CN106099080A - A kind of lithium ion battery based on NCM trielement composite material and preparation method thereof - Google Patents
A kind of lithium ion battery based on NCM trielement composite material and preparation method thereof Download PDFInfo
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- CN106099080A CN106099080A CN201610739669.1A CN201610739669A CN106099080A CN 106099080 A CN106099080 A CN 106099080A CN 201610739669 A CN201610739669 A CN 201610739669A CN 106099080 A CN106099080 A CN 106099080A
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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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
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a kind of lithium ion battery based on NCM trielement composite material and preparation method thereof, described lithium ion battery includes positive pole, negative pole, barrier film and electrolyte, containing NCM ternary material and lithium ferric manganese phosphate in anode sizing agent；The particle diameter D50=4.5 of iron manganese phosphate for lithium～10.0 μm, D90=10.0～19.0 microns；The particle diameter D50=5.0 of ternary material～10.0 μm, D90=1.0～18.0 μm；Possibly together with the conductive agent of >=1wt% in anode sizing agent.Negative material is material with carbon element, D50≤10 μm, D90≤160 μm, conductive agent >=1.5%.After both positive and negative polarity pole piece respectively roll-in, introduce ceramic diaphragm and be prepared as battery；Load in battery case, inject electrolyte after drying, be prepared as lithium ion battery.Lithium ion battery security prepared by the present invention is good, have extended cycle life, energy density height, high/low temperature strong adaptability, the most forthright excellence.
Description
Technical field
The present invention relates to technical field of lithium ion, be specifically related to a kind of lithium ion based on NCM trielement composite material
Battery technology.
Background technology
Energy density is high, discharge voltage is relatively stable, memory-less effect, operating temperature range owing to having for lithium ion battery
Wide, pollution-free, have extended cycle life, the plurality of advantages such as security performance is good, since coming out, be widely used to mobile communications tool
And in the portable electric appts such as camera, notebook.Development and the enhancing of people's environmental consciousness, lithium ion two along with society
Primary cell is applied in increasing field, such as new-energy automobile, energy storing devices, intelligence equipment etc.；But, current technology is come
Seeing, generally there is the problems such as capacity is low, battery durable mileage is short, charging interval length in lithium ion battery, it is difficult to meets consumer pair
The demand that battery uses, needs the lithium ion battery of exploitation high specific energy badly.
The development of the energy density of the lithium ion battery of high specific energy, security performance, cycle life and multiplying power discharging etc. is main
It is limited to positive electrode.Wherein ternary material has the advantages that discharge voltage plateau is high, gram volume is big, is exploitation high specific energy batteries
Preferred material, but compared with the material of LiFePO4 olivine structural, the safety of ternary material is the most on the low side；Meanwhile, three
The cycle life of unit's material cell is the most far away not as good as lithium iron battery material.
It addition, the covering plate structure that most batteries use, both positive and negative polarity tab welding pin is positioned at side, and conveyance capacity has
Easily cause inside battery CURRENT DISTRIBUTION when limit and big multiplying power discharging uneven, cause the charging interval long, and easily produce local mistake
Thermal initiation potential safety hazard.
Summary of the invention
First to be solved by this invention technical problem is that: the deficiency existed for prior art, it is provided that one is passed through
Use olivine structural material and spinel structure material to carry out mix designs anode, reach reinforcing material stability and
Battery security and the lithium ion battery based on NCM trielement composite material of high rate charge-discharge effect.
Second to be solved by this invention technical problem is that: the deficiency existed for prior art, it is provided that a kind of based on
The preparation method of the lithium ion battery of NCM trielement composite material, by using olivine structural material brilliant with point to anode
Stone structure material carries out mix designs, and the battery of preparation has reached reinforcing material stability and improved the effect of battery security；
By aligning, negative material be optimized matched design, reached to improve battery high rate charge-discharge performance and cycle life
Effect.
