CN110364695A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN110364695A CN110364695A CN201810322643.6A CN201810322643A CN110364695A CN 110364695 A CN110364695 A CN 110364695A CN 201810322643 A CN201810322643 A CN 201810322643A CN 110364695 A CN110364695 A CN 110364695A
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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
- H01M10/056—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
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
Abstract
This application provides lithium ion battery, which includes: anode, and the anode includes positive electrode, and the positive electrode includes the particle containing lithium compound and the inorganic compound that the particle surface is arranged in；Cathode；Isolation film；Electrolyte, the electrolyte include sulfuric acid vinyl ester and nitrile compound.Above-mentioned positive electrode under high voltages, can effectively inhibit the destruction of cathode material structure and the oxygenolysis of electrolyte, can be obviously improved the cycle performance and security performance of lithium ion battery under high voltage in conjunction with electrolyte, synergistic effect.
Description
Technical field
This application involves energy technology fields, specifically, being related to lithium ion battery.
Background technique
With the technological progress and market development in smart phone, unmanned plane and electric car field, people are to cell performance
The requirement of energy is higher and higher.The advantages that lithium ion battery is high with energy density, have extended cycle life, memory-less effect, becomes application
Mainstream battery in above-mentioned field.Currently, improving energy density and security performance is the two big main of high performance lithium ion battery
Research direction.Improve operating voltage and using novel high-energy density material be improve lithium ion battery energy density it is effective
Approach.Although novel high-energy density lithium ion battery material has been extensive research hotspot, still in phase of basic research,
Improving operating voltage is still to improve the important channel of battery energy density.
Currently, the operating voltage of commercialized lithium ion battery is lower, and if battery is under high voltage, the oxygen of positive electrode
Change activity increases, structure is easily destroyed, while electrolyte is also easily decomposed under high voltages, is particularly susceptible in positive electrode surface
Electrochemical oxidation reactions occur, positive impedance increase, electrolyte is caused to consume rapidly, flatulence deteriorates the performances such as circulating battery
Meanwhile also reducing the safety of battery.
Thus, current lithium ion battery still has much room for improvement.
Summary of the invention
The application is intended to solve at least some of the technical problems in related technologies.For this purpose, the application
One purpose is to propose that a kind of operating voltage is higher, safety is higher, cycle performance is preferable or the higher lithium of energy density
Ion battery.
In the one aspect of the application, this application provides a kind of lithium ion batteries.The lithium ion battery includes: anode,
The anode includes positive electrode, and the positive electrode includes the particle containing lithium compound and the surface that the particle is arranged in
Inorganic compound；Cathode；Isolation film；Electrolyte, the electrolyte include sulfuric acid vinyl ester and nitrile compound.Invention human hair
Existing, above-mentioned positive electrode is in conjunction with electrolyte, synergistic effect, under high voltages, can effectively inhibit the broken of cathode material structure
Bad and electrolyte oxygenolysis, can be obviously improved the cycle performance and security performance of lithium ion battery under high voltage, in turn
So that lithium ion battery operating voltage with higher or higher energy density, preferable security performance and higher
Application value.
According to an embodiment of the present application, the electrolyte further includes chain fluoro carbonic ester shown in formula 1,
Wherein R1Selected from carbon atom number be 1-6 alkyl or carbon atom number be 1-6 fluoro-alkyl, R2It is selected from carbon atom number
1-6 fluoro-alkyl.The flash-point of chain fluoro carbonic ester is high, and oxidative resistance is good, and chain fluoro carbonic ester is added in the electrolytic solution can
To improve the flash-point and inoxidizability of electrolyte, and then improve cycle performance, thermal stability and the security performance of lithium ion battery.
According to an embodiment of the present application, the chain fluoro carbonic ester is selected from one of following organic matter or a variety of:
The chain fluoro carbonic ester with above structure is added in electrolyte as a result, improve electrolyte flash-point and
Antioxidative better effect, can make the cycle performance of lithium ion battery, and thermal stability and security performance are higher.
According to an embodiment of the present application, the gross mass based on the electrolyte, the quality hundred of the chain fluoro carbonic ester
Divide than being 5%~40%.As a result, relative to other contents, the chain fluoro carbonic ester of above-mentioned mass fraction is added to electrolysis
The thermal stability of electrolyte can be more significantly improved in liquid, and then more significantly improves the cycle performance of lithium ion battery, safety
Energy.
According to an embodiment of the present application, the nitrile compound has structural formula shown in formula 2:
Wherein, it is 2~6 that A, which is selected from naphthenic base, carbon atom number that alkyl, carbon atom number that carbon atom number is 1~6 are 3~12,
Alkylene, carbon atom number be 6~12 cyclic olefin base, R3、R4It is former to be independently selected from hydrogen atom, cyano, itrile group or carbon
The alkyl that subnumber is 1~8；X1、X2、X3It is independently selected from CH2, O, CFH or CF2, n1、n2、n3It is independently selected from 0-10
Integer.It is possible thereby to which the electrode to lithium ion battery is effectively protected, improve the cycle performance of lithium ion battery.
According to an embodiment of the present application, the nitrile compound is selected from one of following organic matter or a variety of:
The Absorptive complex wave that above-mentioned nitrile compound can be closer as a result, is on the surface of positive electrode, so that positive electrode
Structure is not easy to be destroyed, and significantly more efficient can keep apart electrolyte and positive electrode surface, makes electrode and electrolyte
Interface is more stable, the positive oxidation to electrolyte of lithium ion battery when reducing Charging state, so as to improve lithium ion battery
Cycle performance.
