CN106099173B - A kind of porous polyimide anode lithium ion battery with high energy density - Google Patents
A kind of porous polyimide anode lithium ion battery with high energy density Download PDFInfo
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- CN106099173B CN106099173B CN201610570330.3A CN201610570330A CN106099173B CN 106099173 B CN106099173 B CN 106099173B CN 201610570330 A CN201610570330 A CN 201610570330A CN 106099173 B CN106099173 B CN 106099173B
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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
- H01M4/137—Electrodes based on electro-active polymers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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Abstract
The present invention relates to field of lithium ion battery, disclose a kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte, the anode includes negative current collector, the porous polyimide negative electrode layer coated on negative current collector surface, the porous ceramic layer coated on porous polyimide anode layer surface；Porous polyimide negative electrode layer is cured by polyimides cathode size to be formed；Polyimides cathode size includes 45 90 parts by weight polyimides, 10 30 parts by weight conductive agents, 0 25 parts by weight binder, 13 parts by weight pore-foaming agents, 40 80 weight parts organic solvents.The loss to capacity in initial charge SEI film forming procedures is not present in the lithium ion battery of the present invention, and also the continuous reparation there is no SEI and solvent molecule are inserted into and cause battery capacity attenuation problem altogether.Battery is free of membrane at the same time, and simply, energy density is high for small, making, and security is good.
Description
Technical field
The present invention relates to field of lithium ion battery, more particularly to a kind of porous polyimide anode high energy density lithium ion
Battery.
Background technology
The getting worse of the problems such as with environmental pollution and energy consumption, new energy industry obtain the generally pass in the annual world
Note.Lithium ion battery due to it has the advantages that environmental-friendly, energy density is high, have extended cycle life, affordable and as near
Research hotspot over year.It is widely used in fields such as number, energy storage, communication, electric cars, especially in electric automobile
Field, is being promoted with annual 50% rate of rise.
Traditional anode material for lithium-ion batteries is generally cobalt acid lithium, LiMn2O4, iron manganese phosphate for lithium, nickle cobalt lithium manganate, nickel
The higher lithium-containing compound of the electrochemical redox current potential such as cobalt lithium aluminate, anode generally use carbon material, as graphite, hard charcoal,
Soft charcoal etc..However, the gram volume of carbon material is relatively low so that the energy density of battery nearly reaches the limit.And in cyclic process with
The continuous damaged and reparation of SEI films, and the reason such as common insertion of solvent molecule, cause battery capacity decay very fast.It is new
Although negative material such as silicon class anode, tin anode etc. with higher gram volume, can not still avoid loop attenuation problem.
Meanwhile all including membrane in existing lithium ion battery, traditional membrane thicknesses are thicker, occupy substantial amounts of body
Product, the energy density of battery indirectly influenced.And need to be isolated positive and negative anodes in battery apparatus, more take
When.
The content of the invention
In order to solve the above technical problem, the present invention provides a kind of porous polyimide anode high energy density lithium ion
Battery.The present invention uses the polyimides of high molecular weight as lithium ion battery negative material, by polyimide molecule
Acyl group occurs electrochemical oxidation-reduction reaction and completes energy transfer.Using polyimides as negative material, there is no graphite-like
Loss in material initial charge SEI film forming procedures to capacity, also there is no SEI it is continuous repair and solvent molecule is inserted into altogether and
Cause battery capacity attenuation problem.The lithium ion battery of the present invention be free of membrane at the same time, small, make simply, energy density
Height, security are good.
The present invention concrete technical scheme be：A kind of porous polyimide anode lithium ion battery with high energy density, including
Cathode, anode, electrolyte.It is sub- that the anode includes negative current collector, the porous polyamides coated on the negative current collector surface
Amine negative electrode layer, the porous ceramic layer coated on the porous polyimide anode layer surface；The porous polyimide negative electrode layer
Porosity be 5-20%, aperture is 5-50 microns；Porous polyimide negative electrode layer is cured by polyimides cathode size to be formed；
The polyimides cathode size includes 45-90 parts by weight polyimides, 10-30 parts by weight conductive agent, 0-25 parts by weight and bonds
Agent, 1-3 parts by weight pore-foaming agent, 40-80 weight parts organic solvents；Wherein the summation of polyimides, conductive agent and binding agent is 100
Parts by weight.