For solving above-mentioned first technical problem, the technical scheme is that
A kind of lithium ion battery based on NCM trielement composite material, the positive pole of described lithium ion battery include positive plate and
The anode sizing agent being coated on positive plate, containing the NCM ternary material that mass ratio is 50～85:50～15 in described anode sizing agent
And lithium ferric manganese phosphate；The particle diameter D50=4.5 of described lithium ferric manganese phosphate～10.0 μm, D90=10.0～19.0 μm；Described ternary
The particle diameter D50=5.0 of material～10.0 μm, D90=1.0～18.0 μm；Possibly together with the conduction of >=1wt% in described anode sizing agent
Agent.
As the preferred technical scheme of one, described anode sizing agent solvent for use is NMP, solid-to-liquid ratio in described anode sizing agent
It is 0.5～1.25:1.
As the preferred technical scheme of one, described positive plate is aluminium foil；The anode sizing agent being coated on positive plate double
Topcoating cloth density is 30～40mg/cm2；Compacted density is 2.5～3.0g/cm3。
As the preferred technical scheme of one, the negative pole of described lithium ion battery includes negative plate and is coated on negative plate
Cathode size, containing material with carbon element in described cathode size, D50≤10 μm of described material with carbon element, D90≤160 μm；Described negative pole
In slurry possibly together with >=1.5% conductive agent.
As further preferred technical scheme, described material with carbon element is artificial graphite-like material with carbon element.
As the preferred technical scheme of one, described negative plate is Copper Foil；The cathode size being coated on negative plate double
Topcoating cloth density is 13～17mg/cm2, compacted density is 1.35～1.75g/cm3。
As the technical scheme of a kind of improvement, described conductive agent is two in Graphene, CNT, super-p, KS-6
Plant or two or more mixture；And the conductive agent of described anode sizing agent must contain CNT or Graphene, described nano-sized carbon
Pipe or the consumption >=0.5wt% of Graphene.
As the technical scheme of a kind of improvement, described lithium ion battery also includes electrolyte, is added with in described electrolyte
LiPF6 and vinylene carbonate.
As the technical scheme of a kind of improvement, between the both positive and negative polarity of described lithium ion battery, it is provided with high-strength barrier film, described height
Strong barrier film is the barrier film of single or double coating alumina or silicon dioxide.
As the technical scheme of a kind of improvement, on described lithium ion battery cover board, positive and negative electrode tab welding pin is positioned at lid
Plate both sides.
For solving above-mentioned second technical problem, the technical scheme is that
The preparation method of a kind of lithium ion battery based on NCM trielement composite material, comprises the following steps:
(1) anode sizing agent is prepared: under stirring, by NCM ternary material that mass ratio is 50～85:50～15 and phosphoric acid
Ferrimanganic lithium is dissolved in solvent NMP, the conductive agent of addition >=1wt%, uniform through high speed dispersion, is prepared as anode sizing agent, solid-liquid
Ratio is 0.5～1.25:1.The particle diameter D50=4.5 of described lithium ferric manganese phosphate～10.0 μm, D90=10.0～19.0 μm；Described three
The particle diameter D50=5.0 of unit's material～10.0 μm, D90=1.0～18.0 μm.
(2) preparing positive pole and negative pole: be coated on aluminium foil by anode sizing agent, double spread density is 30～40mg/cm2；
Compacted density is 2.5～3.0g/cm3, it is prepared as positive pole；Copper Foil will be coated on containing the cathode size of material with carbon element and conductive agent
On, double spread density is 13～17mg/cm2, compacted density is 1.35～1.75g/cm3, it is prepared as negative pole.Described material with carbon element
D50≤10 μm, D90≤160 μm.
(3) battery is prepared: after the roll-in respectively of positive pole, negative pole, introduce single or double coating alumina or titanium dioxide
The high-strength barrier film of silicon, described high-strength membrane thicknesses is 10～25 μm；It is prepared as battery by the way of winding or lamination.
(4) battery assembling: battery is welded on positive and negative electrode welding pin and is positioned on the battery cover board of both sides, and load
In battery case, inject electrolyte, described electrolyte is added with LiPF6 and vinylene carbonate, be then passed through chemical conversion, sealing of hole,
Partial volume step is prepared as lithium ion battery.
