CN103606707B - A kind of method improving lithium ion battery chemical property - Google Patents
A kind of method improving lithium ion battery chemical property Download PDFInfo
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- CN103606707B CN103606707B CN201310653330.6A CN201310653330A CN103606707B CN 103606707 B CN103606707 B CN 103606707B CN 201310653330 A CN201310653330 A CN 201310653330A CN 103606707 B CN103606707 B CN 103606707B
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- negative material
- softex
- lithium ion
- ion battery
- dimethyl carbonate
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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
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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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of method improving lithium ion battery chemical property.The method comprises use softex kw and improves lithium ion battery negative material, to improve its electrochemistry cycle performance.By controlling the soak time of softex kw, effectively can regulate and control the stable circulation performance of lithium ion battery.Preparation method of the present invention is simple, by using softex kw to improve lithium ion battery core negative material, improves its stable circulation performance and rate capability significantly.Test result shows: under current density is 800 milliamperes/gram, after 100 cycle charge-discharges, and the negative material capacity through softex kw process rises to 113 MAhs/g by untreated 92 MAhs/g.
Description
Technical field
The invention belongs to field of lithium ion battery, relate to a kind of method utilizing softex kw to improve lithium ion battery chemical property.
Background technology
As the various binary oxides of 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, but such material one obviously shortcoming be that often self-conductive is poor for these materials, at present, the main method of domestic and international employing is included in oxide surface and is coated with carbon, adulterates or the carbon nano-tube of oxide and conduction or reduced graphene etc. are formed composite construction effectively to play its excellent chemical property to oxide.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 often more complicated and there is high cost.Softex kw is used widely in a lot of field as a kind of conventional cationic surfactant, but the method utilizing softex kw directly to improve the chemical property of lithium ion battery have not been reported.The present invention's key make use of softex kw carbon residual after thermal decomposition to be at low temperatures coated on titanium dioxide nanocrystalline surface and to form conductive layer.The key of technology is titanium dioxide nanocrystalline bubble inside the ethanolic solution of softex kw, and titanium dioxide nanocrystalline surface is fully contacted with solution.
Summary of the invention
The object of the invention is to provide a kind of method improving lithium ion battery chemical property to solve the problem, the method uses softex kw to improve lithium ion battery negative material, improves its chemical property significantly.
Concrete steps are:
(1) titanium dioxide of 0.5-4 gram nanocrystalline is joined 20-200 ml volumes than in the mixed solution for 1-2:4-8 acetic acid and absolute ethyl alcohol, fully stir obtained slurry, and within 1-3 hour, obtain negative material to be deposited in the drying of 50-100 degree.
(2) negative material to be deposited for step (1) gained being immersed concentration is in the ethanol solution of the softex kw of 0.5-2 mM/l, soak time is 1-10 hour, obtains the negative material of the nucleocapsid structure of superficial growth thin layer softex kw.
(3) negative material of step (2) gained nucleocapsid structure under 400-500 degree after heat treatment 3-5 hour, is cooled for subsequent use in Muffle furnace.
(4) take negative material and the 10% poly-inclined tetrafluoroethene of 90% step (3) gained nucleocapsid structure in mass ratio, be placed in small beaker mix and blend 4-8 hour, obtain the electrode slurry mixed; Be spread evenly across on aluminium foil by slurry, and dry 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) transferred to immediately in the glove box being full of argon atmosphere by electrode slice dried for step (4) and assemble 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), adopts polypropylene diaphragm, makes CR2016 type button cell, for preventing button cell interior contact bad, adds foaming nickel sheet as filler.
Described acetic acid, poly-inclined tetrafluoroethene, dimethyl carbonate and dimethyl carbonate be analyze pure.
Preparation method of the present invention is simple, by using softex kw to improve lithium ion battery core negative material, improves its stable circulation performance and rate capability significantly.Test result shows: under current density is 800 milliamperes/gram, after 100 cycle charge-discharges, and the negative material capacity through softex kw process 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 titanium dioxide nanocrystalline before and after softex kw.
Fig. 2 is the field emission scanning electron microscope figure of titanium dioxide nanocrystalline after the lithium ion battery negative material immersion softex kw of the embodiment of the present invention 1.
Fig. 3 is the high resolution electron microscopy figure of titanium dioxide nanocrystalline after the lithium ion battery negative material immersion softex kw of the embodiment of the present invention 1.
Fig. 4 is the Capacity Plan of lithium ion battery when current density is 800 milliamperes/gram of the embodiment of the present invention 1.
