CN114725379B - Electrode active material, lithium ion battery composite positive plate and lithium ion battery - Google Patents

Electrode active material, lithium ion battery composite positive plate and lithium ion battery Download PDF

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CN114725379B
CN114725379B CN202210485398.7A CN202210485398A CN114725379B CN 114725379 B CN114725379 B CN 114725379B CN 202210485398 A CN202210485398 A CN 202210485398A CN 114725379 B CN114725379 B CN 114725379B
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lithium ion
battery
ion battery
active material
electrode active
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CN114725379A (en
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袁帅
承沁宇
施利毅
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • H01M2004/028—Positive electrodes
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides an electrode active material, a lithium ion battery composite positive plate and a lithium ion battery, and belongs to the technical field of electrode materials and batteries, wherein the electrode active material is an organic nitrogen-containing carbon material which is prepared by sintering cyano-containing aromatic compounds; wherein the number of the cyano groups is more than or equal to 2. The embodiment of the application provides an electrode active material which does not contain lithium element by using the organic nitrogen-containing carbon material, so that the use of heavy metals in batteries such as lithium batteries and the like is avoided. When applied to lithium ion batteries, the lithium ion battery has the characteristics of good cycle stability and high capacitance, and can be used at 0.1C (37.2 mAg ‑1 ) The capacity remains high after 100 cycles of current density.

Description

Electrode active material, lithium ion battery composite positive plate and lithium ion battery
Technical Field
The application relates to the technical field of electrode materials and batteries, in particular to an electrode active material, a lithium ion battery composite positive plate and a lithium ion battery.
Background
With the rapid development of energy storage device technology and electric automobile fields, rechargeable batteries applicable to different scenes have been developed. Currently, metal-based Lithium Ion Batteries (LIBs) have been the most successful case since the successful commercialization in 1991, but there are problems of heavy metal contamination in existing batteries such as lithium ion batteries.
Disclosure of Invention
The embodiment of the application provides an electrode active material, a lithium ion battery composite positive plate and a lithium ion battery, so as to solve the technical problem of heavy metal pollution in the existing batteries such as the lithium ion battery.
In a first aspect, embodiments of the present application provide an electrode active material that is an organic nitrogen-containing carbon material prepared by sintering a cyano-containing aromatic compound; wherein the number of the cyano groups is more than or equal to 2.
Further, the organic nitrogen-containing carbon material has a porous structure, and the pore diameter of the organic nitrogen-containing carbon material is 0.6-0.8nm.
Further, the main chemical elements of the organic nitrogen-containing carbon material include, in mass fraction: 20-65% of C; 20-40% of N.
Further, the cyano-containing aromatic compound includes at least one of HAT-CN, terephthalcyano derivatives, and 7, 8-tetracyanoquinodimethane.
Further, the sintering process parameters are as follows: the temperature is 450-650 ℃ and the time is 1-3h.
In a second aspect, embodiments of the present application provide an application of the electrode active material in the first aspect in preparing a battery pole piece and/or preparing a battery.
In a third aspect, an embodiment of the present application provides a lithium ion battery composite positive plate, where the lithium ion battery composite positive plate includes a battery pole piece and a functional coating on a surface of the battery pole piece;
the functional coating comprises: the electrode active material according to the first aspect.
Further, the functional coating further comprises: a composite binder;
the composite binder comprises the following raw materials in percentage by mass: PEDOT 5-8%, polyether thiourea 5-8%, perfluorosulfonic acid resin 0.5-1.0%, carbon nano tube 1-2%, and solvent in balance.
Further, the mass ratio of the composite binder to the electrode active material is (10-20): (80-90).
