CN109687028A - A kind of lithium ion battery with high energy density and preparation method thereof - Google Patents
A kind of lithium ion battery with high energy density and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of high energy lithium ion cell and preparation method thereof, and anode improves its thermal stability and cycle life using the nickelic NCM and NCA composite material collocation of ternary；Cathode is matching using the high silicon carbon material of gram volume；Electrolyte is using self-control formula, by adding the film for additive FEC and VEC etc. of different proportion, stablizes positive and negative electrode surface physics and chemical structure, slow down cell thickness expansion, the increased degree of internal resistance, inhibit the further deterioration of battery performance, improves the capacity circulating conservation rate of battery middle and later periods；Positive and negative electrode collector improves energy density, high rate performance and electrical property consistency using reticulated macroporous copper, aluminium foil auxiliary；Diaphragm uses two-sided Al2O3Ceramics or PVDF or PMMA or Al2O3/ PVDF mixing coating diaphragm improves battery and protects liquid measure and security performance；Other function type auxiliary material is cooperated to improve the ratio of positive and negative electrode main material；Production method through the invention produces a kind of high safety, long circulating, lithium ion battery with high energy density.
Description
Technical field
The invention belongs to power lithium-ion battery fields, specifically, be related to a kind of lithium ion battery with high energy density and
Its production method.
Background technique
In the prior art, secondary cell of the lithium ion battery as a kind of environmental protection, in portable device such as mobile phone, take the photograph
The fields such as camera, laptop are widely applied.Right face, with the development of modern society, to lithium ion battery energy
Density requirements are higher and higher.But current material and production technology restricts the further promotion of lithium ion battery energy density.
Have the characteristics that high, at low cost, the long-life the high-nickel material of energy density, be lithium ion most with prospects just
Pole material, has had an apparent advantage in terms of technical maturity, but these positive electrodes to advanced optimize space smaller, need
Nickel content, upper limit blanking voltage, packaging density and water load equality variable are finely adjusted.And nickelic positive electrode is also deposited
In cationic mixing and charge and discharge process the disadvantages of phase transformation.
Presently, there are two kinds of positive electrodes of NCA and NCM, nickel content there is not difference substantially, capacity substantially close to.For common
Ternary material, only needs air atmosphere in production process, and NCA needs pure oxygen atmosphere, the higher cost of pure oxygen, and to manufacture
The requirement of oxygen production supply equipment is high, while NCA is stronger to temperature and humidity sensibility, needs production environment humid control 10%
Hereinafter, increasing the cost of production and management.Thermostabilization under nickelic NCA material state-of-charge is lower, leads to the safety of battery
Property decline.On the other hand, serious production gas in charge and discharge process, leads to battery oxygen blast cyanidation, and recycle and shelf-life decline, gives
Battery brings security risk.NCM is lower with respect to the Co content of NCA, it means that NCM has better cost and energy density excellent
Gesture, but NCM tertiary cathode material the defects of that there is circulation volume conservation rates in actual use is low, poor safety performance.
Application No. is the Chinese patents of CN201510839939.1 to disclose a kind of lithium ion battery blended anode material
And preparation method thereof, which includes NCA positive electrode and LFPO positive electrode.NCA positive electrode and LFPO anode material
The stoichiometric ratio of material is 9:1~7:3.NCA positive electrode is LiNi0.8Co0.15Al0.05O2, crystal grain is spherical shape, average grain diameter
Preferably 14 μm.LFPO positive electrode is LiFePO4, the average grain diameter of particle is preferably 80nm.It is main existing for this scheme
Problem is thermal stability not enough and Capacity fading is fast, and the high-specific-capacity silicon carbon cathode arranged in pairs or groups therewith is due to volume expansion, no
Granule atomization is only easily led to, cycle performance is made to be deteriorated, active material can also be made to contact variation with conductive agent, binder, in increase
Resistance.