According to an embodiment of the present application, the gross mass based on the electrolyte, the mass percent of the nitrile compound are
0.5%~10%.As a result, compared to other contents, the addition of the nitrile compound of above-mentioned mass fraction is more advantageous in positive material
Expect that surface forms complex compound, cover active site, inhibits positive electrode surface to the oxidation of electrolyte, advantage under high voltages
It is more obvious, the lithium ion battery obtained is worked under high voltages, energy density is higher.
According to an embodiment of the present application, the gross mass based on the electrolyte, the mass percent of the sulfuric acid vinyl ester
It is 0.5%~3%.As a result, compared to other contents, the sulfuric acid vinyl ester of above-mentioned mass fraction can be formed more in pole piece
Add stable interfacial film, more effectively inhibit the generation of side reaction, prevents the consumption of electrolyte and the damage of capacity in cyclic process
It loses, cycle performance can be significantly improved by being added into lithium ion battery, extend the service life of lithium ion battery.
According to an embodiment of the present application, the electrolyte further includes fluorinated ethylene carbonate, vinylene carbonate, dioxalic acid
One of lithium borate is a variety of.Fluorinated ethylene carbonate and vinylene carbonate have preferable filming performance as a result,
So that material structure is not easy to be destroyed, dioxalic acid lithium borate containing conjugated structure due to making it have preferably heat
Stability, and dioxalic acid lithium borate can participate in anode and cathode film formation, and anode and cathode can be protected to be not easy to be destroyed simultaneously, mentioned
The high-temperature behavior of high-lithium ion battery, it is environmentally friendly.
According to an embodiment of the present application, the electrolyte includes lithium salts, and the lithium salts is selected from inorganic lithium salt and organic lithium salt
One of or it is a variety of, the lithium salts be selected from lithium hexafluoro phosphate, LiBF4, hexafluoroarsenate lithium, lithium perchlorate, difluorophosphoric acid
One of lithium, double fluorine sulfimide lithiums and double trifluoromethanesulfonimide lithiums are a variety of.LiBF4 is nontoxic and pacify as a result,
Entirely, hexafluoroarsenate lithium conductivity is high, and cathode film formation performance is strong, double trifluoromethanesulfonimide lithium better heat stabilities, conductance
Rate is higher, and the one or more of above-mentioned lithium salts, which are added in electrolyte, can make the stability of electrolyte preferable, peace
Full performance is higher.
According to an embodiment of the present application, the concentration of the lithium salts is 0.5M~1.5M, according to an embodiment of the present application, described
Lithium salt is 0.8M~1.2M.Lithium salt can make the transference number of ions of electrolyte higher within the above range as a result,
Conductivity is higher, and viscosity is appropriate, and then the cycle performance and high rate performance of lithium ion battery can be improved.
According to an embodiment of the present application, the particle containing lithium compound is selected from LiNix1Co1-x1O2、
LiNix2MnyCo1-x2-yO2、LiCoO2One of or it is a variety of, wherein 0.5≤x1≤ 0.8, for LiNix2MnyCo1-x2-
yO2, 0≤x2≤ 0.8,0 < y≤0.3,0 < x2+ y < 1.
According to an embodiment of the present application, the inorganic compound includes selected from least one of following element: Al, Mg,
Zr,Ge,In,Ti,Zn.The surface that above-mentioned inorganic compound is coated on the particle containing lithium compound can effectively be covered as a result,
The active site due to caused by fault of construction of the particle surface containing lithium compound is covered, the grain containing lithium compound is significantly reduced
The side reaction that sublist face and electrolyte occur, while the particle structure containing lithium compound can also be inhibited to destroy, effectively prevent
The dissolution of transition metal in particle containing lithium compound, the metal reduced in the particle containing lithium compound are made in cathode deposition
At security risk.
According to an embodiment of the present application, the element in the inorganic compound accounts for the mass percentage of positive electrode and is
0.01%~3%.As a result, compared to other contents, above-mentioned inorganic compound is coated on to the table of the particle containing lithium compound
Face can make the security performance of lithium ion battery and cycle performance higher.
Specific embodiment
Embodiments herein is described below in detail.The embodiments described below is exemplary, and is only used for explaining this Shen
Please, it should not be understood as the limitation to the application.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or conditions or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
The application is following understanding based on inventor and discovery and completes:
Under high voltages, the oxidisability of positive electrode enhances lithium ion battery, and especially positive electrode surface is due to structure
The presence of defect easily occurs side reaction with electrolyte, positive impedance increase, electrolyte is caused to consume rapidly, is deteriorating battery
While the performances such as circulation, a series of safety problem is also brought.In view of the above technical problems, inventor has carried out deep grind
Study carefully, found after research, can be coated on positive electrode surface using covering material, so that positive electrode surface is due to fault of construction
Caused active site is wrapped by, and can reduce the side reaction of positive electrode surface and electrolyte in this way, while inhibiting just
Pole material structure destroy, reduce positive electrode in metal security risk caused by cathode deposition, meanwhile, in order to enable lithium from
Sub- battery can steady operation under high voltages, the higher additive of thermal stability can be added in the electrolytic solution, as a result, upper
Under the comprehensive function for stating the modified positive electrode of covering material and electrolyte, compared to the positive material modified without using covering material
Material or the electrolyte without containing above-mentioned additive, can be effectively improved the cycle performance of lithium ion battery under high voltages, together
When lithium ion battery thermal stability and security performance also increase.
