CN107768589A - A kind of high safety type lithium ion battery with high energy density - Google Patents
A kind of high safety type lithium ion battery with high energy density Download PDFInfo
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- CN107768589A CN107768589A CN201610668167.4A CN201610668167A CN107768589A CN 107768589 A CN107768589 A CN 107768589A CN 201610668167 A CN201610668167 A CN 201610668167A CN 107768589 A CN107768589 A CN 107768589A
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
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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
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- 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
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Abstract
The present invention relates to a kind of high safety type lithium ion battery with high energy density, the battery includes positive pole, negative pole, barrier film, electrolyte, lug and shell, positive pole and negative pole are separated with barrier film, winding or lamination form battery core, lug is respectively welded on both positive and negative polarity pole piece, battery core is encapsulated into battery case to inject electrolyte and seal and obtains battery, with LiFePO4, LiMn2O4, cobalt acid lithium, nickel cobalt aluminium or the main material that nickel-cobalt-manganese ternary material is positive active material, the indium oxide coated with CNT, polyaniline, graphene, poly styrene sulfonate and binding agent are positive active material auxiliary material, the lug of positive pole and negative pole is coated with PTC coatings.One layer of PTC coating is coated with lithium battery pole ear opening position so that battery just can realize open circuit at the initial stage of thermal runaway by the protection of PTC coatings, so as to control the further generation of thermal runaway, it is therefore prevented that the unsafe condition such as battery catches fire blast.
Description
Technical field
The present invention relates to field of lithium ion battery, especially a kind of effectively control battery thermal runaway, cell safety is greatly improved
Property with improve battery performance high safety type lithium ion battery with high energy density.
Background technology
The dual-pressure deficient from environmental pollution and petroleum resources has greatly promoted the development of electric automobile.Lithium ion
Battery turns into the emphasis that Vehicular dynamic battery is researched and developed because of significant advantages such as, good cycles higher than energy.However, constantly occur
Safety hazards seriously hinder the commercial applications of Large Copacity and high power lithium ion cell.Lithium ion battery security
Accident inducement is a lot, overcharge, short circuit, extruding, vibration, collision etc., but in terms of the mechanism of generation, nothing more than voltage it is out of control and
Both thermal runaways.On the one hand, due to use organic solution electrolyte, unlike aqueous electrolyte can reversible decomposition answer
Close, thus irreversible oxidation decomposition easily occurs in overcharging state, produce imflammable gas and release big calorimetric, cause battery
Internal temperature and pressure steeply rise, and trigger thermal runaway even to explode.On the other hand, because inside battery has many possible hairs
Raw exothermic reaction, inside battery temperature rise will be caused if there is inside and outside short circuit phenomenon during use.Once internal temperature
When degree rises to 120 DEG C, carbon anode surface passivating film (i.e. SEI films) is decomposed unavoidably, loses the high activity of passivating film protection
Vigorous reaction occurs between organic electrolyte for embedding Li-C Electrode, a large amount of imflammable gas and heat is released, so as to cause electricity
The danger such as burning occur inside pond.It finally can also show as thermal runaway it can be seen that voltage is out of control and then make battery produce danger
Danger, so the key point for solving lithium battery safety problem is exactly to prevent thermal runaway.
PTC：Positive Temperature Coefficient positive temperature coefficients
Prevent the scheme of lithium ion battery thermal runaway from mainly having at present：(1) the subsidiary PTC-element outside battery pack, works as battery pack
When temperature is increased to the Curie temperature of PTC-element, PTC-element internal resistance increases rapidly, and battery pack temperature is prevented so as to cut off electric current
Further rise；(2) using the refractory coating barrier film (or electrode) of inorganic oxide ceramic (such as aluminum oxide) modification, although heat-resisting
Coating can effectively prevent the internal short-circuit because caused by temperature rise causes diaphragm retracts；(3) PTC electrodes are coated and electrode
Between collector and active material, so perceiving inside battery at any time, caused temperature becomes due to excessively stream or internal short-circuit
Change, reduce or block the electric current passed through.
