CN110534743A - A kind of lithium ion battery negative material, cathode pole piece and button cell and preparation method thereof - Google Patents
A kind of lithium ion battery negative material, cathode pole piece and button cell and preparation method thereof Download PDFInfo
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- CN110534743A CN110534743A CN201910720992.8A CN201910720992A CN110534743A CN 110534743 A CN110534743 A CN 110534743A CN 201910720992 A CN201910720992 A CN 201910720992A CN 110534743 A CN110534743 A CN 110534743A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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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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- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
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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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- 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
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a kind of lithium ion battery negative material, cathode pole piece and button cells and preparation method thereof, the preparation method of the lithium ion battery negative material, include the following steps: graphene powder and source of iron presoma being mixed to form mixed solution in water, so that Fe is adhered on graphene surface layer3+；Nitrogenous three-dimensional porous framework material infiltration is ultrasonically treated in above-mentioned mixed solution；By treated, nitrogenous three-dimensional porous framework material is freeze-dried；Nitrogenous three-dimensional porous framework material after freeze-drying is heat-treated again.Lithium ion battery negative material conductivity is high in the present invention, and stability and safety are good, has superior cycle performance；Preparation process is simply easy to accomplish, pollution-free, has very high industrial value.
Description
Technical field
The present invention relates to a kind of lithium ion battery negative materials, more particularly to a kind of system of lithium ion battery negative material
Preparation Method.
Background technique
Lithium ion battery has that voltage platform is high as a kind of commercialized secondary cell, energy density it is big and
It is the advantages that good cycling stability, most potential in electrochmical power source and enjoy great popularity, play the part of in people's daily life at present
Drill key player, with all kinds of portable electronic devices and electric vehicle update iteration and energy storage field it is flourishing
Development, energy density and cycle life to lithium ion battery propose requirements at the higher level.The negative electrode material of battery is lithium ion battery
In key component, decisive role is played to chemical property.Current negative electrode material is mainly with carbon materials such as graphite
It is main.
Need to meet as negative electrode material claimed below, (1) negative electrode material possesses higher specific capacity；(2) possess higher
Electronic conductivity and ionic conductivity, be easy and lithium ion occur deintercalation reaction；(3) stable structure does not occur with electrolyte
Side reaction.The negative electrode material of present battery has certain limitation, so that battery cannot be considered in terms of height ratio capacity, high conductivity
And high safety performance.
And the special performance of graphene in material modification, is often being lost because reuniting using graphene.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of lithium ion battery negative materials
And its preparation method and application, for solving the problems of the prior art.
In order to achieve the above objects and other related objects, the present invention obtains by the following technical programs.
The present invention provides a kind of preparation method of lithium ion battery negative material, includes the following steps:
1) graphene powder and source of iron presoma are mixed to form mixed solution in water, so that graphene surface layer is adhered to
Fe3+；
2) nitrogenous three-dimensional porous framework material infiltration is ultrasonically treated in above-mentioned mixed solution；
3) by treated, nitrogenous three-dimensional porous framework material is freeze-dried,；
4) the nitrogenous three-dimensional porous framework material after freeze-drying is heat-treated again.
Fe when graphene powder is mixed with source of iron presoma, in source of iron presoma3+Self assembly is carried out on the surface of graphene,
To adhere on the surface of graphene.Various mixed medias can be used when mixing, it is preferable that in step 1), using ultrasonic mixing.
The size of graphene powder is unrestricted, but in order to preferably be convenient for Fe3+Self assembly and attachment, the graphite
Alkene is big size graphene, it is preferable that the graphene with a thickness of 0.2~0.7nm, 1 μ of graphene sheet layer diagonal length >
m.It is highly preferred that the big size graphene is to be prepared using electrochemical stripping method.
According to the application, as long as the source of iron presoma can provide Fe in water environment3+, other are unrestricted.
