CN106848404A - A kind of lithium-ion battery electrolytes functional additive, lithium-ion battery electrolytes and lithium ion battery - Google Patents
A kind of lithium-ion battery electrolytes functional additive, lithium-ion battery electrolytes and lithium ion battery Download PDFInfo
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- 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
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Abstract
The present invention relates to a kind of lithium-ion battery electrolytes functional additive, lithium-ion battery electrolytes and lithium ion battery, belong to technical field of lithium ion.Functional additive of the invention includes the component of following parts by weight：0.5~3 part of vinylene carbonate, 0.1~2 part of difluoro dioxalic acid lithium borate, 0.1~2 part of difluorophosphate, 3~5 parts of fluorobenzene, 0.1~1 part of methane-disulfonic acid methylene ester；Electrolyte of the invention includes lithium salts, organic solvent and functional additive, and mass percent is described functional additive each component in the electrolytic solution：Vinylene carbonate 0.5%~3%, difluoro dioxalic acid lithium borate 0.1%~2%, difluorophosphate 0.1%~2%, fluorobenzene 3%~5%, methane-disulfonic acid methylene ester 0.1%~1%；The invention further relates to the lithium ion battery using the electrolyte, the high temperature cyclic performance of the lithium ion battery is significantly increased.
Description
Technical field
The present invention relates to a kind of lithium-ion battery electrolytes functional additive, lithium-ion battery electrolytes and lithium-ion electric
Pond, belongs to technical field of lithium ion.
Background technology
It is current to be received much concern with the problem of environmental protection on the energy, electric automobile have become the trend of automobile industry development with
One of direction.The need for the strategy of sustainable development, the Chinese government actively promotes research, exploitation and the industry of electric automobile
Change, worked from key components and parts to vehicle application and be in full swing.
Although the technology path of various countries' Development of EV is different, electrokinetic cell as electric automobile crucial portion
Part, is constantly subjected to the attention of researcher for a long time.Lithium ion battery is because its energy density is high, good cycle, safe and reliable
The advantages of property high and strong environmental suitability, that arises at the historic moment becomes electrokinetic cell of new generation, can be widely applied to various shiftings
The fields such as power driven tools, automobile, device drives and energy storage.
As lithium ion battery is in the application in electric automobile field, the thermal adaptability of lithium ion battery is received increasingly
Extensive concern.General up to 38 DEG C or so in China's most area summer environment temperature, circulating battery heating causes battery
Actual temperature is up to 45 DEG C or so in group, has had a strong impact on the cycle life of battery.At present, patent CN103985903A is disclosed
A kind of high-temperature behavior electrolyte of lithium manganate power battery, the non-aqueous organic solvent comprising 75wt%~88wt%, 10wt%~
The lithium salts of 17wt%, the film for additive of 0.5wt%~6wt%, the high temperature additive of 0.5wt%~5wt%, 0.5wt%~
The surfactant of 3wt% and the stabilizer of 0.001wt%~1wt%；Described non-aqueous organic solvent is ethylene carbonate
(EC), one kind in propene carbonate (PC), diethyl carbonate (DEC), dimethyl carbonate (DMC) or methyl ethyl carbonate (EMC)
Or it is several；Lithium salts can be selected from LiPF6The composition of/LiFSI/LIDFOB, film for additive is vinylene carbonate (VC),
High temperature additive is methane-disulfonic acid methylene ester (MMDS), methane-disulfonic acid methylene ester (MMDS) and p-methyl benzenesulfonic acid isocyanates
(PTSI) one or two in combination；Surfactant is fluorine-containing surfactant.The battery is filled at 55 DEG C with 0.5C
After discharge cycles 140 times, specific discharge capacity is 90% or so, it is contemplated that after high current 1C discharge and recharges 500 times, its electric discharge ratio
Capacity is certainly less than 90%, so the electrolyte can not meet high current, the demand of electric discharge is repeated several times.Patent
CN104781976A (applying date 2014.02.20) discloses a kind of non-aqueous electrolytic solution, comprising Non-aqueous Organic Solvents, lithium
Salt and electrolyte solution additive；Described non-aqueous solvent includes linear carbonic ether and cyclic carbonate fat or its combination；Institute
The lithium salts stated includes being selected from LiPF6、LiN(CF3SO2)2、LiN(C2F5SO2)2Deng lithium salts；Electrolyte solution additive is difluoro phosphorus
Sour lithium (LiDFP), vinylene carbonate methyl esters, the composition of sultone are constituted, but it is charged at 55 DEG C with 1C, and 3C discharges 500 times
Capability retention still can not meet requirement after circulation.Patent CN102064344A (applying date 2010.12.21) discloses one kind
Novel electrolyte for power battery, circulation under the conditions of high-temperature lithium ion battery is improved by regulating and controlling the additive in formula system
Performance, and demonstrate addition methane-disulfonic acid methylene ester (MMDS) circulation volume conservation rate can be significantly improved at room temperature,
But without disclosing its circulation volume conservation rate under the high temperature conditions.
