CN106099185A - A kind of electrolyte and include the lithium ion battery of this electrolyte - Google Patents
A kind of electrolyte and include the lithium ion battery of this electrolyte Download PDFInfo
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- CN106099185A CN106099185A CN201610523736.6A CN201610523736A CN106099185A CN 106099185 A CN106099185 A CN 106099185A CN 201610523736 A CN201610523736 A CN 201610523736A CN 106099185 A CN106099185 A CN 106099185A
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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
- H01M10/05—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
- H01M10/42—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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- 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
nullThe invention discloses a kind of electrolyte and include the lithium ion battery of this electrolyte，On the basis of traditional electrolyte，Additive system is optimized improvement，Develop a kind of combined additive，Described additive includes fluoro carbonic ester and hexamethylene three nitrile，Wherein，The quality of described fluoro carbonic ester accounts for the 0.1 10% of electrolyte gross mass，The quality of hexamethylene three nitrile accounts for the 0.1 10% of electrolyte gross mass，Hexamethylene three nitrile can form complex at positive electrode surface effectively，Effectively prevent transition metal dissolution，And then promote storage and the cycle performance of high voltage battery core，Simultaneously，Lifting along with current potential，Solvent in electrolyte、Additive non-oxidizability is also one of direction being badly in need of improvement，Fluoro carbonic ester electrochemical window is high，The non-oxidizability of electrolyte can be improved，To sum up，Electrolyte of the present invention can be effectively improved the circulation of (more than the 4.40V) under high voltages of lithium ion battery、High temperature storage、The performance of the aspects such as safety.
Description
Technical field
The present invention relates to technical field of lithium batteries, particularly relate to a kind of electrolyte and include the lithium-ion electric of this electrolyte
Pond.
Background technology
Lithium ion battery has open-circuit voltage height, specific capacity is big, have extended cycle life, security performance is good, self discharge is little, application
Wide ranges, memory-less effect, the advantage such as pollution-free, as New Green Battery, be the most widely used in consumer electronics and produced
In product, and the most energetically to field development such as national defense industry, space technology, electric automobile and standing type stand-by power supplies.Along with just
Take the extensive utilization of formula electronic product, the especially civilian 3C consumer electronics product such as smart mobile phone, notebook field, market pair
There have been higher requirement the use time of lithium ion battery, the i.e. energy density of lithium ion battery, therefore pursue high performance energy
Density has become as one of most important direction of lithium ion battery development.
The performance of lithium ion battery is good and bad to be selected most important with electrode material performance, it may be said that the performance of electrode material is excellent
The bad performance quality determining lithium ion battery.In order to obtain higher lithium battery capacity under limited volume, except attempting
Use outside thinner barrier film, Copper Foil, aluminium foil, use high-performance, the positive and negative pole material of high power capacity to be an up energy density more
Crucial factor.Positive electrode aspect typically promotes the energy in terms of positive electrode by the charging voltage of lifting battery at present
Density, it may be said that High-Voltage Technology is one of mainstream technology of positive electrode current lifting energy density.But it is accompanied by carrying of voltage
Rising, anodic potentials raises and the oxidisability of positive pole is promoted, and electrolyte traditional under high potential has been difficult to meet client's
Use demand, is mainly manifested in storage and cycle performance aspect, and therefore developing high performance high-voltage electrolyte is high voltage skill
The trend that art develops further.
Summary of the invention
The technical problem to be solved is to provide a kind of electrolyte and includes the lithium ion battery of this electrolyte.
The technical solution used in the present invention is:
A kind of electrolyte, including organic solvent, lithium salts and additive, described additive includes fluoro carbonic ester and hexamethylene
Three nitriles, wherein, the quality of described fluoro carbonic ester accounts for the 0.1-10% of electrolyte gross mass, and the quality of hexamethylene three nitrile accounts for electrolyte
The 0.1-10% of gross mass, shown in the structural formula of described fluoro carbonic ester such as formula (I),
Wherein, R1、R2It is respectively the alkyl that end is fluorine-containing.
In further preferred embodiment, implement R1、R2Structural formula respectively such as formula (II), formula (III) or formula (IV)
Shown in,
Wherein, R3、R4、R5It is respectively and replaces or unsubstituted alkyl.
In some specific embodiments, described additive also includes adiponitrile, and it is total that the quality of adiponitrile accounts for electrolyte
The 0.1-10% of quality.
