CN109698317A - A kind of high-energy density anode composite sheet lithium ion battery - Google Patents
A kind of high-energy density anode composite sheet lithium ion battery Download PDFInfo
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- CN109698317A CN109698317A CN201811539109.7A CN201811539109A CN109698317A CN 109698317 A CN109698317 A CN 109698317A CN 201811539109 A CN201811539109 A CN 201811539109A CN 109698317 A CN109698317 A CN 109698317A
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- 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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- 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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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of high-energy density anode composite sheet lithium ion batteries, positive plate is compound positive plate, compound positive plate is multi-layer compound structure, positive plate includes plus plate current-collecting body, the back of plus plate current-collecting body is coated with the first positive electrode material layer, the sunny side of plus plate current-collecting body is coated with the second positive electrode material layer, first positive electrode layer surface is coated with third positive electrode material layer, second positive electrode layer surface is coated with the 4th positive electrode material layer, poly-dopamine material layer is coated between first positive electrode material layer and third positive electrode material layer, poly-dopamine material layer is coated between second positive electrode material layer and the 4th positive electrode material layer.Lithium ion battery of the invention has the characteristics that compacted density height, electrochemical performance, easy to process, quality stability is good and low in cost.
Description
Technical field
The present invention relates to technical field of lithium ion, specially a kind of high-energy density anode composite sheet lithium ion electricity
Pond.
Background technique
Lithium ion battery is being a kind of secondary cell (rechargeable battery), it relies primarily on lithium ion between a positive electrode and a negative electrode
Movement carrys out work.In charge and discharge process, Li+ insertion and deintercalation back and forth between two electrodes: when charging, Li+ is de- from anode
It is embedding, it is embedded in cathode by electrolyte, cathode is in lithium-rich state；It is then opposite when electric discharge.
In the electrodes, the compacted density of pole piece is related with the soft or hard of material, pressure, wants generally, for pole coating
Tens nanometers of gap is asked, so as to the wet of electrolyte and enters, facilitates the transmission of ion, and for the sky of a constant volume
Between, compacting is bigger, and capacity is higher.Different batteries needs to select material and processing technology according to performance requirement, controls different
Compacted density, compacted density is excessive, and ion is difficult to transmit, and influences the charge and discharge of battery, and pole piece is easy picking and becomes fragile.
Binder in electrode is for the high-molecular compound by electrode active material adherency on a current collector, mainly
Effect is bonding and keeps active material, enhances the electricity between electrode active material and conductive agent and active material and collector
Son contact, the structure of preferably stable pole piece.Select a kind of suitable lithium ion battery binder, it is desirable that its Ohmic resistance is wanted
Small, performance is stablized in the electrolytic solution, does not expand, not loose, not shedding, it is however generally that, the performance of binder such as cohesive force, flexible
Property, alkali resistance, hydrophily etc., directly affect the performance of battery.Be added optimised quantity binder, can obtain biggish capacity,
Longer cycle life and lower internal resistance to the cycle performance of raising battery, fast charging and discharging ability and reduce battery
Internal pressure etc. has facilitation.Therefore select a kind of suitable binder extremely important.
Existing cylindrical lithium ion battery city off field, cylindrical lithium ion battery is not only that a kind of energy storage is even more to become more
Carry out the important selection of more passenger cars and logistic car.Under this overall situation, the battery for developing a high-energy density is market institute
It needs.
In view of this, Chinese invention patent application CN108899475A discloses a kind of lithium ion battery with high energy density,
The lithium ion battery of the invention includes anode pole piece, cathode pole piece, diaphragm, is coated with positive-active material on the anode pole piece
Expect, negative electrode active material is coated on the cathode pole piece, and the compacted density of the anode pole piece is its limit compacted density
2.4-2.55g/cm3, surface density 360-380g/m2, the compacted density of the cathode pole piece is 1.4-1.50g/ cm3, thickness
It is 115-125 μm.The invention makes anode pole piece reach it in the limit by the reasonable disposition to lithium ion battery plus-negative plate material
Compacted density, and the high power charging-discharging of battery has been effectively ensured under this condition, while improving battery capacity, it effectively improves
Battery performance.