In a fourth aspect, embodiments of the present application provide a lithium ion battery comprising a battery positive electrode, a battery negative electrode, a separator, and an electrolyte;
the battery anode is the lithium ion battery composite anode piece in the third aspect;
the battery cathode is made of inorganic material after pre-lithiation.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the electrode active material provided by the embodiment of the application, the organic nitrogen-containing carbon material is used as an electrode active material which does not contain lithium elements, the cyano-containing aromatic compound with small molecular weight and a pi conjugated structure formed by nitrogen atoms and lone pair electrons is sintered, and then synthesized in a thermal sintering polymerization mode, and the cyano in the structure is lost in the process to realize polymerization of small molecules, so that the electrode active material with multiple active sites and high theoretical capacity and high molecular weight is obtained, the use of heavy metals in batteries such as lithium batteries is avoided, the pollution of the traditional waste batteries to the environment is reduced, and the electrode active material is green and environment-friendly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is an electron microscope (SEM) image of an organic nitrogen-containing carbon material provided in an embodiment of the present application;
FIG. 2 is a graph showing pore size distribution of an organic nitrogen-containing carbon material according to an embodiment of the present application;
FIG. 3 is a diagram showing N of an organic nitrogen-containing carbon material according to an embodiment of the present application 2 Adsorption-desorption profiles;
fig. 4 is a cycle chart of a lithium ion battery provided in an embodiment of the present application;
fig. 5 is a charge-discharge curve of a lithium ion battery according to an embodiment of the present application.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
With the rapid development of energy storage device technology and electric automobile fields, rechargeable batteries applicable to different scenes have been developed. Currently, metal-based Lithium Ion Batteries (LIBs) have been the most successful case since the successful commercialization in 1991, but the existing batteries such as lithium ion batteries have problems of heavy metal pollution and difficult recovery.
The technical scheme provided by the embodiment of the invention aims to solve the technical problems, and the overall thought is as follows:
in a first aspect, embodiments of the present application provide an electrode active material, where the electrode active material is an organic nitrogen-containing carbon material, and the organic nitrogen-containing carbon material is prepared by sintering an aromatic compound containing cyano groups; wherein the number of the cyano groups is more than or equal to 2. Since the synthesis is performed by means of thermal sintering polymerization, the process realizes polymerization of small molecules by losing cyano groups in the structure, and when the sintering temperature and time are increased, the lost mass in the structure is increased, so that the N element duty ratio is reduced, and the expected carbon-nitrogen ratio can be obtained by controlling proper sintering conditions.
According to the embodiment of the application, the organic nitrogen-containing carbon material is used as an electrode active material without lithium element, the cyano-containing aromatic compound with small molecular weight and pi conjugated structure formed by nitrogen atoms and lone pair electrons is sintered, and then synthesized in a thermal sintering polymerization mode, and the cyano in the structure is lost in the process to realize polymerization of the small molecules, so that the electrode active material with multiple active sites and high theoretical capacity and high molecular weight is obtained, and the use of heavy metals in batteries such as lithium batteries is avoided.
Aromatic compounds are compounds having an aromatic ring structure, and whether they have aromaticity can be determined according to the rule of shock. Typical representatives may include benzene and its derivatives, naphthalene and its derivatives, anthracene and its derivatives, phenanthrene and its derivatives, such as compounds containing pyridine or pyrazine heterocyclic structures, other aromatic compounds.
As an implementation mode of the embodiment of the invention, the organic nitrogen-containing carbon material has a porous structure, and the pore diameter of the organic nitrogen-containing carbon material is 0.6-0.8nm.
The organic nitrogen-containing carbon material has a porous structure and pore diameter of 0.6-0.8nm, and has the function of screening molecules and ions with specific sizes to enter and exit the positive electrode structure, so that the dissolution of residual small organic molecules into the electrolyte can be inhibited, and the capacitance and the circulation stability can be improved.
As an implementation mode of the embodiment of the present invention, the main chemical elements of the organic nitrogen-containing carbon material include, in mass fraction: 20-65% of C; 20-40% of N.
After sintering treatment, the organic nitrogen-containing carbon material with moderate carbon-nitrogen element content is obtained, which is beneficial to improving the cycle stability and capacitance of the electrode.
As an embodiment of the present invention, the cyano-containing aromatic compound includes at least one of HAT-CN, terephthalcyano derivatives and 7, 8-tetracyanoquinodimethane.
The cyano-containing aromatic compound with small molecular weight is selected to realize polymerization of small molecules through thermal condensation reaction of cyano groups, and a plurality of aromatic rings are bridged together through N atoms on the aromatic compound to form a large conjugated system to realize intramolecular electron transfer, so that the obtained high-molecular-weight organic nitrogen-containing carbon material has better cycle stability and capacitance.
