CN105140565A - Nonaqueous electrolyte for high-voltage lithium-ion battery and lithium-ion battery - Google Patents

Nonaqueous electrolyte for high-voltage lithium-ion battery and lithium-ion battery Download PDF

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Publication number
CN105140565A
CN105140565A CN201510481545.3A CN201510481545A CN105140565A CN 105140565 A CN105140565 A CN 105140565A CN 201510481545 A CN201510481545 A CN 201510481545A CN 105140565 A CN105140565 A CN 105140565A
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carbonate
lithium ion
electrolyte
oxide
ion battery
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石桥
胡时光
周雪
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Shenzhen Capchem Technology Co Ltd
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Shenzhen Capchem Technology Co Ltd
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Priority to CN201510481545.3A priority Critical patent/CN105140565A/en
Priority to PCT/CN2015/091505 priority patent/WO2017020429A1/en
Publication of CN105140565A publication Critical patent/CN105140565A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D497/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having oxygen and sulfur atoms as the only ring hetero atoms
    • C07D497/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having oxygen and sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D497/10—Spiro-condensed systems
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • 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

Abstract

The invention discloses nonaqueous electrolyte for a high-voltage lithium-ion battery and the lithium-ion battery. The electrolyte comprises a nonaqueous organic solvent, a lithium salt and a double-nitrite compound, wherein the double-nitrite compound is selected from the structural formula 1; the structural formula 1 is as shown in the specification; and n is a natural number from 1 to 4. The nonaqueous electrolyte for the lithium-ion battery disclosed by the invention contains the double-nitrite compound as shown in the structural formula 1, and can form a complex together cathode metal ions on the cathode material surface; catalytic oxidation decomposition reaction on the electrolyte caused by the metal ions is suppressed; and the interfacial properties of the cathode material and the electrolyte are improved, so that the high-temperature storage and cycle performance of the battery is improved.