In some specific embodiments, the quality of described fluoro carbonic ester accounts for the 4-8% of electrolyte gross mass.
In some specific embodiments, described electrolyte also includes fluorinated ethylene carbonate, fluoro ethylene carbonate
The quality of ester accounts for the 0.1-10% of electrolyte gross mass.
In some specific embodiments, described electrolyte also includes vinylene carbonate, vinylene carbonate
Quality accounts for the 0.1-3% of electrolyte gross mass.
Some preferred embodiment in, the quality of vinylene carbonate accounts for the 0.5-1% of electrolyte gross mass.
In some specific embodiments, described electrolyte also includes propane sultone, the quality of propane sultone
Account for the 0.1-7% of electrolyte gross mass.
In some specific embodiments, described organic solvent is ethylene carbonate, ethylene carbonate, carbonic acid diformazan
One or more in ester, diethyl carbonate, Ethyl methyl carbonate, r-butyrolactone, methyl formate, Ethyl formate.
In some specific embodiments, described lithium salts is lithium hexafluoro phosphate, LiBF4, hexafluoroarsenate lithium, height
Lithium chlorate, trifluoro sulphonyl lithium, two (trimethyl fluoride sulfonyl) imine lithium, double (fluorine sulphonyl) imine lithium or three (trimethyl fluoride sulfonyl) first
One or more in base lithium.
The invention provides a kind of lithium ion battery, including electrolyte as above.
The invention has the beneficial effects as follows:
Along with the lifting of lithium ion charging voltage, having had higher requirement to electrolyte, traditional electrolyte uses at 4.40V
Under above high voltage system, poor-performing in terms of high temperature storage, cycle performance and security performance, the present invention is exactly to pass
On the basis of system electrolyte, additive system is optimized improvement, develops a kind of combined additive, described additive wraps
Including fluoro carbonic ester and hexamethylene three nitrile, wherein, the quality of described fluoro carbonic ester accounts for the 0.1-10% of electrolyte gross mass, hexamethylene
The quality of three nitriles accounts for the 0.1-10% of electrolyte gross mass, and hexamethylene three nitrile can form complex at positive electrode surface effectively, has
Effect prevent transition metal dissolution, and then promote storage and the cycle performance of high voltage battery core, meanwhile, along with the lifting of current potential,
In electrolyte, solvent, additive non-oxidizability are also one of directions being badly in need of improvement, and fluoro carbonic ester electrochemical window is high, it is possible to
Improving the non-oxidizability of electrolyte, to sum up, electrolyte of the present invention can be effectively improved lithium ion battery under high voltages
The performance of the aspects such as the circulation of (more than 4.40V), high temperature storage, safety.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further elaborated.Those skilled in the art in the invention also may be used
So that following detailed description of the invention is carried out suitable change or amendment, therefore the application is not limited to following embodiment,
Some modifications and changes of the present invention also should be fallen in the claims of the present invention.
Embodiment 1:
(1) electrolyte is prepared
By each material shown in table 1 and addition thereof, numbering carries out organizing test more, takes the fluoro carbon of different quality respectively
Acid esters, hexamethylene three nitrile, adiponitrile, fluorinated ethylene carbonate, vinylene carbonate, propane sultone and lithium salts are dissolved in organic solvent
In, mix homogeneously, obtain organizing electrolyte more, in table 1, addition refers to that each material accounts for the mass fraction of electrolyte gross mass.Its
In, the structural formula of described fluoro carbonic ester isWherein, R1、R2It is respectively end fluorine-containing
Alkyl, described organic solvent is ethylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, Ethyl methyl carbonate, r-
One or more in butyrolactone, methyl formate, Ethyl formate.Described lithium salts is lithium hexafluoro phosphate, LiBF4, hexafluoro
Arsenic acid lithium, lithium perchlorate, trifluoro sulphonyl lithium, two (trimethyl fluoride sulfonyl) imine lithium, double (fluorine sulphonyl) imine lithium or three (fluoroforms
Base sulphonyl) one or more in lithium methide.In a preferred embodiment, R1、R2It is respectively the alkane of the fluorine-containing C1-10 of end
Base, in the present embodiment, R1ForR2ForDescribed organic solvent is ethylene carbonate: carbonic acid diethyl
Ester: Ethyl methyl carbonate volume ratio is the mixed solvent of 1:1:1, described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L.