As an implementation manner of the embodiment of the present invention, the sintering process parameters are as follows: the temperature is 450-650 ℃ and the time is 1-3h.
For the cyano-containing aromatic compound with small molecular weight, the obtained high molecular weight organic nitrogen-containing carbon material has better cycle stability and capacitance under the sintering process parameters. The adverse effect of too high or too long sintering temperature and time is that the content loss of N element serving as an active site is too large, so that the theoretical capacity is reduced, the adverse effect of too low or too short sintering temperature and time is that the polymerization of small molecular organic matters is incomplete, the solubility in electrolyte is still high, and the material cycle stability is rapidly attenuated. In some specific embodiments, the temperature may be 450 ℃,480 ℃,500 ℃,550 ℃,580 ℃,600 ℃,650 ℃; the time can be 1h,1.5h,2h,2.5h,3h.
In a second aspect, based on the same inventive concept, embodiments of the present application provide an application of the electrode active material according to the first aspect in preparing a battery pole piece and/or preparing a battery.
The electrode active material of the first aspect is applied to the preparation of a battery pole piece and/or the preparation of a battery, so that the problems of difficult recovery and heavy metal pollution of the traditional battery are avoided, and the electrode active material has the characteristics of good cycle stability and high capacitance.
In a third aspect, based on the same inventive concept, an embodiment of the present application provides a lithium ion battery composite positive plate, where the lithium ion battery composite positive plate includes a battery pole piece and a functional coating on a surface of the battery pole piece;
the functional coating comprises: the electrode active material according to the first aspect.
The lithium ion battery composite positive plate provided by the embodiment of the application adopts the electrode active material which does not contain lithium element as the functional substance of the battery positive electrode, so that the problems of difficult recovery and heavy metal pollution of the traditional battery are avoided, and the lithium ion battery composite positive plate has the characteristics of good circulation stability and high capacitance.
As an implementation of the embodiment of the present invention, the functional coating further includes: a composite binder;
the composite binder comprises the following raw materials in percentage by mass: PEDOT (polyether sulfone sulfonate) 2-8 wt%, polyether thiourea 2-8 wt%, perfluorinated sulfonic acid resin 0.5-1.5 wt%, carbon nanotube 1-3 wt% and solvent for the rest.
The composite binder provided by the embodiment of the application improves the density of the electrode active material in the lithium ion battery composite positive plate, and greatly inhibits the attenuation of small organic molecules in the electrode active material; meanwhile, the electrode active material can be further endowed with extremely strong conductive performance, and the capacity of the material can be better exerted. Specifically: PEDOT and PSS have the functions of conducting electrons to form a conductive network, wherein the adverse effect of excessive use of the PEDOT and PSS is that the PEDOT is not a battery active component, the excessive use of the PEDOT is unfavorable for the energy density of a positive electrode, and the adverse effect of too low use of the PEDOT is that the conductivity of a positive electrode system is not improved enough; the polyether thiourea has the functions of an elastic polymer which is used as an adhesive to combine an active component with a conductive network, and can inhibit the corrosion damage of an anode structure by electrolyte in the circulating process due to the existence of disulfide bonds with self-healing property, wherein the excessive consumption of the polyether thiourea has the adverse effects that the non-conductive consumption of the polyether thiourea can block the electron transmission in the structure, and the too low adverse effects that the active material and the conductive network cannot be well contacted with each other and the transmission barrier of electrons or ions can be formed locally; the perfluorinated sulfonic acid resin has the effects that the sulfonic acid group in the structure is used as an intermediate to bear a transmission channel of lithium ions between electrolyte and an active material, so that the lithium ion conduction capacity in a positive electrode system is improved, the capacity exertion under high speed is facilitated, the excessive consumption of the perfluorinated sulfonic acid resin has the adverse effect that the perfluorinated sulfonic acid resin has acidity with certain strength, the excessive consumption can generate certain damage effect on the stability of the structure, the progress of side reaction is aggravated, and the excessively low adverse effect is that when the intermediate carrier used for transmitting lithium ions in the positive electrode system is fewer, the lithium ions cannot well act with the structure of the active material under high speed, so that the capacity exertion is obviously reduced; the carbon nano tube has the functions of being combined with PEDOT and PSS to form a three-dimensional conductive structure, and the synergistic effect of the carbon nano tube improves the conductivity of the system, wherein the excessive use of the carbon nano tube has the adverse effects that lithium ion binding sites cannot be provided, the energy density can be reduced, the excessively low adverse effects that a three-dimensional conductive network cannot be formed, and the conductivity can be influenced to a certain extent; the solvent is used to disperse the raw materials of each component in the system, and preferably, the solvent can be selected from NMP, DMSO and the like.