The content of the invention
In order to lift performance of the lithium ion battery in hot conditions, first purpose of the invention be provide a kind of lithium from
Sub- battery electrolyte functional additive.
Second object of the present invention is to provide a kind of high-temperature behavior good lithium-ion battery electrolytes, to improve lithium
Ion battery service life at high temperature.
Third object of the present invention is to provide a kind of hot conditions, the lithium ion battery of superior performance.
To achieve these goals, the technical scheme of use of the invention is as follows：
Lithium-ion battery electrolytes functional additive of the invention, including following parts by weight component：Carbonic acid Asia second
0.5~3 part of alkene ester (VC), 0.1~2 part of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 0.1~2 part,
3~5 parts of fluorobenzene (FB), 0.1~1 part of methane-disulfonic acid methylene ester (MMDS).
Lithium-ion battery electrolytes of the invention, including lithium salts, organic solvent, also including functional additive, the function
Additive includes the component of following parts by weight：0.5~3 part of vinylene carbonate, 0.1~2 part of difluoro dioxalic acid lithium borate, two
0.1~2 part of lithium fluophosphate, 3~5 parts of fluorobenzene, 0.1~1 part of methane-disulfonic acid methylene ester.
The each component of functional additive mass percent in the electrolytic solution is：Vinylene carbonate 0.5%~
3%th, difluoro dioxalic acid lithium borate 0.1%~2%, difluorophosphate 0.1%~2%, fluorobenzene 3%~5% and methane-disulfonic acid
Methylene ester 0.1%~1%.
Described lithium salts is lithium hexafluoro phosphate (LiPF6), double (fluorine sulphonyl) imine lithiums (LiFSI), double (trifluoromethyl sulphurs
Acyl) one or more in imine lithium (LiTFSI).
Described lithium salts concentration in the electrolytic solution is 0.5~2mol/L.
Described organic solvent is the mixture of cyclic carbonate fat and chain carbonic ether.
Described chain carbonic ether is diethyl carbonate, methyl ethyl carbonate, dimethyl carbonate.
Described cyclic carbonate fat is ethylene carbonate, propene carbonate.
The mass percent that described organic solvent composition is preferably each component is ethylene carbonate 30%, diethyl carbonate
35%th, methyl ethyl carbonate 15%, dimethyl carbonate 20%.
In difluorophosphate addition organic solvent, durable ESI films can be formed on negative pole, thus difluorophosphate
The decomposition of positive electrode surface that may occur during high temperature circulation can be suppressed, and the oxidation of electrolyte solution can be prevented anti-
Should.Total amount meter based on electrolyte solution, difluorophosphate (LiP (O) F2) content be 0.1~2wt%.Difluorophosphate
Less than in the case of 0.1wt%, the high temperature cyclic performance to lithium ion battery improves not substantially content, and content is higher than 2wt%
In the case of, during lithium ion battery charge and discharge, difluorophosphate possibly cannot be consumed completely when ESI films are formed, and be filled
Decompose, unreacted excessive difluorophosphate may in the electrolytic solution form sediment, reduce the impedance of lithium ion battery
Characteristic, and influence the cycle performance and service life of lithium ion battery.
Vinylene carbonate base ester can act synergistically together with difluorophosphate in the electrolytic solution, form the SEI films of stabilization.Carbon
The content of sour ethenylidene ester is preferably 0.5~3wt%, in the case where vinylene carbonate ester content is less than 0.5wt%, carbonic acid
Ethenylidene ester can not be acted on fully with difluorophosphate, can not form expected SEI films, be higher than in vinylene carbonate base ester content
During 3wt%, there is side reaction between vinylene carbonate base ester and positive active material, while the SEI films for being formed also can be blocked up, lead
Causing impedance increases, and influences high-temperature lithium ion battery cycle performance.
Methane-disulfonic acid methylene ester, three kinds of materials of fluorobenzene and vinylene carbonate can act synergistically, and promote lithium ion battery
Battery forms the SEI films of dense uniform, and the SEI films for being formed are special in structure, are not easy to decompose and destroy at relatively high temperatures,
Ensure that lithium ion battery has preferable performance under the high temperature conditions.