In view of this, this application provides a kind of lithium ion batteries in the one aspect of the application.The lithium ion battery packet
Include: anode, the anode include positive electrode, and the positive electrode includes the particle containing lithium compound and is arranged in the grain
Inorganic compound on sublist face；Cathode；Isolation film；Electrolyte, the electrolyte include sulfuric acid vinyl ester and nitrile compound.Hair
Bright people has found, is coated with the cladded type positive electrode and thermal stability of inorganic compound in the lithium ion battery using surface simultaneously
Higher electrolyte, the two combine, act synergistically, and under high voltages, can effectively inhibit destruction and the electricity of cathode material structure
The oxygenolysis of liquid is solved, and then the cycle performance and security performance of lithium ion battery under high voltage can be obviously improved.Specifically,
The cathode material structure of cladded type is survivable, and the sulfuric acid vinyl ester in electrolyte can form stable interface in pole piece
Film inhibits the generation of side reaction, prevents the consumption of electrolyte and the loss of capacity in cyclic process, can improve lithium ion battery
Cycle performance, nitrile compound can with Absorptive complex wave on the surface of positive electrode, so that the structure of positive electrode is not easy to be destroyed,
And can effectively keep apart electrolyte and positive electrode surface, the interface of electrode and electrolyte is more stable, thus by upper
Positive electrode is stated to be used in combination with electrolyte so that lithium ion battery operating voltage with higher or higher energy are close
Degree, preferable security performance and higher application value.
According to an embodiment of the present application, the organic solvent includes chain fluoro carbonic ester shown in formula 1,
Wherein, R1Selected from carbon atom number be 1-6 alkyl or carbon atom number be 1-6 fluoro-alkyl, R2It is selected from carbon atom number
1-6 fluoro-alkyl.The flash-point of chain fluoro carbonic ester is higher as a result, and oxidative resistance is preferable, and chain fluoro is added in the electrolytic solution
Carbonic ester can be improved the flash-point and inoxidizability of electrolyte, so improve the cycle performance of lithium ion battery, thermal stability and
Security performance.
According to an embodiment of the present application, the chain fluoro carbonic ester is selected from one of following organic matter or a variety of:
The chain fluoro carbonic ester with above structure is added in electrolyte as a result, improve electrolyte flash-point and
Antioxidative better effect can make the cycle performance, thermal stability and security performance of lithium ion battery higher.According to this
Some embodiments of application, fluorine atom amount is less in chain fluoro carbonic ester, the fluorine-containing pair generated in cyclic process as a result,
Product is less, and interfacial film is more stable.
According to an embodiment of the present application, in order to further increase the stability of interfacial film, total matter based on the electrolyte
Amount, the mass percent of the chain fluoro carbonic ester is 5%~40%, for example, the gross mass based on the electrolyte, described
The mass percent of chain fluoro carbonic ester can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% etc..By
The chain fluoro carbonic ester of above-mentioned mass fraction is added in electrolyte compared to other contents and improves the steady of interfacial film by this
Qualitative better effect, and then the better effect of the thermal stability of electrolyte is improved, so that the cycle performance of lithium ion battery, peace
Full performance is more preferably.In some embodiments of the present application, based on the gross mass of the electrolyte, the chain fluoro carbonic ester
Mass percent be 10%~30%, thus, it is possible to significantly improve interfacial film stability and electrolyte thermal stability more
Good, the cycle performance of lithium ion battery, security performance are more preferably.When the mass percent of chain fluoro carbonic ester is excessively high, lithium salts
Meltage it is less, the capacity of lithium ion battery is smaller, so that the cycle performance of lithium ion battery is compared to chain fluoro
The performance when mass percent of carbonic ester is 5%~40% is declined, but is an advantage over chain fluoro carbonic ester and packet not
Cover the cycle performance for the lithium ion battery that type positive electrode is used cooperatively；When the mass percent of chain fluoro carbonic ester is too low
When, the thermal stability of electrolyte is bad, so that quality hundred of the cycle performance of lithium ion battery compared to chain fluoro carbonic ester
Performance when dividing than being 5%~40% is declined, and safety is lower, but is an advantage over chain fluoro carbonic ester and cladded type not
The cycle performance for the lithium ion battery that positive electrode is used cooperatively.
According to an embodiment of the present application, the electrolyte includes chain fluoro carbonic ester shown in formula 1 and selected from carbonic acid
Vinyl acetate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), γ-
Butyrolactone (BL), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), ethyl acetate (EA) and tetrahydrofuran
One of (THF) or it is a variety of.
According to an embodiment of the present application, in the nitrile compound in additive nitrile functionality lone pair electrons energy level and lithium ion
The energy level of the vacant track of transition metal atoms outermost layer is close in cell positive material, so that the organic molecule containing nitrile functionality can
Absorptive complex wave occurs in positive electrode surface.The organic molecule for being adsorbed on positive electrode surface can be well by oxidizable group in electrolyte
Part separates with positive electrode surface, greatly reduces oxidation of the lithium ion cell positive surface to electrolyte of Charging state, thus
Improve the cycle performance of lithium ion battery.
