CN108400334A - A kind of method of modifying of lithium ion cell electrode - Google Patents

A kind of method of modifying of lithium ion cell electrode Download PDF

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Publication number
CN108400334A
CN108400334A CN201810091731.XA CN201810091731A CN108400334A CN 108400334 A CN108400334 A CN 108400334A CN 201810091731 A CN201810091731 A CN 201810091731A CN 108400334 A CN108400334 A CN 108400334A
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pedot
pss
lithium ion
modifying
ion cell
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丁昭郡
张哲旭
夏悦
石玉磊
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Shenzhen Qingxin Power Supply Research Institute
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Shenzhen Qingxin Power Supply Research Institute
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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
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • 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
    • H01M4/139—Processes of manufacture
    • 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)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention belongs to technical field of lithium ion more particularly to a kind of method of modifying of lithium ion cell electrode.Using PEDOT:PSS（Poly- 3,4 ethene dioxythiophenes：Poly styrene sulfonate）Lithium ion cell electrode is modified comprising following steps：Modification procedure 1：Use PEDOT:Binders of the PSS as electrode；And/or modification procedure 2：It is coated with one layer of PEDOT in the pole piece for completing coating:PSS.Two steps realize in different ways electronics microsphere surface run it is unobstructed, so that microballoon each section activity is not fully exerted, active material realization theory charge/discharge capacity, meanwhile, the PEDOT in conductive particle clad and step 2 in step 1:PSS conductive coatings play immobilization role to microballoon, and the latter is made to be not easy to fall off from electrode surface, and electrode, which is realized, stablizes charge/discharge capacity.

Description

A kind of method of modifying of lithium ion cell electrode
Technical field
The invention belongs to technical field of lithium ion more particularly to a kind of method of modifying of lithium ion cell electrode.
Background technology
The volume energy density and portability of lithium ion battery of new generation face increasingly higher demands, this must be by Gao Zhen The electrode material of real density is realized, and high grain size can just obtain high-tap density.The common lithium ion battery battery of current battery factory Pole material：The LiFePO4 and lithium titanate that cobalt acid lithium, NMC (nickel manganese cobalt ternary), some spray drying processes obtain, grain size compared with Greatly, D50 is often in 8-12 μ ms.Meanwhile the silicium cathode material for high-energy density of making a spurt, some conversion hysteria negative materials, The mode of Chang Yi great grain size micron balls occurs.Compared with the grain size of these active materials, acetylene black, the conductive agents such as super carbon black Grain size then very little, often within the scope of 30-50nm, or even only more than ten nanometer.Big micron ball and small conductive nano particle It mutually arranges in pairs or groups, can the latter become the key of electrode performance in the former coated with uniform.Conventional is viscous by the PVDF of solvent of NMP Agent is tied, usually can not achieve ideal effect, as shown in Fig. 1, conductive particle 10 in horizontal substrate, cannot be wrapped effectively mostly Microballoon 20 (30 be bonding agent in Fig. 1) is wrapped up in, this will produce two consequences：The electric conductivity of microballoon itself is relatively low, the portion of surface exposure It is that electronics conducts the part being obstructed to divide, and finally, microballoon top half electronics can not transmit over, and entire microballoon has nearly half to be Inactive, the capacity performance of electrode is far below theoretical capacity.Meanwhile microballoon easily falls off from electrode surface in cyclic process, Electrode capacity is caused to be decayed.
In view of this, the present invention is intended to provide a kind of being based on PEDOT:The method of modifying of the lithium ion cell electrode of PSS leads to It crosses in electrode dispensing with PEDOT:PSS does binder, uniform cladding of the realization conductive nano particle on active microsphere surface；Or Person is in the electrode surface coating a thin layer PEDOT for completing coating:PSS makes active microsphere surface effectively be wrapped up by conductive particle Position and exposed position are simultaneously by PEDOT:PSS conductive coatings cover.Above-mentioned method of modifying keeps electronics logical in microsphere surface operation Freely, microballoon each section activity is not fully exerted, active material realization theory charge/discharge capacity.Meanwhile conductive particle clad And PEDOT:PSS conductive coatings play immobilization role to microballoon, and the latter is made to be not easy to fall off from electrode surface, and electrode is realized steady Determine charge/discharge capacity.