As the technical scheme of a kind of improvement, the particle diameter D50=4.5 of described lithium ferric manganese phosphate～10.0 μm, D90=10.0
～19.0 μm；The particle diameter D50=5.0 of described ternary material～10.0 μm, D90=1.0～18.0 μm；.
As the technical scheme of a kind of improvement, described conductive agent is two in Graphene, CNT, super-p, KS-6
Plant or two or more mixture；And the conductive agent of described anode sizing agent must contain CNT or Graphene, described nano-sized carbon
Pipe or the consumption >=0.5wt% of Graphene.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
The lithium ion battery of the present invention, in anode sizing agent containing mass ratio be 50～85:50～15 NCM ternary material and
Lithium ferric manganese phosphate；The particle diameter D50=4.5 of described lithium ferric manganese phosphate～10.0 μm, D90=10.0～19.0 μm；Described ternary material
The particle diameter D50=5.0 of material～10.0 μm, D90=1.0～18.0 μm；By ternary material and the high voltage bearing olive of spinel structure
Olive stone structure material carries out compounding ingredient, lithium ferric manganese phosphate and the ternary material of most suitable particle diameter ratio is mixed according to a certain percentage
Close uniformly, improve battery security, the battery capacity height of preparation after batch mixing, good rate capability.
The negative pole of the lithium ion battery of the present invention uses the relatively low elliposoidal of particle diameter or lamellar Delanium class material with carbon element, lithium
Ion battery embeds abjection excellent performance, and can ensure battery integral heat sink performance, is appropriate to big multiplying power charge and discharge.
The present invention uses containing Graphene or the multiple conductive agent of CNT, and according to its physical property and space structure
Carrying out different proportion collocation, the conductive network framework making system is more reasonable, thus improves the electric conductivity of electrode, it is ensured that electrode
Heavy-current discharge and conduction of heat and diffusivity.
The present invention carries out mix designs also to anode by olivine structural material and spinel structure material, introduces
High pressure resistant electrolyte and the high-strength barrier film with ceramic coating, strengthen battery security, when energy density is more than 180Wh/kg,
The safety test that can be destroyed by force by acupuncture, extruding etc..
The cover plate both positive and negative polarity tab welding pin that the present invention uses lays respectively at the battery left and right sides, and pin sectional area is very
Greatly, conveyance capacity >=6C, it is appropriate to big multiplying power charge and discharge, it is ensured that battery safety in 10 minutes is fully charged.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is particle distribution pattern after positive plate of the present invention coating；
The formation charge-discharge curve chart of Fig. 2 battery；
High and low, the room temperature charge and discharge curve chart of Fig. 3 battery；
The multiplying power discharging property block diagram of Fig. 4 battery；
The cycle performance scattergram of Fig. 5 battery.
In figure, Fig. 1 is the particle distribution pattern after positive plate is coated with under 1000 power microscopes.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the present invention is expanded on further.Should be understood that these embodiments are merely to illustrate this
Bright rather than limit the scope of the present invention.In addition, it is to be understood that after having read the content that the present invention lectures, art technology
The present invention can be made various changes or modifications by personnel, and these equivalent form of values fall within the application appended claims equally and limited
Fixed scope.
Embodiment 1
A kind of lithium ion battery based on NCM trielement composite material, including positive pole, negative pole, barrier film and electrolyte, positive pole,
Being provided with the high-strength barrier film of the one side coating silicon dioxide that thickness is 20 μm between negative pole, described positive pole includes aluminium foil and is coated on aluminum
Anode sizing agent on paper tinsel, anode sizing agent is that NCM ternary material and lithium ferric manganese phosphate that mass ratio is 85:15 are dissolved in solvent
In NMP；The particle diameter D50=6.0 μm of described lithium ferric manganese phosphate, D90=11.0 μm；The particle diameter D50=9.5 μ of described ternary material
M, D90=8.0 μm；Possibly together with the Graphene of Super-p and 1wt% of 2wt% in described anode sizing agent；In described anode sizing agent
Solid-to-liquid ratio is 1:1；The double spread density of anode sizing agent is 30mg/cm2；Compacted density is 2.5g/cm3.In described anode sizing agent
Solid-to-liquid ratio is 2:3.The negative pole of described lithium ion battery includes Copper Foil and the cathode size being coated on Copper Foil, described cathode size
In containing material with carbon element, the D50 of described material with carbon element be 8 μm, D90 be 140 μm；Possibly together with 3wt%'s in described cathode size
Super-p.The double spread density of cathode size is 13mg/cm2, compacted density is 1.35g/cm3.Described electrolyte adds
There are LiPF6 and vinylene carbonate.