Three kinds of schemes mentioned above have the defects of respective, are respectively：(1) PTC-element energy subsidiary outside battery pack
Enough monitoring the thermal runaway caused by abuse condition such as overcharge due to external short circuit, but because it is away from electrode and electrolyte liquor interface, it is right
Inside battery thermal runaway can not play timely monitoring and inhibitory action；(2) inorganic oxide ceramic (such as aluminum oxide) modification
Refractory coating barrier film (or electrode), although refractory coating can be prevented effectively in because caused by temperature rise causes diaphragm retracts
Portion's short circuit, but to other side reactions and external short circuit caused by the overheat, overcharge etc. caused by thermal runaway it is helpless；
(3) although PTC coatings can play certain protective effect to thermal runaway outwardly and inwardly, PTC coatings add collection
Contact impedance between fluid and active material, the high rate performance of battery is had a great influence, and PTC coatings can reduce battery
Energy density, in addition such one layer of coating also virtually increase the complexity of manufacturing process.
The content of the invention
It is an object of the invention to can not take into account outside in control lithium battery thermal runaway technology to solve prior art
With a kind of effectively control battery thermal runaway is provided the defects of internal thermal runaway, battery security is greatly improved and raising is cell performance
The high safety type lithium ion battery with high energy density of energy.
To achieve these goals, the present invention uses following technical scheme：
A kind of high safety type lithium ion battery with high energy density, the battery include positive pole, negative pole, barrier film, electrolyte, lug with
And shell, positive pole and negative pole are separated with barrier film, winding or lamination form battery core, and lug is respectively welded at both positive and negative polarity pole piece
On, battery core is encapsulated into injection electrolyte in battery case and sealing obtains battery, with LiFePO4, LiMn2O4, cobalt acid lithium, nickel
Cobalt aluminium or the main material that nickel-cobalt-manganese ternary material is positive active material, with the indium oxide, polyaniline, graphite of CNT cladding
Alkene, poly styrene sulfonate and binding agent are positive active material auxiliary material, and the lug of positive pole and negative pole is coated with PTC coatings.
In the technical program, one layer of PTC coating is coated with lithium battery pole ear opening position so that battery thermal runaway initial stage with regard to energy
Open circuit is realized by the protection of PTC coatings, so as to control the further generation of thermal runaway, it is therefore prevented that the danger such as battery catches fire blast
Dangerous situation.
Preferably, the mass ratio of main material and auxiliary material is 3-5：1, the parts by weight of various components are in auxiliary material:50-
60 parts of polyanilines, 30-35 parts graphene oxide, 40-50 parts poly styrene sulfonate, 10-15 parts binding agent and 40-45 part nanometers
The indium oxide of carbon pipe cladding.In the technical program, polyaniline, graphene oxide, poly styrene sulfonate and CNT bag
Auxiliary material of the indium oxide covered as positive active material, there is very high conductance, high mechanical properties and corrosion resistance, can
The electronic conduction ability of positive active material is improved,.Therefore polyaniline, graphene oxide, poly styrene sulfonate and nano-sized carbon
Auxiliary material of the indium oxide of pipe cladding as positive active material, can improve battery performance, and and can improves corrosion resistance, extends
The life-span of lithium ion battery.
Preferably, the preparation method of the indium oxide of CNT cladding is：Indium oxide is dissolved in into diethylene glycol (DEG) to be reacted
System, sodium hydroxide is then slowly added into, 140-160 DEG C is warming up in 2-2.5h after stirring 1-3h, is cooled down after reacting 1-3h；
Centrifuge obtained sediment and use volume ratio 1 successively:2 ethanol washs with methyl acetate mixed solution, acetone, deionized water, very
Sky is dried to obtain base core nano indium oxide；Then by the nano oxidized chlorine ultrasonic disperse of base core in absolute ethyl alcohol, add to contain and receive
The ethanol solution of rice carbon pipe, is added dropwise concentrated ammonia liquor, stirring reaction 1-1.5h at 85-95 DEG C, the sediment being centrifugally separating to obtain
Washed successively with absolute ethyl alcohol, deionized water, crushed after roasting and obtain CNT cladding nano indium oxide.
Preferably, the temperature of roasting is 600-750 DEG C, time 2-5h, it is 10-100nm to be crushed to particle diameter.
Preferably, negative material is graphite-like, silicon materials class or alloy anode class material.