It is improved, is caused active in pole piece by improving compacted density it can be seen that the high-energy density of the invention is unilateral
Excessively fine and close between material grains object, electrolyte permeability is difficult, constrains the performance of battery rate charge-discharge performance；Meanwhile pole
Another hidden danger of piece high compacted density bring is exactly that pole piece brittleness is higher, and part is easy in processing winding process and is broken
Band needs to reprocess, and also forms great material loss waste.
Summary of the invention
The object of the present invention is to provide a kind of high-energy density anode composite sheet lithium ion battery, high with compacted density,
Electrochemical performance, feature easy to process, quality stability is good and low in cost.
The present invention can be achieved through the following technical solutions:
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
By the way that compound positive plate, the first positive electrode material layer being in contact with each other, the second positive electrode material layer, third anode is arranged
Material layer, the 4th positive electrode material layer have different partial sizes big due to being different active material, different active material particles
It is small to forming reasonable density gradient, in nipping process, the gap between sphere and sphere can be due between density gradient
Difference will form stress, to tie up the gap between sphere and sphere, effectively improve the compacted density of battery, improve
The energy density of battery.
By being provided with poly-dopamine material layer, the lithium ion metal oxide particle surface of poly-dopamine cladding is existing
Effect plays the organic compatibility of itself and electrolyte solvent, improves the permeability of electrolyte, and greatly reduce electrolyte just
Oxygenolysis in the material layer of pole then reduces the amount of migration of the oxidation product to cathode pole piece, provides lithium ion significantly
The high temperature storing performance and cycle performance of battery are also fully utilized by the excellent advantage of its adhesion property, adjacent to each other
One positive electrode material layer, the second positive electrode material layer, third positive electrode material layer, the 4th positive electrode material layer adhesive bond are formed compound
Positive plate；In addition, poly-dopamine as elastic conduction composite material, can not only alleviate stress of the positive plate in nipping process
Crisp chip caused by high compacted density, also formation three-dimensional conductive network are avoided, the high rate performance of lithium ion battery is further promoted, follows
Ring performance, processing performance.
For the present invention, in the process of positive plate, although positive plate using composite structured, preparation
Process is only that other two positive electrode material layer is added in traditional three-decker, realizes the promotion of performance hurriedly, entire to add
Without reequiping to existing equipment, each positive electrode stirring technique mature before directlying adopt carries out work process, it is only necessary to
Repeat the coating of other positive electrode material layer, simplifies process；Using positive plate of the invention, high-energy is being realized
The colleague of density, positive plate still have certain toughness, and brittleness is greatly lowered, during coiling process, positive plate part
Or belt phenomenon will not occur substantially, be advantageously implemented continuous rolling ' the continuous slitting scraps of paper, auto reeling molding, improve
The stability and consistency of lithium lithium battery quality；High-energy density anode composite piece is carried out using the process equipment of lithium ion battery
Lithium ion battery, structure design is simple, and technical operation flow simplifies, and mass production is high-efficient, and material loss is low, is effectively reduced
The manufacturing cost of lithium ion battery.
Further, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine material
The bed of material is more advantageous to the chemical property and processing performance for promoting lithium ion battery.
Further, the width of first positive electrode material layer is greater than second positive electrode material layer, second anode
The width of material layer is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is greater than
The real density of the second positive electrode material layer positive electrode active materials；Guarantee to form density gradient between adjacent positive electrode material layer,
To which the promotion of compacted density in nipping process be effectively ensured, to improve energy density.
Further, the active positive electrode material of first positive electrode material layer is LiMn2O4, LiFePO4, ternary nickel cobalt manganese
Sour lithium or cobalt acid lithium；The active positive electrode material of second positive electrode material layer is LiMn2O4, LiFePO4, ternary nickle cobalt lithium manganate
Or cobalt acid lithium.Different active material types is selected according to practical application, not only ensure that high-energy density, but also meets different answer
Use scene.