According to an embodiment of the present application, the nitrile compound has structural formula shown in formula 2:
Wherein, it is 2~6 that A, which is selected from naphthenic base, carbon atom number that alkyl, carbon atom number that carbon atom number is 1~6 are 3~12,
Alkylene, carbon atom number be 6~12 cyclic olefin base, R3、R4It is former to be independently selected from hydrogen atom, cyano, itrile group or carbon
The alkyl that subnumber is 1~8；X1、X2、X3It is independently selected from CH2, O, CFH or CF2, n1、n2、n3It is independently selected from 0-10
Integer.Thus, it is possible to which the electrode to lithium ion battery is effectively protected, improve the cycle performance of lithium ion battery.Root
According to embodiments herein, the nitrile compound is selected from one of following organic matter or a variety of:
The surface for being adsorbed on positive electrode that above-mentioned nitrile compound can be even closer as a result, so that the knot of positive electrode
Structure is not easy to be destroyed, and significantly more efficient can keep apart electrolyte and positive electrode surface, the interface of electrode and electrolyte
It is more stable, the positive oxidation to electrolyte of lithium ion battery when reducing Charging state, so as to improve following for lithium ion battery
Ring performance.
According to an embodiment of the present application, in order to further increase the thermal stability of lithium ion battery, it is based on the electrolyte
Gross mass, the mass percent of the nitrile compound is 0.5%~10%, such as the gross mass based on the electrolyte, nitrile
The mass percent of compound can for 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%,
5.5%, 6%, 6.5%, 7.5%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10% etc..As a result, compared to other contents, on
The addition for stating the nitrile compound of mass fraction, which is more advantageous to, forms complex compound on positive electrode surface, can almost cover whole work
Property site, inhibit positive electrode surface to the oxidation of electrolyte, advantage under high voltages is more obvious so that obtain lithium from
Sub- battery can work under high voltages, and energy density is higher.When the mass percent of nitrile compound is lower, it is not enough to cover
The active site on positive electrode surface inhibits quality percentage of the positive electrode surface to the oxidation of electrolyte compared to nitrile compound
It is poor when than being 0.5%~10%, but inhibit positive electrode surface to the oxidation of electrolyte better than not by nitrile compound and packet
Cover the lithium ion battery of type positive electrode combination；When the mass percent of nitrile compound is higher, it will act on battery middle reaches
From copper ion be deposited on anode surface, inhibit the insertion of lithium ion, and then deteriorate the cycle performance of battery.
According to an embodiment of the present application, the structural formula of sulfuric acid vinyl ester (DTD) is as follows:And it is based on the electrolysis
The gross mass of liquid, the mass percent of the sulfuric acid vinyl ester is 0.5%~3%, such as the gross mass based on the electrolyte,
The mass percent of sulfuric acid vinyl ester can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3% etc..Contain as a result, compared to other
The sulfuric acid vinyl ester of amount, above-mentioned mass fraction can form more stable interfacial film in negative terminal surface, inhibit the hair of side reaction
It is raw, the consumption of electrolyte and the loss of capacity in cyclic process are prevented, is added into lithium ion battery to significantly improve and follow
Ring performance extends the service life of lithium ion battery.When the content of DTD is too low, it is unfavorable for forming interfacial film in negative terminal surface,
It is bad when to inhibit the effect of side reaction compared with the mass percent of sulfuric acid vinyl ester be 0.5%~3%, but it is an advantage over sulfuric acid second not
Effect when enester is used in combination with cladded type positive electrode；When the too high levels of DTD, form a film in negative terminal surface thicker, no
Pass through conducive to lithium ion, increase lithium ion transfer impedance, Capacity fading is accelerated, but the property when too high levels of DTD
It can be better than effect when sulfuric acid vinyl ester not being used in combination with cladded type positive electrode.
According to an embodiment of the present application, in order to further increase the thermal stability of lithium ion battery, the electrolyte may be used also
With include selected from one of fluorinated ethylene carbonate (FEC), vinylene carbonate (VC) and dioxalic acid lithium borate (LiBOB) or
It is a variety of.Fluoro ethylene carbonate and vinylene carbonate have preferable filming performance as a result, so that active material structure is not easy
It is destroyed, dioxalic acid lithium borate containing conjugated structure due to making it with preferable thermal stability, and dioxalic acid lithium borate meeting
Anode and cathode film formation are participated in, anode and cathode can be protected to be not easy to be destroyed simultaneously, improve the high-temperature behavior of lithium ion battery,
And it is environmentally friendly.
According to an embodiment of the present application, the electrolyte includes lithium salts, and the lithium salts is selected from inorganic lithium salt and organic lithium salt
One of or it is a variety of.According to some embodiments of the present application, the lithium salts is selected from lithium hexafluoro phosphate (LiPF6), tetrafluoro boric acid
Lithium (LiBF4), hexafluoroarsenate lithium (LiAsF6), lithium perchlorate (LiClO4), difluorophosphate (LiPO2F2), double fluorine sulfimides
One of lithium (LiFSI) and double trifluoromethanesulfonimide lithiums (LiTFSI) are a variety of.LiBF4 is nontoxic and pacify as a result,
Entirely；Hexafluoroarsenate lithium conductivity is high, and cathode film formation performance is strong；Double trifluoromethanesulfonimide lithium better heat stabilities, conductance
Rate is higher；The filming performance of lithium hexafluoro phosphate is preferable, and conductivity is higher, nontoxic, environmentally friendly, and comprehensive performance is preferable；It will be upper
The one or more for stating lithium salts, which are added in electrolyte, can make the stability of electrolyte preferable, and security performance is higher, makes
It is preferable with performance.According to some specific examples of the application, the lithium salts is selected from lithium hexafluoro phosphate.Lithium salts is comprehensive as a result,
It can be preferably.
