CN103606707A - Method for improving electrochemical properties of lithium ion battery - Google Patents

Method for improving electrochemical properties of lithium ion battery Download PDF

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Publication number
CN103606707A
CN103606707A CN201310653330.6A CN201310653330A CN103606707A CN 103606707 A CN103606707 A CN 103606707A CN 201310653330 A CN201310653330 A CN 201310653330A CN 103606707 A CN103606707 A CN 103606707A
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negative material
lithium ion
ion battery
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dried
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CN201310653330.6A
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CN103606707B (en
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王海
王辛瑜
王林江
方亮
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Suzhou yifanghua Intellectual Property Operation Co., Ltd
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Guilin University of 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a method for improving the electrochemical properties of a lithium ion battery. The method includes using cetyl trimethyl ammonium bromide to improve a lithium ion battery cathode material so as to enhance its electrochemical cycle performance. By controlling the soaking time of cetyl trimethyl ammonium bromide, the cyclic stability of the lithium ion battery can be effectively controlled. According to the invention, the preparation method is simple, cetyl trimethyl ammonium bromide is employed to improve the lithium ion battery cathode material, and the cycling stability and rate performance are significantly improved. Test results show that: under a current density of 800mA/g, and after 100 times of cyclic charge-discharge, the capacity of the cathode material treated by cetyl trimethyl ammonium bromide is increased to 113mAh/g from 92mAh/g of an untreated cathode material.