Preferably, barrier film is the nonwoven that polyethylene, polypropylene, polyimides or surface are coated with nano ceramic material
Cloth.In the technical program, using the good heat endurance of nano ceramic material and mechanical feature, lithium ion battery is improved
Security performance, while nano ceramic material cost is relatively low.
Preferably, the preparation method of non-woven fabrics of the surface coated with nano ceramic material is：Using plasma spraying skill
Nano ceramic material is injected in nonwoven surface by art.
Preferably, PTC coatings are made up of the raw material of following parts by weight：60-90 part PTC matrix materials, 5-20 parts are disperseed
Agent and 5-20 part binding agents.
Preferably, PTC matrix materials are BaTiO3、V2O3Or BaPbO3；Dispersant be Triton X-100,
Polyethylene glycol oxide or polyacrylic acid, binding agent are Kynoar, polyvinylidene fluoride -co- hexafluoropropene, gather inclined 1,1-
It is difluoroethylene -co- trichloro ethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, poly-
Ethylene-co-vinyl acetate, PEO, cellulose acetate, cellulose acetate-butyrate, cellulose-acetate propionate, cyanoethyl
Amylopectin, cyanoethyl polyvinylalcohol, cyanethyl cellulose, cyanoethyl sucrose, amylopectin, carboxymethyl cellulose one kind or two
The mixture of the kind above.
Adhesive gelatin is made preferably, binding agent is dissolved in solvent, then by PTC matrix materials, dispersant, viscous
Knot agent glue is mixed into coating paste, and 30-45min is stirred by ultrasonic under 65-85 DEG C, 55-65KHz, by obtained coating
On positive pole and negative lug, vacuum drying obtains slurry dual coating.
The beneficial effects of the invention are as follows：
1) when short circuit (including outwardly and inwardly short-circuit) or super-charge super-discharge occur for battery, electric current that battery pole ear position passes through
Maximum, the caloric value of lug position is also maximum, is passed through so can timely and effectively be controlled in lug position increase PTC coatings
The thermal runaway that outwardly and inwardly reason is introduced, prevents inside battery from further reacting, and prevents the unsafe conditions such as blast on fire from occurring；
2) more simple and easy, complex operation degree reduction, saving are coated on pole piece relatively in lug opening position coating PTC coatings
Manufacturing cost；
3) it is much smaller than in influence of the lug opening position coating PTC coatings for battery energy density on pole piece and coats PTC coatings.
Embodiment
Below by specific embodiment, technical scheme is described in further detail.It should be appreciated that this hair
Bright implementation is not limited to the following examples, and any formal accommodation and/or change made to the present invention will all fall
Enter the scope of the present invention.
In the present invention, if not refering in particular to, all parts, percentage are unit of weight, used equipment and raw material etc.
It is commercially available or commonly used in the art.Method in following embodiments, it is the normal of this area unless otherwise instructed
Rule method.
Embodiment 1
It is prepared by positive plate：Nickel-cobalt-manganese ternary material is chosen as positive electrode main material, with the indium oxide of CNT cladding, is gathered
Aniline, graphene, poly styrene sulfonate and binding agent are the mass ratio of positive active material auxiliary material, main material and auxiliary material
For 3：1, the parts by weight of various components are in auxiliary material:50 parts of polyanilines, 30 parts of graphene oxides, 40 parts of polystyrolsulfon acids
The indium oxide of salt, 10 parts of binding agents and 40 parts of CNT claddings.By positive electrode active materials: conductive agent: binding agent=18: 1: 1
Part by weight blended anode slurry, uniformly coated on positive pole base flow body aluminium foil.Rolled after drying with roller, so
Anode pole piece is made in cutting afterwards.Wherein, the preparation method of the indium oxide of CNT cladding is：Indium oxide is dissolved in into diethylene glycol (DEG) to obtain
To reaction system, sodium hydroxide is then slowly added into, 140 DEG C are warming up in 2h after stirring 1h, is cooled down after reacting 1h；Centrifuge
The sediment arrived uses volume ratio 1 successively:2 ethanol washs with methyl acetate mixed solution, acetone, deionized water, vacuum drying
Obtain base core nano indium oxide；Then by the nano oxidized chlorine ultrasonic disperse of base core in absolute ethyl alcohol, addition contains CNT
Ethanol solution, concentrated ammonia liquor is added dropwise, stirring reaction 1h at 85 DEG C, the sediment being centrifugally separating to obtain is successively with anhydrous second
Alcohol, deionized water washing, crushed after roasting and obtain CNT cladding nano indium oxide, the temperature of roasting is 600 DEG C, and the time is
2h, it is 10-100nm to be crushed to particle diameter.