The present invention and its effect are realized to further facilitate, it is preferable that the source of iron presoma is selected from Fe (NO3)3·9H2O, Fe2
(CO3)3, FeCl3And Fe (OH)3One of or it is a variety of.
Technical solution according to the present invention, the nitrogenous three-dimensional porous framework material are used to be used as stone for providing nitrogen source
Black alkene and Fe3+Framework material.Preferably, the nitrogenous three-dimensional porous material is to use to include polyurethane and/or melamine
One or both of formed foamed material.
Technical solution according to the present invention, the temperature of freeze-drying are not higher than -5 DEG C.
Technical solution according to the present invention, the temperature of heat treatment are 450 DEG C~750 DEG C.Preferably, the time of heat treatment is 1h
~7h.By heat treatment so that nitrogenous three-dimensional porous framework material charing, to form N doping pyrolytic carbon, and coating-doping has
Fe3O4Graphene surface.
Technical solution according to the present invention, it is preferable that the heat treatment carries out under inert gas range, the inert gas
Including one of nitrogen, argon gas and helium or a variety of, preferably argon gas.
Technical solution according to the present invention promotes source of iron presoma to dissolve in water by addition aqueous solution of nitric acid.
The invention also discloses a kind of lithium ion battery negative materials prepared using preparation method as described above.
The invention also discloses a kind of lithium ion battery negative electrode, the lithium ion battery negative electrode includes using such as
The composite layer that lithium ion battery negative material described above is formed.
Preferably, the composite layer comprises the following components in parts by weight:
5~10 parts by weight of lithium ion battery negative material
1~5 parts by weight of conductive black
0.5~3 parts by weight of binder.
Grinding whether be in order to refine and uniformly mixing each component granularity.Preferably, it is used to form composite layer
The granularity of lithium ion battery negative material is that mesh number is greater than 50 mesh.Preferably, it is used to form the conductive black of composite layer
Granularity is that mesh number is greater than 50 mesh.Preferably, the granularity for being used to form the binder of composite material is that mesh number is greater than 50 mesh.
Preferably, the binder is polyvinylidene fluoride.
Preferably, the lithium ion battery negative electrode further includes copper foil, and the composite layer is attached to the copper foil
Surface.
Preferably, the method that the composite layer is formed are as follows: by lithium ion battery negative material, conductive black and bonding
Slurry is made in agent in organic solvent, then coated and dried.It is highly preferred that the organic solvent is N-Methyl pyrrolidone.
The invention also discloses a kind of button cells, including lithium ion battery negative electrode as described above.
Preferably, electrolyte is LiPF that mass concentration is 0.1~5mol/L in the button cell6Solution, solution
Solvent is the mixture of ethylene carbonate and diethyl carbonate；Diaphragm is polypropylene diaphragm.
It is highly preferred that the volume ratio of ethylene carbonate and diethyl carbonate is 1:(0.5~3 in the solvent).
The technical effect of above-mentioned technical proposal of the present invention are as follows:
Lithium ion battery negative material provided in the present invention is by doped with Fe3O4Curling hollow three-dimensional grapheme support,
Surface is by N doping Carbon coating simultaneously.This lithium ion battery negative material can give full play to big size graphene
Advantage provides the conductive network of long-range using big size graphene electron, provides short distance using material with carbon-coated surface for electronics
Conductive channel, to improve conductivity, N doping is improved than capacity rate, and iron oxide particle has duplicate protection and support,
Its stability and safety are improved, so that lithium ion battery negative material has superior cycle performance；In the application
Lithium ion battery negative material preparation process is simply easy to accomplish, pollution-free, has very high industrial value.
Detailed description of the invention
Fig. 1 is the flow chart of preparation method provided by the invention
Wherein,
Fig. 2 is the N-pC/Fe that embodiment 1, comparative test 1 and comparative test 2 are prepared respectively3O4/G、G/Fe3O4、N-pC/
FeOxThe nitrogen adsorption desorption curve of sample.