Invention content
It is an object of the invention to：For in the lithium ion cell electrode for using conventional binders, nano-level conducting particle Microballoon part deactivation caused by active micron ball and caducous problem can not be effectively wrapped up, and a kind of lithium ion battery is provided The method of modifying of electrode.The core of this method is：In electrode dispensing with PEDOT:PSS makees binder, replaces traditional cementi Agent, uniform cladding of the realization conductive nano particle on active microsphere surface；Or it is thin in the electrode surface coating one for completing coating Layer PEDOT:PSS makes active microsphere surface by position that conductive particle effectively wraps up and exposed position by conductive coating while covering Lid.Above-mentioned two step can be used individually, also can on same pole piece composite application.Two steps realize electricity in different ways Son is unobstructed in microsphere surface operation, and microballoon each section activity is made to be not fully exerted, active material realization theory charge/discharge capacity, Meanwhile the PEDOT in the conductive particle clad and step 2 in step 1:PSS conductive coatings play fixation to microballoon and are turned into With, make the latter be not easy to fall off from electrode surface, electrode realize stablize charge/discharge capacity.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of method of modifying of lithium ion cell electrode, using PEDOT:PSS (poly- 3,4-rthylene dioxythiophenes：Polyphenyl second Alkene sulfonate) lithium ion cell electrode is modified comprising following steps：
Modification procedure 1：Use PEDOT:Binders of the PSS as electrode；
And/or
Modification procedure 2：It is coated with one layer of PEDOT in the pole piece for completing coating:PSS.
In the present invention, modification procedure 1 and modification procedure 2 can be used individually, also can on same pole piece composite application.Two Person can effectively improve the capacity performance of lithium ion cell electrode, the capacity of electrode when especially active agent particle size is micron order Performance.
In modification procedure 1, in electrode dispensing, after active material and conductive materials are mixed, by scheduled binder ratio The PEDOT of certain solid content is added in example:PSS aqueous solutions, are sufficiently stirred, and heating adjusts its viscosity, and (heating temperature is 30 DEG C -50 DEG C), until realizing paintable viscosity, finally film, drying obtain modified electrode on a current collector.The PEDOT:PSS water The solid content of solution is 0.5-10wt%；The mass percent of the binder is 1-30%.The grain size of active material is 0.3- 30μm.The active material is positive active material or negative electrode active material, and the positive active material is LiFePO4, cobalt acid At least one in lithium, lithium nickelate, LiMn2O4, cobalt nickel lithium manganate ternary material (NCM) and nickel cobalt lithium aluminate ternary material (NCA) Kind；The negative electrode active material is lithium titanate, Si-C composite material, transition metal oxide (such as ferroso-ferric oxide) and carbonate At least one of (such as cobalt carbonate)；The mass percent of the active material is 30-98%.Here several examples only have been lifted Son, as long as it can actually be used as the positive electrode and negative material of lithium ion battery.The quality hundred of the active material Divide than being 30-98%.The conductive materials are at least one of Super-P, acetylene black, Ketjen black and graphene；It is described to lead The mass percent of isoelectric substance is 1-40%.
In modification procedure 2, the method for modifying is specially：In the electrode surface of coated and dried completion, with spin coating or The mode of blade coating is coated with one layer of PEDOT:PSS aqueous solutions obtain PEDOT after dry:The modified electrode of PSS conductive coatings cladding. The PEDOT:The solid content of PSS aqueous solutions is 0.5-3wt%.After drying, PEDOT:The thickness of PSS conductive coatings is 20nm- 200nm.The grain size of active material in electrode is 0.3-30 μm.
Compared with the existing technology, the PEDOT in modification procedure 1:PSS binders can realize that conductive nano particle is micro- in activity The uniform cladding of ball surface, the PEDOT in modification procedure 2:It is conductive that PSS conductive coatings can cover active microsphere surface simultaneously The position and exposed position that particle effectively wraps up.Two modification procedures in different ways, can realize that electronics is transported in microsphere surface Row is unobstructed, so that microballoon each section activity is not fully exerted, active material realization theory charge/discharge capacity；Meanwhile modification procedure 1 In conductive particle clad and modification procedure 2 in PEDOT:PSS conductive coatings play immobilization role to microballoon, after making Person is not easy to fall off from electrode surface, and electrode, which is realized, stablizes charge/discharge capacity.To sum up, the present invention efficiently solves leads in the prior art Electric particle can not effectively wrap up microballoon part deactivation caused by active microsphere and caducous problem.
Description of the drawings
Fig. 1 does structural schematic diagram (10,20 and 30 difference of the electrodes of lithium-ion batteries of binder for PVDF in the prior art For PVDF binders, active material microballoon and conductive materials).
Fig. 2 is present invention PEDOT:PSS does structural schematic diagram (1,2 and 3 difference of the electrodes of lithium-ion batteries of binder For active material microballoon, PEDOT:PSS binders and conductive materials).