It is prepared by negative plate：From graphite material as negative electrode active material, according to active material：Conductive agent：Binding agent=
95:1:4 ratio is mixed to get cathode size with aqueous solvent, uniformly coated on negative pole base flow body copper foil.With stone roller after drying
Press is rolled, and cathode pole piece is made in then cutting.
Barrier film prepares：Choose commercial PE barrier films.
Electrolyte prepares：Choose commercial LiPF6It is dissolved in the electrolyte of organic solution.
Lug prepares：Lithium ion cell positive ear is chosen, the lug material is aluminium, and binding agent is dissolved in into organic solvent is made
Adhesive gelatin, the binding agent are Kynoar, and organic solvent is 1-METHYLPYRROLIDONE (NMP), binding agent with it is organic molten
The part by weight of agent is 1：19.Dispersant and PTC matrix materials are added in adhesive gelatin, stirring forms PTC slurries, should
PTC matrix materials are BaTiO3, dispersant is Triton X-100, matrix material, dispersant, the parts by weight of binding agent
Number is respectively 90 parts, and 5 parts, 5 parts, be coated in anode ear surface by above-mentioned PTC slurries, coating thickness is 5 μm of one side, then
The lug of the coating containing PTC is made in vacuum drying.
It is prepared by battery：Battery core is made in above-mentioned positive/negative plate and barrier film by way of lamination, and lug is welded, then encapsulates
In aluminum plastic film, electrolyte, sealing are injected, chemical conversion obtains battery.
Embodiment 2
It is prepared by positive plate：Nickel cobalt aluminium is chosen as positive electrode main material, with the indium oxide, polyaniline, stone of CNT cladding
Black alkene, poly styrene sulfonate and binding agent are positive active material auxiliary material, and the mass ratio of main material and auxiliary material is 4：1,
The parts by weight of various components are in auxiliary material:55 parts of polyanilines, 32 parts of graphene oxides, 45 parts of poly styrene sulfonates, 12 parts
The indium oxide of binding agent and 43 parts of CNT claddings.By positive electrode active materials: conductive agent: binding agent=89: 6: 4 weight ratio
Example blended anode slurry, uniformly coated on positive pole base flow body aluminium foil.Rolled after drying with roller, then cutting system
Into anode pole piece.Wherein, the preparation method of the indium oxide of CNT cladding is：Indium oxide is dissolved in diethylene glycol (DEG) and obtains reactant
System, sodium hydroxide is then slowly added into, 150 DEG C are warming up in 2.5h after stirring 2h, is cooled down after reacting 2h；Centrifugation obtains heavy
Starch uses volume ratio 1 successively:2 ethanol washs with methyl acetate mixed solution, acetone, deionized water, and vacuum drying obtains base
Core nano indium oxide；Then the nano oxidized chlorine ultrasonic disperse of base core is added containing the anhydrous of CNT in absolute ethyl alcohol
Ethanol solution, concentrated ammonia liquor is added dropwise, stirring reaction 1.5h at 90 DEG C, the sediment being centrifugally separating to obtain successively with absolute ethyl alcohol, go
Ion water washing, crushed after roasting and obtain CNT cladding nano indium oxide, the temperature of roasting is 700 DEG C, time 3h, powder
It is 10-100nm to be broken to particle diameter.
It is prepared by negative plate：From lithium titanate as negative electrode active material, according to active material：Conductive agent：Binding agent=95:
1:4 ratio is mixed to get cathode size with aqueous solvent, uniformly coated on negative pole base flow body copper foil.Roller is used after drying
Rolled, cathode pole piece is made in then cutting.
Barrier film prepares：It is barrier film to choose non-woven fabrics of the surface coated with nano ceramic material, and surface is coated with nano ceramics
The preparation method of the non-woven fabrics of material is：Nano ceramic material is injected in by nonwoven surface using plasma spraying technology.