Fig. 3 (a) is the N-pC/Fe that embodiment 1, comparative test 1 and comparative test 2 are prepared respectively3O4/G、G/Fe3O4、 N-
pC/FeOxSample is in 1A g-1Long circulating performance comparison figure under current density.
Fig. 3 (b) is the N-pC/Fe that embodiment 1, comparative test 1 and comparative test 2 are prepared respectively3O4/G、G/Fe3O4、 N-
pC/FeOxSample is in 1A g-1High rate performance comparison diagram under current density.
Fig. 3 (c) and Fig. 3 (d) is the N-pC/Fe that embodiment 1, comparative test 1 and comparative test 2 are prepared respectively3O4/G、 G/
Fe3O4、N-pC/FeOxSample is in 1A g-1AC impedance figure before and after circulation under current density.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Before further describing the specific embodiments of the present invention, it should be appreciated that protection scope of the present invention is not limited to down
State specific specific embodiment；It is also understood that term used in the embodiment of the present invention is specific specific in order to describe
Embodiment, rather than limiting the scope of protection of the present invention.The test side of actual conditions is not specified in the following example
Method, usually according to normal condition, or according to condition proposed by each manufacturer.
When embodiment provides numberical range, it should be appreciated that except non-present invention is otherwise noted, two ends of each numberical range
Any one numerical value can be selected between point and two endpoints.Unless otherwise defined, the present invention used in all technologies and
Scientific term is identical as the normally understood meaning of those skilled in the art of the present technique.Except specific method used in embodiment, set
Outside standby, material, grasp and record of the invention according to those skilled in the art to the prior art can also be used
Any method, equipment and the material of the similar or equivalent prior art with method described in the embodiment of the present invention, equipment, material
Material is to realize the present invention.
Embodiment 1
It is dried after the foamed material PMS sponge formed using melamine is washed with water stand-by.
The graphene slurry being prepared by electrochemical stripping method is demarcated, and is diluted to 2mg/mL.By 4.5g
Fe(NO3)39H2O is dissolved in the graphene slurry that 80mL concentration is 2mg/mL and is ultrasonically treated, then by 8gPMS sponge
It is dipped into the mixed solution, continues ultrasound and make PMS sponge, graphene and Fe3+Sufficiently carry out self assembly.
The PMS sponge for absorbing graphene and ferric nitrate is taken out, is placed in refrigerator freezing storehouse and is freezed, is then placed in cold
Moisture is removed in lyophilizer.
The PMS sponge after drying is finally put into tube furnace in argon atmosphere high-temperature process at 700 DEG C, obtained production
Ferriferous oxide is in object with Fe3O4Form exist, final product be " N doping pyrolytic carbon (N doped pyrolytic
Carbon it) coats and contains Fe3O4The curling hollow form graphene composite material of particle ", is named as N-pC/Fe3O4/G。
And mix composite material, conductive black and PVDF binder according to 6:1:1 ratio, N- crassitude is added
Slurry is prepared in ketone NMP, is prepared into button cell.
Reference electrode is made using metal lithium sheet, is characterized.
Two groups of comparative experimentss are provided under identical experiment condition.
Comparative test 1: Fe(NO3)39H2O is dissolved in after graphene slurry and is directly freeze-dried, then at 700 DEG C
High-temperature process, ferriferous oxide is mainly with Fe in obtained comparative sample3O4Form exists, and is named as G/Fe3O4。
Comparative test 2: PMS sponge being dissolved in pure iron nitrate solution, carries out high-temperature process after dry, obtained comparison
Ferriferous oxide is Fe in sample3O4And Fe2O3Mixed phase, be named as N-pC/FeOx。
As shown in Fig. 2, being N-pC/Fe3O4/G、G/Fe3O4、N-pC/FeOxThe nitrogen adsorption desorption curve of sample.Pass through BET
The specific surface area that three samples are calculated is respectively N-pC/Fe3O4/G:32.3m2g-1,G/Fe3O4:6.5m2g-1, N-pC/
FeOx:5.1m2g-1。N-pC/Fe3O4The specific surface area of/G sample is much larger than other two samples, this is because PMS three-dimensional framework
In the preparation process of sample, the reunion of graphene is successfully inhibited, sample is made to possess higher specific surface area.And high ratio
Surface area can promote effective contact of composite material and electrolyte, be conducive to the abundant progress of electrochemical reaction.