Description

A kind of method of improving lithium ion battery chemical property
Technical field
The invention belongs to lithium ion battery field, relate to a kind of method of utilizing softex kw to improve lithium ion battery chemical property.
Background technology
Various binary oxides as lithium ion battery negative material, as titanium dioxide, tin ash, although di-iron trioxides etc. have outstanding stable circulation performance and rate capability than business-like material with carbon element, yet very obvious shortcoming of such material is that often self-conductive is poor for these materials, at present, the main method adopting is both at home and abroad included in oxide surface and is coated with carbon, and oxide is adulterated or the formation composite constructions such as the carbon nano-tube of oxide and conduction or reduced graphene could effectively be brought into play to its good chemical property.These techniques are difficult to form desirable clad structure on the one hand, as being coated with carbon technique; On the other hand, these techniques more complicated and have high cost often.Softex kw is used widely in a lot of fields as a kind of conventional cationic surfactant, but the method for utilizing softex kw directly to improve the chemical property of lithium ion battery have not been reported.Key of the present invention be utilized softex kw at low temperatures after thermal decomposition residual carbon be coated on titanium dioxide nanocrystalline surface and form conductive layer.The key of technology is the ethanolic solution the inside at softex kw by titanium dioxide nanocrystalline bubble, and titanium dioxide nanocrystalline surface is fully contacted with solution.
Summary of the invention
The object of the invention is for a kind of method of improving lithium ion battery chemical property that provides is provided, the method is used softex kw to improve lithium ion battery negative material, has improved significantly its chemical property.
Concrete steps are:
(1) the nanocrystalline of the titanium dioxide of 0.5-4 gram joined to 20-200 ml volumes than being in the mixed solution of 1-2:4-8 acetic acid and absolute ethyl alcohol, fully stir and make slurry, and be dried and within 1-3 hour, obtain negative material to be deposited in 50-100 degree.
(2) step (1) gained negative material to be deposited being immersed to concentration is in the ethanol solution of softex kw of 0.5-2 mM/l, soak time is 1-10 hour, the negative material of nucleocapsid structure of thin layer softex kw that obtained superficial growth.
(3) by the negative material of step (2) gained nucleocapsid structure in Muffle furnace under 400-500 degree after heat treatment 3-5 hour, cooling standby.
(4) take in mass ratio negative material and the 10% poly-inclined to one side tetrafluoroethene of 90% step (3) gained nucleocapsid structure, be placed in small beaker mix and blend 4-8 hour, obtain the electrode slurry mixing; Slurry is evenly coated on aluminium foil, and dried in 60-80 degree baking oven, dried pole piece is through compressing tablet, die-cut, and making diameter is 14 millimeters of disks, by electrode slice vacuumize 12 hours under 120 degree.
(5) the dried electrode slice of step (4) is transferred to immediately in the glove box that is full of argon shield atmosphere and assembled battery, metal lithium sheet is as to electrode, and electrolyte is 1 mol/L LiPF 6/ ethylene carbonate (EC): dimethyl carbonate (DMC) (volume ratio is 1:1), adopt polypropylene diaphragm, make CR2016 type button cell, for preventing the inner loose contact of button cell, add Foamed Nickel sheet as filler.
It is pure that described acetic acid, poly-inclined to one side tetrafluoroethene, dimethyl carbonate and dimethyl carbonate are analysis.
Preparation method of the present invention is simple, by using softex kw to improve lithium ion battery core negative material, has improved significantly its stable circulation performance and rate capability.Test result shows: in current density, be under 800 milliamperes/gram, after 100 cycle charge-discharges, the negative material capacity of processing through softex kw rises to 113 MAhs/g by untreated 92 MAhs/g.
accompanying drawing explanation:
Fig. 1 is the X-ray diffraction comparison diagram that the lithium ion battery negative material of the embodiment of the present invention 1 soaks softex kw front and back titanium dioxide nanocrystalline.
Fig. 2 is the field emission scanning electron microscope figure that the lithium ion battery negative material of the embodiment of the present invention 1 soaks titanium dioxide nanocrystalline after softex kw.
Fig. 3 is the high resolution electron microscopy figure that the lithium ion battery negative material of the embodiment of the present invention 1 soaks titanium dioxide nanocrystalline after softex kw.
Fig. 4 is the lithium ion battery of the embodiment of the present invention 1 Capacity Plan when current density is 800 milliamperes/gram.
Embodiment
embodiment 1:
(1) titanium dioxide of 1 gram nanocrystalline joined in the mixed solution of 40 milliliters of absolute ethyl alcohols of 10 milliliters of acetic acid, fully stir and make slurry, and within 2 hours, obtain negative material to be deposited in 80 degree are dry.
(2) step (1) negative material to be deposited being immersed to concentration is in the ethanol solution of softex kw of 0.5 mM/l, soak time is 5 hours, the negative material of nucleocapsid structure of thin layer softex kw that obtained superficial growth.
(3) by the heat treatment after 5 hours under 400 degree in Muffle furnace of the negative material of step (2) gained nucleocapsid structure, cooling standby.
(4) take in mass ratio negative material and the 10% poly-inclined to one side tetrafluoroethene of 90% step (3) gained nucleocapsid structure, be placed in small beaker mix and blend 8 hours, obtain the electrode slurry mixing; Slurry is evenly coated on aluminium foil, and dried in 60 degree baking ovens, dried pole piece is through compressing tablet, die-cut, and making diameter is 14 millimeters of disks, by electrode slice vacuumize 12 hours under 120 degree.
(5) the dried electrode slice of step (4) is transferred to immediately in the glove box that is full of argon shield atmosphere and assembled battery, metal lithium sheet is as to electrode, and electrolyte is 1 mol/L LiPF 6/ ethylene carbonate (EC): dimethyl carbonate (DMC) (1:1, volume ratio), i.e. LiPF 6/ ethylene carbonate and dimethyl carbonate volume ratio are 1:1, adopt polypropylene diaphragm, make CR2016 type button cell; For preventing the inner loose contact of button cell, add Foamed Nickel sheet as filler.
It is pure that described acetic acid, poly-inclined to one side tetrafluoroethene, dimethyl carbonate and dimethyl carbonate are analysis.
embodiment 2:
(1) titanium dioxide of 4 grams nanocrystalline joined in the mixed solution of 160 milliliters of absolute ethyl alcohols of 40 milliliters of acetic acid, fully stir and make slurry, and within 3 hours, obtain negative material to be deposited in 100 degree are dry.
(2) step (1) negative material to be deposited being immersed to concentration is in the ethanol solution of softex kw of 2 mM/ls, soak time is 10 hours, the negative material of nucleocapsid structure of thin layer softex kw that obtained superficial growth.
(3) by the heat treatment after 3 hours under 500 degree in Muffle furnace of the negative material of step (2) gained nucleocapsid structure, cooling standby.
(4) take in mass ratio negative material and the 10% poly-inclined to one side tetrafluoroethene of 90% step (3) gained nucleocapsid structure, be placed in small beaker mix and blend 4 hours, obtain the electrode slurry mixing; Slurry is evenly coated on aluminium foil, and dried in 80 degree baking ovens, dried pole piece is through compressing tablet, die-cut, and making diameter is 14 millimeters of disks, by electrode slice vacuumize 12 hours under 120 degree.
(5) the dried electrode slice of step (4) is transferred to immediately in the glove box that is full of argon shield atmosphere and assembled battery, metal lithium sheet is as to electrode, and electrolyte is 1 mol/L LiPF 6/ ethylene carbonate (EC): dimethyl carbonate (DMC) (1:1, volume ratio), i.e. LiPF 6/ ethylene carbonate and dimethyl carbonate volume ratio are 1:1, adopt polypropylene diaphragm, make CR2016 type button cell; For preventing the inner loose contact of button cell, add Foamed Nickel sheet as filler.
It is pure that described acetic acid, poly-inclined to one side tetrafluoroethene, dimethyl carbonate and dimethyl carbonate are analysis.