Polyimides is a kind of special engineering plastics, it is with high temperature resistant（More than 400 DEG C）, corrosion-resistant, good mechanical property,
The advantages of simple is synthesized, a large amount of carboxyl groups are contained in its strand, since acyl group has more oxidation states, in certain condition
Under, redox reaction can occur with metal ion such as lithium ion, sodium ion, thus polyimides can be used as lithium-ion electric
The negative material in pond.The present invention is used as anode using conventional lithium ion battery positive electrode as cathode using high molecular weight polyimides
Material, occurs electrochemical oxidation-reduction reaction by the acyl group in polyimide molecule and completes energy transfer.Use polyimides
As negative material, there is no the loss in graphite type material initial charge SEI film forming procedures to capacity, also there is no SEI's
Constantly repair and solvent molecule is inserted into and causes battery capacity attenuation problem altogether.
In the present invention, porous polyimide negative electrode layer is cellular, can rely on hole Electolyte-absorptive with further
Negative electrode lithium ion conduction is reduced to hinder.
Meanwhile porous porous ceramic layer is uniformly coated in polyimides negative terminal surface, porous ceramic layer substitute tradition every
Film, one side porous ceramic layer have higher porosity, can play height with conducting lithium ions, another aspect porous ceramic layer
Warm iris action, when internal short-circuit occurs for battery core, porous ceramic layer can still obstruct positive and negative anodes and come into contact in a large area, and further prevent
Only battery thermal runaway.In addition, porous ceramic layer has relatively low thickness, will using porous ceramic layer compared with traditional membrane
Battery core volume can be greatly reduced, improves battery core volume energy density.The gram volume of the polyimides of the present invention is up to 180-
240mAh/g。
Also, in the present invention, porous polyimide negative electrode layer is engaged with porous ceramic layer, there is extra beneficial effect
Fruit：Due to anode porous polyimide negative electrode layer be high molecular material, with ceramic slurry in binding agent form stronger combination
Power, thus porous ceramic layer can be closely bonded on porous polyimide negative electrode layer, will not occur to coat ceramic slurry
The coming off of occurring on traditional anode or dry linting the problems such as.Can just because of porous ceramic layer and porous polyimide negative electrode layer
Closely fitting so that the contact interface between porous ceramic layer and anode is even closer, the favourable boundary for reducing lithium ion conduction
Face impedance, improves battery rate charge-discharge performance.And porous polyimide negative electrode layer has more preferable due to being plastic material
Toughness, it is not easy to break when anode being crimped or bent in cell fabrication processes, it is attached to porous ceramic layer on anode also not
It is easy to fall off.
Preferably, the thickness of the porous polyimide negative electrode layer is 50-200 microns；The polyimides anode slurry
Material include 70-83 parts by weight polyimides, 15-20 parts by weight conductive agent, 2-10 parts by weight binder, 1-3 parts by weight pore-foaming agent,
40-80 weight parts organic solvents；Wherein the summation of polyimides, conductive agent and binding agent is 100 parts by weight.
Preferably, the molecular weight of polyimides is 50000-2000000.
Preferably, the molecular weight of polyimides is 300000-1500000.The effect of the polyimides of high score quantum is more
It is good.
Preferably, the organic solvent is NMP or DMAC；The conductive agent is conductive carbon black, conductive fiber, carbon nanometer
Pipe, graphene；The binding agent is SBR, PVDF.The pore-foaming agent is selected from PEG1000, PEG4000 or ammonium hydrogen carbonate.
Preferably, the porous ceramic layer includes metal oxide 80-97wt%, porous ceramics layer binder 3-
20wt%；The thickness of porous ceramic layer is 5-30 microns.
Preferably, the metal oxide content is 92-97wt%, the porous ceramic layer binder content is 3-
8wt%；The metal oxide is aluminium oxide or zirconium oxide；The porous ceramics layer binder for SBR, CMC, PVDF, PTFE or
Acrylic adhesive；Porous ceramics layer thickness is 5-25 microns.
Preferably, the negative current collector is copper foil or the copper foil coated with conductive coating.It is pre-coated with leading on copper foil
Electrocoat, conductive priming coat can improve the bond effect between polyimides and copper foil current collector, and further overcome poly-
The shortcomings that acid imide electric conductivity is bad.
Preferably, the positive electrode of the cathode is selected from cobalt acid lithium, LiMn2O4, iron manganese phosphate for lithium, nickle cobalt lithium manganate, nickel
Cobalt lithium aluminate；The conductive agent of cathode is selected from conductive carbon black, conductive fiber, carbon nanotubes, graphene；The binding agent of cathode is selected from
PVDF, polyacrylic binding agent；LiPF of the electrolyte using concentration as 1.0-1.2mol/L6For solute, with EC, PC,
EMC, DMC are solvent.