Electrolyte prepares：Choose commercial LiPF6It is dissolved in the electrolyte of organic solution.
Lug prepares：Lithium ionic cell cathode ear pole is chosen, the lug material is aluminium, and binding agent is dissolved in into organic solvent system
Into adhesive gelatin, the binding agent is polyvinylidene fluoride -co- trichloro ethylene, and organic solvent is 1-METHYLPYRROLIDONE
(NMP), the part by weight of binding agent and organic solvent is 1:20.Dispersant and PTC matrix materials are added to adhesive gelatin
In, stirring forms PTC slurries, and the PTC matrix materials are V2O3, dispersant is polyethylene glycol oxide, matrix material, dispersant, is bonded
The parts by weight of agent are respectively 60 parts, 20 parts, 20 parts；It is to be coated in anode ear surface, coating thickness by above-mentioned PTC slurries
5 μm of one side, then it is dried in vacuo the lug that the coating containing PTC is made.
It is prepared by battery：Battery core is made in above-mentioned positive/negative plate and barrier film by way of lamination, and lug is welded, then encapsulates
In aluminum plastic film, electrolyte, sealing are injected, chemical conversion obtains battery.
Embodiment 3
It is prepared by positive plate：LiMn2O4 is chosen as positive electrode main material, with the indium oxide, polyaniline, stone of CNT cladding
Black alkene, poly styrene sulfonate and binding agent are positive active material auxiliary material, and the mass ratio of main material and auxiliary material is 5：1,
The parts by weight of various components are in auxiliary material:60 parts of polyanilines, 35 parts of graphene oxides, 50 parts of poly styrene sulfonates, 15 parts
The indium oxide of binding agent and 45 parts of CNT claddings.By positive electrode active materials: conductive agent: binding agent=95: 2: 3 weight ratio
Example blended anode slurry, uniformly coated on positive pole base flow body aluminium foil.Rolled after drying with roller, then cutting system
Into anode pole piece.Wherein, the preparation method of the indium oxide of CNT cladding is：Indium oxide is dissolved in diethylene glycol (DEG) and obtains reactant
System, sodium hydroxide is then slowly added into, 160 DEG C are warming up in 2.5h after stirring 3h, is cooled down after reacting 3h；Centrifugation obtains heavy
Starch uses volume ratio 1 successively:2 ethanol washs with methyl acetate mixed solution, acetone, deionized water, and vacuum drying obtains base
Core nano indium oxide；Then the nano oxidized chlorine ultrasonic disperse of base core is added containing the anhydrous of CNT in absolute ethyl alcohol
Ethanol solution, concentrated ammonia liquor is added dropwise, stirring reaction 1.5h at 95 DEG C, the sediment being centrifugally separating to obtain successively with absolute ethyl alcohol, go
Ion water washing, crushed after roasting and obtain CNT cladding nano indium oxide, the temperature of roasting is 750 DEG C, time 5h, powder
It is 10-100nm to be broken to particle diameter.
It is prepared by negative plate：From graphite material as negative electrode active material, according to active material：Conductive agent：Binding agent=
95:1:4 ratio is mixed to get cathode size with aqueous solvent, uniformly coated on negative pole base flow body copper foil.With stone roller after drying
Press is rolled, and cathode pole piece is made in then cutting.
Barrier film prepares：Choose polypropylene diaphragm.
Electrolyte prepares：Choose commercial LiPF6It is dissolved in the electrolyte of organic solution.
Lug prepares：It is aluminium to choose lithium ion cell positive ear and negative lug, lug material, binding agent is dissolved in organic
Adhesive gelatin is made in solvent, and the binding agent is that the mixture quality ratio of Kynoar and carboxymethyl cellulose is 1：1, it is organic
Solvent is 1-METHYLPYRROLIDONE (NMP), and the part by weight of binding agent and organic solvent is 3:97.By dispersant and PTC matrixes
Material is added in adhesive gelatin, and stirring forms PTC slurries, and the PTC matrix materials are BaPbO3, dispersant is polypropylene
Acid, matrix material, dispersant, the parts by weight of binding agent are respectively 70 parts, 15 parts, 15 parts；It is coating by above-mentioned PTC slurries
On anode ear surface, coating thickness is 5 μm of one side, is then dried in vacuo the lug that the coating containing PTC is made.