Claims (1)

1. improve a method for lithium ion battery chemical property, it is characterized in that concrete steps are:
(1) the nanocrystalline of the titanium dioxide of 0.5-4 gram joined to 20-200 ml volumes than being in the mixed solution of 1-2:4-8 acetic acid and absolute ethyl alcohol, fully stir and make slurry, and be dried and within 1-3 hour, obtain negative material to be deposited in 50-100 degree;
(2) step (1) gained negative material to be deposited being immersed to concentration is in the ethanol solution of softex kw of 0.5-2 mM/l; soak time is 1-10 hour, the negative material of nucleocapsid structure of thin layer softex kw that obtained superficial growth;
(3) by the negative material of step (2) gained nucleocapsid structure in Muffle furnace under 400-500 degree after heat treatment 3-5 hour, cooling standby;
(4) take in mass ratio negative material and the 10% poly-inclined to one side tetrafluoroethene of 90% step (3) gained nucleocapsid structure, be placed in small beaker mix and blend 4-8 hour, obtain the electrode slurry mixing; Slurry is evenly coated on aluminium foil, and dried in 60-80 degree baking oven, dried pole piece is through compressing tablet, die-cut, and making diameter is 14 millimeters of disks, by electrode slice vacuumize 12 hours under 120 degree;
(5) the dried electrode slice of step (4) is transferred to immediately in the glove box that is full of argon shield atmosphere and assembled battery, metal lithium sheet is as to electrode, and electrolyte is 1 mol/L LiPF 6/ ethylene carbonate is EC: dimethyl carbonate is DMC, LiPF 6/ ethylene carbonate and dimethyl carbonate volume ratio are 1:1, adopt polypropylene diaphragm, make CR2016 type button cell, for preventing the inner loose contact of button cell, add Foamed Nickel sheet as filler;
It is pure that described acetic acid, poly-inclined to one side tetrafluoroethene, dimethyl carbonate and dimethyl carbonate are analysis.
CN201310653330.6A 2013-12-03 2013-12-03 A kind of method improving lithium ion battery chemical property Active CN103606707B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110994031A (en) * 2019-12-19 2020-04-10 湖南美尼科技有限公司 Fast-charging high-temperature-resistant electrolyte and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102148351A (en) * 2010-02-06 2011-08-10 清华大学 Preparation method for electrode material of lithium battery
CN102315430A (en) * 2011-10-21 2012-01-11 佛山市邦普循环科技有限公司 Preparation method for metallic oxide cladded anode material of lithium ion battery
CN102593444A (en) * 2012-01-17 2012-07-18 东莞市迈科科技有限公司 Preparation method of carbon-coated lithium titanate and product of carbon-coated lithium titanate
CN102666390A (en) * 2009-11-05 2012-09-12 新加坡国立大学 Crystalline mesoporous titanium dioxide and the use thereof in electrochemical devices
CN102769123A (en) * 2011-05-03 2012-11-07 北京化工大学 Preparation method of titanium dioxide/carbon composite lithium battery electrode material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102666390A (en) * 2009-11-05 2012-09-12 新加坡国立大学 Crystalline mesoporous titanium dioxide and the use thereof in electrochemical devices
CN102148351A (en) * 2010-02-06 2011-08-10 清华大学 Preparation method for electrode material of lithium battery
CN102769123A (en) * 2011-05-03 2012-11-07 北京化工大学 Preparation method of titanium dioxide/carbon composite lithium battery electrode material
CN102315430A (en) * 2011-10-21 2012-01-11 佛山市邦普循环科技有限公司 Preparation method for metallic oxide cladded anode material of lithium ion battery
CN102593444A (en) * 2012-01-17 2012-07-18 东莞市迈科科技有限公司 Preparation method of carbon-coated lithium titanate and product of carbon-coated lithium titanate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110994031A (en) * 2019-12-19 2020-04-10 湖南美尼科技有限公司 Fast-charging high-temperature-resistant electrolyte and preparation method thereof

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