According to an embodiment of the present application, the concentration of lithium salts be 0.5M~1.5M, such as lithium salts concentration can for 0.5M,
0.6M, 0.7M, 0.8M, 0.9M, 1.0M, 1.1M, 1.2M, 1.3M, 1.4M, 1.5M etc..Lithium salt is within the above range as a result,
The transference number of ions of electrolyte can be made higher, conductivity is higher, and viscosity is appropriate, and then lithium ion battery can be improved
Cycle performance and high rate performance.According to some embodiments of the present application, the concentration of lithium salts is 0.8M~1.2M.Electrolyte as a result,
Transference number of ions is higher, and more preferably, conductivity is higher for viscosity, so that the cycle performance and high rate performance of lithium ion battery are more preferably.When
When lithium salt is too low, transference number of ions is lower, and conductivity is lower；When lithium salt is excessively high, electrolysis fluid viscosity is larger, causes
Ion mobility reduces, conductivity decline.
According to an embodiment of the present application, the particle containing lithium compound in positive electrode is selected from LiNix1Co1-x1O2、
LiNix2MnyCo1-x2-yO2、LiCoO2One of or it is a variety of, wherein 0.5≤x1≤ 0.8,0≤x2≤ 0.8,0 y≤0.3 <,
0 < x2+ y < 1；For LiNix2MnyCo1-x2The ratio of-yO2, Ni/Mn/Co are selected from 1/1/1-8/1/1.According to the application's
Embodiment, the inorganic compound in positive electrode include selected from least one of following element: Al, Mg, Zr, Ge, In, Ti,
Zn.Inorganic compound can be the entirety of particle of the covering containing lithium compound, or grain of the covering containing lithium compound
The partial region in sublist face.The surface that above-mentioned inorganic compound overlays on the particle containing lithium compound can effectively be covered as a result,
Cover the active site due to caused by fault of construction of the particle surface containing lithium compound, greatly reduce positive electrode surface with
The side reaction that electrolyte occurs, while cathode material structure can also be inhibited to destroy, metal is molten effectively in prevention positive electrode
Out, metal security risk caused by cathode deposition in positive electrode is reduced.
According to an embodiment of the present application, in order to obtain preferable effect, the element in the inorganic compound accounts for positive material
The mass percentage of material accounts for the mass percentage of positive electrode for the element in 0.01%~3%, such as inorganic compound
It can be 0.01%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3% etc..Above-mentioned inorganic compound is coated on as a result,
The security performance and cycle performance of lithium ion battery can be improved in particle surface containing lithium compound.According to some of the application
Embodiment, based on the gross mass of the positive electrode, the mass percentage of element contained by the inorganic compound is 0.05%
~1%.The better effect of lithium ion battery safety performance and cycle performance is improved as a result,.The element contained by the inorganic compound
It is unobvious to the covering improvement result of positive electrode surface defect when mass percentage is too low, under high voltages to positive electrode
Structural stability compared to element contained by inorganic compound mass percentage be 0.01%~3% when obviously do not change
It is kind, but it is an advantage over effect when the particle containing lithium compound that inorganic compound coats not being used in combination with above-mentioned electrolyte
Fruit；When the mass percentage of the element contained by the inorganic compound is excessively high, it can be substantially reduced the capacity of lithium ion battery, and then make
Loop attenuation accelerates, but the performance when mass percentage of element contained by inorganic compound is excessively high is better than not by cladded type just
Effect when pole material is used in combination with above-mentioned electrolyte.
According to an embodiment of the present application, above-mentioned electrolyte and above-mentioned positive electrode are used in combination, specifically, can be by fluorine
High heat stability can be formed by being used in combination and adding into electrolyte for linear carbonate and nitrile compound and sulfuric acid vinyl ester
Property electrolyte, can be effectively improved the stability of electrode/electrolyte interface under high voltages；It is modified just in combination with metallic cover
Pole material inhibits cathode material structure to destroy under high voltages, improves the stability and safety of battery under high voltages for comprehensive
Property.
According to an embodiment of the present application, anode in addition to include mentioned-above positive electrode, can also include binder and
Conductive agent.According to an embodiment of the present application, the material of binder and conductive agent is not particularly limited, as long as can satisfy requirement,
Those skilled in the art can flexible choice according to actual needs.Such as formed binder material can for butadiene-styrene rubber or
Polyvinylidene fluoride etc., the material for forming conductive agent can be conductive black (Supper P) etc..In actual use, it can incite somebody to action
Anode is processed into positive plate, specific: positive electrode, conductive agent, binder are made in N-Methyl pyrrolidone (NMP) solvent
At anode sizing agent；Anode sizing agent is uniformly coated in current collector aluminum foil with the 90% of capacity of negative plates；It dries, be cold-pressed and be cut into
The shape needed.It is simple, convenient as a result, it is easy to accomplish.
According to an embodiment of the present application, cathode includes negative electrode active material, binder and conductive agent, negative electrode active material
Material is not particularly limited, as long as can satisfy requirement, those skilled in the art can flexible choice according to actual needs.Such as
Negative electrode material can be graphite, amorphous carbon, nano-silicon or nitride etc..According to an embodiment of the present application, it binder and leads
The material of electric agent is not particularly limited, as long as can satisfy requirement, those skilled in the art can flexibly select according to actual needs
It selects.Such as formed binder material the material of conductive agent for butadiene-styrene rubber or polyvinylidene fluoride etc., can be formed can be with
For conductive black etc..The activity of negative electrode material is higher as a result, and service performance is preferable.According to an embodiment of the present application, actually make
Cathode can be processed into positive plate by the used time, specific: by negative electrode active material, conductive agent, thickener, bonding agent go from
It is uniformly mixed in sub- water, negative electrode slurry is made；Negative electrode slurry is coated on copper foil of affluxion body；It dries, be cold-pressed and be cut into needs
Shape.