Summary of the invention
To solve the above problems, the present invention provides a kind of lithium ion battery with high energy density and preparation method thereof, anode is adopted
Its thermal stability and cycle life are improved with the nickelic NCM and NCA composite material collocation of ternary, the recombination energy of Co, Al promote Ni2+'s
Oxidation reduces by 3a Ni2+Content inhibits irreversible transition of the material crystal structure from H2 to H3, to improve material itself
Cyclical stability, Mn incorporation guidance lithium and nickel layer between mixes, improve the high-temperature behavior of material.Cathode is high using gram volume
Silicon carbon material it is matching；Electrolyte adds the film for additive FEC and VEC etc. of different proportion, stablizes positive and negative electrode interface object
Reason and chemical structure slow down cell thickness expansion, the increased degree of internal resistance, inhibit the further deterioration of battery performance, improve electricity
The capacity circulating conservation rate of pond middle and later periods；Positive and negative electrode collector using reticulated macroporous copper, aluminium foil auxiliary improve energy density, times
Rate performance and electrical property consistency；Diaphragm uses two-sided Al2O3Ceramics or PVDF or PMMA or Al2O3/ PVDF mixing coating diaphragm
It improves battery and protects liquid measure and security performance.
Specific technical solution of the present invention is as follows:
The present invention provides a kind of lithium ion battery with high energy density comprising: anode, cathode, diaphragm and electrolyte, it is special
Sign is that the anode uses NCA nickel cobalt aluminium (LiNi0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) trielement composite material, the cathode uses silicon carbon material, the diaphragm using ceramics, PVDF,
PMMA or ceramics/PVDF mixture coat diaphragm, the electrolyte addition film for additive fluoroethylene carbonate FEC and carbonic acid
Vinylethylene VEC.
It is preferred that NCM and NCA mass ratio is 1-4:6-9.
It is preferred that NCM and NCA mass ratio is 3:7.
It is preferred that cathode silicon carbon material Si content is 5%~20%.
It is preferred that the plus plate current-collecting body uses reticulated macroporous copper foil, with a thickness of 4~20 μm, foil porosity is 10%~
40%, aperture is 0.05mm~0.5mm, and pitch of holes is 0.1mm~1.0mm.
It is preferred that the negative current collector uses reticulated macroporous aluminium foil, with a thickness of 10 μm~20 μm, foil porosity is 10%
~20%, aperture is 0.1mm~0.4mm, and pitch of holes is 0.5mm~1.0mm.
It is preferred that PP or PE basement membrane thickness is at 8 μm~20 μm in the diaphragm, single side coating thickness is at 2 μm~5 μm, coating
Diaphragm overall thickness afterwards is between 12 μm~30 μm.
It is preferred that diaphragm has 5 kinds of forms:
1, double-surface ceramics coat PP or PE diaphragm；2, one side ceramic coated, another side PVDF or PMMA coating PP or PE every
Film；3, single side ceramic coated+two-sided PVDF coats PP or PE diaphragm；4, single side ceramic coated+two-sided PVDF coating PP or PE every
Film；5, two-sided PVDF and ceramics mixing coating PP or PE diaphragm.
It is preferred that the electrolyte prescription is as follows:
Control LiPF in electrolyte6Mass fraction be 10.0%~15.0%, the mass fraction of propene carbonate EC is
The mass fraction of 25.0%~30.0%, methyl ethyl ester EMC are 45.0%~50.0%, the quality of ethylene carbonate PC
Score is 6.0%~10.0%, and the mass fraction that the mass fraction of propylene sulfite PS is 2.0%~5.0%, FEC is
The mass fraction of 5.0%~10.0%, VEC are 1.0%~2.0%.
The present invention further provides a kind of lithium ion battery with high energy density production methods, comprising the following steps:
Step 1, anode preparation: weighing positive electrode, and the positive electrode uses the nickelic NCM and NCA mixing material of ternary
Material, then matched with suitable functional form auxiliary material, it is fabricated to battery core anode；
Cathode preparation: step 2 is matched using silicon carbon material and suitable functional form auxiliary material, is fabricated to battery core
Cathode；
Diaphragm preparation: step 3 coats diaphragm using ceramics, PVDF, PMMA or ceramics/PVDF mixture；
Step 4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC matter
The mass fraction that the mass fraction that amount score is 25.0%~30.0%, EMC is 45.0%~50.0%, PC is 6.0%~
The mass fraction of 10.0%, PS are that the mass fraction of 2.0%~5.0%, FEC is the mass fraction of 5.0%~10.0%, VEC
It is 1.0%~2.0%；
Step 5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte.
