CN105047887A - Method for improving silicon cathode material of lithium ion battery - Google Patents
Method for improving silicon cathode material of lithium ion battery Download PDFInfo
- Publication number
- CN105047887A CN105047887A CN201510344957.2A CN201510344957A CN105047887A CN 105047887 A CN105047887 A CN 105047887A CN 201510344957 A CN201510344957 A CN 201510344957A CN 105047887 A CN105047887 A CN 105047887A
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- cathode material
- lithium ion
- ion battery
- lignin
- acid solution
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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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
Abstract
The invention relates to a method for improving a silicon cathode material of a lithium ion battery. The method comprises the following steps: (a) dissolving phytic acid into deionized water to form a phytic acid solution; (b) dispersing lignin into the phytic acid solution to form a suspension; and (c) dispersing silicon powder into the suspension, performing ultrasonic treatment. The performance of the silicon cathode material can be improved creatively with the lignin, and ultrasonic waves act on the lignin and the silicon powder, so that the dispersion of substances can be accelerated; time is shortened; and the efficiency is increased. On the other hand, a solid electrolyte interface (SEI) film is formed in charging and discharging processes under the actions of the lignin and the silicon powder, so that the performance of commercial silicon powder is improved greatly. Moreover, the method is simple and feasible, and suitable for large-scale popularization.
Description
Technical field
The invention belongs to field of nano material preparation, relate to a kind of ameliorative way of negative material, be specifically related to a kind of method improving lithium ion battery silicon cathode material.
Background technology
Energy crisis is day by day serious, therefore, day by day urgent to the demand of the new forms of energy of environmental protection.And lithium ion battery is more and more subject to people's attention as a kind of new forms of energy of environmental protection.The high new type lithium ion battery of Large Copacity, long-life, fail safe becomes the target that people pursue.
Silicon materials have higher capacity (theoretical specific capacity 4200mAh/g), are one of lithium ion battery negative materials of future generation of most potentiality, thus receive the very big concern of researcher.But in cyclic process, silicon exists huge bulk effect, easily causes material structure avalanche and efflorescence, causes electric pole short circuit, irreversible capacity is large, and cyclical stability is poor.At present, the measure improving silicium cathode material property mainly comprises: material nano, Composite and structure particularization etc.There is the shortcoming that cost is higher, be difficult to extensive use in the measure of above-mentioned raising silicium cathode material property.
Summary of the invention
The present invention seeks to provide a kind of method improving lithium ion battery silicon cathode material to overcome the deficiencies in the prior art.
For solving above technical problem, a kind of technical scheme that the present invention takes is: a kind of method improving lithium ion battery silicon cathode material, and it is characterized in that, it comprises the following steps:
A phytic acid is dissolved in deionized water and forms plant acid solution by ();
B lignin is scattered in described plant acid solution and forms suspension-turbid liquid by ();
C silica flour is scattered in described suspension-turbid liquid by (), ultrasonic.
Optimally, the concentration of described plant acid solution is 10 ~ 50mmol/L.
Optimally, in described step (b), described lignin is added and within described plant acid solution ultrasonic 1 ~ 5 minute, carries out dispersion formation suspension-turbid liquid.
Optimally, described silica flour is made up of the silicon ball of particle diameter >=50nm.
Further, the mass ratio of described lignin and described silica flour is 1:2 ~ 4.
Further, described ultrasonic temperature is 0 ~ 30 DEG C, the time is 2 ~ 5 hours.
Because technique scheme is used, the present invention compared with prior art has following advantages: the present invention improves the method for lithium ion battery silicon cathode material, lignin is creatively used to improve the performance of silicium cathode material, utilize ultrasonic wave to act on lignin and silica flour on the one hand, the dispersion of material, shortening time can be accelerated, raise the efficiency; Utilize the effect of lignin and silica flour on the other hand, in charge and discharge process, form solid electrolyte interface film (SEI film), greatly improve the performance of business silica flour, and the method is simple, is suitable for large-scale promotion.
Accompanying drawing explanation
Accompanying drawing 1 is the chemical property figure recorded after lithium ion battery silicon cathode material obtained in embodiment 1 is assembled into lithium ion battery;
Accompanying drawing 2 is the chemical property figure recorded after lithium ion battery silicon cathode material obtained in embodiment 2 is assembled into lithium ion battery;
Accompanying drawing 3 is the chemical property figure recorded after lithium ion battery silicon cathode material obtained in embodiment 3 is assembled into lithium ion battery;
Accompanying drawing 4 is the chemical property figure recorded after commercially available business silica flour is assembled into lithium ion battery.