As an implementation mode of the embodiment of the invention, the mass ratio of the composite binder to the electrode active material is (10-20) (80-90).
The mass ratio of the composite binder to the electrode active material is proper, so that the overall performance of the lithium ion battery composite positive plate is good. The negative effects of the ratio of the two are that the conductive adhesive does not provide capacity contribution in the lithium battery circulation process, the energy density of the battery can be reduced, and the negative effects of the ratio of the two are that the network structure of the conductive adhesive and the lithium conductive adhesive is incomplete, so that the internal resistance of the battery is increased, and the dynamic performance is reduced.
According to a fourth aspect, based on the same inventive concept, an embodiment of the present application provides a lithium ion battery, which is characterized in that the lithium ion battery includes a battery positive electrode, a battery negative electrode, a separator, and an electrolyte;
the battery anode is the lithium ion battery composite anode piece in the third aspect;
the battery cathode is made of inorganic material after pre-lithiation.
The lithium ion battery provided by the embodiment of the application is a lithium ion full battery without transition metal, and the battery anode of the lithium ion full battery is made of an organic anode material without lithium element; the battery cathode is made of an inorganic material subjected to pre-lithiation treatment, so that the problems of difficult recovery and heavy metal pollution of the traditional lithium battery are avoided, and the battery is environment-friendly; and it still maintains a high capacity after 100 cycles at a current density of 0.1C (37.2 mAg-1). Wherein the inorganic materials, separator and electrolyte can be selected according to the disclosure of the prior art, for example, the inorganic materials can be selected from conventional inorganic materials such as nano silicon, graphite, hard carbon and the like; the membrane can be selected from polyethylene membrane, glass fiber and other membranes; the electrolyte may be selected from materials consisting of lithium salts and mixed organic solvents, such as LiClO 4 PC (propylene carbonate) +DME (dimethylethylene glycol), PC+DME, PC+DME+EC (ethylene carbonate), EC+DEC (diethyl carbonate), liAsF6/EC+THF (tetrahydrofuran), liPF 6 Other electrolytes such as EC/DEC solution and DOL/DME solution of LiTFSI.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
The present example provides a method for preparing an electrode active material, comprising: and (3) putting 0.5g of HAT-CN into a tube furnace, and calcining under the nitrogen atmosphere, wherein the calcining temperature is 550 ℃, the calcining time is 1 hour, and the temperature climbing rate of the tube furnace is 4 ℃/min, so that the final product, namely the organic nitrogen-containing carbon material, namely the electrode active material is obtained.
Electron Microscope (SEM) images, pore size distribution diagrams and BET test result images of the organic nitrogen-containing carbon material obtained in this example are shown in fig. 1, fig. 2 and fig. 3, respectively; the electron microscope testing method of the organic nitrogen-containing carbon material comprises the following steps of: characterizing the surface morphology microstructure of the organic nitrogen-containing carbon material in a secondary electron mode by adopting a high-resolution field emission scanning electron microscope (FEI Nova Nano-SEM 450); pore size distribution test and N of organic nitrogen-containing carbon material 2 The adsorption-desorption specific surface area test step includes: both BET surface area and pore size distribution were measured at 77K using a 3flex 5.02 model apparatus.
As can be seen from FIGS. 1 to 3, the organic nitrogen-containing carbon material obtained in this example has a porous structure with a pore size of 0.75nm and a BET specific surface area of 747.5m 2 /g。
The experimental basic information and the results of elemental analysis of the organic nitrogen-containing carbon material obtained in this example are shown in table 1.
