CN107611356A - A kind of silicon-carbon cathode lithium ion battery - Google Patents
A kind of silicon-carbon cathode lithium ion battery Download PDFInfo
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- CN107611356A CN107611356A CN201710585001.0A CN201710585001A CN107611356A CN 107611356 A CN107611356 A CN 107611356A CN 201710585001 A CN201710585001 A CN 201710585001A CN 107611356 A CN107611356 A CN 107611356A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of silicon-carbon cathode lithium ion battery, including positive plate, negative plate, barrier film and electrolyte, positive plate includes plus plate current-collecting body and the anode sizing agent coated on plus plate current-collecting body surface, negative plate includes negative current collector and the cathode size coated on negative current collector surface, and anode sizing agent includes nickle cobalt lithium manganate tertiary cathode material, conductive agent and positive electrode binder；Cathode size includes silicon-carbon cathode material, conductive agent and negative electrode binder；Electrolyte includes organic solvent, lithium salts, cathode film formation agent and functional additive, and functional additive includes poly(silicon aether) and LiPC4O4F2, the weight/mass percentage composition of poly(silicon aether) in the electrolytic solution is 2 10%, LiPC4O4F2Weight/mass percentage composition in the electrolytic solution is 0.1 2%.
Description
【Technical field】
The invention belongs to cell art, more particularly to a kind of silicon-carbon cathode lithium ion battery.
【Background technology】
At present, in order to improve the energy density of lithium ion battery, mainly by selecting high power capacity, high voltage and high-pressure solid
Both positive and negative polarity active material.Negative active core-shell material of the prior art is more based on graphite, but its gram volume is relatively low, is to restrict lithium
One key factor of ion battery energy density.Silicon materials have the specific capacity of superelevation and discharge platform is worked as with graphite-phase, because
This is considered as the first choice of lithium ion battery anode active material of future generation.But huge body occurs in charge and discharge process for pure silicon
Product change, can cause irreversible capacity loss, cause first discharging efficiency it is low, while can also make to be formed for the first time SE I films (Gu
Body electrolyte interface film) constantly destroyed, formation SE I again can be reacted with electrolyte again by exposing the silicium cathode surface come
Film, so moving in circles so that the capacity of lithium ion battery constantly reduces, and loop attenuation is serious, service life reduction even efflorescence, because
This silicon-carbon cathode material arises at the historic moment.
It is most possible skill industrialized first by silicon materials nanosizing and with carbon material laminating production silicon-carbon cathode material
Art route, nanosizing has some improvement to the electrical property tool of silicium cathode, but the battery performance after improving is still undesirable, especially
It is that long-life cycle performance is poor, battery easy aerogenesis under high-temperature storage conditions, because without matching electricity
Solve liquid and binding agent.In consideration of it, real be necessary to provide a silicon-carbon cathode lithium ion battery to overcome drawbacks described above.
【The content of the invention】
The present invention proposes that a kind of good cycle, high-temperature storage performance are improved and can suppress the silicon-carbon cathode of aerogenesis
Lithium ion battery.
The present invention provides a kind of silicon-carbon cathode lithium ion battery, including positive plate, negative plate, barrier film and electrolyte, described
Positive plate includes plus plate current-collecting body and the anode sizing agent coated on the plus plate current-collecting body surface, and the negative plate includes negative pole collection
Fluid and the cathode size coated on the negative current collector surface, it is characterised in that：The anode sizing agent includes nickel cobalt mangaic acid
Lithium tertiary cathode material, conductive agent and positive electrode binder；The cathode size glues including silicon-carbon cathode material, conductive agent and negative pole
Tie agent；The electrolyte includes organic solvent, lithium salts, cathode film formation agent and functional additive, and the functional additive includes poly-
Silicon ether and LiPC4O4F2, weight/mass percentage composition of the poly(silicon aether) in the electrolyte is 2-10%, LiPC4O4F2In the electrolysis
Weight/mass percentage composition in liquid is 0.1-2%.
In a preferred embodiment, the negative electrode binder is aqueous polyolefin resin glue.