In above-mentioned electrolyte, described lithium salts has no particular limits, and can select according to the actual requirements, and lithium salts is dense
Degree is 0.8～1.4mol/L, the most preferably 1.1mol/L, and solvent species has no particular limits, can be according to actual need
Selecting, electrolyte configuration is without particular limitation, as long as by the mixed material mix homogeneously in electrolyte.Can first root
According to selected material addition, being first dissolved in solvent by lithium salts, then add additives in mixed liquor, stir shape
Become final electrolyte system.
The material of each test group of table 1 and containing scale
(2) lithium ion battery is prepared
Prepared by positive plate: by cobalt acid lithium (LCO): CNT (CNT): Kynoar (PVDF)=98.4:0.8:0.8
Mix, add N-Methyl pyrrolidone (NMP) and stir under conditions of vacuum, control slurry viscosity 6000 ±
After 1000mPa s, slurry is coated on aluminium foil, after coating machine is dried, colds pressing, divide bar, spot welding lug, rubberizing to obtain
Positive plate.
Prepared by negative plate: by C:SP: carboxymethyl cellulose (CMC): butadiene-styrene rubber (SBR)=96:1:1.5:1.5 mixes
Closing, add deionized water and stir, last vacuum defoamation, control slurry viscosity is after 3500 ± 1000mPa s, by slurry
It is coated on Copper Foil, after coating machine is dried, colds pressing, divide bar, spot welding lug, rubberizing to obtain negative plate.
Lithium ion battery assembling, chemical conversion, two envelopes: positive/negative plate is wound together with barrier film, the core that winding is completed
Putting into plastic-aluminum shell, top side seal, rebake, moisture Control is within 200ppm, then is injected separately into test 1-7 and contrast 1-4
Electrolyte, then seal, static 36h, chemical conversion, degasification, two envelope molding, partial volume obtains lithium ion battery, and records each electricity
The capacity data in pond.
(3) normal-temperature circulating performance test
Respectively the lithium ion battery of each test group of the electrolyte being filled with test 1-7 and contrast 1-4 is carried out room temperature
Cycle performance is tested.The battery that the above embodiments, comparative example electrolyte are made, with the electric current constant current constant voltage full charge of 0.7C,
Cut-off current 0.02C, shelves 10min, then is discharged to 3.0V with 0.5C, shelve 10min, and completing above work step is 1 week, circulate with
Upper work step 500 weeks, tests the internal resistance of battery, capacity, the capacity of final 500 weeks just can obtain divided by capacity first capacity and protect
Holdup, DCO result such as table 2 below.It will be seen that test 1-7 compares with contrast 1 from table 2, it can be seen that with the addition of
After additive, cycle performance is significantly improved, because when including described combined additive in the electrolytic solution, and electrolyte
After injecting lithium ion battery, lithium ion battery can form compactness in formation process on the both positive and negative polarity surface of lithium ion battery
Good, stable skin covering of the surface, the lithium ion battery of gained have under 4.40V high voltage system good circulation, high temperature storage and
Security performance；Test 7 is compared with contrast 2, and hexamethylene three nitrile and fluoro carbonic ester combined effect are better than single fluoro carbonic ester
Effect；Test 7 with contrast compared with 3, hexamethylene three nitrile and fluoro carbonic ester combined effect are better than fluoro carbonic ester and adiponitrile
Combined effect；Test 2, test 6, compared with contrast 4, are added fluoro carbonic ester and can effectively be improved cycle performance, exist optimal
Addition；Hexamethylene three nitrile and adiponitrile content all can promote cycle performance, but both combined effects are better than single use ring
Oneself three nitriles and effect of adiponitrile.