It is preferred that the reticulated macroporous aluminium foil coated side density of control battery core anode is 200g/ ㎡~240g/ ㎡.
It is preferred that the reticulated macroporous copper foil coating surface density of control battery core cathode is 80g/ ㎡~120g/ ㎡.
It is preferred that the positive compactness of control battery core anode is 3.4g/cm3~3.6g/cm3。
It is preferred that the cathode compactness of control battery core cathode is 1.4g/cm3~1.6g/cm3。
It is preferred that controlling guarantor's liquid coefficient of electrolyte in 3.1g/Ah~3.3g/Ah.
It is preferred that control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MPa.
Functional form auxiliary material includes SP and PVDF in preferred steps one, further includes one in KS-6 or carbon nanotube CNT
Kind.
Functional form auxiliary material includes sodium carboxymethylcellulose CMC and butadiene-styrene latex SBR in preferred steps two, is in addition added
Or mixtures thereof one of SP or CNT.
By implementing above technical scheme, have following technical effect that
1, anode improves its thermal stability and cycle life, Co, Al using the nickelic NCM and NCA composite material collocation of ternary
Recombination energy promote Ni2+Oxidation, reduce 3a Ni2+Content inhibits irreversible transition of the material crystal structure from H2 to H3,
To improve the cyclical stability of material itself, is mixed between the incorporation guidance lithium and nickel layer of Mn, improve the high temperatures of material
Energy.
2, electrolyte can be stablized using self-control formula by adding the film for additive FEC and VEC etc. of different proportion
Positive and negative electrode surface physics and chemical structure slow down cell thickness expansion, the increased degree of internal resistance, inhibit battery performance into one
Step deteriorates, and improves the capacity circulating conservation rate in battery later period.
3, positive and negative electrode collector improves energy density, high rate performance and electrical property one using reticulated macroporous copper, aluminium foil auxiliary
Cause property.
4, diaphragm uses two-sided Al2O3Ceramics or PVDF or PMMA or Al2O3/ PVDF mixing coating diaphragm improves battery and protects
Liquid measure and security performance.
Production method through the invention, lithium ion battery obtained have excellent electrical property, stable circulation, safety it is good,
The advantages that energy density is high.Compared with prior art, the internal resistance of lithium ion battery becomes smaller, and high rate performance performs better, safety
Higher, energy density is higher, and battery cycle life is longer.
Detailed description of the invention
Fig. 1 is battery structure figure of the present invention.
Fig. 2 is that the positive main material gram volume under finished battery difference discharge-rate plays histogram.
Fig. 3 is finished battery room temperature 1C/1C charge and discharge cycles figure.
Wherein, 5 aluminum plastic film of positive 2 silicon-carbon cathode, 3 gluing ceramic diaphragm, the 4 micropore copper foil of appended drawing reference 1NCA-NCM, 6 micropore
7 negative lug of aluminium foil, 8 positive pole ear
Specific embodiment
It is as shown in Figure 1 battery structure figure of the present invention, battery includes: that anode 1, cathode 2, diaphragm 3 and electrolyte, anode are adopted
With NCA nickel cobalt aluminium (LiNi0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese (LiNi0.8Co0.1Mn0.1O2) tri compound material
Material, cathode 2 use silicon carbon material, and diaphragm 3 coats diaphragm, the electricity using ceramics, PVDF, PMMA or ceramics/PVDF mixture
It solves liquid and adds film for additive FEC and VEC.
LiPF in electrolyte6Mass fraction be 10.0%~15.0%, EC mass fraction be 25.0%~30.0%,
The mass fraction that the mass fraction that the mass fraction of EMC is 45.0%~50.0%, PC is 6.0%~10.0%, PS is 2.0%
The mass fraction that the mass fraction of~5.0%, FEC are 5.0%~10.0%, VEC is 1.0%~2.0%.