Polyimides anode and above-mentioned cathode, electrolyte etc. are coordinated, obtained performance of lithium ion battery is more preferably.
A kind of electric car, contains above-mentioned porous polyimide anode lithium ion battery with high energy density.
It is compared with the prior art, the beneficial effects of the invention are as follows：
The present invention uses the polyimides of high molecular weight as lithium ion battery negative material, by polyimide molecule
Acyl group electrochemical oxidation-reduction reaction occur complete energy transfer.Using polyimides as negative material, there is no graphite
Loss in class material initial charge SEI film forming procedures to capacity, also the continuous reparation there is no SEI and solvent molecule are inserted into altogether
And cause battery capacity attenuation problem.The lithium ion battery of the present invention is free of membrane at the same time, and simply, energy is close for small, making
Degree is high, and security is good.
Brief description of the drawings
Fig. 1 is 1 lithium ion battery plus-negative plate assembly structure diagram of embodiment.
Reference numeral is：Negative current collector 1, porous polyimide negative electrode layer 2, porous ceramic layer 3, plus plate current-collecting body 4, just
Pole material layer 5.
Embodiment
With reference to embodiment, the invention will be further described.
Embodiment 1
A kind of polyimides anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
As shown in Figure 1, the anode includes negative current collector 1, the polyimides coated on the negative current collector surface
Negative electrode layer 2, the ceramic layer 3 coated on the polyimides anode layer surface.Cathode includes plus plate current-collecting body 4, coated on cathode
The positive electrode material layer 5 of collection liquid surface.The porosity of the porous polyimide negative electrode layer is 12%, and aperture is 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.10 microns after copper foil, conductive coating single side thickness 2 is micro-
Rice.The polyimides negative electrode layer is cured by polyimides cathode size to be formed；The polyimides cathode size includes 83 weights
Measure polyimides, 13 parts by weight conductive carbon blacks, 1 parts by weight of carbon nanotubes, 3 parts by weight PVDF that part molecular weight is 350000,
2 parts of PEG1000,60 parts by weight NMP, make polyimides cathode size viscosity-adjusting agent to 8000Cp.Wherein, the polyimides
The thickness of negative electrode layer is 125 microns；The ceramic layer thickness is 10 microns, including aluminium oxide 93wt%, SBR 53wt%, CMC
4wt%。
The positive electrode of the cathode is LiFePO4；The conductive agent of cathode is conductive carbon black；The binding agent of cathode is
PVDF；LiPF of the electrolyte using concentration as 1.1mol/L6For solute, with EC:EMC:DMC=1:1:1 is solvent.
Embodiment 2
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
As shown in Figure 1, the anode includes negative current collector 1, the porous polyamides coated on the negative current collector surface
Imines negative electrode layer 2, the porous ceramic layer 3 coated on the porous polyimide anode layer surface.Cathode includes plus plate current-collecting body
4th, the positive electrode material layer 5 coated on plus plate current-collecting body surface.The porosity of the porous polyimide negative electrode layer is 12%, aperture
For 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.The porous polyimide negative electrode layer is by polyimides
Cathode size, which cures, to be formed；The polyimides cathode size includes the polyimides that 76 parts by weight molecular weight are 500000,18
Parts by weight conductive carbon black, 2 parts of 6 parts by weight SBR, PEG1000,60 parts by weight NMP.Wherein, the porous polyimide negative electrode layer
Thickness be 125 microns；The porous ceramics layer thickness is 15 microns, including aluminium oxide 95wt%, SBR 5wt%.
The positive electrode of the cathode is cobalt acid lithium；The conductive agent of cathode is conductive carbon black；The binding agent of cathode is PVDF；
LiPF of the electrolyte using concentration as 1.1mol/L6For solute, using EC as solvent.
Embodiment 3
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
The anode include negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface,
Porous ceramic layer coated on the porous polyimide anode layer surface.The porosity of the porous polyimide negative electrode layer is
5%, aperture is 5-50 microns.
The negative current collector is copper foil.The porous polyimide negative electrode layer cured by polyimides cathode size and
Into；The polyimides cathode size include 83 parts by weight molecular weight be 300000 polyimides, 15 parts by weight conductive fibers,
21 part of parts by weight PVDF, PEG4000,40 parts by weight DMAC.Wherein, the thickness of the porous polyimide negative electrode layer is micro- for 50
Rice；The porous ceramics layer thickness is 5 microns, including zirconium oxide 97wt%, CMC 3wt%.