Embodiment
embodiment 1:
(1) by the mixed solution of the nanocrystalline 40 milliliters of absolute ethyl alcohols joining 10 milliliters of acetic acid of the titanium dioxide of 1 gram, fully stir obtained slurry, and within 2 hours, obtain negative material to be deposited in 80 degree of dryings.
(2) negative material to be deposited for step (1) being immersed concentration is in the ethanol solution of the softex kw of 0.5 mM/l, soak time is 5 hours, obtains the negative material of the nucleocapsid structure of superficial growth thin layer softex kw.
(3) by the negative material of step (2) gained nucleocapsid structure in Muffle furnace under 400 degree heat treatment after 5 hours, cool for subsequent use.
(4) take negative material and the 10% poly-inclined tetrafluoroethene of 90% step (3) gained nucleocapsid structure in mass ratio, be placed in small beaker mix and blend 8 hours, obtain the electrode slurry mixed; Be spread evenly across on aluminium foil by slurry, and dry in 60 degree of 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) transferred to immediately in the glove box being full of argon atmosphere by electrode slice dried for step (4) and assemble 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 button cell interior contact bad, add foaming nickel sheet as filler.
Described acetic acid, poly-inclined tetrafluoroethene, dimethyl carbonate and dimethyl carbonate be analyze pure.
embodiment 2:
(1) by the mixed solution of the nanocrystalline 160 milliliters of absolute ethyl alcohols joining 40 milliliters of acetic acid of the titanium dioxide of 4 grams, fully stir obtained slurry, and within 3 hours, obtain negative material to be deposited in 100 degree of dryings.
(2) negative material to be deposited for step (1) being immersed concentration is in the ethanol solution of the softex kw of 2 mM/ls, soak time is 10 hours, obtains the negative material of the nucleocapsid structure of superficial growth thin layer softex kw.
(3) by the negative material of step (2) gained nucleocapsid structure in Muffle furnace under 500 degree heat treatment after 3 hours, cool for subsequent use.
(4) take negative material and the 10% poly-inclined tetrafluoroethene of 90% step (3) gained nucleocapsid structure in mass ratio, be placed in small beaker mix and blend 4 hours, obtain the electrode slurry mixed; Be spread evenly across on aluminium foil by slurry, and dry in 80 degree of 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) transferred to immediately in the glove box being full of argon atmosphere by electrode slice dried for step (4) and assemble 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 button cell interior contact bad, add foaming nickel sheet as filler.
Described acetic acid, poly-inclined tetrafluoroethene, dimethyl carbonate and dimethyl carbonate be analyze pure.
Claims (1)
1. improve a method for lithium ion battery chemical property, it is characterized in that concrete steps are:
(1) titanium dioxide of 0.5-4 gram nanocrystalline is joined 20-200 ml volumes than in the mixed solution for 1-2:4-8 acetic acid and absolute ethyl alcohol, fully stir obtained slurry, and obtain negative material to be deposited in 50-100 degree Celsius of dry 1-3 hour;
(2) negative material to be deposited for step (1) gained being immersed concentration is in the ethanol solution of the softex kw of 0.5-2 mM/l; soak time is 1-10 hour, obtains the negative material of the nucleocapsid structure of superficial growth thin layer softex kw;
(3) by the negative material of step (2) gained nucleocapsid structure in Muffle furnace 400-500 degree Celsius after lower heat treatment 3-5 hour, cool for subsequent use;
(4) take negative material and the 10% poly-inclined tetrafluoroethene of 90% step (3) gained nucleocapsid structure in mass ratio, be placed in small beaker mix and blend 4-8 hour, obtain the electrode slurry mixed; Be spread evenly across on aluminium foil by slurry, and dry in 60-80 degree Celsius of 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 at one hundred and twenty degrees centigrade;
(5) transferred to immediately in the glove box being full of argon atmosphere by electrode slice dried for step (4) and assemble battery, metal lithium sheet is as to electrode, and electrolyte is 1 mol/L LiPF
6/ ethylene carbonate and EC: dimethyl carbonate and DMC, LiPF
6/ ethylene carbonate and dimethyl carbonate volume ratio are 1:1, adopt polypropylene diaphragm, make CR2016 type button cell, for preventing button cell interior contact bad, add foaming nickel sheet as filler;
Described acetic acid, poly-inclined tetrafluoroethene, dimethyl carbonate and dimethyl carbonate be analyze pure.
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| CN201310653330.6A CN103606707B (en) | 2013-12-03 | 2013-12-03 | A kind of method improving lithium ion battery chemical property |
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| CN103606707B true CN103606707B (en) | 2015-09-23 |
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Citations (5)
| 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 |
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Patent Citations (5)
| 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 |
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