In a preferred embodiment, nickel, cobalt, the molar ratio of manganese are in the nickle cobalt lithium manganate tertiary cathode material
1:1:1、5:2:3 or 8:1:1；The D50 of the nickel manganese cobalt acid lithium tertiary cathode material is preferably 1.5-16 μm.
In a preferred embodiment, the silicon-carbon cathode material is by nanosizing and by graphene or coated modified carbon
Crystalline silicon or the sub- silicon of oxidation be combined with graphite, wherein crystalline silicon or to aoxidize the mass fraction of sub- silicon be 1-30%.
In a preferred embodiment, the conductive agent include Super-p, Ks-6, ECP-300J, ECP-600J,
One or more of mixing in VGCF, CNT and graphene.
In a preferred embodiment, the positive electrode binder includes Kynoar, Kynoar-hexafluoropropene
One or more of mixing in copolymer, polymethyl methacrylate, polyacrylonitrile and polyimides.
In a preferred embodiment, the barrier film be PE monofilms, PP monofilms, PP/PE/PP sandwich diaphragms,
Polypropylene fibre, polyacrylonitrile fibre, vinylon, poly- (glycol terephthalate), poly- terephthaldehyde
One kind in sour glycol ester, Fypro, PPTA and plant cellulose；The hole of the barrier film
Rate is 40-60%, aperture 30-300nm, 7-20 μm of thickness.
In a preferred embodiment, the organic solvent is cyclic carbonate or linear carbonate, preferably carbonic acid
Vinyl acetate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, diethyl carbonate, ethyl acetate, propyl acetate, methyl propionate
And one or more of mixing in ethyl propionate.
In a preferred embodiment, the lithium salts is LiPF6、LiBF4、LiBOB、LiDFOB、LiCF3SO3、LiC
(CF3SO2)3、LiN(CF3SO2)2And LiN (FSO2)2In one or more of mixing, and the concentration of the lithium salts is 0.3-
1.2mol/L。
In a preferred embodiment, cathode film formation agent includes vinylene carbonate, vinylethylene carbonate, 1,3- third
One or more of mixing in sultones and fluorinated ethylene carbonate.
Silicon-carbon cathode lithium ion battery provided by the invention is by nanosizing and with graphene or the crystalline silicon of coated modified carbon
Or the sub- silicon of oxidation is compounded to form silicon-carbon cathode material with graphite；By using the electrolyte and negative pole to match with silicon-carbon cathode
Binding agent, suppress battery and larger volumetric expansion and internal resistance change occur in charge and discharge process, increase the energy density of battery
Add, cycle performance improves.
【Brief description of the drawings】
Fig. 1 is the cycle performance of silicon-carbon cathode lithium ion battery provided by the invention in different embodiments.
Fig. 2 is the impedance test results of silicon-carbon cathode lithium ion battery provided by the invention in different embodiments.
【Embodiment】
The present invention provides a kind of silicon-carbon cathode lithium ion battery, including positive plate, negative plate, barrier film and electrolyte.It is described
Positive plate includes plus plate current-collecting body and the anode sizing agent coated on the plus plate current-collecting body surface, and the negative plate includes negative pole collection
Fluid and the cathode size coated on the negative current collector surface.The anode sizing agent includes nickle cobalt lithium manganate tertiary cathode material
Material, conductive agent and positive electrode binder；The cathode size includes silicon-carbon cathode material, conductive agent and negative electrode binder.The electricity
Solution liquid includes organic solvent, lithium salts, cathode film formation agent and functional additive.
Specifically, nickel, cobalt, the molar ratio of manganese are 1 in the nickle cobalt lithium manganate tertiary cathode material:1:1、5:2:3 or
Person 8:1:1, and the D50 of the nickel manganese cobalt acid lithium tertiary cathode material is preferably 1.5-16 μm.The silicon-carbon cathode material be by
Nanosizing is simultaneously combined by the crystalline silicon or the sub- silicon of oxidation of graphene or coated modified carbon with graphite, wherein crystalline silicon or
The mass fraction for aoxidizing sub- silicon is 1-30%.