Embodiment 2
A kind of lithium ion battery based on NCM trielement composite material, including positive pole, negative pole, barrier film and electrolyte, positive pole,
Being provided with the high-strength barrier film of the dual coating silicon dioxide that thickness is 20 μm between negative pole, described positive pole includes aluminium foil and is coated on aluminum
Anode sizing agent on paper tinsel, anode sizing agent is that NCM ternary material and lithium ferric manganese phosphate that mass ratio is 80:20 are dissolved in solvent
In NMP；The particle diameter D50=6.5 μm of described lithium ferric manganese phosphate, D90=13.0 μm；The particle diameter D50=6.0 μ of described ternary material
M, D90=9.0 μm；Possibly together with the Graphene of Super-p and 1wt% of 1wt% in described anode sizing agent；In described anode sizing agent
Solid-to-liquid ratio is 1:1；The double spread density of anode sizing agent is 36mg/cm2；Compacted density is 3.0g/cm3.Described lithium ion battery
Negative pole include Copper Foil and the cathode size being coated on Copper Foil, containing Delanium carbon in described cathode size, described artificial
The D50 of graphitic carbon be 10 μm, D90 be 130 μm；Possibly together with the SK-of Super-p and 1.5wt% of 2wt% in described cathode size
6；The double spread density of cathode size is 16.5mg/cm2, compacted density is 1.4g/cm3.Described electrolyte is added with
LiPF6 and vinylene carbonate.
Embodiment 3
A kind of lithium ion battery based on NCM trielement composite material, including positive pole, negative pole and electrolyte, positive pole, negative pole it
Between be provided with the high-strength barrier film that thickness is 15 μm dual coating aluminium oxidies, described positive pole includes aluminium foil and the positive pole being coated on aluminium foil
Slurry, anode sizing agent is NCM ternary material and lithium ferric manganese phosphate that mass ratio is 75:25 to be dissolved in solvent NMP；Described phosphorus
Acid the particle diameter D50=8.0 μm of ferrimanganic lithium, D90=15.0 μm；The particle diameter D50=7.5 μm of described ternary material, D90=12.5 μ
m；Possibly together with the CNT of Super-p and 1.5wt% of 1wt% in described anode sizing agent；Solid-to-liquid ratio in described anode sizing agent
For 2:3；The double spread density of anode sizing agent is 35mg/cm2；Compacted density is 2.6g/cm3.The negative pole of described lithium ion battery
Including Copper Foil and the cathode size being coated on Copper Foil, containing Delanium carbon in described cathode size, described Delanium carbon
D50 be 8.7 μm, D90 be 120 μm；Possibly together with the SK-6 of Super-p and 1.5wt% of 2wt% in described cathode size；Negative
The double spread density of pole slurry is 16.8mg/cm2, compacted density is 1.5g/cm3.Described electrolyte is added with LiPF6 and
Vinylene carbonate.