The lithium ion battery normal-temperature circulating performance test result of each test group of table 2
| Numbering | 500 weeks internal resistance gaining rates of room temperature | Room temperature is capability retention after 500 weeks |
| Test 1 | 80.87% | 71.37% |
| Test 2 | 58.87% | 92.32% |
| Test 3 | 59.46% | 90.19% |
| Test 4 | 61.64% | 88.15% |
| Test 5 | 59.32% | 91.68% |
| Test 6 | 62.32% | 91.46% |
| Test 7 | 63.43% | 87.87% |
| Contrast 1 | 91.32% | 32.38% |
| Contrast 2 | 87.65% | 67.65% |
| Contrast 3 | 67.32% | 85.56% |
| Contrast 4 | 67.68% | 85.12% |
(4) 60 DEG C of 30d storage tests
Respectively the lithium ion battery of each test group of the electrolyte being filled with test 1-7 and contrast 1-4 is carried out 60 DEG C
Storage in 30 days: by the lithium ion battery of each test group with the electric current constant current constant voltage full charge of 0.5C, cut-off current 0.02C, test
The thickness of battery, voltage, internal resistance, be shelved on the battery of full charge in the baking oven of 60 DEG C 30 days, test electricity after having shelved
The hot thickness in pond, after treating battery cooling, re-test point this voltage, internal resistance, then with 0.5C by battery discharge to 3.0V, institute
Obtain capacity and be residual capacity, then with 0.5C discharge and recharge 3 weeks, the capacity data recording the 3rd week was recovery capacity.Each test group
The DCO result such as table 3 below of lithium ion battery.It will be seen that use additive package system to high temperature 60 from table 3
DEG C storage has greatly improved, and conclusion is basically identical with cycle performance.
60 DEG C of 30d of the high-temperature lithium ion battery of each test group of table 3 store result table
(5) overcharge safety energy
Respectively the lithium ion battery of each test group of the electrolyte being filled with test 1-7 and contrast 1-4 is overcharged
Security performance is tested: with the electric current constant-current discharge of 0.5C to 3.0V, then shelve 10min, then the electric current constant-current constant-voltage charging with 1C
To 6V, cut-off current is 0A, and the time is 5h, the battery core surface temperature situation in recording process, each scheme test 5pcs battery,
DCO result such as table 4 below.Knowable to the result table of table 4, after combined additive adds, to the security performance of battery core
Promoting, when testing 1C6V, all there is not phenomenon on fire in battery, especially during fluoro carbonic ester content height, and battery core surface temperature
Minimum, security performance is best, mainly due to fluoro carbonic ester after fluoro, has higher electrochemical window, stable
Property good, flash-point is high.
The lithium ion battery overcharge safety energy test result of each test group of table 4
| Scheme sequence number | During temperature peak (DEG C) | Battery status after test |
| Test 1 | 76.86 | 5pcs battery No leakage, without on fire |
| Test 2 | 73.48 | 5pcs battery No leakage, without on fire |
| Test 3 | 74.12 | 5pcs battery No leakage, without on fire |
| Test 4 | 73.98 | 5pcs battery No leakage, without on fire |
| Test 5 | 74.12 | 5pcs battery No leakage, without on fire |
| Test 6 | 71.87 | 5pcs battery No leakage, without on fire |
| Test 7 | 73.87 | 5pcs battery No leakage, without on fire |
| Contrast 1 | 263.43 | 5pcs battery is the most on fire |
| Contrast 2 | Battery core 78.76 the most on fire | 2/5pcs is on fire |
| Contrast 3 | 73.91 | 5pcs battery No leakage, without on fire |
| Contrast 4 | 77.28 | 5pcs battery No leakage, without on fire |
Embodiment 2:
Take ethylene carbonate: diethyl carbonate: Ethyl methyl carbonate volume ratio is that the mixed solvent of 1:1:1 is as organic molten
Agent, is added thereto to lithium salts, and described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L, obtains electrolyte mother solution.According to table 5
Shown each material and addition thereof, add each material respectively in electrolyte mother solution, and in table, addition is that each material accounts for total electrolysis
The mass fraction of liquid quality, obtains electrolyte sample 1-6.
The each material of table 5 and addition thereof
Take the battery core of non-fluid injection, be injected separately into electrolyte sample 1-6, then the battery core that will complete, use 0.5C constant current
Constant voltage full charge is 0.02C to 4.5V, current cut-off, battery core is disassembled in glove box, moisture in glove box, oxygen content all≤
10ppm, after taking out corresponding positive plate, then is positioned over positive plate in the plastic-aluminum shell bag containing corresponding electrolyte, then by plastic-aluminum
Film encapsulate, isolate moisture, take out plastic-aluminum shell bag, put into 70 DEG C of baking ovens 2 days, then with ICP test plastic-aluminum shell bag in metallic cobalt from
The content of son.Test result such as table 6.