Description

A kind of high-voltage lithium ion batteries nonaqueous electrolytic solution and lithium ion battery
Technical field
The present invention relates to the battery of battery electrolytic solution and this electrolyte of use, particularly relate to a kind of high-voltage lithium ion batteries nonaqueous electrolytic solution and lithium ion battery.
Background technology
Lithium rechargeable battery has that operating voltage is high, specific energy density is large, have extended cycle life, self-discharge rate is low, memory-less effect and the advantage such as environmental pollution is little, being widely used in all kinds of consumer electronics market, is also the ideal power source of following motor vehicle and various electric tool.In technical field, the operating voltage of lifting lithium rechargeable battery or platform voltage effectively can improve the energy density of lithium ion battery.
The charging of cobalt acid lithium battery is brought up to 4.35V by voltage from 4.2V, and its battery capacity improves about 15%.But meanwhile, the performance of battery obviously reduces, the especially high temperature circulation of battery and high-temperature storage performance.The reason of these problems is caused to mainly contain: (1) electrolyte is in the positive electrode oxidized decomposition in surface.Under high voltages, the oxidation activity of positive electrode active materials is higher, reactivity between itself and electrolyte is increased, add at high temperature, reaction between high-voltage anode and electrolyte aggravates further, cause the oxidative degradation products of electrolyte constantly in positive electrode surface deposition, deteriorate positive electrode surface characteristic, cause the internal resistance of battery and thickness constantly to increase.(2) digestion of metallic ion in positive electrode lattice and reduction.On the one hand, at high temperature, the LiPF in electrolyte 6as easy as rolling off a log decomposition, produces HF and PF 5.Wherein HF can corrode positive pole, causes the stripping of metal ion, thus destroys cathode material structure, causes capacity to run off; On the other hand, under high voltages, electrolyte is easily oxidized at positive pole, cause the metal ion of positive active material to be easily reduced and stripping in electrolyte, thus destroy cathode material structure, cause capacitance loss.Meanwhile, stripping is to the metal ion of electrolyte, and be easily reduced into metal simple-substance through SEI film arrives negative pole acquisition electronics, thus destroy the structure of SEI film, cause cathode impedance constantly to increase, self-discharge of battery aggravates, and irreversible capacity increases, penalty.
Summary of the invention
The invention provides and a kind ofly improve the high-temperature storage of high-voltage lithium ion batteries and the nonaqueous electrolytic solution of cycle performance, the high-voltage lithium ion batteries using this electrolyte is also provided simultaneously.
According to a first aspect of the invention, the invention provides a kind of high-voltage lithium ion batteries nonaqueous electrolytic solution, comprise non-aqueous organic solvent, lithium salts and be selected from the two nitrile compounds shown in structural formula 1,
Wherein, n is the natural number of 1-4.
Scheme as a further improvement on the present invention, the two nitrile compounds shown in structure above 1 account for 0.1% ~ 5% of above-mentioned electrolyte total weight.
Two nitrile compounds shown in structure above 1 can be specifically following compound 1, compound 2, compound 3 or compound 4,
As further improved plan of the present invention, the two nitrile compounds shown in structure above 1 are selected from compound 2.
Scheme as a further improvement on the present invention, above-mentioned non-aqueous organic solvent is the mixture of cyclic carbonate and linear carbonate, above-mentioned cyclic carbonate be selected from ethylene carbonate, propene carbonate and butylene one or more, above-mentioned linear carbonate be selected from dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate one or more.
Scheme as a further improvement on the present invention, above-mentioned lithium salts is selected from LiPF 6, LiBF 4, LiSbF 6, LiAsF 6, LiN (SO 2cF 3) 2, LiN (SO 2c 2f 5) 2, LiC (SO 2cF 3) 3with LiN (SO 2f) 2in one or more.
Scheme as a further improvement on the present invention, above-mentioned electrolyte also comprises additive, this additive be selected from vinylene carbonate, PS, fluorinated ethylene carbonate and vinyl ethylene carbonate one or more.
According to a second aspect of the invention, the invention provides a kind of lithium ion battery, the barrier film comprising positive pole, negative pole and be placed between positive pole and negative pole, also comprise the non-aqueous electrolyte for lithium ion cell of first aspect.
Scheme as a further improvement on the present invention, above-mentioned positive pole is selected from LiCoO 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, wherein, M be selected from Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti one or more, and 0≤y≤1,0≤x≤1,0≤z≤1, x+y+z≤1.
Scheme as a further improvement on the present invention, above-mentioned positive pole is selected from the coated LiCoO of metal oxide 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, above-mentioned metal oxide be selected from aluminium oxide, titanium oxide, zirconia, magnesium oxide, calcium oxide, antimony oxide, bismuth oxide, zinc oxide, nickel oxide, iron oxide one or more.
Scheme as a further improvement on the present invention, the charge cutoff voltage of above-mentioned lithium ion battery is more than or equal to 4.35V.
In non-aqueous electrolyte for lithium ion cell of the present invention, containing the two nitrile compounds shown in structural formula 1, can at positive electrode surface and cathode metal ion forming complex, inhibit metal ion to the catalytic oxidation decomposition reaction of electrolyte, improve the interface performance of positive electrode and electrolyte, thus improve high-temperature storage and the cycle performance of battery.
Embodiment