Embodiment 4
A kind of lithium ion battery based on NCM trielement composite material, including positive pole, negative pole and electrolyte, positive pole, negative pole it
Between be provided with the high-strength barrier film that thickness is 15 μm one side coating silicon dioxides, described positive pole includes aluminium foil and being just coated on aluminium foil
Pole slurry, anode sizing agent is NCM ternary material and lithium ferric manganese phosphate that mass ratio is 70:30 to be dissolved in solvent NMP；Described
The particle diameter D50=4.5 of lithium ferric manganese phosphate～6.0 μm, D90=10.0～12.0 μm；The particle diameter D50=5.5 of described ternary material
～7.0 μm, D90=4.0～8.0 μm；Possibly together with the CNT of Super-p, 0.5wt% of 1wt% in described anode sizing agent
SK-6 with 0.5wt%；In described anode sizing agent, solid-to-liquid ratio is 1:1；The double spread density of anode sizing agent is 40mg/cm2；Pressure
Real density is 3.0g/cm3.The negative pole of described lithium ion battery includes Copper Foil and the cathode size being coated on Copper Foil, described negative
Containing Delanium carbon in the slurry of pole, the D50 of described Delanium carbon be 10 μm, D90 be 160 μm；In described cathode size also
The CNT of Super-p, 0.5wt% containing 1wt% and the SK-6 of 0.5wt%；The double spread density of cathode size is
17mg/cm2, compacted density is 1.55g/cm3.Described electrolyte is added with LiPF6 and vinylene carbonate.
Embodiment 5
(1) anode sizing agent is prepared: under stirring, by molten for NCM ternary material and the lithium ferric manganese phosphate that mass ratio is 60:40
Solution, in solvent NMP, adds the Graphene of Super-p and 0.5wt% of 1wt%, uniform through high speed dispersion, is prepared as positive pole slurry
Material, solid-to-liquid ratio is 1:1.The particle diameter D50=5.5 μm of described lithium ferric manganese phosphate, D90=12.5 μm；The particle diameter of described ternary material
D50=5.5 μm, D90=4.0 μm.
(2) preparing positive pole and negative pole: be coated on aluminium foil by anode sizing agent, double spread density is 35mg/cm2；Compacting
Density is 2.7g/cm3, it is prepared as positive pole；Will containing Delanium class material with carbon element and conductive agent (Super-p of 1wt%,
The CNT of 0.5wt% and the SK-6 of 0.5wt%) cathode size be coated on Copper Foil, double spread density is 16.5mg/
cm2, compacted density is 1.6g/cm3, it is prepared as negative pole.The D50 of described material with carbon element be 10 μm, D90 be 125 μm.
(3) battery is prepared: after the roll-in respectively of positive pole, negative pole, introduce single or double coating alumina or titanium dioxide
The high-strength barrier film of silicon, described high-strength membrane thicknesses is 10 μm, is prepared as battery by the way of winding or lamination.
(4) battery assembling: battery is welded on positive and negative electrode welding pin and is positioned on the battery cover board of both sides, and load
In battery case, inject electrolyte, described electrolyte is added with LiPF6 and vinylene carbonate, be then passed through chemical conversion, sealing of hole,
Partial volume step is prepared as lithium ion battery.
The lithium ion battery of the present invention has that safety is good, energy density is high, has extended cycle life, high/low temperature strong adaptability,
The feature of big multiplying power discharging can be carried out.As shown in Figure 1, NCM and nickel-cobalt lithium manganate material are uniformly dispersed, and are conducive to coordinating instability
Spinel structure ternary material, thus strengthen the overall security of battery.Fig. 2 is the chemical conversion charging and discharging curve of battery, it is known that
Battery charging and discharging platform is high, is suitable for exploitation high specific energy batteries.From the figure 3, it may be seen that the high and low temperature discharge performance of battery is excellent, 60 degree
High temperature discharge electricity is more than 85% more than 99.9% ,-20 degree discharge electricity amount.As shown in Figure 4, this battery can carry out more than 6C charge and discharge
Electricity, discharging efficiency is higher than 85% (on the basis of 1C discharges).As shown in Figure 5, the cycle performance of battery of the present invention is excellent, uses the longevity
Life is long.
Claims (10)
1. a lithium ion battery based on NCM trielement composite material, it is characterised in that: the positive pole of described lithium ion battery includes
Positive plate and the anode sizing agent being coated on positive plate, containing the NCM that mass ratio is 50～85:50～15 in described anode sizing agent
Ternary material and lithium ferric manganese phosphate；The particle diameter D50=4.5 of described lithium ferric manganese phosphate～10.0 μm, D90=10.0～19.0 μm；
The particle diameter D50=5.0 of described ternary material～10.0 μm, D90=1.0～18.0 μm；In described anode sizing agent possibly together with >=
The conductive agent of 1wt%.