Further, the plus plate current-collecting body is aluminium foil, and the aluminium foil includes smooth surface aluminium foil, hair side aluminium foil or coating aluminium
Foil；It selects according to actual needs, meets the needs of process flexibility and production cost
Further, the diaphragm is PE diaphragm, PP diaphragm or PE/PP composite diaphragm, is selected according to practical application, meets capacity
The processing of type or rate lithium ion battery needs.
Further, the diaphragm is ceramic-coated separator, gives full play to ceramic diaphragm in the advantage of high-multiplying-power battery, system
The standby lithium ion battery having compared with excellent electrochemical performance.
Further, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and is coated in negative
The negative electrode material layer of pole the collector back and sunny side.Manufacture needs can be met at maturity processing technique using existing, reduce processing
Cost.
Further, the mol ratio of the nickel cobalt manganese in the cobalt nickel lithium manganate ternary material is 5:2:3,6:2:2 or 8:
1:1.It selects according to actual needs, every kind of material is all stirred and is coated with respectively, avoids different processing technologys to other materials
Performance performance impacts.
Further, the positive plate by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.
Further, the positive plate, negative electrode tab and diaphragm are spaced apart from each other stacking and form square structure.
A kind of high-energy density anode composite sheet lithium ion battery of the present invention, have it is following the utility model has the advantages that
The first, compacted density is high, by the way that compound positive plate, the first positive electrode material layer being in contact with each other, the second positive material is arranged
The bed of material, third positive electrode material layer, the 4th positive electrode material layer have due to being different active material, different active material particles
Different particle size is to form reasonable density gradient, and in nipping process, gap between sphere and sphere can be due to
Difference between density gradient will form stress, to tie up the gap between sphere and sphere, effectively improve the pressure of battery
Real density improves the energy density of battery；
The second, electrochemical performance, by being provided with poly-dopamine material layer, the lithium ion metal oxidation of poly-dopamine cladding
Composition granule surface both effectively plays the organic compatibility of itself and electrolyte solvent, improves the permeability of electrolyte, and greatly
Oxygenolysis of the electrolyte on positive electrode material layer is reduced, then reduces the amount of migration of the oxidation product to cathode pole piece, significantly
Ground provides the high temperature storing performance and cycle performance of lithium ion battery, is also fully utilized by the excellent advantage of its adhesion property,
The first positive electrode material layer adjacent to each other, the second positive electrode material layer, third positive electrode material layer, the 4th positive electrode material layer adherency knot
It closes, forms compound positive plate；In addition, poly-dopamine as elastic conduction composite material, can not only alleviate positive plate in roller
Stress during pressure avoids crisp chip caused by high compacted density, also formation three-dimensional conductive network, further promotes lithium-ion electric
The high rate performance in pond, cycle performance, processing performance；
It is third, easy to process, in the process of positive plate, although positive plate using composite structured, preparation process
It is only to add other two positive electrode material layer in traditional three-decker, realizes the promotion of performance hurriedly, it is entire processed
Cheng Wuxu reequips existing equipment, and each positive electrode stirring technique mature before directlying adopt carries out, it is only necessary to repeat
The coating of other positive electrode material layer is carried out, process is simplified；
4th, quality stability is good, and using positive plate of the invention, in the colleague for realizing high-energy density, positive plate still has
There is certain toughness, brittleness is greatly lowered, and during coiling process, positive plate part or belt phenomenon will not be sent out substantially
It is raw, be advantageously implemented continuous rolling ' the continuous slitting scraps of paper, auto reeling molding, improve lithium lithium battery quality stability and
Consistency；
5th, low in cost, high-energy density anode composite sheet lithium ion battery is carried out using the process equipment of lithium ion battery,
Structure design is simple, and technical operation flow simplifies, and mass production is high-efficient, and material loss is low, effectively reduces lithium-ion electric
The manufacturing cost in pond.
Specific embodiment
In order that those skilled in the art will better understand the technical solution of the present invention, below with reference to embodiment to this hair
Bright product is described in further detail.