The conductive agent includes one kind in Super-p, Ks-6, ECP-300J, ECP-600J, VGCF, CNT and graphene
Or several mixing.The positive electrode binder includes Kynoar, Kynoar-hexafluoropropylene copolymer, polymethyl
One or more of mixing in sour methyl esters and polyacrylonitrile and polyimides.The negative electrode binder is aqueous polyolefin resin
Glue, by being even modified to polyolefin, superior tack, Film making properties, electrolyte resistance are made it have after introducing hydrophilic group
And the features such as durability.The molecular structural formula of aqueous polyolefin resin glue is as follows：
Wherein, n=1000000-1500000, R1, R2, R3 and R4 be hydrophilic radical H, In any one.
The barrier film is PE (polyethylene) monofilm, PP (polypropylene) monofilm, PP/PE/PP sandwich diaphragms, polypropylene
Fiber, polyacrylonitrile fibre, vinylon, poly- (glycol terephthalate), poly terephthalic acid second two
One kind in alcohol ester, Fypro, PPTA and plant cellulose.The porosity of the barrier film is
40-60%, aperture 30-300nm, 7-20 μm of thickness.
The organic solvent is cyclic carbonate or linear carbonate, preferably ethylene carbonate, propene carbonate, carbonic acid
One kind or several in methyl ethyl ester, dimethyl carbonate, diethyl carbonate, ethyl acetate, propyl acetate, methyl propionate and ethyl propionate
Kind mixing.The lithium salts is LiPF6、LiBF4、LiBOB、LiDFOB、LiCF3SO3、LiC(CF3SO2)3、LiN(CF3SO2)2And
LiN(FSO2)2In one or more of mixing, and the concentration of the lithium salts is 0.3-1.2mol/L.The cathode film formation agent includes
One or more of mixing in vinylene carbonate, vinylethylene carbonate, 1,3- propane sultones and fluorinated ethylene carbonate.
The functional additive includes poly(silicon aether) and LiPC4O4F2, weight/mass percentage composition of the poly(silicon aether) in the electrolyte is 2-
10%, LiPC4O4F2Weight/mass percentage composition in the electrolyte is 0.1-2%.
Comparative example
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6It is that cathode film formation agent prepares electrolyte A0 for lithium salts, fluorinated ethylene carbonate.Specifically, first will
Ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate are according to 2:1:2 mass ratio is mixed, and then adds quality thereto
Percentage composition is 1% LiDFOB and 10% fluorinated ethylene carbonate, adds LiPF6It is 1.0mol/L to be dissolved to concentration,
Electrolyte A0 can be obtained.
Embodiment 1
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6Be cathode film formation agent for lithium salts, fluorinated ethylene carbonate, poly(silicon aether) be functional additive prepare electricity
Solve liquid A1.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 mass ratio is mixed
Close, then add LiDFOB, 10% fluorinated ethylene carbonate and 2% poly(silicon aether) that weight/mass percentage composition is 1% thereto,
Add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte A1.
Embodiment 2
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6Be cathode film formation agent for lithium salts, fluorinated ethylene carbonate, poly(silicon aether) be functional additive prepare electricity
Solve liquid A2.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 mass ratio is mixed
Close, then add LiDFOB, 10% fluorinated ethylene carbonate and 4% poly(silicon aether) that weight/mass percentage composition is 1% thereto,
Add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte A2.
Embodiment 3
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6Be cathode film formation agent for lithium salts, fluorinated ethylene carbonate, poly(silicon aether) be functional additive prepare electricity
Solve liquid A3.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 mass ratio is mixed
Close, then add LiDFOB, 10% fluorinated ethylene carbonate and 6% poly(silicon aether) that weight/mass percentage composition is 1% thereto,
Add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte A3.
Embodiment 4
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6Be cathode film formation agent for lithium salts, fluorinated ethylene carbonate, poly(silicon aether) be functional additive prepare electricity
Solve liquid A4.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 mass ratio is mixed
Close, then add LiDFOB, 10% fluorinated ethylene carbonate and 8% poly(silicon aether) that weight/mass percentage composition is 1% thereto,
Add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte A4.