TABLE 1
Example 2
The example provides a preparation method of a lithium ion battery composite positive plate, which comprises the following steps:
dispersing a composite binder and the electrode active material prepared in example 1 in a solvent (specifically NMP) according to a mass ratio of 1:9 to obtain a mixed slurry; the composite binder is prepared by uniformly stirring 5% of PEDOT (polyether urethane) PSS and 5% of polyether thiourea, and then adding 1% of perfluorinated sulfonic acid resin and 2% of carbon nano tube for stirring and mixing;
and coating the mixed slurry on the surface of a battery pole piece, and drying to obtain the lithium ion battery composite positive pole piece.
Example 3
The example provides a method for preparing an inorganic material after prelithiation, which comprises the steps of enabling the inorganic material to contain lithium through an electrochemical prelithiation method, wherein a diaphragm is a polyethylene film, and an electrolyte is 1mol/L LiPF 6 EC/DEC solution of (c). The method specifically comprises the following steps: si (inorganic anode material without lithium), acetylene black serving as a conductive agent and PAA serving as a binder are prepared into slurry according to a mass ratio of 8:1:1, the slurry is coated on a copper foil, and the copper foil is cut into pole pieces with the diameter of 1cm and dried. Assembling the prepared pole piece and a lithium piece into a half-battery with the model 2032; wherein a commercial polyethylene separator was used and a small amount of 1mol/L LiPF was added dropwise 6 Electrolyte of EC/DEC at 0.1 A.g -1 The current density of the lithium-ion battery is that the Si negative electrode is charged and discharged for 2 times in the interval of 0.001-1.5V, then the discharge is finished to 0.001V, finally the battery is dismantled, and the lithiated Si negative electrode is taken out, so that the pre-lithiated Si negative electrode material is obtained.
Example 4
The example provides a preparation method of a lithium ion battery, comprising the following steps: the composite positive plate of the lithium ion battery obtained in the embodiment 2, the Si negative electrode obtained in the embodiment 3 after the pre-lithiation, positive and negative electrode shells of 2016 type and gaskets are assembled into a button type full battery; wherein the diaphragm is glass fiber, and the electrolyte is 1mol/L LiPF 6 EC/DEC solution of (c).
The cycle graph and charge-discharge graph distribution of the lithium ion battery obtained in this example are shown in fig. 4 and 5. The testing steps of the cycle curve graph and the charge-discharge curve graph of the lithium ion battery comprise the following steps: and adopting LANHE system of Wuhan blue electric limited company to make charge-discharge circulation in the voltage range of 0.5-3.4V.
As can be seen from fig. 4 and 5, the lithium ion battery provided in this example has the characteristics of good cycle stability and high capacity, and is capable of being used at 0.1C (37.2 mg -1 ) Is still ensured after 100 circles of circulation under the current densityThe capacity is kept high (the capacity is 140.7mAh g -1 ). The lithium ion battery is a lithium ion full battery without transition metal, and the battery anode adopts an organic anode material without lithium element; the battery cathode is made of inorganic materials after pre-lithiation treatment, so that the problems of difficult recovery and heavy metal pollution of the traditional lithium battery are avoided, and the battery is environment-friendly.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (2)

1. The lithium ion battery composite positive plate is characterized by comprising a battery pole piece and a functional coating on the surface of the battery pole piece; the functional coating includes an electrode active material and a composite binder, the composite binder including at least one of a metal oxide and a metal oxideThe following raw materials in percentage by mass: PEDOT 5-8%, polyether thiourea 5-8%, perfluorosulfonic acid resin 0.5-1.0%, carbon nano tube 1-2%, and solvent in balance, wherein the mass ratio of the composite binder to the electrode active material is (10-20): (80-90), the electrode active material is prepared by placing 0.5g HAT-CN into a tube furnace, calcining under nitrogen atmosphere at 550 ℃ for 1h, and the temperature rising rate of the tube furnace is 4 ℃/min, the organic nitrogen-containing carbon material has a porous structure, the pore diameter of the porous structure is 0.75nm, and the BET specific surface area is 747.5m 2 /g。
2. The lithium ion battery is characterized by comprising a battery positive electrode, a battery negative electrode, a diaphragm and electrolyte;
the battery anode is the lithium ion battery composite anode piece of claim 1;
the battery cathode is made of inorganic material after pre-lithiation.
CN202210485398.7A 2022-05-06 2022-05-06 Electrode active material, lithium ion battery composite positive plate and lithium ion battery Active CN114725379B (en)

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