Preparation method of the present invention is described further combined with specific embodiments below:
Embodiment 1:
The present invention is a kind of lithium ion battery with high energy density production method, comprising the following steps:
S1, anode preparation: NCA nickel cobalt aluminium (LiNi is weighed0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) ternary material, control nickel cobalt aluminium and nickel-cobalt-manganese ternary material mass ratio be 8:2, then with it is suitable
One of KS-6 or carbon nanotube CNT, SP and PVDF are matched, and battery core anode is fabricated to；
S2, cathode preparation: using silicon-carbon (silicone content 10%) material, then with one of suitable SP or CNT or its
Mixture, CMC and SBR are matched, and battery core cathode is fabricated to；
S3, diaphragm preparation: using the single layer PE with a thickness of 12 μm, thickness is 3 μm of two-sided PVDF/Al2O3Mixing coating
Gluing ceramic diaphragm.
S4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC quality point
The mass fraction that the mass fraction that number is 25.0%~30.0%, EMC is 45.0%~50.0%, PC is 6.0%~10.0%,
The mass fraction that the mass fraction that the mass fraction of PS is 2.0%~5.0%, FEC is 5.0%~10.0%, VEC is 1.0%
~2.0%；
S5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte control the reticulated macroporous of battery core anode
Aluminium foil coated side density is 200g/m2~240g/m2；The reticulated macroporous copper foil coating surface density for controlling battery core cathode is 80g/m2
~120g/m2；The positive compactness for controlling battery core anode is 3.4g/cm3~3.6g/cm3；Control the cathode compacting of battery core cathode
Degree is 1.4g/cm3~1.6g/cm3；Guarantor's liquid coefficient of electrolyte is controlled in 3.1g/Ah~3.3g/Ah；(for gluing ceramics every
Film) control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MP.
S6, test result: the performance of anode main material gram volume shows themselves in that 0.2C, 0.5C and 1C electric discharge are respectively
200.4mAh/g, 196.9mAh/g and 190.7mAh/g, the capacity retention ratio that 1C/1C charge and discharge cycles are 500 times and 1000 times point
It Wei 93.66% and 84.54%；
Embodiment 2:
The present invention is a kind of lithium ion battery with high energy density production method, comprising the following steps:
S1, anode preparation: NCA nickel cobalt aluminium (LiNi is weighed0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) ternary material, control nickel cobalt aluminium and nickel-cobalt-manganese ternary material mass ratio be 7:3, then with it is suitable
One of KS-6 or carbon nanotube CNT, SP and PVDF are matched, and battery core anode is fabricated to；
S2, cathode preparation: using silicon-carbon (silicone content 10%) material, then with one of suitable SP or CNT or its
Mixture, CMC and SBR are fabricated to battery core cathode；
S3, diaphragm preparation: using the single layer PE with a thickness of 12 μm, thickness is 3 μm of two-sided PVDF/Al2O3Mixing coating
Gluing ceramic diaphragm.
S4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC quality point
The mass fraction that the mass fraction that number is 25.0%~30.0%, EMC is 45.0%~50.0%, PC is 6.0%~10.0%,
The mass fraction that the mass fraction that the mass fraction of PS is 2.0%~5.0%, FEC is 5.0%~10.0%, VEC is 1.0%
~2.0%；
S5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte control the reticulated macroporous of battery core anode
Aluminium foil coated side density is 200g/m2~240g/m2；The reticulated macroporous copper foil coating surface density for controlling battery core cathode is 80g/m2
~120g/m2；The positive compactness for controlling battery core anode is 3.4g/cm3~3.6g/cm3；Control the cathode compacting of battery core cathode
Degree is 1.4g/cm3~1.6g/cm3；Guarantor's liquid coefficient of electrolyte is controlled in 3.1g/Ah~3.3g/Ah；(for gluing ceramics every
Film) control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MPa.