Embodiment 5
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6Be cathode film formation agent for lithium salts, fluorinated ethylene carbonate, poly(silicon aether) be functional additive prepare electricity
Solve liquid A5.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 mass ratio is mixed
Close, then add LiDFOB, 10% fluorinated ethylene carbonate and the 10% poly- silicon that weight/mass percentage composition is 1% thereto
Ether, add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte A5.
Embodiment 6
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6It is cathode film formation agent, poly(silicon aether) and LiPC for lithium salts, fluorinated ethylene carbonate4O4F2Add for function
Agent is added to prepare electrolyte B1.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 matter
Amount ratio is mixed, and then adds LiDFOB, 10% fluorinated ethylene carbonate, 6% that weight/mass percentage composition is 1% thereto
Poly(silicon aether) and 0.5% LiPC4O4F2, add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte B1.
Embodiment 7
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6It is cathode film formation agent, poly(silicon aether) and LiPC for lithium salts, fluorinated ethylene carbonate4O4F2Add for function
Agent is added to prepare electrolyte B2.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 matter
Amount ratio is mixed, and then adds LiDFOB, 10% fluorinated ethylene carbonate, 6% that weight/mass percentage composition is 1% thereto
Poly(silicon aether) and 1.0% LiPC4O4F2, add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte B2.
Embodiment 8
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6It is cathode film formation agent, poly(silicon aether) and LiPC for lithium salts, fluorinated ethylene carbonate4O4F2Add for function
Agent is added to prepare electrolyte B3.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 matter
Amount ratio is mixed, and then adds LiDFOB, 10% fluorinated ethylene carbonate, 6% that weight/mass percentage composition is 1% thereto
Poly(silicon aether) and 1.5% LiPC4O4F2, add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte B3.
Embodiment 9
At room temperature, in the glove box full of argon gas, using ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate to be organic
Solvent, LiDFOB and LiPF6It is cathode film formation agent, poly(silicon aether) and LiPC for lithium salts, fluorinated ethylene carbonate4O4F2Add for function
Agent is added to prepare electrolyte B4.Specifically, first by ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate according to 2:1:2 matter
Amount ratio is mixed, and then adds LiDFOB, 10% fluorinated ethylene carbonate, 6% that weight/mass percentage composition is 1% thereto
Poly(silicon aether) and 2.0% LiPC4O4F2, add LiPF6It is 1.0mol/L to be dissolved to concentration, you can obtains electrolyte B4.
Further, by nickle cobalt lithium manganate tertiary cathode material, conductive carbon black and Kynoar according to 94:3.5:2.5
Mass ratio be dispersed in 1-METHYLPYRROLIDONE and obtain anode sizing agent, the anode sizing agent is coated on plus plate current-collecting body aluminium foil
Surface, by drying, rolling, cutting and obtain positive plate.By silicon-carbon cathode material, conductive carbon black, butadiene-styrene rubber and carboxymethyl
Cellulose is according to 94:3:1.5:1.5 mass ratio is scattered to obtain cathode size in deionized water, and the cathode size is coated
In the surface of negative current collector copper foil, by drying, rolling, cutting and obtain negative plate F1.By silicon-carbon cathode material, conductive carbon
Black, aqueous polyolefin resin glue and carboxymethyl cellulose are according to 94:3:1.5:1.5 mass ratio is scattered to be obtained in deionized water
Cathode size, the cathode size is coated on to the surface of negative current collector copper foil, by drying, rolling, cutting and obtain negative pole
Piece F2.