Embodiment
The present invention improves the method for lithium ion battery silicon cathode material, and it comprises the following steps: phytic acid is dissolved in deionized water and makes plant acid solution by (a); B lignin is scattered in described plant acid solution and forms suspension-turbid liquid by (); C silica flour is scattered in described suspension-turbid liquid by (), ultrasonic.Creatively use lignin to improve the performance of silicium cathode material, utilize ultrasonic wave to act on lignin and silica flour on the one hand, the dispersion of material, shortening time can be accelerated, raise the efficiency; Utilize the effect of lignin and silica flour on the other hand, in charge and discharge process, form solid electrolyte interface film (SEI film), greatly improve the performance of business silica flour, and the method is simple, is suitable for large-scale promotion; And using phytic acid to create beyond thought effect: it can make lignin and silica flour fully combine, and improves the chemical property of silicium cathode material.The concentration of plant acid solution is preferably 10 ~ 50mmol/L, and the too dense dispersion that can affect lignin of phytic acid concentration, too rare words then can not promote the combination of lignin and silica flour.In described step (b), described lignin is added and within described plant acid solution ultrasonic 1 ~ 5 minute, carries out dispersion formation suspension-turbid liquid, lignin is fully disperseed.Described silica flour is preferably made up of the silicon ball of particle diameter >=50nm, the spherical uniformity being conducive to silica flour and being combined with lignin, the final performance improving silicium cathode material.The mass ratio of described lignin and described silica flour is preferably 1:2 ~ 4, otherwise lignin crosses that I haven't seen you for ages causes silica flour performance improvement just can ignore not, and lignin is too much, then can affect the performance of lithium ion battery.Described ultrasonic temperature is 0 ~ 30 DEG C (preferred room temperature), the time is 2 ~ 5 hours.
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is described in detail:
Embodiment 1
The present embodiment provides a kind of method improving lithium ion battery silicon cathode material, and it comprises the following steps:
A phytic acid is dissolved in deionized water and forms the plant acid solution that concentration is 10mmol/L by ();
B 40mg lignin is scattered in 1.2mL plant acid solution by (), within ultrasonic 1 minute, carry out dispersion and form suspension-turbid liquid;
C 80mg silica flour (component is the silicon ball of average grain diameter 50 nanometer, and business silica flour is commercially available) is scattered in above-mentioned suspension-turbid liquid by (), under room temperature ultrasonic 3 hours.
D (), by Material coating on Copper Foil, dry, be washed into pole piece, be assembled into half-cell, test, test result as shown in Figure 1.
Embodiment 2
The present embodiment provides a kind of method improving lithium ion battery silicon cathode material, and it comprises the following steps:
A phytic acid is dissolved in deionized water and forms the plant acid solution that concentration is 50mmol/L by ();
B 50mg lignin adds in 2ml plant acid solution by (), within ultrasonic 5 minutes, carry out dispersion and form suspension-turbid liquid;
C 200mg silica flour (component is the silicon ball of average grain diameter 100 nanometer, and business silica flour is commercially available) is scattered in above-mentioned suspension-turbid liquid by (), ultrasonic 2 hours in 30 DEG C.
D (), by Material coating on Copper Foil, dry, be washed into pole piece, be assembled into half-cell, test, test result as shown in Figure 2.
Embodiment 3
The present embodiment provides a kind of method improving lithium ion battery silicon cathode material, and it comprises the following steps:
A phytic acid is dissolved in deionized water and forms the plant acid solution that concentration is 20mmol/L by ();
B 60mg lignin adds in 5ml plant acid solution by (), within ultrasonic 3 minutes, carry out dispersion and form suspension-turbid liquid;
C 180mg silica flour (component is the silicon ball of average grain diameter 150 nanometer, and business silica flour is commercially available) is scattered in above-mentioned suspension-turbid liquid by (), ultrasonic 5 hours in 0 DEG C;
D (), by Material coating on Copper Foil, dry, be washed into pole piece, be assembled into half-cell, test, test result as shown in Figure 3.