It is N-pC/Fe in Fig. 3 (a)3O4/G、G/Fe3O4、N-pC/FeOxSample is in 1A g-1Long circulating under current density
Energy comparison diagram, N-pC/Fe3O4/ G sample still is able to retain 825mAh g after 350 charge and discharge cycles-1Specific capacity, it is bright
It is aobvious to be better than two comparative samples.G/Fe3O4Electrode is in 1A g-1Capacity only remains 323mAh g after 350 circulations of lower progress-1, N-pC/
FeOxElectrode 1A g-1Capacity attenuation is 393mAh g after 350 circulations of lower progress-1。
Fig. 3 (b) is high rate performance of three samples under different current densities, N-pC/Fe3O4/ G sample is in 0.2A g-1
When lower progress charge and discharge cycles, specific capacity is more than 1000mAh g-1, current density increases to 2A g-1With 5A g-1When, specific capacity
Respectively 706mAh g-1With 486mA h g-1.This means that after current density amplifies 10 times and 25 times, N-pC/Fe3O4/G
Pole piece still possesses 72.1% and 49.6% or so capacity retention ratio, and when electric current is reduced to 0.2A g again-1When, capacity
It has been restored to 1000mAh g again-1Left and right.Illustrate N-pC/Fe3O4/ G electrode possesses good high rate performance, is able to bear higher
Current density is without influencing its structural stability.
Fig. 3 (c) and Fig. 3 (d) is N-pC/Fe3O4/G、G/Fe3O4、N-pC/FeOxSample button cell AC impedance figure.
Fig. 3 (c) is the impedance diagram before button cell circulation, and Fig. 3 (d) is button cell in 1A g-1Current density under charge and discharge 10 times
AC impedance figure afterwards.In two group pictures, N-pC/Fe3O4/ G sample map is minimum in high frequency region semicircle, illustrates that charge and discharge occurs in it
Impedance is minimum when electricity reaction.
Embodiment 2
It is dried after the foamed material PMS sponge formed using melamine is washed with water stand-by.
The graphene slurry being prepared by electrochemical stripping method is demarcated, and is diluted to 2mg/mL.By 3g
FeCl3It is dissolved in the graphene slurry that 80mL concentration is 2mg/mL and is ultrasonically treated, be then dipped into 10g PMS sponge
In the mixed solution, continues ultrasound and make PMS sponge, graphene and Fe3+Sufficiently carry out self assembly.
The PMS sponge for absorbing graphene and ferric nitrate is taken out, is placed in refrigerator freezing storehouse and is freezed, is then placed in cold
Moisture is removed in lyophilizer.
The PMS sponge after drying is finally put into tube furnace in argon atmosphere high-temperature process 6h at 600 DEG C, is obtained
Ferriferous oxide is in product with Fe3O4Form exist, final product be " N doping pyrolytic carbon (N doped pyrolytic
Carbon it) coats and contains Fe3O4The curling hollow form graphene composite material of particle ", is named as N-pC/Fe3O4/G。
And mix composite material, conductive black and PVDF binder according to 10:3:1 ratio, N- methylpyrrole is added
Slurry is prepared in alkanone NMP, is prepared into button cell.
Embodiment 3
It is dried after the foamed material PMS sponge formed using melamine is washed with water stand-by.
The graphene slurry being prepared by electrochemical stripping method is demarcated, and is diluted to 2mg/mL.By 2g
Fe2(CO3)3It is dissolved in the graphene slurry that 80mL concentration is 2mg/mL and is ultrasonically treated, then soak 20g PMS sponge
It steeps in the mixed solution, continues ultrasound and make PMS sponge, graphene and Fe3+Sufficiently carry out self assembly.