S6, test result: the performance of anode main material gram volume shows themselves in that 0.2C, 0.5C and 1C electric discharge are respectively
201.2mAh/g, 197.8mAh/g and 192.3mAh/g, the capacity retention ratio that 1C/1C charge and discharge cycles are 500 times and 1000 times point
It Wei 94.77% and 86.05%；
Embodiment 3:
The present invention is a kind of lithium ion battery with high energy density production method, comprising the following steps:
S1, anode preparation: NCA nickel cobalt aluminium (LiNi is weighed0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) ternary material, control nickel cobalt aluminium and nickel-cobalt-manganese ternary material mass ratio be 6:4, then with it is suitable
One of KS-6 or carbon nanotube CNT, SP and PVDF are matched, and battery core anode is fabricated to；
S2, cathode preparation: using silicon-carbon (silicone content 10%) material, then with one of suitable SP or CNT or its
Mixture, CMC and SBR are matched, and battery core cathode is fabricated to；
S3, diaphragm preparation: using the single layer PE with a thickness of 12 μm, thickness is 3 μm of two-sided PVDF/Al2O3Mixing coating
Gluing ceramic diaphragm.
S4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC quality point
The mass fraction that the mass fraction that number is 25.0%~30.0%, EMC is 45.0%~50.0%, PC is 6.0%~10.0%,
The mass fraction that the mass fraction that the mass fraction of PS is 2.0%~5.0%, FEC is 5.0%~10.0%, VEC is 1.0%
~2.0%；
S5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte control the reticulated macroporous of battery core anode
Aluminium foil coated side density is 200g/m2~240g/m2；The reticulated macroporous copper foil coating surface density for controlling battery core cathode is 80g/m2
~120g/m2；The positive compactness for controlling battery core anode is 3.4g/cm3~3.6g/cm3；Control the cathode compacting of battery core cathode
Degree is 1.4g/cm3~1.6g/cm3；Guarantor's liquid coefficient of electrolyte is controlled in 3.1g/Ah~3.3g/Ah；(for gluing ceramics every
Film) control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MPa.
S6, test result: the performance of anode main material gram volume shows themselves in that 0.2C, 0.5C and 1C electric discharge are respectively
200.1mAh/g, 196.5mAh/g and 189.6mAh/g, the capacity retention ratio that 1C/1C charge and discharge cycles are 500 times and 1000 times point
It Wei 93.68% and 84.13%；
Embodiment 4:
The present invention is a kind of lithium ion battery with high energy density production method, comprising the following steps:
S1, anode preparation: NCA nickel cobalt aluminium (LiNi is weighed0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) ternary material, control nickel cobalt aluminium and nickel-cobalt-manganese ternary material mass ratio be 9:1, then with it is suitable
SP, KS-6 or CNT and PVDF are matched, and battery core anode is fabricated to；
S2, cathode preparation: using silicon-carbon (silicone content 10%) material, then with one of suitable SP or CNT or its
Mixture, CMC and SBR are matched, and battery core cathode is fabricated to；
S3, diaphragm preparation: using the single layer PE with a thickness of 12 μm, thickness is that 3 μm of two-sided PVDF/Al2O3 mixing applies
The gluing ceramic diaphragm covered.
S4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC quality point
The mass fraction that the mass fraction that number is 25.0%~30.0%, EMC is 45.0%~50.0%, PC is 6.0%~10.0%,
The mass fraction that the mass fraction that the mass fraction of PS is 2.0%~5.0%, FEC is 5.0%~10.0%, VEC is 1.0%
~2.0%；
S5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte control the reticulated macroporous of battery core anode
Aluminium foil coated side density is 200g/m2~240g/m2；The reticulated macroporous copper foil coating surface density for controlling battery core cathode is 80g/m2
~120g/m2；The positive compactness for controlling battery core anode is 3.4g/cm3~3.6g/cm3；Control the cathode compacting of battery core cathode
Degree is 1.4g/cm3~1.6g/cm3；Guarantor's liquid coefficient of electrolyte is controlled in 3.1g/Ah~3.3g/Ah；(for gluing ceramics every
Film) control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MPa.