Table 6 electrolyte sample 1-6 metal ion content test result
From the result of metallic cobalt Ion release, it will be seen that fluoro ether carbonic ester is high due to electrochemical window, right
Metal-lithium ion dissolution has certain effect, but substantially effective not as good as nitrile.Owing to nitrile can be on positive pole cobalt acid lithium surface
Forming complex, suppress digestion of metallic ion, therefore the effect of hexamethylene three nitrile is more preferable than adiponitrile effect, simultaneously it was also found that two
It is optimal for planting nitrile and combining the obstruction effect to the dissolution of metal ion, it may be possible to due to the difference of two kinds of additive molecule structures
Different, that production capacity is certain synergy, it will be apparent that improving the effect of suppression digestion of metallic ion, above-mentioned experimental data is the most final
Proving, the effect of this combined additive is optimum.
Embodiment 3:
Take fluoro carbonic ester, hexamethylene three nitrile, adiponitrile, fluorinated ethylene carbonate, vinylene carbonate, propane sultone and
Lithium salts is dissolved in organic solvent, and mix homogeneously obtains electrolyte, and wherein, the structural formula of described fluoro carbonic ester isWherein, R1ForR2ForDescribed fluoro carbonic acid
The quality of ester accounts for the 0.1% of electrolyte gross mass, and the quality of hexamethylene three nitrile accounts for the 10% of electrolyte gross mass, fluoro ethylene carbonate
The quality of ester accounts for the 0.1% of electrolyte gross mass, and the quality of vinylene carbonate accounts for the 3% of electrolyte gross mass, in propane sulfonic acid
The quality of ester accounts for the 0.1% of electrolyte gross mass.Described organic solvent is ethylene carbonate: diethyl carbonate: Ethyl methyl carbonate
Volume ratio is the mixed solvent of 1:1:1, and described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L.According to conventional fabrication process
Preparation battery core, takes the battery core of produced non-fluid injection, injects electrolyte, sealing, static 36h, chemical conversion, degasification, two envelope molding, divides
Hold and obtain lithium ion battery.
Embodiment 4:
Take fluoro carbonic ester, hexamethylene three nitrile, adiponitrile, fluorinated ethylene carbonate, vinylene carbonate, propane sultone and
Lithium salts is dissolved in organic solvent, and mix homogeneously obtains electrolyte, and wherein, the structural formula of described fluoro carbonic ester isWherein, R1ForR2ForDescribed fluoro carbonic ester
Quality account for the 10% of electrolyte gross mass, the quality of hexamethylene three nitrile accounts for the 0.1% of electrolyte gross mass, fluorinated ethylene carbonate
Quality account for the 10% of electrolyte gross mass, the quality of vinylene carbonate accounts for the 0.1% of electrolyte gross mass, propane sultone
Quality account for the 7% of electrolyte gross mass.Described organic solvent is ethylene carbonate: diethyl carbonate: Ethyl methyl carbonate volume
Than the mixed solvent for 1:1:1, described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L.Prepare according to conventional fabrication process
Battery core, takes the battery core of produced non-fluid injection, injects electrolyte, sealing, static 36h, and chemical conversion, degasification, two envelope molding, partial volume obtains
To lithium ion battery.
Embodiment 5:
Take fluoro carbonic ester, hexamethylene three nitrile, adiponitrile, fluorinated ethylene carbonate, vinylene carbonate, propane sultone and
Lithium salts is dissolved in organic solvent, and mix homogeneously obtains electrolyte, and wherein, the structural formula of described fluoro carbonic ester isWherein, R1ForR2ForDescribed fluoro carbonic ester
Quality account for the 5% of electrolyte gross mass, the quality of hexamethylene three nitrile accounts for the 5% of electrolyte gross mass, fluorinated ethylene carbonate
Quality accounts for the 4% of electrolyte gross mass, and the quality of vinylene carbonate accounts for the 3% of electrolyte gross mass, the matter of propane sultone
Amount accounts for the 3% of electrolyte gross mass.Described organic solvent is ethylene carbonate: diethyl carbonate: Ethyl methyl carbonate volume ratio is
The mixed solvent of 1:1:1, described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L.Battery core is prepared according to conventional fabrication process,
Taking the battery core of produced non-fluid injection, inject electrolyte, sealing, static 36h, chemical conversion, degasification, two envelope molding, partial volume obtains lithium
Ion battery.