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and every
Film, the positive plate, negative electrode tab and diaphragm, which are spaced apart from each other, winds or laminates design, and the diaphragm is arranged in positive plate and negative electrode tab
Between, the positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes just
Pole collector, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, the sunny side coating of the plus plate current-collecting body
There is the second positive electrode material layer, the first positive electrode layer surface is coated with third positive electrode material layer, second positive electrode
Layer surface is coated with the 4th positive electrode material layer, is coated with poly- DOPA between first positive electrode material layer and third positive electrode material layer
Amine material layer is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, described
First positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer with it is described
The positive electrode active materials of third positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and described second are just
The active positive electrode material of pole material layer is different.
Further, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine material
The bed of material.
Further, the width of first positive electrode material layer is greater than second positive electrode material layer, second anode
The width of material layer is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is greater than
The real density of the second positive electrode material layer positive electrode active materials.
Further, the active positive electrode material of first positive electrode material layer is LiMn2O4, LiFePO4, ternary nickel cobalt manganese
Sour lithium or cobalt acid lithium；The active positive electrode material of second positive electrode material layer is LiMn2O4, LiFePO4, ternary nickle cobalt lithium manganate
Or cobalt acid lithium.
Further, the plus plate current-collecting body is aluminium foil, and the aluminium foil includes smooth surface aluminium foil, hair side aluminium foil or coating aluminium
Foil.
Further, the diaphragm is PE diaphragm, PP diaphragm or PE/PP composite diaphragm.
Further, the diaphragm is ceramic-coated separator.
Further, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and is coated in negative
The negative electrode material layer of pole the collector back and sunny side.
Further, the mol ratio of the nickel cobalt manganese in the cobalt nickel lithium manganate ternary material is 5:2:3,6:2:2 or 8:
1:1
Further, the positive plate by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.
Further, the positive plate, negative electrode tab and diaphragm are spaced apart from each other stacking and form square structure.
Embodiment 1
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
In this embodiment, the width of first positive electrode material layer is greater than second positive electrode material layer, and described second just
The width of pole material layer is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is big
In the real density of the second positive electrode material layer positive electrode active materials.
In the present embodiment, the active positive electrode material of first positive electrode material layer is LiMn2O4；Described second positive material
The active positive electrode material of the bed of material is ternary nickle cobalt lithium manganate.The plus plate current-collecting body is aluminium foil, and the aluminium foil is smooth surface aluminium foil.Institute
Stating diaphragm is PE diaphragm.
In the present embodiment, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and coating
In the negative electrode material layer of the negative current collector back and sunny side.
In the present embodiment, the mol ratio of the nickel cobalt manganese in the cobalt nickel lithium manganate ternary material is 5:2:3
In the present embodiment, the positive plate by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.Institute
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other stacking and form square structure.
Embodiment 2
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
In this embodiment, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine
Material layer.The width of first positive electrode material layer is greater than second positive electrode material layer, the width of second positive electrode material layer
Degree is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is being greater than described second just
The real density of pole material layer positive electrode active materials.
In the present embodiment, the active positive electrode material of first positive electrode material layer is cobalt acid lithium；Described second positive material
The active positive electrode material of the bed of material is ternary nickle cobalt lithium manganate.The plus plate current-collecting body is aluminium foil, and the aluminium foil includes hair side aluminium foil.
The diaphragm is PP diaphragm.
In the present embodiment, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and coating
In the negative electrode material layer of the negative current collector back and sunny side.
In the present embodiment, the mol ratio of the nickel cobalt manganese in the cobalt nickel lithium manganate ternary material is 6:2:2
In the present embodiment, the positive plate by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.Institute
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other stacking and form square structure.
Embodiment 3
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
In this embodiment, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine
Material layer.The width of first positive electrode material layer is greater than second positive electrode material layer, the width of second positive electrode material layer
Degree is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is being greater than described second just
The real density of pole material layer positive electrode active materials.
In the present embodiment, the active positive electrode material of first positive electrode material layer is LiFePO4；Second anode
The active positive electrode material of material layer is ternary nickle cobalt lithium manganate.The plus plate current-collecting body is aluminium foil, and the aluminium foil is coated aluminum foil.