According to an embodiment of the present application, the material and type of isolation film are not particularly limited, as long as can satisfy requirement, this
Field technical staff can flexible choice according to actual needs.Such as isolation film can be for by materials systems such as polyethylene, polypropylene
Microporous barrier, composite membrane, diaphragm paper, the laminate etc. obtained, isolation film has excellent mechanical property, chemical stability, valence as a result,
Lattice are lower, and service performance is preferable.According to an embodiment of the present application, the thickness of isolation film is not particularly limited, those skilled in the art
Member can carry out flexible choice according to actual needs, no longer excessively repeat herein.
According to an embodiment of the present application, lithium ion battery further includes plus plate current-collecting body and negative current collector and other routines
The structure that lithium ion battery should have, and the material of plus plate current-collecting body and negative current collector is not particularly limited, as long as can
It meets the requirements, those skilled in the art can flexible choice according to actual needs.Such as plus plate current-collecting body can use aluminium foil etc.,
Negative current collector can be using copper foil etc..
According to an embodiment of the present application, in common lithium-ion batteries, the thermal stability of electrolyte is poor, anode exposure
Active site it is more so that electrolyte consumption rapidly, positive impedance is larger, and cycle performance is bad, and there are security risks.And
In the application, inorganic compound modified anode material is used in anode, and by its nitrile compound and the electricity of sulfuric acid vinyl ester
Solution liquid uses simultaneously, can be effectively improved the stability of electrode/electrolyte interface under high voltages, and cathode material structure is inhibited to exist
It is destroyed under high voltage, it is comprehensive to improve the stability and safety of battery under high voltages.
Embodiment
Below using the particle containing lithium compound as cobalt acid lithium, inorganic compound includes that element is Al or Zr, chain fluorine
It is organic matter 6, organic matter 12, organic matter 15 or organic matter 30 for carbonic ester, nitrile compound is organic matter 31, organic matter 32, has
It is illustrated for machine object 33 or organic matter 34, it should be noted that the following examples are only for illustrating the present application, and cannot manage
Solution is the limitation to the application.In following embodiments, comparative example, reagent, material and the instrument used is such as without spy
Different explanation, commercially available or synthesis obtain.
Embodiment 1
1, the preparation of positive plate
By positive electrode, conductive agent Super P, binder polyvinylidene fluoride (PVDF) in N-Methyl pyrrolidone
(NMP) anode sizing agent is made in stirring in solvent, and wherein the particle in positive electrode containing lithium compound is LiCoO2, inorganic chemical
Object includes that element is Zr, and the gross mass based on positive electrode, the mass percentage of Zr is 0.5%.Solid contains in anode sizing agent
Amount is 77wt%, positive electrode in solid component, conductive agent Super P and PVDF mass ratio be 97.8:1:1.2.It will be positive
Slurry is uniformly coated in current collector aluminum foil with the 90% of capacity of negative plates；It is cold-pressed after being dried at 85 DEG C；Then it is cut
After side, cut-parts, slitting, 4h is dried under 85 DEG C of vacuum condition, based lithium-ion battery positive plate is made.
3, the preparation of negative electrode tab
It will be as the graphite of negative electrode active material and conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), viscous
It connects agent butadiene-styrene rubber (SBR) to be uniformly mixed in deionized water, negative electrode slurry is made.In negative electrode slurry, solid in negative electrode slurry
Content is 49wt%, graphite in solid component, conductive agent Super P, CMC and SBR mass ratio be 97.7:1:0.3:1.It will bear
Pole slurry is coated on copper foil of affluxion body and dries at 85 DEG C；Then after carrying out trimming, cut-parts, slitting, in 120 DEG C of vacuum items
12h is dried under part, anode plate for lithium ionic cell is made.
4, the preparation of electrolyte:
The preparation of electrolyte carries out in dry argon atmosphere.
By ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC), propyl propionate (PP), with mass ratio
EC:PC:DEC:PP=10:15:35:20 mixing, the gross mass based on electrolyte add 2% organic matter 31 and 1%DTD,
It dissolves and is uniformly mixed, finally by lithium salts lithium hexafluoro phosphate (LiPF6) be dissolved in mixed liquor, the concentration of lithium salts is 1.15mol/
L is to get the electrolyte.
5, the preparation of lithium ion battery:
Using 6 μm of polyethylene films (PE) as isolation film.In order by positive plate obtained above, diaphragm, negative electrode tab
It folds, is in isolation film among positive/negative plate, it is rolled to obtain naked battery core；Naked battery core is placed in aluminum plastic film outsourcing after soldering polar ear
In dress, the electrolyte of above-mentioned preparation is injected into the lithium ion battery after drying, by encapsulation, standing, chemical conversion, (0.02C is permanent
Current charge completes the preparation (Soft Roll of lithium ion battery to 3.3V, then with 0.1C constant-current charge to 3.6V), shaping, volume test
Thickness 3.3mm, the width 39mm, length 96mm of battery).
Embodiment 2~6,31~32
It is consistent with the preparation method of embodiment 1, unlike: inorganic compound includes the type and content of element, kind
Class and changes of contents are referring to table 1.
Embodiment 7~10,33~34
It is consistent with the preparation method of embodiment 1, unlike: the variation of 31 content of organic matter, changes of contents is referring to table
1.Embodiment 11~13,35~36
It is consistent with the preparation method of embodiment 1, unlike: the variation of DTD content, changes of contents is referring to table 1.
