CN104218217A - Power battery lithium ion secondary battery pole piece - Google Patents

Power battery lithium ion secondary battery pole piece Download PDF

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Publication number
CN104218217A
CN104218217A CN201410381329.7A CN201410381329A CN104218217A CN 104218217 A CN104218217 A CN 104218217A CN 201410381329 A CN201410381329 A CN 201410381329A CN 104218217 A CN104218217 A CN 104218217A
Authority
CN
China
Prior art keywords
pole piece
acetylene black
lithium ion
pvdf
polyvinylidene fluoride
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410381329.7A
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Chinese (zh)
Inventor
龚明
林斯辉
李强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGXI CHANG HE NEW BATTERY CO Ltd
Original Assignee
JIANGXI CHANG HE NEW BATTERY CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JIANGXI CHANG HE NEW BATTERY CO Ltd filed Critical JIANGXI CHANG HE NEW BATTERY CO Ltd
Priority to CN201410381329.7A priority Critical patent/CN104218217A/en
Publication of CN104218217A publication Critical patent/CN104218217A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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
    • H01M4/623—Binders being polymers fluorinated polymers
    • 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
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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 relates to a power battery lithium ion secondary battery pole piece which includes an anode pole piece and a cathode pole piece. The anode pole piece is manufactured from 88.0-94.0% of lithium iron phosphate, 3.5-5.5% of acetylene black (SP, with a particle size being 40-45 nm), 1.0-3.0% of V7 (carbon nano tubes), 1.0-3.0% of VGCF (carbon nano fibers), and 3.5-5.5% of PVDF (polyvinylidene fluoride). The cathode pole piece is manufactured from 88.0-90.0% of graphite, 2.0-4.0% of acetylene black (SP, with a particle size being 40-45 nm), 2.0-4.0% of acetylene black B (SP, with a particle size being 46-50 nm), 0.005-0.015% of oxalic acid (ethanedioic acid) and 3.5-5.5% of PVDF (polyvinylidene fluoride). According to selection of a material system and a formula optimizing experiment, a battery, which is excellent in manufacturing performance, high in circulating performance and high in rate performance, is developed.

Description

A kind of power-type lithium ion pole piece thereof
Technical field
The present invention relates to a kind of power-type lithium ion pole piece thereof, belong to field of lithium.
Background technology
Power-type lithium ion secondary cell is widely used in electric bicycle, electric automobile, the fields such as power tool, demand is huge, be the safety of secondary battery energy of main positive electrode at present with LiFePO4, high rate performance is best, obviously be better than cobalt acid lithium, mangaic acid iron lithium and ternary material lithium battery, simultaneously, the required element of ferric phosphate lithium cell is all earth rich content, therefore be employed very soon as electrokinetic cell, existing domestic to also fewer as the research of positive electrode using LiFePO4, the ratio of each component of pole piece does not pass through the optimization of series, there is high rate performance difference, the problem that in poor radiation and processing procedure, the adhesion of pole piece is bad.
Summary of the invention
Object of the present invention aims to provide a kind of power-type lithium ion pole piece thereof, has the pole piece formula of high rate capability, improve in the industry in power-type lithium ion battery processing procedure manufacturing poor, the problem that battery core high rate performance, security performance are bad.
For achieving the above object, a kind of power-type lithium ion pole piece thereof of the present invention, be divided into anode pole piece and cathode pole piece, anode pole piece is by LiFePO4 88.0% ~ 94.0%, acetylene black (SP, particle diameter is 40-45nm) 3.5% ~ 5.5%, V7 (carbon nano-tube) 1.0% ~ 3.0%, VGCF (carbon nano-fiber) 1.0% ~ 3.0%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated, cathode pole piece is by graphite 88.0% ~ 90.0%, acetylene black (SP, particle diameter is 40-45nm) 2.0% ~ 4.0%, acetylene black B (SP, particle diameter 46-50nm) 2.0% ~ 4.0%, oxalic acid (ethanedioic acid) 0.005% ~ 0.015%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated.
A kind of power-type lithium ion pole piece thereof of the present invention compared with prior art has following excellent effect:
Anode formula design of the present invention, with the addition of the conductive agent of two kinds of high conductivity, optimize the ratio of conductive agent, binding agent and active material simultaneously, when equal positive active material content, reduce the internal resistance of battery core, improve conductivity and the thermal diffusivity of battery core, and then improve high rate performance and the security performance of battery core.
Cathode formula design of the present invention, add a kind of additive, optimize the ratio of conductive agent, binding agent simultaneously, when equal negative electrode active material content, enhance the adhesion of cathode pole piece, there will not be to fall the phenomenon of material in film-making and winding process, improve battery core manufacturing and fail safe, positive plate batching adopts oiliness formula, can improve the cycle performance of battery.
Embodiment
Below power-type lithium ion pole piece thereof of the present invention is described in further detail.
Power-type lithium ion pole piece thereof of the present invention is divided into anode pole piece and cathode pole piece, anode pole piece is by LiFePO4 LiFePO4 88.0% ~ 94.0%, acetylene black (SP, particle diameter is 40-45nm) 3.5% ~ 5.5%, V7 (carbon nano-tube) 1.0% ~ 3.0%, VGCF (carbon nano-fiber) 1.0% ~ 3.0%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated, cathode pole piece is by graphite 88.0% ~ 90.0%, acetylene black (SP, particle diameter is 40-45nm) 2.0% ~ 4.0%, acetylene black B (SP, particle diameter 46-50nm) 2.0% ~ 4.0%, oxalic acid (ethanedioic acid) 0.005% ~ 0.015%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated.
Power-type lithium ion pole piece thereof of the present invention is divided into anode pole piece and cathode pole piece, the outfit of anode pole piece and cathode pole piece is mass percent, get the raw materials ready by formulation ratio of the present invention, production technology is manufactured routinely, then spreads upon respectively on anode pole piece and cathode pole piece.
Pole piece manufacturing process comprises two parts: blending process and coating procedure.
Blending process:
Positive plate is prepared burden: describe whipping process and procedure parameter control,
1. the PVDF (polyvinylidene fluoride) first adding nmp solvent and 3.5% ~ 5.5% ratio makes glue, and require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
2. test gelatin viscosity with viscosimeter;
3. add the V7 (carbon nano-tube) of 1.0% ~ 3.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
4. add the VGCF (carbon nano-fiber) of 1.0% ~ 3.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
5. add the acetylene black of 3.5% ~ 5.5% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
6. add the LiFePO4 of 88.0% ~ 94.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 2h;
7., by viscosimeter testing size viscosity, range of viscosities 1500-6000mPa.s, if viscosity is not in scope, adds NMP and regulates;
8. as slurry viscosity in claimed range then slurry sieve and proceed to coating operation, be applied on the aluminium foil of 10-30um, baking is dry, baking temperature 65-130 DEG C, namely becomes positive plate after baking is dry.
Negative plate is prepared burden: describe whipping process and procedure parameter control, (NMP is solvent)
1. the PVDF (polyvinylidene fluoride) first adding nmp solvent and 3.5% ~ 5.5% ratio makes glue, and require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
2. test gelatin viscosity with viscosimeter;
3. add the acetylene black of 2.0% ~ 4.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
4. add the acetylene black B of 2.0% ~ 4.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
5. add the graphite of 88.0% ~ 90.0% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 2h;
6. add the oxalic acid (ethanedioic acid) of 0.005% ~ 0.015% ratio, require that whisking machines revolution rotating speed is: 15-45rpm, rotation rotating speed is: 800-2000rpm, and the time is: 1h;
7., by viscosimeter testing size viscosity, range of viscosities 1500-6000mPa.s, if viscosity is not in scope, adds NMP and regulates;
8. as slurry viscosity in claimed range then slurry sieve and proceed to coating operation, be applied on the aluminium foil of 10-30um, baking is dry, baking temperature 65-130 DEG C, namely becomes positive plate after baking is dry.
Acetylene black decomposes the acetylene of the refining purity more than 99% obtained by manufacture gas when calcium carbide route or naphtha (raw gasoline) pyrolysis, the carbon black obtained after continuous pyrolysis.