Below by embodiment, the present invention is described in further detail.
One embodiment of the invention provide a kind of high-voltage lithium ion batteries nonaqueous electrolytic solution, comprise non-aqueous organic solvent, lithium salts and are selected from the two nitrile compounds shown in structural formula 1,
Wherein, n is the natural number of 1-4.
In a preferred embodiment of the invention, the two nitrile compounds shown in structure above 1 account for 0.1% ~ 5% of above-mentioned electrolyte total weight.When two nitrile compounds content in the electrolytic solution lower than 0.1% time, can not complexing cathode metal ion effectively, thus effectively can not suppress the oxidative decomposition of metal ion catalysis electrolyte; When two nitrile compounds content is in the electrolytic solution higher than 5%, the complex compound formed at positive electrode surface is blocked up, improves positive pole impedance, thus reduces the performance of battery.
In a preferred embodiment of the invention, the two nitrile compounds shown in structure above 1 are selected from least one in following compound 1, compound 2, compound 3 and compound 4,
Preferably, the two nitrile compounds shown in structure above 1 are selected from compound 2, and the chemical name of the compound shown in compound 2 is 3,9-two (3-cyanoethyl)-2,4,8,10-tetra-oxaspiro [5.5] hendecane.
In a preferred embodiment of the invention, above-mentioned non-aqueous organic solvent is the mixture of cyclic carbonate and linear carbonate, above-mentioned cyclic carbonate be selected from ethylene carbonate, propene carbonate and butylene one or more, above-mentioned linear carbonate be selected from dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate one or more.
Adopt the cyclic carbonate organic solvent of high-k and the mixed liquor of low viscous linear carbonate organic solvent as the solvent of lithium-ion battery electrolytes, make the mixed liquor of this organic solvent have high ionic conductivity, high dielectric constant and low viscosity simultaneously.
In a preferred embodiment of the invention, above-mentioned lithium salts is selected from LiPF 6, LiBF 4, LiSbF 6, LiAsF 6, LiN (SO 2cF 3) 2, LiN (SO 2c 2f 5) 2, LiC (SO 2cF 3) 3with LiN (SO 2f) 2in one or more, described lithium salts preferably LiPF 6or LiPF 6with the mixture of other lithium salts.
In a preferred embodiment of the invention, above-mentioned electrolyte also comprises additive, this additive be selected from vinylene carbonate, PS, fluorinated ethylene carbonate and vinyl ethylene carbonate one or more.
Above-mentioned film for additive can form more stable SEI film on graphite cathode surface, thus significantly improves the cycle performance of lithium ion battery.
One embodiment of the invention provide a kind of lithium ion battery, the barrier film comprising positive pole, negative pole and be placed between positive pole and negative pole, also comprise the non-aqueous electrolyte for lithium ion cell of first aspect.
In a preferred embodiment of the invention, above-mentioned positive pole is selected from LiCoO 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, wherein, M be selected from Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti one or more, and 0≤y≤1,0≤x≤1,0≤z≤1, x+y+z≤1.
In a preferred embodiment of the invention, above-mentioned positive pole is selected from the coated LiCoO of metal oxide 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, above-mentioned metal oxide be selected from aluminium oxide, titanium oxide, zirconia, magnesium oxide, calcium oxide, antimony oxide, bismuth oxide, zinc oxide, nickel oxide, iron oxide one or more.
In a preferred embodiment of the invention, the charge cutoff voltage of above-mentioned lithium ion battery is more than or equal to 4.35V.
Describe the present invention below by way of specific embodiment.Should be appreciated that these embodiments are only exemplary, do not form limiting the scope of the invention.
Embodiment 1
1) preparation of electrolyte
By ethylene carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) in mass ratio for EC:DEC:EMC=1:1:1 mixes, then add lithium hexafluoro phosphate (LiPF 6) be 1mol/L to molar concentration, then add compound 1 (compound 1 referred in specific embodiment, the compound 2 by the gross mass 1% of electrolyte ... refer to the compound of as above enumerated reference numeral, below each example in like manner).
2) preparation of positive plate
By the quality of 93:4:3 lithium LiCoO sourer than blended anode active material cobalt 2, then they are dispersed in METHYLPYRROLIDONE (NMP), obtain anode sizing agent by conductive carbon black Super-P and binding agent polyvinylidene fluoride (PVDF).Be uniformly coated on by slurry on the two sides of aluminium foil, through drying, calendering and vacuumize, and burn-on after aluminum lead-out wire with supersonic welder and obtain positive plate, the thickness of pole plate is at 120-150 μm.
3) preparation of negative plate
By the mass ratio mixing negative active core-shell material Delanium of 94:1:2.5:2.5, conductive carbon black Super-P, binding agent butadiene-styrene rubber (SBR) and carboxymethyl cellulose (CMC), then by their dispersions in deionized water, obtain cathode size.Be coated on by slurry on the two sides of Copper Foil, through drying, calendering and vacuumize, and burn-on after nickel making outlet with supersonic welder and obtain negative plate, the thickness of pole plate is at 120-150 μm.
4) preparation of battery core
Between positive plate and negative plate, place thickness is that the polyethene microporous membrane of 20 μm is as barrier film, then the sandwich structure that positive plate, negative plate and barrier film form is reeled, square aluminum metal-back is put into after being flattened by coiling body again, the lead-out wire of both positive and negative polarity is welded on the relevant position of cover plate respectively, and with laser-beam welding machine, cover plate and metal-back are welded as a whole, obtain the battery core treating fluid injection.
5) battery core fluid injection and change into