Embodiment 14~19
It is consistent with the preparation method of embodiment 1, unlike: it also include chain fluoro carbonic ester, chain fluorine in electrolyte
For the type and content variation reference table 1 of carbonic ester.
Embodiment 20~22
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12, organic matter 32, organic matter 34 or organic matter 33+ organic matter 34 substitute organic matter 31, and type variation is referring to table
1。
Embodiment 23
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12, organic matter 33 substitutes organic matter 31, and the content of DTD is 0.5%.
Embodiment 24
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12,2% FEC.
Embodiment 25
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12,2% FEC, organic matter 33 substitute organic matter 31.
Embodiment 26
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12 and 2% FEC, the content of DTD is 0.5%.
Embodiment 27
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12 and 0.5% VC.
Embodiment 28
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12 and 0.5% LiBOB.
Embodiment 29
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
Organic matter 12,2% FEC and 0.5% VC.
Embodiment 30
It is consistent with the preparation method of embodiment 1, unlike: it is based on electrolyte gross mass, also includes 20% in electrolyte
12,2% FEC of organic matter, 0.5% VC and 0.5% LiBOB.
Comparative example 1
It is consistent with the preparation method of embodiment 1, unlike: positive inorganic compound includes that the content of element is 0.5%,
When preparing electrolyte, by ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC), propyl propionate (PP) with
Mass ratio EC:PC:DEC:PP=10:15:35:20 mixing, is then uniformly mixed, finally by lithium salts lithium hexafluoro phosphate (LiPF6)
It is dissolved in mixed liquor, the concentration of lithium salts is 1.15mol/L to get the electrolyte.
Comparative example 2
It is consistent with the preparation method of comparative example 1, unlike: it is based on electrolyte gross mass, also includes 2% in electrolyte
Organic matter 31.
Comparative example 3
It is consistent with the preparation method of comparative example 1, unlike: it is based on electrolyte gross mass, also includes 1% in electrolyte
DTD。
Comparative example 4
It is consistent with the preparation method of comparative example 1, unlike: the positive particle surface containing lithium compound is without inorganic chemical
Object, is based on electrolyte gross mass, also includes the DTD of 2% organic matter 31 and 1% in electrolyte.
It should be noted that the mass percent of solvent refers to each solvent based on organic in the various embodiments described above and comparative example
The gross mass of solvent calculates obtained mass percent, and the mass percent of each additive refers to that the additive amount of each additive is based on
The gross mass of electrolyte calculates obtained mass percent.
Covering material and content and electrolyte organic solvent, additive types and mass percent in 1 embodiment of table
Covering material and content and electrolyte organic solvent, additive types and mass percent in 2 comparative example of table
Cycle performance and hot tank performance are carried out to the lithium ion battery of Examples 1 to 36 and comparative example 1~4 respectively
(Hotbox) it tests, the specific test method is as follows:
Cycle performance test:
Lithium ion battery is placed in 25 DEG C of insulating boxs, 20 minutes is stood, lithium ion battery is made to reach constant temperature.With 0.7C perseverance
Current charge is to 4.4V, and constant-voltage charge to electric current is 0.05C, and then with 1C constant-current discharge to 3.0V, above-mentioned is that a charge and discharge follow
Ring.Charge and discharge cycles are repeated for 100% in capacity to discharge for the first time, until stopping surveying when discharge capacity decays to 80%
Examination records circulating ring number, the index as evaluation cycle performance of lithium ion battery.
Cycle performance of the lithium ion battery at 45 DEG C is tested simultaneously, test method is tested with above-mentioned 25 DEG C of cycle performances.
Hotbox test:
Lithium ion battery is placed in 25 DEG C of insulating boxs, 20 minutes is stood, lithium ion battery is made to reach constant temperature.With 0.5C perseverance
Stream is discharged to 3V, stands 5min, and then with 0.5C constant-current charge to 4.5V, then constant-voltage charge to electric current is 0.05C, is made at battery
In 100% charged state.In 25 DEG C of insulating boxs, 60 minutes are stood, open-circuit voltage (OCV) before record is tested, impedance (IMP),
It checks appearance and takes pictures.150 DEG C ± 2 DEG C are warming up to 5 DEG C/min ± 2 DEG C/min rate, and keeps 60min.It observes and records
The state of sample during the test continues to observe 20min after failure.After terminating test, OCV, IMP are recorded, checks appearance simultaneously
It takes pictures.If not on fire, do not explode, otherwise lithium ion battery does not pass through test by test.Every group test respectively 20 lithiums from
Sub- battery, percent of pass are denoted as: passing through battery number/battery sum.
All embodiments and the test result of comparative example cycle performance and Hotbox are as shown in table 3.
Table 3
In above-mentioned table 3, comparative example 4, Examples 1 to 6 and embodiment 31~32 are compared it is found that positive electrode cladding Al or
After Zr, while security performance gets a promotion, cycle performance is also improved, and wherein the performance of Zr is more excellent.Zr covering amount is
0.01%~3%.When the covering amount of Al or Zr is lower, the defect sites of positive electrode cannot be covered effectively, and covering amount
When higher, the capacity of positive electrode is suppressed, and loop attenuation is very fast.
Comparative example 3, embodiment 7~10 and embodiment 33-34 are compared it is found that the addition of nitrile compound significantly improves battery
Cycle performance, content range be 0.5%~10%, the addition of nitrile compound be conducive to positive electrode surface formed be complexed
Object covers active site, inhibits positive electrode surface to the oxidation of electrolyte, especially this advantage is brighter under high voltages
It is aobvious.When nitrile compound is less, it is not enough to cover positive electrode surface active site, when the amount of nitrile compound reaches to a certain degree,
By the active site of substantially all complexing positive electrode surface.