2. lithium ion battery based on NCM trielement composite material as claimed in claim 1, it is characterised in that: described positive pole is starched
Material solvent for use is NMP, and in described anode sizing agent, solid-to-liquid ratio is 0.5～1.25:1.
3. lithium ion battery based on NCM trielement composite material as claimed in claim 1, it is characterised in that: described positive plate
For aluminium foil；The double spread density of the anode sizing agent being coated on positive plate is 30～40mg/cm2；Compacted density be 2.5～
3.0g/cm3。
4. lithium ion battery based on NCM trielement composite material as claimed in claim 1, it is characterised in that: described lithium ion
The negative pole of battery includes negative plate and the cathode size being coated on negative plate, containing material with carbon element in described cathode size, described
D50≤10 μm of material with carbon element, D90≤160 μm；In described cathode size possibly together with >=1.5% conductive agent.
5. lithium ion battery based on NCM trielement composite material as claimed in claim 4, it is characterised in that: described negative plate
For Copper Foil；The double spread density of the cathode size being coated on negative plate is 13～17mg/cm2, compacted density be 1.35～
1.75g/cm3。
6. the lithium ion battery based on NCM trielement composite material as described in claim 1 or 4, it is characterised in that: described conduction
Agent is one or more mixture in Graphene, CNT, super-p, KS-6；And the conduction of described anode sizing agent
Agent must contain the consumption >=0.5wt% of CNT or Graphene, described CNT or Graphene.
7. lithium ion battery based on NCM trielement composite material as claimed in claim 1, it is characterised in that: described lithium ion
Battery also includes electrolyte, is added with LiPF6 and vinylene carbonate in described electrolyte.
8. lithium ion battery based on NCM trielement composite material as claimed in claim 1, it is characterised in that: described lithium ion
The both positive and negative polarity of battery is isolated by high-strength barrier film, prevent short circuit, described high-strength barrier film be single or double coating alumina or
The barrier film of silicon dioxide.
9. the preparation method of a lithium ion battery based on NCM trielement composite material, it is characterised in that comprise the following steps:
(1) anode sizing agent is prepared: under stirring, by NCM ternary material that mass ratio is 50～85:50～15 and phosphoric acid ferrimanganic
Lithium is dissolved in solvent NMP, the conductive agent of addition >=1wt%, uniform through high speed dispersion, is prepared as anode sizing agent, and solid-to-liquid ratio is
0.5～1.25:1；
(2) preparing anode pole piece and cathode pole piece: be coated on aluminium foil by anode sizing agent, double spread density is 30～40mg/
cm2；Compacted density is 2.5～3.0g/cm3, it is prepared as anode pole piece；Cathode size containing material with carbon element and conductive agent is coated with
On Copper Foil, double spread density is 13～17mg/cm2, compacted density is 1.35～1.75g/cm3, it is prepared as cathode pole piece；
(3) prepare battery: after the respectively roll-in of positive pole, negative pole, introduce single or double coating alumina or silicon dioxide
High-strength barrier film, described high-strength membrane thicknesses is 10～25 microns, is prepared as battery by the way of winding or lamination；
(4) battery assembling: battery is welded on positive and negative electrode welding pin and is positioned on the battery cover board of both sides, and load battery
In shell, inject electrolyte, described electrolyte is added with LiPF6 and vinylene carbonate, is then passed through chemical conversion, sealing of hole, partial volume
Step is prepared as lithium ion battery.
10. the preparation method of lithium ion battery based on NCM trielement composite material as claimed in claim 9, it is characterised in that:
Described conductive agent is two or more mixture in Graphene, CNT, super-p, KS-6, and described positive pole slurry
The conductive agent of material must contain the consumption >=0.5wt% of CNT or Graphene, described CNT or Graphene.
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