Test 1
By electrolyte A1, electrolyte A2, electrolyte A3, electrolyte A4, electrolyte A5 and electrolyte A0 respectively with it is described just
Pole piece, the negative plate F2 and polyethylene diagrams are assembled into soft-package battery (5.0Ah), carry out 60 DEG C and shelve volumetric expansion after 10 days
Rate is tested, as a result as shown in the table：
| Electrolyte A5 | Electrolyte A4 | Electrolyte A3 | Electrolyte A2 | Electrolyte A1 | Electrolyte A0 | |
| Expansion rate/% | 6.8 | 7.1 | 7.5 | 9.6 | 13.7 | 26.5 |
Understood according to upper table, the expansion rate for not containing the soft-package battery of the electrolyte assembling of poly(silicon aether) has reached 26.5%, adds
The soft-package battery expansion rate for having added the electrolyte of poly(silicon aether) to assemble has declined, and illustrates that poly(silicon aether) can be effectively improved the height of battery
Warm storage characteristics simultaneously suppress aerogenesis, improve the stability of battery.In addition, when the addition of poly(silicon aether) is 6%, effect is more notable,
It is 6% to continue the addition of increase poly(silicon aether), DeGrain, therefore the optimum addition of poly(silicon aether).
Test 2
Electrolyte B1, electrolyte B2, electrolyte B3, electrolyte B4 and electrolyte A3 are carried out to the electricity under 25 DEG C of states respectively
Conductance is tested, as a result as shown in the table：
| Electrolyte B1 | Electrolyte B2 | Electrolyte B3 | Electrolyte B2 | Electrolyte A3 | |
| Electrical conductivity (ms/cm) | 8.3 | 10.2 | 9.7 | 9.3 | 7.8 |
Understood according to upper table, with LiPC4O4F2Addition, the electrical conductivity of electrolyte is presented the trend for first increasing and reducing afterwards, says
Bright LiPC4O4F2It can effectively improve the electrical conductivity of electrolyte, and best results when addition is 1.0%.
Test 3
Electrolyte A0 and the positive plate, the negative plate F1 and polyethylene diagrams are assembled into soft-package battery 1；Will electrolysis
Liquid A0 is assembled into soft-package battery 2 with the positive plate, the negative plate F2 and polyethylene diagrams；By electrolyte B2 and the positive pole
Piece, the negative plate F2 and polyethylene diagrams are assembled into soft-package battery 3.25 DEG C, 3C constant current charge and discharges are carried out to soft-package battery 1-3
Electric loop test, voltage range 4.2-3.0V, and EIS testing impedances are carried out, frequency 0.01-103Hz.
Charge-discharge test curve is as shown in figure 1, explanation aqueous polyolefin resin glue is more suitable as compared to butadiene-styrene rubber
Negative electrode binder, cyclicity that can be to silicon-carbon cathode lithium ion battery in charge and discharge process caused by Volumetric expansion
Bad it can play very big improvement result.In addition, poly(silicon aether) and LiPC4O4F2As functional additive, silicon-carbon can be effectively improved
The aerogenesis problem of negative electrode lithium ion battery, so as to improve the cycle performance of silicon-carbon cathode lithium ion battery.
EIS impedance test results illustrate the battery using aqueous polyolefin resin glue as shown in Fig. 2 and following table, electrolyte-
The diffusion electricity of the interface impedance R2 of electrode, the Charge-transfer resistance R3 and lithium ion at electrolyte-electrode interface in solid dielectric
It is relatively low to hinder W1, illustrates that aqueous polyolefin resin suppresses the bulk effect of silicon-carbon cathode and causes SEI films to break to a certain extent
Split or particle between loose contact caused by high internal resistance phenomenon.In addition, the poly(silicon aether) of addition 6.0% can effectively improve silicon-carbon
Negative pole aerogenesis problem, meanwhile, add 1.0% LiPC4O4F2Impedance can also be reduced.