Fig. 3 is that the present invention makees binder with PVDF, and surface coats PEDOT:The structure of the electrodes of lithium-ion batteries of PSS films is shown (1,2 and 3 is respectively active material microballoon, PVDF binders and PEDOT to intention:PSS conductive coatings).
Fig. 4 is the charge/discharge capacity test result figure of the pole piece of comparative example 1 and embodiment 1 to 3.
Specific implementation mode
Below the technical scheme of the invention is illustrated by a specific example, but the scope of the present invention is not limited thereto.
Comparative example 1
By weight, pole piece S0 includes 70 parts of cobalt carbonates, 20 parts of acetylene blacks and 10 parts of PVDF, the grain size of cobalt carbonate D50 is 5 μm.
Embodiment 1
Based on [70 (cobalt carbonates)：20 (acetylene blacks)：10 (PVDF), parts by weight] cobalt carbonate cathode pole piece S0 (attached drawing 1), this Embodiment provide modification scheme be：By PEDOT:PSS substitutions PVDF makees binder, and implementation method is：The carbon for being 5 μm by D50 After sour cobalt microballoon and acetylene black mixing, the PEDOT that solid content is 5wt% is added in the ratio of scheduled binder:PSS is water-soluble Liquid is sufficiently stirred simultaneously 40 DEG C of low-temperature heats, and after realizing paintable viscosity, the film on copper foil is dry, obtains modified electrode S1 [70 (cobalt carbonates)：20 (acetylene blacks)：10(PEDOT:PSS)] (see Fig. 2 comprising microballoon 1, acetylene black 3 and bonding agent 2).
Embodiment 2
Based on [70 (cobalt carbonates)：20 (acetylene blacks)：10 (PVDF), parts by weight] cobalt carbonate cathode pole piece S0 (attached drawing 1), this Embodiment provide modification scheme be：It is coated with one layer of PEDOT in S0 pole pieces:PSS clads.Implementation method is：It completes Coated and dried S0 pole pieces, it is 1.5wt%'s that a thin layer (thickness 50nm) solid content is coated with by way of blade coating PEDOT:PSS aqueous solutions obtain PEDOT after dry:The modified electrode S2 of PSS conductive coatings cladding is (see Fig. 3 comprising microballoon 1, bonding agent 2 and conductive coating 3), wherein PEDOT:The thickness of PSS conductive coatings is within the scope of 20-100nm.
Embodiment 3
Based on [70 (cobalt carbonates)：20 (acetylene blacks)：10 (PVDF), parts by weight] cobalt carbonate cathode pole piece S0 (attached drawing 1), this Embodiment provide modification scheme be：
The first step, by PEDOT:PSS substitutions PVDF makees binder, and concrete methods of realizing is：The cobalt carbonate for being 5 μm by D50 After microballoon and acetylene black mixing, the PEDOT that solid content is 5wt% is added in the ratio of scheduled binder:PSS aqueous solutions, fill Divide stirring and 40 DEG C of low-temperature heats, after realizing paintable viscosity, the film on copper foil is dry, obtains modified electrode S1 [70 (cobalt carbonate)：20 (acetylene blacks)：10(PEDOT:PSS)].
Second step is coated with one layer of PEDOT in S0 pole pieces:PSS conductive coatings, concrete methods of realizing are：It completes to apply Cloth and the S1 pole pieces of drying are coated with the PEDOT that a thin layer solid content is 1.5wt% by way of blade coating:PSS is water-soluble Liquid obtains PEDOT after dry:The modified electrode S3, wherein PEDOT of PSS conductive coatings cladding:The thickness of PSS conductive coatings exists Within the scope of 20-100nm.
Charge-discharge test is carried out to the pole piece of comparative example 1 and embodiment 1 to 3, acquired results are shown in Fig. 4, can be seen by Fig. 4 Go out, the charge/discharge capacity of S1 and S2 in 0.2C improves about 500mAh/g, the charging of S3 is held in about 1000mAh/g than S0 Amount improves 200mAh/g again about in 1200mAh/g than S1.That is, compared with S0, the storage lithium performance of S1 and S2 have significantly It improves；Compared with S1, there has also been significantly improve for the storage lithium performance of S3.
Comparative example 2
By weight, pole piece S0 includes 80 parts of LiFePO4s, 10 parts of Super-P and 10 part of PVDF, LiFePO4 D50 It is 6 μm.