It is prepared by battery：Battery core is made in above-mentioned positive/negative plate and barrier film by way of lamination, and lug is welded, then encapsulates
In aluminum plastic film, electrolyte, sealing are injected, chemical conversion obtains battery.
After tested, the efficiency first of the battery reaches 98%, and energy density can reach 300Wh/kg.Significantly improve existing electricity
The first effect and energy density in pond.And the battery can by overcharging, cross put, the safety test such as acupuncture and extruding, say the battery
With extraordinary security performance.
It should be appreciated that to those skilled in the art, it can according to the above description be improved or be become
Change, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of high safety type lithium ion battery with high energy density, the battery includes positive pole, negative pole, barrier film, electrolyte, lug
And shell, positive pole and negative pole are separated with barrier film, winding or lamination form battery core, and lug is respectively welded at both positive and negative polarity pole piece
On, battery core is encapsulated into injection electrolyte in battery case and sealing obtains battery, it is characterised in that with LiFePO4, mangaic acid
Lithium, cobalt acid lithium, nickel cobalt aluminium or nickel-cobalt-manganese ternary material are the main material of positive active material, with the oxidation of CNT cladding
Indium, polyaniline, graphene, poly styrene sulfonate and binding agent are positive active material auxiliary material, the lug of negative or positive electrode
Coated with PTC coatings.
A kind of 2. high safety type lithium ion battery with high energy density according to claim 1, it is characterised in that main material with
The mass ratio of auxiliary material is 3-5：1, the parts by weight of various components are in auxiliary material:50-60 parts polyaniline, 30-35 parts oxidation stone
Black alkene, 40-50 parts poly styrene sulfonate, 10-15 parts binding agent and the indium oxide of 40-45 parts CNT cladding.
A kind of 3. high safety type lithium ion battery with high energy density according to claim 1 or 2, it is characterised in that nanometer
The preparation method of indium oxide of carbon pipe cladding is：Indium oxide is dissolved in diethylene glycol (DEG) and obtains reaction system, is then slowly added into hydrogen-oxygen
Change sodium, 140-160 DEG C is warming up in 2-2.5h after stirring 1-3h, is cooled down after reacting 1-3h；Centrifuge obtained sediment successively
With volume ratio 1:2 ethanol washs with methyl acetate mixed solution, acetone, deionized water, and vacuum drying obtains base core nano oxygen
Change indium；Then the nano oxidized chlorine ultrasonic disperse of base core is added into the ethanol solution containing CNT in absolute ethyl alcohol,
Concentrated ammonia liquor is added dropwise, stirring reaction 1-1.5h at 85-95 DEG C, the sediment being centrifugally separating to obtain is successively with absolute ethyl alcohol, deionization
Water washing, crushed after roasting and obtain CNT cladding nano indium oxide.
A kind of 4. high safety type lithium ion battery with high energy density according to claim 3, it is characterised in that the temperature of roasting
Spend for 600-750 DEG C, time 2-5h, it is 10-100nm to be crushed to particle diameter.
A kind of 5. high safety type lithium ion battery with high energy density according to claim 1, it is characterised in that negative material
For graphite-like, silicon materials class or alloy anode class material.
6. a kind of high safety type lithium ion battery with high energy density according to claim 1, it is characterised in that barrier film is poly-
Ethene, polypropylene, polyimides or surface are coated with the non-woven fabrics of nano ceramic material.
7. a kind of high safety type lithium ion battery with high energy density according to claim 6, it is characterised in that surface coats
The preparation method for having the non-woven fabrics of nano ceramic material is：Nano ceramic material is injected in by nonwoven using plasma spraying technology
Cloth surface.
A kind of 8. high safety type lithium ion battery with high energy density according to claim 1, it is characterised in that PTC coatings
It is made up of the raw material of following parts by weight：60-90 part PTC matrix materials, 5-20 parts dispersant and 5-20 part binding agents.