Third object of the present invention is to provide a kind of lithium ion battery being made using above-mentioned electrolyte, meets industry
Production and life use the demand of lithium ion battery under the high temperature conditions.
The preparation method of lithium ion battery is as follows in the present invention：
The first step：Positive plate, barrier film and negative plate are made battery core, and battery core is loaded in battery container, inject this hair
Lithium-ion battery electrolytes in bright, chemical conversion；
Second step：After the lithium ion battery that the first step is obtained completely is filled, high temperature is carried out at a temperature of being placed in 40 DEG C~85 DEG C
Burin-in process；
3rd step：Battery pumping in second step, sealing, constant volume are obtained into final lithium ion battery.
Positive active material used is LiCoO on the positive plate of described lithium ion battery2、LiFePO4、LiMn2O4、
LiMn1-yMyPO4、LiMn1-yMyO4And LiNixCoyMnzM1-x-y-zO2In any one or a few；Wherein, M is independently each
Any one in Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V, Ti, and 0≤y≤1,0≤x≤1,0≤z
≤ 1, x+y+z≤1.
Negative electrode active material on the negative plate used of described lithium ion battery is Delanium, native graphite, soft
Any one in carbon, Si/C negative materials or combination.
Barrier film used by described lithium ion battery is polyethylene film (PE), polypropylene screen (PP), polypropylene, polyethylene/
One kind of polypropylene composite film (PP/PE/PP).
The material of housing used by described lithium ion battery is in aluminum plastic film, fiber glass reinforced polypropylene (PP), stainless steel, aluminium
One kind.
Used as the lithium ion battery in the present invention, battery core production method is the one kind in winding, lamination.
The aging temperature of high temperature of the present invention and both parameters of high temperature ageing time have certain relation.During high temperature ageing
Between reduced with the rising of high temperature ageing temperature：When 40 DEG C~50 DEG C of high temperature ageing temperature, the high temperature ageing time is 3~7 days；
During high temperature ageing temperature 50 C~60 DEG C, the high temperature ageing time is 1~3 day；During high temperature ageing temperature 60 C~85 DEG C, high temperature is old
The change time is 8h~1 day.
Compared with prior art, the characteristic of electrolyte of the invention is to take full advantage of vinylene carbonate, fluorobenzene, first
The synergy of alkane disulfonic acid methylene ester three, forms the good additive of high-temperature behavior, improves the high-temperature behavior of battery.Electricity
Difluorophosphate, two kinds of compositions containing lithium of difluoro dioxalic acid lithium borate, two kinds of compositions containing lithium is added to act on chemical conversion with lithium salts in pond
Stage forms SEI films in graphite cathode surface has good heat endurance, while also having relatively low impedance, therefore improves
Lithium ion battery cycle performance under the high temperature conditions.
By adding above-mentioned electrolyte in lithium ion battery, the lithium battery of preparation has good property under the conditions of height
Can, the needs living needs of operation or industrial needs under the high temperature conditions are disclosure satisfy that, and its cycle performance is good, can apply
Longer time ensure that safety without changing battery, and cost has been saved again.
The improved-type functional additive of high temperature of the invention has good in the chemical conversion stage in the SEI films that graphite cathode surface is formed
Good heat endurance has relatively low impedance simultaneously, therefore does not reduce the low of battery while battery high-temperature cycle performance is lifted
Warm discharge performance；Using full electric high temperature ageing technique, the SEI films that battery is formed in the chemical conversion stage carry out reconstruction, film it is molten
Solution makes new film have porous structure with redeposited, so that electrolyte is further contacted with electrode and continues reduction, makes
The SEI films for ultimately forming are finer and close, stable, reach the purpose for improving battery high-temperature cycle performance.
Specific embodiment
Embodiment 1
The ion battery electrolyte functional additive of the present embodiment is made up of the component of following parts by weight：Carbonic acid Asia second
2 parts of alkene ester (VC), 0.3 part of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 0.5 part, fluorobenzene (FB) 3
Part, 0.2 part of methane-disulfonic acid methylene ester (MMDS).