Embodiment 6:
Take fluoro carbonic ester, hexamethylene three nitrile, adiponitrile, fluorinated ethylene carbonate, vinylene carbonate, propane sultone and
Lithium salts is dissolved in organic solvent, and mix homogeneously obtains electrolyte, and wherein, the structural formula of described fluoro carbonic ester isWherein, R1ForR2ForDescribed fluoro carbonic ester
Quality account for the 5% of electrolyte gross mass, the quality of hexamethylene three nitrile accounts for the 3% of electrolyte gross mass, fluorinated ethylene carbonate
Quality accounts for the 8% of electrolyte gross mass, and the quality of vinylene carbonate accounts for the 3% of electrolyte gross mass, the matter of propane sultone
Amount accounts for the 2% of electrolyte gross mass.Described organic solvent is ethylene carbonate: diethyl carbonate: Ethyl methyl carbonate volume ratio is
The mixed solvent of 1:1:1, described lithium salts is lithium hexafluoro phosphate, and concentration is 1.1mol/L.Battery core is prepared according to conventional fabrication process,
Taking the battery core of produced non-fluid injection, inject electrolyte, sealing, static 36h, chemical conversion, degasification, two envelope molding, partial volume obtains lithium
Ion battery.
Claims (10)
1. an electrolyte, it is characterised in that include that organic solvent, lithium salts and additive, described additive include fluoro carbon
Acid esters and hexamethylene three nitrile, wherein, the quality of described fluoro carbonic ester accounts for the 0.1-10% of electrolyte gross mass, the matter of hexamethylene three nitrile
Amount accounts for the 0.1-10% of electrolyte gross mass, shown in the structural formula of described fluoro carbonic ester such as formula (I),
Wherein, R1、R2It is respectively the alkyl that end is fluorine-containing.
Electrolyte the most according to claim 1, it is characterised in that described additive also includes adiponitrile, the matter of adiponitrile
Amount accounts for the 0.1-10% of electrolyte gross mass.
Electrolyte the most according to claim 1, it is characterised in that the quality of described fluoro carbonic ester accounts for electrolyte gross mass
4-8%.
Electrolyte the most according to claim 1, it is characterised in that also include fluorinated ethylene carbonate in described electrolyte,
The quality of fluorinated ethylene carbonate accounts for the 0.1-10% of electrolyte gross mass.
Electrolyte the most according to claim 1, it is characterised in that also include vinylene carbonate, carbon in described electrolyte
The quality of acid vinylene accounts for the 0.1-3% of electrolyte gross mass.
Electrolyte the most according to claim 5, it is characterised in that the quality of vinylene carbonate accounts for electrolyte gross mass
0.5-1%.
Electrolyte the most according to claim 1, it is characterised in that also include propane sultone, the third sulphur in described electrolyte
The quality of acid lactone accounts for the 0.1-7% of electrolyte gross mass.
Electrolyte the most according to claim 1, it is characterised in that described organic solvent is ethylene carbonate, ethylene carbonate
One in ester, dimethyl carbonate, diethyl carbonate, Ethyl methyl carbonate, r-butyrolactone, methyl formate, Ethyl formate or many
Kind.
Electrolyte the most according to claim 1, it is characterised in that described lithium salts be lithium hexafluoro phosphate, LiBF4, six
Fluorine arsenic acid lithium, lithium perchlorate, trifluoro sulphonyl lithium, two (trimethyl fluoride sulfonyl) imine lithium, double (fluorine sulphonyl) imine lithium or three (trifluoros
Sulfonyloxy methyl) one or more in lithium methide.
10. a lithium ion battery, it is characterised in that include the electrolyte as described in any one of claim 1-9.
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| CN108232300A (en) * | 2018-01-05 | 2018-06-29 | 宁德新能源科技有限公司 | A kind of lithium ion battery and its electrolyte |
| CN109301326A (en) * | 2018-09-21 | 2019-02-01 | 宁德新能源科技有限公司 | A kind of electrolyte and electrochemical appliance |
| CN110364695A (en) * | 2018-04-11 | 2019-10-22 | 宁德新能源科技有限公司 | Lithium ion battery |
| CN110582883A (en) * | 2017-08-24 | 2019-12-17 | 株式会社Lg化学 | Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same |
| US11024884B2 (en) | 2018-09-21 | 2021-06-01 | Ningde Amperex Technology Limited | Electrolyte and electrochemical device comprising the same |
| US11031626B2 (en) | 2018-09-21 | 2021-06-08 | Ningde Amperex Technology Limited | Electrolytic solution and electrochemical device containing the same |
| CN113396501A (en) * | 2019-02-07 | 2021-09-14 | 三星Sdi株式会社 | Organic electrolyte and secondary battery comprising the same |
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