A kind of 9. high safety type lithium ion battery with high energy density according to claim 8, it is characterised in that PTC matrixes
Material is BaTiO3、V2O3Or BaPbO3；Dispersant is Triton X-100, polyethylene glycol oxide or polyacrylic acid, is bonded
Agent is Kynoar, polyvinylidene fluoride -co- hexafluoropropene, polyvinylidene fluoride -co- trichloro ethylene, poly- first
Base methyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene -co- vinyl acetate, polycyclic oxygen
Ethane, cellulose acetate, cellulose acetate-butyrate, cellulose-acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinylalcohol,
The one or more kinds of mixture of cyanethyl cellulose, cyanoethyl sucrose, amylopectin, carboxymethyl cellulose.
10. a kind of high safety type lithium ion battery with high energy density according to claim 8 or claim 9, it is characterised in that will be viscous
Knot agent, which is dissolved in solvent, is made adhesive gelatin, and PTC matrix materials, dispersant, adhesive gelatin then are mixed into coating slurry
Material, and is stirred by ultrasonic 30-45min under 65-85 DEG C, 55-65KHz, by obtained coating paste dual coating in positive pole or
In negative lug, vacuum drying obtains.
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| CN201610668167.4A CN107768589A (en) | 2016-08-15 | 2016-08-15 | A kind of high safety type lithium ion battery with high energy density |
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| CN201610668167.4A CN107768589A (en) | 2016-08-15 | 2016-08-15 | A kind of high safety type lithium ion battery with high energy density |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US11894524B2 (en) | 2019-08-08 | 2024-02-06 | Contemporary Amperex Technology Co., Limited | Positive electrode plate, and electrochemical apparatus and device associated therewith |
| CN110429240A (en) * | 2019-08-08 | 2019-11-08 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device comprising same |
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| US12040455B2 (en) | 2019-08-08 | 2024-07-16 | Contemporary Amperex Technology Co., Limited | Electrochemical energy storage apparatus and device |
| US11973196B2 (en) | 2019-08-08 | 2024-04-30 | Contemporary Amperex Technology Co., Limited | Positive electrode plate, and electrochemical apparatus and device associated therewith |
| CN110429241A (en) * | 2019-08-29 | 2019-11-08 | 桑顿新能源科技(长沙)有限公司 | Lithium battery anode and preparation method thereof and lithium battery, power supply system and electrical equipment |
| CN111326739A (en) * | 2020-02-28 | 2020-06-23 | 浙江克能新能源科技有限公司 | Soft-package lithium manganate battery and manufacturing method thereof |
| CN112234313A (en) * | 2020-10-15 | 2021-01-15 | 江苏厚生新能源科技有限公司 | Oxidation-resistant carbon nanotube coating diaphragm and preparation method thereof |
| CN112490586B (en) * | 2020-12-14 | 2022-11-25 | 远景动力技术(江苏)有限公司 | Composite diaphragm with thermal runaway prevention function and lithium ion battery |
| CN112490586A (en) * | 2020-12-14 | 2021-03-12 | 远景动力技术(江苏)有限公司 | Composite diaphragm with thermal runaway prevention function and lithium ion battery |
| CN113394405B (en) * | 2021-05-24 | 2022-07-12 | 西安交通大学 | Preparation method of electrode coating for actively preventing thermal runaway of lithium ion battery |
| CN113394405A (en) * | 2021-05-24 | 2021-09-14 | 西安交通大学 | Preparation method of electrode coating for actively preventing thermal runaway of lithium ion battery |
| CN114497824A (en) * | 2021-12-31 | 2022-05-13 | 北京卫蓝新能源科技有限公司 | Self-adaptive temperature-limiting battery cell based on PTC material, battery system and PTC material |
| CN114497824B (en) * | 2021-12-31 | 2024-03-01 | 北京卫蓝新能源科技有限公司 | Self-adaptive temperature-limiting battery cell based on PTC material, battery system and PTC material |
| CN114899364A (en) * | 2022-06-13 | 2022-08-12 | 蜂巢能源科技(无锡)有限公司 | Negative pole piece and preparation method and application thereof |
| CN114899364B (en) * | 2022-06-13 | 2023-09-12 | 蜂巢能源科技(无锡)有限公司 | Negative electrode plate and preparation method and application thereof |
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