Comparative example 2, embodiment 11~13 and embodiment 35-36 are compared it is found that the addition of DTD can also improve following for battery
Ring performance, content 0.5%-3%.The addition of DTD improves the cycle performance of battery, this is because DTD can be in negative terminal surface shape
At stable interfacial film, inhibit the generation of side reaction, but DTD content it is higher when, form a film in negative terminal surface thicker, be unfavorable for lithium
Ion passes through, and increases lithium ion transfer impedance, and Capacity fading is accelerated.
By comparative example 1 and implements 4~23 and compare it is found that the electrolyte of nitrile compound, DTD and fluorinated solvents is added, in conjunction with
Positive electrode surface coating technology can improve cycle performance of battery and security performance simultaneously.
Embodiment 1 and embodiment 14~19 are compared it is found that the addition of chain fluoro carbonic ester can significantly improve battery
Security performance.When the content of chain fluoro carbonic ester is too low or excessively high in organic solvent, the cycle performance of battery is declined,
Specifically, the advantage of thermal stability cannot play when the content of chain fluoro carbonic ester is lower, and work as chain fluoro carbon
When acid and esters content is higher, the meltage of lithium salts is limited, and the capacity of battery is also restrained.The content of chain fluoro carbonic ester is
5%~40%.
By embodiment 14 and embodiment 24~30 compares it is found that fluorinated ethylene carbonate, vinylene carbonate and dioxalic acid
The cycle performance and security performance that can further increase battery of lithium borate.This is because fluorinated ethylene carbonate and carbonic acid are sub-
Vinyl acetate has preferable cathode film formation performance, so that negative electrode material is not easy to be destroyed, dioxalic acid lithium borate is due to containing conjugation
Structure makes it with preferable thermal stability, and dioxalic acid lithium borate can participate in anode and cathode film formation, can protect simultaneously
Anode and cathode are not easy to be destroyed, and improve the high-temperature behavior of lithium ion battery, environmentally friendly.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although embodiments herein has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be understood as the limitation to the application, those skilled in the art within the scope of application can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (12)
1. a kind of lithium ion battery, comprising:
Anode, the anode include positive electrode, and the positive electrode includes the particle containing lithium compound and is arranged described
The inorganic compound of particle surface；
Electrolyte, the electrolyte include sulfuric acid vinyl ester and nitrile compound.
2. lithium ion battery according to claim 1, wherein the electrolyte further includes chain fluoro carbon shown in formula 1
Acid esters,
Wherein, R1Selected from carbon atom number be 1-6 alkyl or carbon atom number be 1-6 fluoro-alkyl, R2It is 1-6 selected from carbon atom number
Fluoro-alkyl.
3. lithium ion battery according to claim 2, wherein the chain fluoro carbonic ester is in following organic matter
It is one or more:
4. lithium ion battery according to claim 2, wherein the gross mass based on the electrolyte, the chain fluoro
The mass percent of carbonic ester is 5%~40%.
5. lithium ion battery according to claim 1, wherein the nitrile compound has structural formula shown in formula 2:
Wherein, A is selected from the alkene that naphthenic base, carbon atom number that alkyl, carbon atom number that carbon atom number is 1~6 are 3~12 are 2~6
Alkyl, the cyclic olefin base that carbon atom number is 6~12, R3、R4It is independently selected from hydrogen atom, cyano, itrile group or carbon atom number
For 1~8 alkyl；X1、X2、X3It is independently selected from CH2, O, CFH or CF2, n1、n2、n3It is independently selected from the whole of 0-10
Number.
6. lithium ion battery according to claim 5, wherein the nitrile compound be selected from one of following organic matter or
It is a variety of:
7. lithium ion battery according to claim 1, wherein the gross mass based on the electrolyte, the nitrile compound
Mass percent be 0.5%~10%.
8. lithium ion battery according to claim 1, wherein the gross mass based on the electrolyte, the sulfuric acid ethylene
The mass percent of ester is 0.5%~3%.
9. lithium ion battery according to claim 1, wherein the electrolyte further includes fluorinated ethylene carbonate, carbonic acid
One of vinylene and dioxalic acid lithium borate are a variety of.
10. lithium ion battery according to claim 1, the particle containing lithium compound is selected from LiNix1Co1-x1O2、
LiNix2MnyCo1-x2-yO2、LiCoO2One of or it is a variety of, wherein 0.5≤x1≤ 0.8,0≤x2≤ 0.8,0 y≤0.3 <,
0 < x2+ y < 1.
11. lithium ion battery according to claim 1, the inorganic compound includes at least one in following element
Kind: Al, Mg, Zr, Ge, In, Ti, Zn.
12. lithium ion battery according to claim 11, wherein the element in the inorganic compound accounts for positive electrode
Mass percentage is 0.01%~3%.
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| CN107293792A (en) * | 2017-08-21 | 2017-10-24 | 宁波诺丁汉大学 | A kind of nonaqueous electrolytic solution and nickelic tertiary cathode material battery |
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| CN111244541A (en) * | 2020-01-20 | 2020-06-05 | 宁德新能源科技有限公司 | Electrolyte solution and electrochemical device using the same |
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| CN112670579B (en) * | 2020-12-23 | 2022-02-25 | 东莞新能源科技有限公司 | Electrolyte solution, electrochemical device, and electronic device |
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