S6, test result: the performance of anode main material gram volume shows themselves in that 0.2C, 0.5C and 1C electric discharge are respectively
199.6mAh/g, 196.1mAh/g and 188.8mAh/g, the capacity retention ratio that 1C/1C charge and discharge cycles are 500 times and 1000 times point
It Wei 91.86% and 82.11%；
Comparative example 1:
The present invention is a kind of lithium ion battery with high energy density production method, comprising the following steps:
S1, anode preparation: NCA nickel cobalt aluminium (LiNi is weighed0.8Co0.2-xAlxO2,0 < x < 0.2) ternary material, then with it is suitable
One of KS-6 or CNT, SP and PVDF are matched, and battery core anode is fabricated to；
S2, cathode preparation: using silicon-carbon (silicone content 10%) material, then with one of suitable SP or CNT or its
Mixture, CMC and SBR are matched, and battery core cathode is fabricated to；
S3, diaphragm preparation: using the single layer PE with a thickness of 12 μm, thickness is that 3 μm of two-sided PVDF/Al2O3 mixing applies
The gluing ceramic diaphragm covered.
S4, electrolyte preparation: LiPF in control electrolyte6Mass fraction be 10.0%~15.0%, EC quality point
The mass fraction that the mass fraction that number is 25.0%~30.0%, EMC is 45.0~50.0%, PC is 8.0%~10.0%, PS
Mass fraction be 2.0%~4.0%, FEC mass fraction be 1.0%~3.0%, VEC mass fraction be 0.2%~
0.8%；
S5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte control the reticulated macroporous of battery core anode
Aluminium foil coated side density is 200g/m2~240g/m2；The reticulated macroporous copper foil coating surface density for controlling battery core cathode is 80g/m2
~120g/m2；The positive compactness for controlling battery core anode is 3.4g/cm3~3.6g/cm3；Control the cathode compacting of battery core cathode
Degree is 1.4g/cm3~1.6g/cm3；Guarantor's liquid coefficient of electrolyte is controlled in 3.1g/Ah~3.3g/Ah；(for gluing ceramics every
Film) control battery core chemical synthesis technology condition are as follows: temperature 70 C~85 DEG C, pressure 0.5MPa~1.5MPa.
S6, test result: the performance of anode main material gram volume shows themselves in that 0.2C, 0.5C and 1C electric discharge are respectively
198.7mAh/g, 195.6mAh/g and 187.4mAh/g, the capacity retention ratio that 1C/1C charge and discharge cycles are 500 times and 1000 times point
It Wei 90.47% and 75.77%；
As Figure 2-3, when only using NCA ternary material that lithium ion battery is made, the capacity of battery under the same conditions
The opposite embodiment 1-4 of performance performance is lower, and the conservation rate of capacity under the same conditions is also low, this is because with the increasing of temperature
Add, the thermal stability of battery is not enough and Capacity fading is fast, the high-specific-capacity silicon carbon cathode arranged in pairs or groups therewith due to volume expansion,
Internal resistance is caused to increase, and the present invention is by using NCA nickel cobalt aluminium (LiNi0.8Co0.2-xAlxO2, 0 < x < 0.2) and NCM nickel cobalt manganese
(LiNi0.8Co0.1Mn0.1O2) trielement composite material, the compound promotion Ni of Co, Al2+Oxidation, reduce 3a Ni2+Content inhibits
Irreversible transition of the material crystal structure from H2 to H3, so that the cyclical stability of material itself is improved, the incorporation guidance of Mn
It is mixed between lithium and nickel layer, improves the high-temperature behavior of material.Compared with prior art, the production method institute provided through the invention
The internal resistance of lithium ion battery lithium ion battery obtained becomes smaller, and high rate performance performs better, and has excellent electrical property, circulation steady
Calmly, the advantages that safety is good, energy density is high, battery cycle life is longer.
The preferred embodiment of the patent is described in detail above, but this patent is not limited to above-mentioned embodiment party
Formula within the knowledge of one of ordinary skill in the art can also be under the premise of not departing from this patent objective
It makes a variety of changes.
Claims (12)
1. a kind of lithium ion battery with high energy density comprising: anode, cathode, diaphragm and electrolyte, which is characterized in that described
Anode is LiNi using NCA nickel cobalt aluminium and NCM nickel-cobalt-manganese ternary composite material, the chemical formula of NCA nickel cobalt aluminium0.8Co0.2-xAlxO2,
The chemical formula of wherein 0 < x < 0.2, NCM nickel cobalt manganese is LiNi0.8Co0.1Mn0.1O2, the cathode is using silicon carbon material, the diaphragm
Diaphragm is coated using ceramics, PVDF, PMMA or ceramics/PVDF mixture, the electrolyte adds film for additive FEC and VEC.