In the glove box that dew point controls below-40 DEG C, the electrolyte of above-mentioned preparation is injected battery core by liquid injection hole, and the amount of electrolyte will ensure the space be full of in battery core.Then change into according to the following steps: 0.05C constant current charge 3min, 0.2C constant current charge 5min, 0.5C constant current charge 25min, after shelving 1hr, shaping is sealed, then further with the electric current constant current charge of 0.2C to 4.35V, after normal temperature shelf 24hr, with the electric current constant-current discharge of 0.2C to 3.0V.
6) normal-temperature circulating performance test
At room temperature with the electric current constant current charge of 1C to 4.35V, then constant voltage charge drops to 0.1C to electric current, then with the electric current constant-current discharge of 1C to 3.0V, so circulation 300 weeks, record the discharge capacity of the 1st week and the discharge capacity of the 300th week, be calculated as follows the capability retention of normal temperature circulation:
The discharge capacity * 100% of discharge capacity/1st of capability retention=300th week week
7) 45 DEG C of cycle performance tests
At 45 DEG C with the electric current constant current charge of 1C to 4.35V, then constant voltage charge drops to 0.1C to electric current, then with the electric current constant-current discharge of 1C to 3.0V, record first week discharge capacity, circulation like this 300 weeks, record the discharge capacity of the 1st week and the discharge capacity of the 300th week, be calculated as follows the capability retention of 45 DEG C of circulations:
The discharge capacity * 100% of discharge capacity/1st of capability retention=300th week week
8) high-temperature storage performance test
At room temperature with the electric current constant current charge of 1C to 4.35V, then constant voltage charge drops to 0.1C to electric current, then with the electric current constant-current discharge of 1C to 3.0V, record discharge capacity; Then at room temperature with the electric current constant current charge of 1C to 4.35V, then constant voltage charge drops to 0.1C to electric current, store 7 days at 60 DEG C again, then at room temperature with the electric current constant-current discharge of 1C to 3.0V, maintenance discharge capacity after record high-temperature storage, then at room temperature with the electric current constant current charge of 1C to 4.35V, then constant voltage charge drops to 0.1C to electric current, then with the electric current constant-current discharge of 1C to 3.0V, recovery discharge capacity after record high-temperature storage, is calculated as follows the capability retention after high temperature storage and capacity restoration rate:
Maintenance discharge capacity * 100% after discharge capacity/high temperature storage before capability retention=high temperature storage
Recovery discharge capacity * 100% after discharge capacity/high temperature storage before capacity restoration rate=high temperature storage
Embodiment 2
Except the compound 2 in the preparation of electrolyte, the compound 1 of 1% being changed into 1%, other is identical with embodiment 1, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Embodiment 3
Except the compound 3 in the preparation of electrolyte, the compound 1 of 1% being changed into 1%, other is identical with embodiment 1, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Embodiment 4
Except the compound 4 in the preparation of electrolyte, the compound 1 of 1% being changed into 1%, other is identical with embodiment 1, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Embodiment 5
Except the compound 2 in the preparation of electrolyte, the compound 2 of 1% being changed into 0.1%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Embodiment 6
Except the compound 2 in the preparation of electrolyte, the compound 2 of 1% being changed into 2%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Embodiment 7
Except the compound 2 in the preparation of electrolyte, the compound 2 of 1% being changed into 5%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Comparative example 1
Except not adding except compound 1 in the preparation of electrolyte, other is identical with embodiment 1, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 1.
Table 1
As can be seen from the data of table 1, compared with not adding the electrolyte of compound 1,2,3 or 4, the high-temperature storage performance and the high temperature cyclic performance that with the addition of the electrolyte of these compounds significantly improve.
Embodiment 8
Except the vinylene carbonate (VC) of interpolation 1% extra in the preparation of electrolyte, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Embodiment 9
Except the fluorinated ethylene carbonate (FEC) of interpolation 1% extra in the preparation of electrolyte, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Embodiment 10
Except the vinyl ethylene carbonate (VEC) of interpolation 1% extra in the preparation of electrolyte, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 45 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Comparative example 2
Except the vinylene carbonate (VC) in the preparation of electrolyte, the compound 2 of 1% being changed into 1%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 25 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Comparative example 3
Except the fluorinated ethylene carbonate (FEC) in the preparation of electrolyte, the compound 2 of 1% being changed into 1%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 25 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Comparative example 4
Except the vinyl ethylene carbonate (VEC) in the preparation of electrolyte, the compound 2 of 1% being changed into 1%, other is identical with embodiment 2, tests the data of normal-temperature circulating performance, 25 DEG C of cycle performances and the high-temperature storage performance obtained in table 2.
Table 2
As can be seen from the data of table 2, on the basis of adding VC, FEC or VEC, add compound 2 further and battery can be made to obtain better high-temperature storage performance and high temperature cyclic performance.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.