Embodiment 4
Based on [80 (LiFePO4s)：10(Super-P)：10 (PVDF), parts by weight] iron phosphate lithium positive pole pole piece S0, this reality Applying the modification scheme that example provides is：By PEDOT:PSS substitutions PVDF makees binder, and implementation method is：Phosphoric acid by D50 at 6 μm After iron lithium microballoon and acetylene black mixing, the PEDOT that solid content is 3wt% is added in the ratio of scheduled binder:PSS is water-soluble Liquid is sufficiently stirred simultaneously 40 DEG C of low-temperature heats, and after realizing paintable viscosity, the film on aluminium foil is dry, obtains modified electrode S1 [80 (LiFePO4s)：10(Super-P)：10(PEDOT:PSS)].
Embodiment 5
Based on [80 (LiFePO4s)：10(Super-P)：10 (PVDF), parts by weight] iron phosphate lithium positive pole pole piece S0, this reality Applying the modification scheme that example provides is：It is coated with one layer of PEDOT in S0 pole pieces:PSS conductive coatings.Concrete methods of realizing is： Complete coated and dried [80 (LiFePO4s)：10(Super-P)：10 (PVDF)] pole piece, it is applied by way of spin coating Cloth a thin layer solid content is the PEDOT of 0.5wt%:PSS aqueous solutions obtain PEDOT after dry:PSS conductive coatings cladding changes Property electrode S2, wherein PEDOT:The thickness of PSS conductive coatings is within the scope of 20-200nm.
Embodiment 6
Based on [80 (LiFePO4s)：10(Super-P)：10 (PVDF), parts by weight] iron phosphate lithium positive pole pole piece S0, this reality Applying the modification scheme that example provides is：
The first step is added by D50 after 6 μm of LiFePO4 microballoon and acetylene black mixes in the ratio of scheduled binder Enter the PEDOT that solid content is 3wt%:PSS aqueous solutions are sufficiently stirred simultaneously 40 DEG C of low-temperature heats, after realizing paintable viscosity, Film on aluminium foil, it is dry, obtain modified electrode S1 [80 (LiFePO4s)：10(Super-P)：10(PEDOT:PSS)].
Second step completes coated and dried S1 pole pieces, and a thin layer solid content is coated with by way of spin coating is The PEDOT of 0.5wt%:PSS aqueous solutions obtain PEDOT after dry:The modified electrode S3 of PSS conductive coatings cladding, wherein PEDOT:The thickness of PSS conductive coatings is within the scope of 20-200nm.
Charge/discharge capacities of the S1 and S2 in 0.2C improves about 50mAh/g, the charging of S3 in about 160mAh/g than S0 Capacity improves 10mAh/g again about in 170mAh/g than S1.It can be seen that compared with S0, the storage lithium performance of S1 and S2 have significantly It improves；Compared with S1, there has also been significantly improve for the storage lithium performance of S3.
Comparative example 3
By weight, pole piece S0 includes 82 parts of LiNi0.5Mn0.3Co0.2O2, 9 parts of Ketjen black and 9 parts of PVDF, LiNi0.5Mn0.3Co0.2O2Grain size D50 is 10 μm.
Embodiment 7
Based on [82 (LiNi0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9 (PVDF)] NCM anode pole piece S0, the present embodiment carries The modification scheme of confession is：By PEDOT:PSS substitutions PVDF makees binder, and implementation method is：By D50 at 10 μm LiNi0.5Mn0.3Co0.2O2(NCM) after microballoon and acetylene black mix, it is 6wt% that solid content, which is added, in the ratio of scheduled binder PEDOT:PSS aqueous solutions are sufficiently stirred simultaneously 40 DEG C of low-temperature heats, and after realizing paintable viscosity, the film on aluminium foil is done It is dry, obtain modified electrode S1 [82 (LiNi0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9(PEDOT:PSS)].
Embodiment 8
Based on [82 (LiNi0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9 (PVDF)] NCM anode pole piece S0, the present embodiment carries The modification scheme of confession is：It is coated with one layer of PEDOT in S0 pole pieces:PSS conductive coatings.Concrete methods of realizing is：It completes to apply Cloth and the [82 (LiNi of drying0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9 (PVDF)] pole piece, it is coated with by way of spin coating A thin layer solid content is the PEDOT of 1wt%:PSS aqueous solutions obtain PEDOT after dry:The modified electricity of PSS conductive coatings cladding Pole S2, wherein PEDOT:The thickness of PSS conductive coatings is within the scope of 50-200nm.
Embodiment 9
Based on [82 (LiNi0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9 (PVDF)] NCM anode pole piece S0, the present embodiment carries The modification scheme of confession is：
The first step, the LiNi by D50 at 10 μm0.5Mn0.3Co0.2O2(NCM) after microballoon and acetylene black mix, by scheduled The PEDOT that solid content is 6wt% is added in the ratio of binder:(the two mass ratio is 0.8 to PSS aqueous solutions:1) it, is sufficiently stirred simultaneously 40 DEG C of low-temperature heats, after realizing paintable viscosity, the film on aluminium foil is dry, obtains modified electrode S1 [82 (LiNi0.5Mn0.3Co0.2O2)：9 (Ketjen blacks)：9(PEDOT:PSS)].