The PMS sponge for absorbing graphene and ferric nitrate is taken out, is placed in refrigerator freezing storehouse and is freezed, is then placed in cold
Moisture is removed in lyophilizer.
The PMS sponge after drying is finally put into tube furnace in argon atmosphere high-temperature process 3h at 750 DEG C, is obtained
Ferriferous oxide is in product with Fe3O4Form exist, final product be " N doping pyrolytic carbon (N doped pyrolytic
Carbon it) coats and contains Fe3O4The curling hollow form graphene composite material of particle ", is named as N-pC/Fe3O4/G。
And mix composite material, conductive black and PVDF binder according to 5:1:1 ratio, N- crassitude is added
Slurry is prepared in ketone NMP, is prepared into button cell.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, those of ordinary skill in the art institute without departing from the spirit and technical ideas disclosed in the present invention such as
All equivalent modifications or change completed, should be covered by the claims of the present invention.
Claims (10)
1. a kind of preparation method of lithium ion battery negative material, includes the following steps:
1) graphene powder and source of iron presoma are mixed to form mixed solution in water, so that Fe is adhered on graphene surface layer3+；
2) nitrogenous three-dimensional porous framework material infiltration is ultrasonically treated in above-mentioned mixed solution；
3) by treated, nitrogenous three-dimensional porous framework material is freeze-dried；
4) the nitrogenous three-dimensional porous framework material after freeze-drying is heat-treated again.
2. preparation method according to claim 1, which is characterized in that including one of following feature or a variety of:
The graphene with a thickness of 0.2~0.7nm, 1 μm of graphene sheet layer diagonal length >；
The source of iron presoma is selected from Fe (NO3)3·9H2O, Fe2(CO3)3, FeCl3And Fe (OH)3One of or a variety of, iron
The additional amount of source presoma is 10~50 times of graphene powder quality；
The nitrogenous three-dimensional porous material is using the foaming formed comprising one or both of polyurethane and/or melamine
Material, the additional amount of nitrogenous three-dimensional porous material are at least 50 times of graphene powder quality；
The temperature of freeze-drying is not higher than -5 DEG C；
The temperature of heat treatment is 450 DEG C~750 DEG C；The time of heat treatment is 1h~7h.
3. a kind of lithium ion battery negative material prepared using such as the described in any item preparation methods of claim 1~2.
4. a kind of lithium ion battery negative electrode, which is characterized in that the lithium ion battery negative electrode includes using such as right
It is required that the composite layer that lithium ion battery negative material described in 3 is formed.
5. lithium ion battery negative electrode according to claim 4, which is characterized in that the composite layer includes following
The component of parts by weight:
5~10 parts by weight of lithium ion battery negative material
1~5 parts by weight of conductive black
0.5~3 parts by weight of binder.
6. lithium ion battery negative electrode according to claim 5, which is characterized in that the binder is to gather inclined difluoro second
Alkene binder.
7. lithium ion battery negative electrode according to claim 4, which is characterized in that including one of following feature or
A variety of: the lithium ion battery negative electrode further includes copper foil, and the composite layer is attached to the copper foil surface；
The method that the composite layer is formed are as follows: by lithium ion battery negative material, conductive black and binder organic molten
Slurry is made in agent, it is then coated and dried；
The organic solvent is N-Methyl pyrrolidone.
8. a kind of button cell, which is characterized in that including the lithium ion battery negative electrode as described in claim 4~7.
9. button cell according to claim 8, which is characterized in that electrolyte is that mass concentration is in the button cell
The LiPF of 0.1~5mol/L6Solution, the solvent of solution are the mixture of ethylene carbonate and diethyl carbonate；Diaphragm is poly- third
Alkene diaphragm.
10. button cell according to claim 9, which is characterized in that ethylene carbonate and carbonic acid diethyl in the solvent
The volume ratio of ester is 1:(0.5~3).
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