The present embodiment intermediate ion battery electrolyte includes lithium salts, organic solvent, functional additive, more specifically for lithium salts is
Lithium hexafluoro phosphate (LiPF6), lithium hexafluoro phosphate concentration in the electrolytic solution is 1.2mol/L, the organic solvent used by the present embodiment
It is cyclic carbonate fat and the mixture of chain carbonic ether, wherein cyclic carbonate fat is ethylene carbonate, and mass percent is 30%,
Chain carbonic ether be diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate, mass percent be respectively diethyl carbonate 35%,
Methyl ethyl carbonate 15%, dimethyl carbonate 20%；Contained functional additive each component accounts for the mass percent of whole electrolyte
Respectively vinylene carbonate (VC) 2%, difluoro dioxalic acid lithium borate (LiODFB) 0.3%, difluorophosphate (LiPOF2)
0.5%th, fluorobenzene (FB) 3%, methane-disulfonic acid methylene ester (MMDS) 0.2%.
In the present embodiment prepared by lithium ion battery to include the preparation of positive plate, the preparation of negative plate, and lithium ion battery
Preparation.Detailed process is as follows：
The preparation of positive plate：
By iron phosphate serving as positive active material (LiFePO4), conductive agent Super-P (SP), bonding agent PVDF is according to quality
Ratio 92: 4: 4 is added in nmp solvent the prepared anode sizing agent that is uniformly dispersed.Anode sizing agent is coated on Al paper tinsels, roller is carried out
Pressure, section and baking operation, are obtained positive plate.
The preparation of negative plate：
By negative electrode active material Delanium, conductive agent SP, bonding agent SBR emulsion (SBR) and thickening agent carboxymethyl
Sodium cellulosate (CMC) is starched according to the prepared negative pole that is uniformly dispersed in the addition solvent deionized water of mass ratio 95: 1.0: 2.5: 1.5
Material.Cathode size is coated on Cu paper tinsels, the operations such as roll-in, section and drying are carried out, negative plate is obtained.
It is the double-deck microporous barrier of 32 μm of polypropylene (PP) that barrier film uses thickness.
The preparation of lithium ion battery：
Above-mentioned positive plate, negative plate and barrier film are fabricated to battery core according to Z-shaped lamination process, battery core is loaded into aluminum plastic film
In packaging bag, and vacuum bakeout is carried out, irrigate above-mentioned lithium-ion battery electrolytes, Vacuum Package, chemical conversion are then carried out to battery core.
Following high temperature ageing treatment is carried out to above-mentioned lithium ion battery：Battery core is completely charged to the rate of charge of 0.3C
3.65V, then stands 5 days in 45 DEG C of baking oven, and battery core is placed cooling a period of time at normal temperatures by standing after terminating, and is allowed to
Return to room temperature.
Final lithium ion battery is obtained to the battery pumping after high temperature ageing, sealing, constant volume.
Embodiment 2
The present embodiment intermediate ion battery electrolyte functional additive is made up of the component of following parts by weight：Carbonic acid Asia second
1 part of alkene ester (VC), 1 part of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 0.5 part, fluorobenzene (FB) 3.5
Part, 0.2 part of methane-disulfonic acid methylene ester (MMDS).
The present embodiment intermediate ion battery electrolyte includes lithium salts, organic solvent, functional additive, is more specifically this implementation
Lithium salts is lithium hexafluoro phosphate (LiPF in example6) and double (fluorine sulphonyl) imine lithium (LiFSI), lithium hexafluoro phosphate in the electrolytic solution dense
It is 0.6mol/L to spend, and double (fluorine sulphonyl) imine lithium concentration in the electrolytic solution are 0.4mol/L, organic molten used by the present embodiment
Agent is the mixture of cyclic carbonate fat and chain carbonic ether, and wherein cyclic carbonate fat is ethylene carbonate, and mass percent is
30%, chain carbonic ether is diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate, and mass percent is respectively diethyl carbonate
35%th, methyl ethyl carbonate 15%, dimethyl carbonate 20%；Contained functional additive each component accounts for the quality hundred of whole electrolyte
Divide than respectively vinylene carbonate (VC) 1%, difluoro dioxalic acid lithium borate (LiODFB) 1%, difluorophosphate (LiPOF2)
0.5%th, fluorobenzene (FB) 3.5%, methane-disulfonic acid methylene ester (MMDS) 0.2%.
Positive plate used, negative plate and barrier film and implementation in the preparation method of the high temperature lithium ion battery in the present embodiment
Example 1 is identical, only difference is that battery high-temperature aging condition stands 2 days for 60 DEG C.
Embodiment 3
The present embodiment intermediate ion battery electrolyte functional additive is made up of the component of following parts by weight：Carbonic acid Asia second
1.5 parts of alkene ester (VC), 1 part of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 0.2 part, fluorobenzene (FB) 3.5
Part, 0.2 part of methane-disulfonic acid methylene ester (MMDS).