Claims (9)

1. a high-voltage lithium ion batteries nonaqueous electrolytic solution, is characterized in that, comprises non-aqueous organic solvent, lithium salts and is selected from the two nitrile compounds shown in structural formula 1,
Wherein, n is the natural number of 1-4.
2. high-voltage lithium ion batteries nonaqueous electrolytic solution according to claim 1, is characterized in that, the two nitrile compounds shown in described structural formula 1 account for 0.1% ~ 5% of described electrolyte total weight.
3. high-voltage lithium ion batteries nonaqueous electrolytic solution according to claim 1, it is characterized in that, described non-aqueous organic solvent is the mixture of cyclic carbonate and linear carbonate, described cyclic carbonate be selected from ethylene carbonate, propene carbonate and butylene one or more, described linear carbonate be selected from dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate one or more.
4. non-aqueous electrolyte for lithium ion cell according to claim 1, is characterized in that, described lithium salts is selected from LiPF 6, LiBF 4, LiSbF 6, LiAsF 6, LiN (SO 2cF 3) 2, LiN (SO 2c 2f 5) 2, LiC (SO 2cF 3) 3with LiN (SO 2f) 2in one or more.
5. non-aqueous electrolyte for lithium ion cell according to claim 1, it is characterized in that, described electrolyte also comprises additive, described additive be selected from vinylene carbonate, PS, fluorinated ethylene carbonate and vinyl ethylene carbonate one or more.
6. a lithium ion battery, the barrier film comprising positive pole, negative pole and be placed between positive pole and negative pole, is characterized in that, also comprises the non-aqueous electrolyte for lithium ion cell described in claim 1 to 5 any one.
7. lithium ion battery according to claim 6, is characterized in that, described positive pole is selected from LiCoO 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, wherein, M be selected from Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti one or more, and 0≤y≤1,0≤x≤1,0≤z≤1, x+y+z≤1.
8. lithium ion battery according to claim 6, is characterized in that, described positive pole is selected from the coated LiCoO of metal oxide 2, LiNiO 2, LiCo 1-ym yo 2, LiNi 1-ym yo 2, LiMn 2-ym yo 4and LiNi xco ymn zm 1-x-y-zo 2in one or more, described metal oxide be selected from aluminium oxide, titanium oxide, zirconia, magnesium oxide, calcium oxide, antimony oxide, bismuth oxide, zinc oxide, nickel oxide, iron oxide one or more.
9. the lithium ion battery according to claim 6 or 7 or 8, it is characterized in that, the charge cutoff voltage of described lithium ion battery is more than or equal to 4.35V.
CN201510481545.3A 2015-08-03 2015-08-03 Nonaqueous electrolyte for high-voltage lithium-ion battery and lithium-ion battery Pending CN105140565A (en)

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CN114221035A (en) * 2021-12-13 2022-03-22 上海瑞浦青创新能源有限公司 Ternary lithium ion secondary battery
CN114300735A (en) * 2021-11-26 2022-04-08 深圳新宙邦科技股份有限公司 Lithium secondary battery

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