The diaphragm is PE/PP composite diaphragm.
In the present embodiment, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and coating
In the negative electrode material layer of the negative current collector back and sunny side.
In the present embodiment, the mol ratio of the nickel cobalt manganese in the cobalt nickel lithium manganate ternary material is 8:1:1
In the present embodiment, the positive plate by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.Institute
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other stacking and form square structure.
Embodiment 4
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
In this embodiment, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine
Material layer.The width of first positive electrode material layer is greater than second positive electrode material layer, the width of second positive electrode material layer
Degree is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is being greater than described second just
The real density of pole material layer positive electrode active materials.
In the present embodiment, the active positive electrode material of first positive electrode material layer is 532 ternary nickle cobalt lithium manganates；It is described
The active positive electrode material of second positive electrode material layer is 811 ternary nickle cobalt lithium manganates or cobalt acid lithium.The plus plate current-collecting body is aluminium foil,
The Aluminium Foil Package is coated aluminum foil.The diaphragm is PE diaphragm, PP diaphragm or PE/PP composite diaphragm.The diaphragm is that ceramics apply
Layer diaphragm.
In the present embodiment, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and coating
In the negative electrode material layer of the negative current collector back and sunny side.
In the present embodiment, the positive plate by being coated with by several times or repeatedly, then static pressure or milling train hot pressing.
Embodiment 5
The invention discloses a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, institutes
It states positive plate, negative electrode tab and diaphragm and is spaced apart from each other and wind or laminate design, the diaphragm is arranged between positive plate and negative electrode tab,
The positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode collection
Fluid, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with the
Two positive electrode material layers, the first positive electrode layer surface are coated with third positive electrode material layer, the second positive electrode material layer table
Face is coated with the 4th positive electrode material layer, is coated with poly-dopamine material between first positive electrode material layer and third positive electrode material layer
The bed of material, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described first
Positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and the third
The positive electrode active materials of positive electrode material layer are identical；The positive electrode active materials of first positive electrode material layer and the second positive material
The active positive electrode material of the bed of material is different.
In this embodiment, the third positive electrode material layer and the 4th positive electrode layer surface are also coated with poly-dopamine
Material layer.The width of first positive electrode material layer is greater than second positive electrode material layer, the width of second positive electrode material layer
Degree is less than the 4th positive electrode material layer, and the real density of the first positive electrode material layer positive electrode active materials is being greater than described second just
The real density of pole material layer positive electrode active materials.
In the present embodiment, the active positive electrode material of first positive electrode material layer is LiMn2O4；Described second positive material
The active positive electrode material of the bed of material is cobalt acid lithium.The plus plate current-collecting body is aluminium foil, and the aluminium foil is coated aluminum foil.The diaphragm is
Ceramic-coated separator.
In the present embodiment, the negative electrode tab is three-layer composite structure, and the negative electrode tab includes negative current collector and coating
In the negative electrode material layer of the negative current collector back and sunny side.
In the present embodiment, the positive plate is by by several times or repeatedly coating, then static pressure or milling train hot pressing mode at
Type.The positive plate, negative electrode tab and diaphragm are spaced apart from each other stacking and form square structure.
Comparative example 1
Comparative example 1 is with embodiment 2 only difference is that ternary nickle cobalt lithium manganate is replaced with LiFePO 4 material.
Comparative example 2
Comparative example 2 and embodiment 2 are only difference is that LiFePO 4 material is replaced with ternary nickle cobalt lithium manganate.