The present embodiment intermediate ion battery electrolyte includes lithium salts, organic solvent, functional additive, is more specifically this implementation
Lithium salts is lithium hexafluoro phosphate (LiPF in example6) and double (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI), lithium hexafluoro phosphate is in electrolysis
Concentration in liquid is 0.6mol/L, and double (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI) concentration in the electrolytic solution is 0.4mol/
L, the organic solvent used by the present embodiment is cyclic carbonate fat and the mixture of chain carbonic ether, and wherein cyclic carbonate fat is carbonic acid
Vinyl acetate, mass percent is 30%, and chain carbonic ether is diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate, quality hundred
Divide than respectively diethyl carbonate 35%, methyl ethyl carbonate 15%, dimethyl carbonate 20%；Contained functional additive each component
Account for mass percent respectively vinylene carbonate (VC) 1.5%, the difluoro dioxalic acid lithium borate (LiODFB) of whole electrolyte
1%th, difluorophosphate (LiPOF2) 0.2%, fluorobenzene (FB) 3.5%, methane-disulfonic acid methylene ester (MMDS) 0.2%.
Positive plate used, negative plate and barrier film and implementation in the preparation method of the high temperature lithium ion battery in the present embodiment
Example 1 is identical, only difference is that battery high-temperature aging condition is 85 DEG C of standing 12h.
Embodiment 4
The present embodiment intermediate ion battery electrolyte functional additive is made up of the component of following parts by weight：Carbonic acid Asia second
2 parts of alkene ester (VC), 0.5 part of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 1.0 parts, fluorobenzene (FB) 5
Part, 0.5 part of methane-disulfonic acid methylene ester (MMDS).
The present embodiment intermediate ion battery electrolyte includes lithium salts, organic solvent, functional additive, is more specifically this implementation
Lithium salts is lithium hexafluoro phosphate (LiPF in example6) and double (fluorine sulphonyl) imine lithium (LiFSI), lithium hexafluoro phosphate in the electrolytic solution dense
It is 1.0mol/L to spend, and double (fluorine sulphonyl) imine lithium (LiFSI) concentration in the electrolytic solution is 0.2mol/L, used by the present embodiment
Organic solvent is the mixture of cyclic carbonate fat and chain carbonic ether, and wherein cyclic carbonate fat is ethylene carbonate, quality percentage
Than being 30%, chain carbonic ether is diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate, and mass percent is respectively carbonic acid two
Ethyl ester 35%, methyl ethyl carbonate 15%, dimethyl carbonate 20%；Contained functional additive each component accounts for the matter of whole electrolyte
Amount percentage is respectively vinylene carbonate (VC) 2%, difluoro dioxalic acid lithium borate (LiODFB) 0.5%, difluorophosphate
(LiPOF2) 1.0%, fluorobenzene (FB) 5%, methane-disulfonic acid methylene ester (MMDS) 0.5%.
Positive plate used, negative plate and barrier film and implementation in the preparation method of the high temperature lithium ion battery in the present embodiment
Example 1 is identical, and the preparation method of lithium ion battery only difference is that battery high-temperature aging technique is 85 DEG C with embodiment 1
Stand 12h.
Embodiment 5
The present embodiment intermediate ion battery electrolyte functional additive is made up of the component of following parts by weight：Carbonic acid Asia second
1.5 parts of alkene ester (VC), 1.5 parts of difluoro dioxalic acid lithium borate (LiODFB), difluorophosphate (LiPOF2) 0.2 part, fluorobenzene (FB) 5
Part, 0.5 part of methane-disulfonic acid methylene ester (MMDS).
The present embodiment intermediate ion battery electrolyte includes lithium salts, organic solvent, functional additive, is more specifically this implementation
Lithium salts is lithium hexafluoro phosphate (LiPF in example6) and double (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI), lithium hexafluoro phosphate is in electrolysis
Concentration in liquid is 0.6mol/L, and double (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI) concentration in the electrolytic solution is 0.4mol/
L, the organic solvent used by the present embodiment is cyclic carbonate fat and the mixture of chain carbonic ether, and wherein cyclic carbonate fat is carbonic acid
Vinyl acetate, mass percent is 30%, and chain carbonic ether is diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate, quality hundred
Divide than respectively diethyl carbonate 35%, methyl ethyl carbonate 15%, dimethyl carbonate 20%；Contained functional additive each component
Account for mass percent respectively vinylene carbonate (VC) 1.5%, the difluoro dioxalic acid lithium borate (LiODFB) of whole electrolyte
1.5%th, difluorophosphate (LiPOF2) 0.2%, fluorobenzene (FB) 3.5%, methane-disulfonic acid methylene ester (MMDS) 0.2%.