2. lithium ion battery with high energy density according to claim 1, which is characterized in that NCM and NCA mass ratio is 1-4:
6-9。
3. lithium ion battery with high energy density according to claim 2, which is characterized in that NCM and NCA mass ratio is 3:7.
4. lithium ion battery with high energy density according to claim 1, which is characterized in that PP or PE basement membrane in the diaphragm
Thickness is at 8 μm~20 μm.
5. lithium ion battery with high energy density according to claim 1, which is characterized in that the diaphragm single side coating thickness
At 2 μm~5 μm, the diaphragm overall thickness after coating is between 12 μm~30 μm.
6. lithium ion battery with high energy density according to claim 1, which is characterized in that the diaphragm be it is following it is several in
One kind: a, double-surface ceramics coat PP or PE diaphragm；B, one side ceramic coated, another side PVDF or PMMA coating PP or PE every
Film；C, single side ceramic coated+two-sided PVDF coats PP or PE diaphragm；D, single side ceramic coated+two-sided PVDF coating PP or PE every
Film；E, in two-sided PVDF and ceramics mixing coating PP or PE diaphragm.
7. lithium ion battery with high energy density according to claim 1, which is characterized in that the electrolyte prescription is as follows:
LiPF6Mass fraction be the mass fraction of 10.0%~15.0%, EC be the mass fraction of 25.0%~30.0%, EMC
The mass fraction that mass fraction for 45.0%~50.0%, PC is 6.0%~10.0%, PS is 2.0%~5.0%, FEC's
The mass fraction that mass fraction is 5.0%~10.0%, VEC is 1.0%~2.0%.
8. lithium ion battery with high energy density according to claim 1, which is characterized in that the negative electrode material is silicon substrate carbon
Negative electrode material, wherein Si content is 5%~20%.
9. lithium ion battery with high energy density according to claim 1, which is characterized in that plus plate current-collecting body is using netted micro-
Hole copper foil, with a thickness of 4~20 μm, foil porosity is 10%~40%, and aperture is 0.05mm~0.5mm, pitch of holes 0.1mm
~1.0mm.
10. lithium ion battery with high energy density according to claim 1, which is characterized in that negative current collector is using netted
Micropore aluminium foil, with a thickness of 10 μm~20 μm, foil porosity is 10%~20%, and aperture is 0.1mm~0.4mm, and pitch of holes is
0.5mm~1.0mm.
11. a kind of lithium ion battery with high energy density production method, which comprises the following steps:
Step 1, anode preparation: weighing positive electrode, and the positive electrode uses the nickelic NCM and NCA mixing material of ternary, then
It is matched with suitable functional form auxiliary material, is fabricated to battery core anode；
Cathode preparation: step 2 uses negative electrode material, then is matched with suitable functional form auxiliary material, be fabricated to battery core
Cathode；
Diaphragm preparation: step 3 coats diaphragm using ceramics, PVDF, PMMA or ceramics/PVDF mixture；
Step 4, preparation are added with the electrolyte of film for additive FEC and VEC；
Step 5, battery core preparation: assembly battery core anode, battery core cathode, diaphragm and electrolyte.
12. lithium ion battery with high energy density production method according to claim 9, which is characterized in that function in step 1
Energy type auxiliary material includes SP and PVDF, further includes one of KS-6 or carbon nanotube CNT, functional form assists material in step 2
Material includes sodium carboxymethylcellulose CMC and butadiene-styrene latex SBR, in addition adds or mixtures thereof one of SP or CNT.
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| CN110137467A (en) * | 2019-05-14 | 2019-08-16 | 珠海冠宇电池有限公司 | A kind of lithium ion battery of high-energy density |
| CN110661036A (en) * | 2019-09-03 | 2020-01-07 | 河南豫清新能源产业有限公司 | Manufacturing method of high-specific energy power lithium ion battery |
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