Experimental example 1
The silicium cathode material of preparation in embodiment 1 to 3 and commercially available business silica flour are made into electrode of lithium cell according to existing method respectively, and are assembled into lithium battery and carry out contrast test, its test result is listed in Fig. 1 to Fig. 4 respectively.As shown in Figure 4, commercially available business silica flour is after 50 charge and discharge cycles, and its capacity has been reduced to very little numerical value, and silicium cathode material prepared by the present invention is after 50 charge and discharge cycles, although its capacity reduces, the value reduced is less.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (6)
1. improve a method for lithium ion battery silicon cathode material, it is characterized in that, it comprises the following steps:
A phytic acid is dissolved in deionized water and forms plant acid solution by ();
B lignin is scattered in described plant acid solution and forms suspension-turbid liquid by ();
C silica flour is scattered in described suspension-turbid liquid by (), ultrasonic.
2. the method improving lithium ion battery silicon cathode material according to claim 1, is characterized in that: the concentration of described plant acid solution is 10 ~ 50mmol/L.
3. the method improving lithium ion battery silicon cathode material according to claim 1, is characterized in that: in described step (b), is added by described lignin and within described plant acid solution ultrasonic 1 ~ 5 minute, carries out dispersion formation suspension-turbid liquid.
4. the method improving lithium ion battery silicon cathode material according to claim 1, is characterized in that: described silica flour is made up of the silicon ball of particle diameter >=50nm.
5. the method improving lithium ion battery silicon cathode material according to claim 4, is characterized in that: the mass ratio of described lignin and described silica flour is 1:2 ~ 4.
6. the method improving lithium ion battery silicon cathode material according to claim 5, is characterized in that: described ultrasonic temperature is 0 ~ 30 DEG C, the time is 2 ~ 5 hours.
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| CN201510344957.2A CN105047887B (en) | 2015-06-19 | 2015-06-19 | A kind of method for improving lithium ion battery silicon cathode material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531992A (en) * | 2016-11-09 | 2017-03-22 | 南方科技大学 | Silicon-containing composite material and preparation method and application thereof |
| CN114467195A (en) * | 2019-10-09 | 2022-05-10 | 中国石油化工股份有限公司 | Negative electrode material, preparation method and application thereof, and lithium ion battery containing negative electrode material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359734A (en) * | 2003-12-19 | 2009-02-04 | 科诺科飞利浦公司 | Carbon-coated silicon particle power as the anode material for lithium batteries and the method of making the same |
| US20140038042A1 (en) * | 2012-08-06 | 2014-02-06 | Ut-Battelle, Llc | High capacity monolithic composite si/carbon fiber electrode architectures synthesized from low cost materials and process technologies |
| CN104058404A (en) * | 2013-03-19 | 2014-09-24 | 瓦克化学股份公司 | Si/C composites as anode materials for lithium ion batteries |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359734A (en) * | 2003-12-19 | 2009-02-04 | 科诺科飞利浦公司 | Carbon-coated silicon particle power as the anode material for lithium batteries and the method of making the same |
| US20140038042A1 (en) * | 2012-08-06 | 2014-02-06 | Ut-Battelle, Llc | High capacity monolithic composite si/carbon fiber electrode architectures synthesized from low cost materials and process technologies |
| CN104058404A (en) * | 2013-03-19 | 2014-09-24 | 瓦克化学股份公司 | Si/C composites as anode materials for lithium ion batteries |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531992A (en) * | 2016-11-09 | 2017-03-22 | 南方科技大学 | Silicon-containing composite material and preparation method and application thereof |
| CN106531992B (en) * | 2016-11-09 | 2019-08-20 | 南方科技大学 | A kind of composite material containing silicon and the preparation method and application thereof |
| CN114467195A (en) * | 2019-10-09 | 2022-05-10 | 中国石油化工股份有限公司 | Negative electrode material, preparation method and application thereof, and lithium ion battery containing negative electrode material |
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Effective date of registration: 20220728 Address after: 215000 F4, building 11, No. 2288, Wuzhong Avenue, Wuzhong Economic Development Zone, Suzhou, Jiangsu Province Patentee after: Suzhou Dega Energy Technology Co.,Ltd. Address before: 215123 No. 199 benevolence Road, Suzhou Industrial Park, Jiangsu, China Patentee before: SOOCHOW University |
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