Claims (1)

1. a power-type lithium ion pole piece thereof, be divided into anode pole piece and cathode pole piece, it is characterized in that anode pole piece is by LiFePO4 LiFePO4 88.0% ~ 94.0%, acetylene black (SP, particle diameter is 40-45nm) 3.5% ~ 5.5%, V7 (carbon nano-tube) 1.0% ~ 3.0%, VGCF (carbon nano-fiber) 1.0% ~ 3.0%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated, cathode pole piece is by graphite 88.0% ~ 90.0%, acetylene black (SP, particle diameter is 40-45nm) 2.0% ~ 4.0%, acetylene black B (SP, particle diameter 46-50nm) 2.0% ~ 4.0%, oxalic acid (ethanedioic acid) 0.005% ~ 0.015%, PVDF (polyvinylidene fluoride) 3.5% ~ 5.5% is formulated.
CN201410381329.7A 2014-07-29 2014-07-29 Power battery lithium ion secondary battery pole piece Pending CN104218217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410381329.7A CN104218217A (en) 2014-07-29 2014-07-29 Power battery lithium ion secondary battery pole piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410381329.7A CN104218217A (en) 2014-07-29 2014-07-29 Power battery lithium ion secondary battery pole piece

Publications (1)

Publication Number Publication Date
CN104218217A true CN104218217A (en) 2014-12-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900844A (en) * 2015-06-18 2015-09-09 田东 Cathode slurry for lithium-ion batteries and preparation method of cathode slurry

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1918731A (en) * 2004-02-07 2007-02-21 株式会社Lg化学 Electrode additives coated with electro conductive material and lithium secondary comprising the same
JP2008243529A (en) * 2007-03-27 2008-10-09 Hitachi Vehicle Energy Ltd Positive electrode for lithium ion secondary battery, and lithium ion secondary battery
CN103715452A (en) * 2013-12-19 2014-04-09 山东威能环保电源有限公司 Low-temperature lithium iron phosphate lithium-ion power battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1918731A (en) * 2004-02-07 2007-02-21 株式会社Lg化学 Electrode additives coated with electro conductive material and lithium secondary comprising the same
JP2008243529A (en) * 2007-03-27 2008-10-09 Hitachi Vehicle Energy Ltd Positive electrode for lithium ion secondary battery, and lithium ion secondary battery
CN103715452A (en) * 2013-12-19 2014-04-09 山东威能环保电源有限公司 Low-temperature lithium iron phosphate lithium-ion power battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900844A (en) * 2015-06-18 2015-09-09 田东 Cathode slurry for lithium-ion batteries and preparation method of cathode slurry
WO2016202168A1 (en) * 2015-06-18 2016-12-22 田东 Lithium-ion battery positive-electrode slurry and preparation method therefor

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Application publication date: 20141217