The positive electrode of the cathode is LiMn2O4；The conductive agent of cathode is conductive fiber；The binding agent of cathode is poly- third
Alkene acrylic binders；LiPF of the electrolyte using concentration as 1.0mol/L6For solute, using PC as solvent.
Embodiment 4
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
The anode include negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface,
Porous ceramic layer coated on the porous polyimide anode layer surface.The porosity of the porous polyimide negative electrode layer is
20%, aperture is 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.The porous polyimide negative electrode layer is by polyimides
Cathode size, which cures, to be formed；The polyimides cathode size includes the polyimides that 70 parts by weight molecular weight are 1500000,20
Parts by weight of carbon nanotubes, 10 parts by weight PVDF, 3 parts of ammonium hydrogen carbonate, 80 parts by weight NMP.Wherein, the porous polyimide anode
The thickness of layer is 200 microns；The porous ceramics layer thickness is 30 microns, including aluminium oxide 80wt%, PVDF20wt%.
The positive electrode of the cathode is iron manganese phosphate for lithium；The conductive agent of cathode is carbon nanotubes；The binding agent of cathode is
PVDF；LiPF of the electrolyte using concentration as 1.2mol/L6For solute, using EMC as solvent.
Embodiment 5
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
The anode include negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface,
Porous ceramic layer coated on the porous polyimide anode layer surface.The porosity of the porous polyimide negative electrode layer is
10%, aperture is 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.The porous polyimide negative electrode layer is by polyimides
Cathode size, which cures, to be formed；The polyimides cathode size includes the polyimides that 45 parts by weight molecular weight are 50000,30 weights
Measure part graphene, 25 parts by weight SBR, 1.5 parts of ammonium hydrogen carbonate, 65 parts by weight NMP.Wherein, the porous polyimide negative electrode layer
Thickness be 150 microns；The porous ceramics layer thickness is 25 microns, including zirconium oxide 90wt%, PTFE 10wt%.
The positive electrode of the cathode is nickle cobalt lithium manganate；The conductive agent of cathode is graphene；The binding agent of cathode is poly-
Acrylic adhesive；LiPF of the electrolyte using concentration as 1.1mol/L6For solute, using DMC as solvent.
Embodiment 6
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
The anode include negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface,
Porous ceramic layer coated on the porous polyimide anode layer surface.The porosity of the porous polyimide negative electrode layer is
15%, aperture is 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.The porous polyimide negative electrode layer is by polyimides
Cathode size, which cures, to be formed；The polyimides cathode size includes the polyimides that 90 parts by weight molecular weight are 2000000,10
Parts by weight of graphite alkene, 2 parts of PEG4000,70 parts by weight DMAC.Wherein, the thickness of the porous polyimide negative electrode layer is 100
Micron；The porous ceramics layer thickness is 10 microns, including aluminium oxide 95wt%, acrylic adhesive 5wt%.
The positive electrode of the cathode is nickel cobalt lithium aluminate；The conductive agent of cathode is graphene；The binding agent of cathode is poly-
Acrylic adhesive；LiPF of the electrolyte using concentration as 1.1mol/L6For solute, using DMC as solvent.
Embodiment 7
A kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte.
The anode include negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface,
Porous ceramic layer coated on the porous polyimide anode layer surface.The porosity of the porous polyimide negative electrode layer is
15%, aperture is 5-50 microns.
The negative current collector is the copper foil coated with conductive coating.The porous polyimide negative electrode layer is by polyimides
Cathode size, which cures, to be formed；The polyimides cathode size includes the polyimides that 78 parts by weight molecular weight are 350000,20
Parts by weight of carbon nanotubes, 2 parts of 2 parts by weight SBR, PEG4000,50 parts by weight DMAC.Wherein, the porous polyimide anode
The thickness of layer is 50 microns；The porous ceramics layer thickness is 5 microns, including aluminium oxide 92wt%, PTFE 7wt%.
The positive electrode of the cathode is cobalt acid lithium；The conductive agent of cathode is carbon nanotubes；The binding agent of cathode is PVDF；
LiPF of the electrolyte using concentration as 1.1mol/L6For solute, using DMC as solvent.
Embodiment 8
A kind of electric car, the porous polyimide anode lithium ion battery with high energy density containing embodiment 1.
Comparative example
A kind of polyimides anode lithium ion battery with high energy density, with the lithium ion battery of embodiment 1 difference lies in,
Polyimides negative electrode layer is not cellular.