For the ease of the performance of comparative cell, embodiment 3, comparative example 1, comparative example 3 are prepared using existing mature technology
18650 type cylindrical batteries are obtained to be tested for the property.For the ease of comparing the difference of compacted density, the compacting evil spirit of lamination layer structure
All tested using the active material of specific layer.The results are shown in Table 1 for dependence test:
1 the performance test results of table
| Embodiment 3 | Comparative example 1 | Comparative example 2 | |
| LFP compacted density (g/cm3) | 1.63 | / | 1.56 |
| NCM compacted density (g/cm3) | 3.23 | 3.13 | / |
| 1C recycles 100 weeks conservation rates (%) | 97 | 92 | 96 |
| 1C recycles 500 weeks conservation rates (%) | 90 | 75 | 86 |
| 1C:0.5C discharge capacitance (%) | 98.9 | 95.3 | 97.5 |
| 5C:0.5C discharge capacitance (%) | 92.3 | 88.6 | 78.3 |
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the present invention in any form；All current rows
The those of ordinary skill of industry can be shown in by specification and described above and swimmingly implement the present invention；But all to be familiar with sheet special
The technical staff of industry without departing from the scope of the present invention, makes a little using disclosed above technology contents
Perhaps the equivalent variations of variation, modification and evolution is equivalent embodiment of the invention；Meanwhile all substantive skills according to the present invention
Art to above embodiments 9 make any equivalent variationss variation, modification and evolution etc., still fall within technical solution of the present invention
Protection scope within.
Claims (10)
1. a kind of high-energy density anode composite sheet lithium ion battery, including positive plate, negative electrode tab and diaphragm, the positive plate,
Negative electrode tab and diaphragm, which are spaced apart from each other, winds or laminates design, and the diaphragm is arranged between positive plate and negative electrode tab, and feature exists
In: the positive plate is compound positive plate, and the compound positive plate is multi-layer compound structure, and the positive plate includes anode
Collector, the back of the plus plate current-collecting body are coated with the first positive electrode material layer, and the sunny side of the plus plate current-collecting body is coated with
Second positive electrode material layer, the first positive electrode layer surface are coated with third positive electrode material layer, second positive electrode material layer
Surface is coated with the 4th positive electrode material layer, is coated with poly-dopamine between first positive electrode material layer and third positive electrode material layer
Material layer, is coated with poly-dopamine material layer between second positive electrode material layer and the 4th positive electrode material layer, and described
One positive electrode material layer is identical as the positive electrode active materials of the 4th positive electrode material layer, second positive electrode material layer and described the
The positive electrode active materials of three positive electrode material layers are identical；The positive electrode active materials of first positive electrode material layer and second anode
The active positive electrode material of material layer is different.
2. high-energy density anode composite sheet lithium ion battery according to claim 1, it is characterised in that: the third is just
Pole material layer and the 4th positive electrode layer surface are also coated with poly-dopamine material layer.
3. high-energy density anode composite sheet lithium ion battery according to claim 2, it is characterised in that: described first just
The width of pole material layer is greater than second positive electrode material layer, and the width of second positive electrode material layer is less than the 4th anode
The real density of material layer, the first positive electrode material layer positive electrode active materials is greater than the second positive electrode material layer positive-active material
The real density of material.
4. high-energy density anode composite sheet lithium ion battery according to claim 3, it is characterised in that: described first just
The active positive electrode material of pole material layer is LiMn2O4, LiFePO4, ternary nickle cobalt lithium manganate or cobalt acid lithium；Described second positive material
The active positive electrode material of the bed of material is LiMn2O4, LiFePO4, ternary nickle cobalt lithium manganate or cobalt acid lithium.
5. high-energy density anode composite sheet lithium ion battery according to claim 4, it is characterised in that: the anode collection
Fluid is aluminium foil, and the aluminium foil includes smooth surface aluminium foil, hair side aluminium foil or coated aluminum foil.
6. high-energy density anode composite sheet lithium ion battery according to claim 5, it is characterised in that: the diaphragm is
PE diaphragm, PP diaphragm or PE/PP composite diaphragm.
7. high-energy density anode composite sheet lithium ion battery according to claim 5, it is characterised in that: the diaphragm is
Ceramic-coated separator.
8. being existed according to claim 6 or high-energy density anode composite sheet lithium ion battery as claimed in claim 7, feature
In: the negative electrode tab be three-layer composite structure, the negative electrode tab include negative current collector and be coated in the negative current collector back and
The negative electrode material layer of sunny side.
9. high-energy density anode composite sheet lithium ion battery according to claim 8, it is characterised in that: the nickel cobalt manganese
The mol ratio of nickel cobalt manganese in sour lithium ternary material is 5:2:3,6:2:2 or 8:1:1.