Silicon-carbon cathode lithium ion battery provided by the invention is by nanosizing and with graphene or the crystalline silicon of coated modified carbon
Or the sub- silicon of oxidation is compounded to form silicon-carbon cathode material with graphite；By using the electrolyte and negative pole to match with silicon-carbon cathode
Binding agent, suppress battery and larger volumetric expansion and internal resistance change occur in charge and discharge process, increase the energy density of battery
Add, cycle performance improves.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is to combine specific preferred embodiment to institute of the present invention
The further description of work, it is impossible to assert that the specific implementation of the present invention is confined to these explanations.It is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of silicon-carbon cathode lithium ion battery, including positive plate, negative plate, barrier film and electrolyte, the positive plate is included just
Pole collector and the anode sizing agent coated on the plus plate current-collecting body surface, the negative plate include negative current collector and are coated on
The cathode size on the negative current collector surface, it is characterised in that：The anode sizing agent includes nickle cobalt lithium manganate tertiary cathode material
Material, conductive agent and positive electrode binder；The cathode size includes silicon-carbon cathode material, conductive agent and negative electrode binder；The electricity
Solution liquid includes organic solvent, lithium salts, cathode film formation agent and functional additive, the functional additive include poly(silicon aether) and
LiPC4O4F2, weight/mass percentage composition of the poly(silicon aether) in the electrolyte is 2-10%, LiPC4O4F2In the electrolyte
Weight/mass percentage composition is 0.1-2%.
2. silicon-carbon cathode lithium ion battery as claimed in claim 1, it is characterised in that：The negative electrode binder is polyolefin tree
Fat water-base cement.
3. the silicon-carbon cathode lithium ion battery as described in claim 1-2 any one, it is characterised in that：The nickle cobalt lithium manganate
Nickel, cobalt, the molar ratio of manganese are 1 in tertiary cathode material:1:1、5:2:3 or 8:1:1；The nickel manganese cobalt acid lithium tertiary cathode
The D50 of material is preferably 1.5-16 μm.
4. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The silicon-carbon cathode material
It is to be combined by nanosizing and by the crystalline silicon or the sub- silicon of oxidation of graphene or coated modified carbon with graphite, wherein crystalline silicon
Or the mass fraction of the sub- silicon of oxidation is 1-30%.
5. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The conductive agent includes
One or more of mixing in Super-p, Ks-6, ECP-300J, ECP-600J, VGCF, CNT and graphene.
6. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The positive electrode binder bag
Containing in Kynoar, Kynoar-hexafluoropropylene copolymer, polymethyl methacrylate, polyacrylonitrile and polyimides
One or more of mixing.
7. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The barrier film is PE individual layers
It is film, PP monofilms, PP/PE/PP sandwich diaphragms, polypropylene fibre, polyacrylonitrile fibre, vinylon, poly-
(glycol terephthalate), polyethylene terephthalate, Fypro, PPTA and plant
One kind in fibres element；The porosity of the barrier film is 40-60%, aperture 30-300nm, 7-20 μm of thickness.
8. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The organic solvent is ring
Shape carbonic ester or linear carbonate, preferably ethylene carbonate, propene carbonate, methyl ethyl carbonate, dimethyl carbonate, carbonic acid two
One or more of mixing in ethyl ester, ethyl acetate, propyl acetate, methyl propionate and ethyl propionate.
9. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：The lithium salts is LiPF6、
LiBF4、LiBOB、LiDFOB、LiCF3SO3、LiC(CF3SO2)3、LiN(CF3SO2)2And LiN (FSO2)2In one or more mix
Close, and the concentration of the lithium salts is 0.3-1.2mol/L.
10. the silicon-carbon cathode lithium ion battery described in claim 1-2 any one, it is characterised in that：Cathode film formation agent includes
One or more of mixing in vinylene carbonate, vinylethylene carbonate, 1,3- propane sultones and fluorinated ethylene carbonate.
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| CN111211351A (en) * | 2018-11-22 | 2020-05-29 | 中航锂电（洛阳）有限公司 | Electrolyte functional additive for lithium ion battery, lithium ion battery electrolyte and lithium ion battery |
| CN112436150A (en) * | 2020-12-09 | 2021-03-02 | 衡阳力赛储能有限公司 | Low-temperature lithium iron phosphate cylindrical battery and manufacturing method thereof |
| WO2022126858A1 (en) * | 2020-12-14 | 2022-06-23 | 鹏盛国能(深圳)新能源集团有限公司 | Silicon-lithium battery and manufacturing method thereof |
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