Performance test
The lithium ion battery of lithium ion battery and comparative example to embodiment 1 carries out battery cycle life test, test
As a result it is that for the lithium ion battery of embodiment 1 after 2000 circulations, capacitance conservation rate is higher than comparative example by 20% or so.
Raw materials used in the present invention, equipment, is the common raw material, equipment of this area unless otherwise noted；In the present invention
Method therefor, is the conventional method of this area unless otherwise noted.
The above, is only presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and the equivalent transformation that technical spirit makees above example, still fall within the technology of the present invention side
The protection domain of case.
Claims (10)
1. a kind of porous polyimide anode lithium ion battery with high energy density, including cathode, anode, electrolyte, its feature exist
In：The anode includes negative current collector, the porous polyimide negative electrode layer coated on the negative current collector surface, is coated on
The porous ceramic layer of the porous polyimide anode layer surface；The porosity of the porous polyimide negative electrode layer is 5-20%,
Aperture is 5-50 microns；Porous polyimide negative electrode layer is cured by polyimides cathode size to be formed；The polyimides anode
Slurry includes 45-90 parts by weight polyimides, 10-30 parts by weight conductive agent, 0-25 parts by weight binder, 1-3 parts by weight pores
Agent, 40-80 weight parts organic solvents；Wherein the summation of polyimides, conductive agent and binding agent is 100 parts by weight.
A kind of 2. porous polyimide anode lithium ion battery with high energy density as claimed in claim 1, it is characterised in that institute
The thickness for stating porous polyimide negative electrode layer is 50-200 microns；The polyimides cathode size gathers including 70-83 parts by weight
Acid imide, 15-20 parts by weight conductive agent, 2-10 parts by weight binder, 1-3 parts by weight pore-foaming agent, 40-80 parts by weight are organic molten
Agent；Wherein the summation of polyimides, conductive agent and binding agent is 100 parts by weight.
3. a kind of porous polyimide anode lithium ion battery with high energy density as claimed in claim 1, it is characterised in that poly-
Imido molecular weight is 50000-2000000.
4. a kind of porous polyimide anode lithium ion battery with high energy density as claimed in claim 3, it is characterised in that poly-
Imido molecular weight is 300000-1500000.
A kind of 5. porous polyimide anode lithium ion battery with high energy density as claimed in claim 2, it is characterised in that institute
It is NMP or DMAC to state organic solvent；The conductive agent is conductive carbon black, conductive fiber, carbon nanotubes, graphene；The bonding
Agent is SBR, PVDF；The pore-foaming agent is selected from PEG1000, PEG4000 or ammonium hydrogen carbonate.
A kind of 6. porous polyimide anode lithium ion battery with high energy density as claimed in claim 1, it is characterised in that institute
Stating porous ceramic layer includes metal oxide 80-97wt%, porous ceramics layer binder 3-20wt%；The thickness of porous ceramic layer is
5-30 microns.
A kind of 7. porous polyimide anode lithium ion battery with high energy density as claimed in claim 6, it is characterised in that
The metal oxide content is 92-97wt%, and the porous ceramic layer binder content is 3-8wt%；The metal oxide
For aluminium oxide or zirconium oxide；The porous ceramics layer binder is SBR, CMC, PVDF, PTFE or acrylic adhesive；It is porous
Ceramic layer thickness is 5-25 microns.
A kind of 8. porous polyimide anode lithium ion battery with high energy density as claimed in claim 1, it is characterised in that institute
It is copper foil or the copper foil coated with conductive coating to state negative current collector.
A kind of 9. porous polyimide anode lithium ion battery with high energy density as claimed in claim 1, it is characterised in that institute
The positive electrode for stating cathode is selected from cobalt acid lithium, LiMn2O4, iron manganese phosphate for lithium, nickle cobalt lithium manganate, nickel cobalt lithium aluminate；The conduction of cathode
Agent is selected from conductive carbon black, conductive fiber, carbon nanotubes, graphene；The binding agent of cathode is selected from PVDF, polyacrylic bonds
Agent；LiPF of the electrolyte using concentration as 1.0-1.2mol/L6For solute, using EC, PC, EMC, DMC as solvent.
10. a kind of electric car, it is characterised in that contain the porous polyimide anode high energy as described in one of claim 1-9
Metric density lithium ion battery.
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| CN105633349A (en) * | 2014-11-06 | 2016-06-01 | 东莞新能源科技有限公司 | Negative plate of lithium ion battery, preparation method of negative plate and lithium ion battery |
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