Second step completes coated and dried S1 pole pieces, and a thin layer solid content is coated with by way of spin coating is 1% PEDOT:PSS aqueous solutions obtain PEDOT after dry:The modified electrode S3, wherein PEDOT of PSS conductive coatings cladding: The thickness of PSS conductive coatings is within the scope of 50-200nm.
Charge/discharge capacities of the S1 and S2 in 0.2C improves about 40mAh/g, the charging of S3 in about 140mAh/g than SO Capacity improves 10mAh/g again about in 150mAh/g than S1.It can be seen that compared with S0, the storage lithium performance of S1 and S2 have significantly It improves；Compared with S1, there has also been significantly improve for the storage lithium performance of S3.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party Formula is changed and is changed.Therefore, the invention is not limited in specific implementation modes disclosed and described above, to the present invention's Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.

Claims (10)

1. a kind of method of modifying of lithium ion cell electrode, it is characterised in that：Using PEDOT:PSS（Poly- 3,4- ethylene dioxies thiophene Pheno：Poly styrene sulfonate）Lithium ion cell electrode is modified comprising following steps：
Modification procedure 1：Use PEDOT:Binders of the PSS as electrode；
And/or
Modification procedure 2：It is coated with one layer of PEDOT in the pole piece for completing coating:PSS.
2. the method for modifying of lithium ion cell electrode according to claim 1, it is characterised in that：In modification procedure 1, in electricity When the dispensing of pole, after active material and conductive materials are mixed, the PEDOT of certain solid content is added in scheduled binder ratio: PSS aqueous solutions, are sufficiently stirred, and heating adjusts its viscosity, until realize paintable viscosity, finally film on a current collector, does It is dry, obtain modified electrode.
3. the method for modifying of lithium ion cell electrode according to claim 2, it is characterised in that：The PEDOT:PSS water The solid content of solution is 0.5-10wt%；The mass percent of the binder is 1-30%.
4. the method for modifying of lithium ion cell electrode according to claim 2, it is characterised in that：The grain size of active material is 0.3-30μm。
5. the method for modifying of lithium ion cell electrode according to claim 2, it is characterised in that：The active material is just Pole active material or negative electrode active material, the positive active material are LiFePO4, cobalt acid lithium, lithium nickelate, LiMn2O4, nickel cobalt LiMn2O4 ternary material（NCM）With nickel cobalt lithium aluminate ternary material（NCA）At least one of；The negative electrode active material is titanium At least one of sour lithium, Si-C composite material, transition metal oxide and carbonate；The mass percent of the active material For 30-98%.
6. the method for modifying of lithium ion cell electrode according to claim 2, it is characterised in that：The conductive materials are At least one of Super-P, acetylene black, Ketjen black and graphene；The mass percent of the conductive materials is 1-40%.
7. the method for modifying of lithium ion cell electrode according to claim 1, it is characterised in that：It is described in modification procedure 2 Method of modifying is specially：In the electrode surface of coated and dried completion, one layer of PEDOT is coated with by way of spin coating or blade coating: PSS aqueous solutions obtain PEDOT after dry:The modified electrode of PSS conductive coatings cladding.
8. the method for modifying of lithium ion cell electrode according to claim 7, it is characterised in that：The PEDOT:PSS water The solid content of solution is 0.5-3wt %.
9. the method for modifying of lithium ion cell electrode according to claim 7, it is characterised in that：After drying, PEDOT:PSS The thickness of conductive coating is 20nm-200nm.
10. the method for modifying of lithium ion cell electrode according to claim 7, it is characterised in that：Active matter in electrode The grain size of matter is 0.3-30 μm.
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CN109721713A (en) * 2018-12-27 2019-05-07 清远佳致新材料研究院有限公司 A kind of lithium ion battery anode glue size that conductivity is high and preparation method
CN109721713B (en) * 2018-12-27 2021-10-22 清远佳致新材料研究院有限公司 High-conductivity lithium ion battery positive electrode slurry and preparation method thereof
CN111048742A (en) * 2019-12-19 2020-04-21 惠州亿纬锂能股份有限公司 Pole piece containing core-shell silicon negative electrode material, and preparation method and application thereof
CN112909258A (en) * 2021-02-06 2021-06-04 陕西科技大学 Flexible positive and negative electrode material for high-performance magnesium-lithium double-salt ion battery and preparation method thereof

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Application publication date: 20180814