example 1, which used artificial graphite as the negative electrode material but did not use the negative electrode additive, had an average first charge-discharge coulombic efficiency of 92.3%. The batteries of examples 1-4 used different amounts of negative electrode additive in the graphite negative electrode, and the first charge-discharge average coulombic efficiency was slightly higher than the battery of comparative example 1. This is probably because the double-bonded oxygen in the negative electrode additive is first bonded to the functional group on the surface of the negative electrode material, reducing the side reaction of lithium consumption during the first charge. This phenomenon is more pronounced in silicon carbon negative electrode cells, probably because the surface of the silicon carbon negative electrode material is more abundant in functional groups.
Then, each of the ten batteries of comparative examples 1 to 2 and examples 1 to 5 was constant-current charged to 4.2V at a current of 0.5C and was constant-voltage charged to a current of 0.05C to reach a fully charged state. The fully charged batteries are averagely divided into two groups, and each group of five batteries is respectively subjected to mechanical damage tests of extrusion and impact, so that the batteries achieve the purposes of surface fracture and contact with air. The test results are shown in table 2.
TABLE 2 extrusion and impact safety test results for each battery pack
| Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Extrusion | 2/5pass | 3/5pass | 5/5pass | 5/5pass | 5/5pass | 5/5pass | 5/5pass |
| Impact of | 3/5pass | 2/5pass | 5/5pass | 5/5pass | 5/5pass | 5/5pass | 5/5pass |
As can be seen from table 2, the batteries of comparative examples 1 and 2 did not use the negative electrode additive and could not completely pass the press and impact test. The battery of each embodiment adopts the cathode additive, and can completely pass extrusion and impact tests, so that the safety performance is obviously improved. This is because the crush and impact test destroys the cell structure, bringing the inside of the cell into contact with air. The fully charged negative electrode without the negative electrode additive has strong reducibility and undergoes a rapid oxidation reaction with oxygen in the air to cause combustion. The battery in the embodiment uses the negative electrode additive, and the abundant nitrogen and phosphorus groups of the negative electrode additive can form a glass material which is difficult to volatilize on the surface of the negative electrode material, so that the contact between air and a negative electrode active material is isolated, the oxidation reaction rate is reduced, and the purpose of battery safety is achieved.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. An anode additive comprising a compound represented by the structure of formula I, wherein the formula of formula I is as follows:
wherein the value range of n is 1-8.
2. A preparation method of a negative electrode additive is characterized by comprising the following steps: the preparation method comprises the following steps:
s1: mixing a phosphoric acid solution and melamine powder in proportion, stirring, heating to 50-150 ℃, reacting for 1-6 h, heating to 150-300 ℃, and reacting for 1-6 h to obtain a melamine phosphate intermediate;
s2: and adding LiOH powder into the melamine phosphate intermediate, stirring, heating to 250-350 ℃, and reacting for 1-6 h to obtain melamine lithium polyphosphate.
3. The method for preparing the negative electrode additive according to claim 2, wherein the mixing ratio of the phosphoric acid to the melamine in the step S1 is 1:0.9 to 1: 1.15.
4. A negative electrode plate is characterized by comprising a current collector, an active material, a conductive agent, a binder, a thickening agent and the negative electrode additive of claim 1 or the negative electrode additive prepared by the preparation method of claim 2.
5. The negative electrode plate as claimed in claim 4, wherein the active material is one or more of graphite material, metal silicon material and silicon oxide material.
6. The negative electrode plate as claimed in claim 1, wherein the content of the negative electrode additive in the negative electrode plate is 0.1-10% of the weight of all the coating materials.
7. The negative pole piece of claim 5, wherein the content of the additive in the negative pole piece is 1-5% of the weight of all the coating materials.
8. A lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and a packaging material, and is characterized in that the negative pole piece is the negative pole piece of any one of claims 4 to 7.
9. The lithium ion battery of claim 8, wherein the active material used in the positive electrode plate is one or a mixture of lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, lithium iron manganese phosphate, lithium nickel cobalt manganate, and lithium nickel cobalt aluminate.
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| CN112551574A (en) * | 2020-12-11 | 2021-03-26 | 桐乡市鸿信科技合伙企业(有限合伙) | Sulfur-nitrogen doped porous carbon-coated Li4Ti5O12Lithium ion battery cathode material and preparation method thereof |
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