10. high-energy density anode composite sheet lithium ion battery according to claim 9, it is characterised in that: the anode
Piece by being coated with by several times or repeatedly, then static pressure or the molding of milling train hot pressing mode.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036076A (en) * | 2021-02-25 | 2021-06-25 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| CN113241477A (en) * | 2021-05-07 | 2021-08-10 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114284568A (en) * | 2021-12-29 | 2022-04-05 | 蜂巢能源科技(无锡)有限公司 | Preparation method and system of battery cell, battery cell and battery |
| CN116722102A (en) * | 2023-08-07 | 2023-09-08 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, preparation method, battery cell, battery and electricity utilization device |
| WO2023212867A1 (en) * | 2022-05-05 | 2023-11-09 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, electrode assembly, battery cell, battery, and electrical device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635344A (en) * | 2008-07-24 | 2010-01-27 | 东莞新能源科技有限公司 | Anode pole piece of secondary lithium ion battery and preparation method thereof |
| CN104600244A (en) * | 2014-12-29 | 2015-05-06 | 惠州市恒泰科技有限公司 | Multilayer positive plate, production method of positive plate and lithium ion battery |
| CN105118958A (en) * | 2015-08-13 | 2015-12-02 | 深圳市三讯电子有限公司 | Positive electrode plate and preparing method thereof and lithium ion battery |
| KR20170054052A (en) * | 2015-11-09 | 2017-05-17 | 삼성에스디아이 주식회사 | Positive electrode for lithium secondary battery, preparing method thereof, and lithium secondary battery comprising the same |
| CN107482166A (en) * | 2017-07-03 | 2017-12-15 | 深圳市比克动力电池有限公司 | A kind of lithium ion battery |
| CN109004175A (en) * | 2018-02-26 | 2018-12-14 | 宁德新能源科技有限公司 | Anode pole piece and lithium ion battery |
-
2018
- 2018-12-17 CN CN201811539109.7A patent/CN109698317A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635344A (en) * | 2008-07-24 | 2010-01-27 | 东莞新能源科技有限公司 | Anode pole piece of secondary lithium ion battery and preparation method thereof |
| CN104600244A (en) * | 2014-12-29 | 2015-05-06 | 惠州市恒泰科技有限公司 | Multilayer positive plate, production method of positive plate and lithium ion battery |
| CN105118958A (en) * | 2015-08-13 | 2015-12-02 | 深圳市三讯电子有限公司 | Positive electrode plate and preparing method thereof and lithium ion battery |
| KR20170054052A (en) * | 2015-11-09 | 2017-05-17 | 삼성에스디아이 주식회사 | Positive electrode for lithium secondary battery, preparing method thereof, and lithium secondary battery comprising the same |
| CN107482166A (en) * | 2017-07-03 | 2017-12-15 | 深圳市比克动力电池有限公司 | A kind of lithium ion battery |
| CN109004175A (en) * | 2018-02-26 | 2018-12-14 | 宁德新能源科技有限公司 | Anode pole piece and lithium ion battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036076A (en) * | 2021-02-25 | 2021-06-25 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| CN113241477A (en) * | 2021-05-07 | 2021-08-10 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114284568A (en) * | 2021-12-29 | 2022-04-05 | 蜂巢能源科技(无锡)有限公司 | Preparation method and system of battery cell, battery cell and battery |
| CN114284568B (en) * | 2021-12-29 | 2023-07-25 | 蜂巢能源科技(无锡)有限公司 | Preparation method and system of battery cell, battery cell and battery |
| WO2023212867A1 (en) * | 2022-05-05 | 2023-11-09 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, electrode assembly, battery cell, battery, and electrical device |
| CN116722102A (en) * | 2023-08-07 | 2023-09-08 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, preparation method, battery cell, battery and electricity utilization device |
| CN116722102B (en) * | 2023-08-07 | 2024-05-28 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, preparation method, battery cell, battery and electricity utilization device |
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Application publication date: 20190430 |