Positive plate used, negative plate and barrier film and implementation in the preparation method of the high temperature lithium ion battery in the present embodiment
Example 1 is identical, only difference is that battery high-temperature aging technique stands 5 days for 45 DEG C.
Lithium ion battery to finally giving carries out high-temperature behavior test.
Comparative example
This comparative example does not contain difluoro dioxalic acid lithium borate with being different only in that in lithium salts contained by electrolyte for embodiment 1
(LiODFB), difluorophosphate (LiPOF2), fluorobenzene (FB), methane-disulfonic acid methylene ester (MMDS), and obtained lithium-ion electric
High temperature ageing treatment is not done in pond.Other are same as Example 1.
Experimental example
Lithium ion battery prepared by the lithium ion battery and comparative example that will be prepared in embodiment 1~5 enters under the conditions of 60 DEG C
Row 1C/1C cycle performances are tested, and 1C multiplying powers charge to 3.65V, and 1C multiplying power dischargings to 2.5V after circulating 500 times, determine capacity and protect
Holdup.
The high temperature cyclic performance test result of table 1
| Embodiment | Cycle-index | Capability retention |
| Comparative example | 500 | 85.6% |
| Embodiment 1 | 500 | 92.60% |
| Embodiment 2 | 500 | 94.1% |
| Embodiment 3 | 500 | 93.8% |
| Embodiment 4 | 500 | 92.1% |
| Embodiment 5 | 500 | 94.7% |
Embodiment is circulated 500 times with comparative example under the conditions of 60 DEG C, and capability retention as shown in table 1, is added of the invention
The lithium ion battery of functional additive, its capability retention is compared than being added without the lithium ion battery of the functional additive, capacity
Holding is significantly improved, and its capability retention is 92.1~94.7%, and the result is fully proved using lithium ion battery of the invention
The lithium ion battery of electrolyte functional additive and electrolyte has good high temperature cyclic performance.
Claims (9)
1. a kind of lithium-ion battery electrolytes functional additive, it is characterised in that the component including following parts by weight：Carbonic acid
0.5~3 part of vinylene, 0.1~2 part of difluoro dioxalic acid lithium borate, 0.1~2 part of difluorophosphate, 3~5 parts of fluorobenzene, methane
0.1~1 part of disulfonic acid methylene ester.
2. a kind of lithium-ion battery electrolytes, including lithium salts, organic solvent, it is characterised in that：Also include functional additive, it is described
Functional additive includes the component of following parts by weight：0.5~3 part of vinylene carbonate, difluoro dioxalic acid lithium borate 0.1~2
Part, 0.1~2 part of difluorophosphate, 3~5 parts of fluorobenzene, 0.1~1 part of methane-disulfonic acid methylene ester.
3. lithium-ion battery electrolytes according to claim 2, it is characterised in that：The each component of the functional additive exists
Mass percent in electrolyte is：Vinylene carbonate 0.5%~3%, difluoro dioxalic acid lithium borate 0.1%~2%, difluoro
Lithium phosphate 0.1%~2%, fluorobenzene 3%~5% and methane-disulfonic acid methylene ester 0.1%~1%.
4. lithium-ion battery electrolytes according to claim 2, it is characterised in that：The lithium salt is 0.5~2mol/
L。
5. lithium-ion battery electrolytes according to claim 4, it is characterised in that：The lithium salts is lithium hexafluoro phosphate, double
One or more in (fluorine sulphonyl) imine lithium, double (trimethyl fluoride sulfonyl) imine lithiums.
6. lithium-ion battery electrolytes according to claim 2, it is characterised in that：Described organic solvent is cyclic carbonate
The mixture of fat and chain carbonic ether.
7. lithium-ion battery electrolytes according to claim 6, it is characterised in that：The chain carbonic ether includes carbonic acid two
Ethyl ester, methyl ethyl carbonate, dimethyl carbonate.
8. the lithium ion battery that electrolyte any one of a kind of use claim 2~7 is made.
9. lithium ion battery according to claim 8, it is characterised in that the preparation method of the lithium ion battery includes old
Change is processed, and the aging temperature of described burin-in process is 40 DEG C~50 DEG C, ageing time is 3~7 days or aging temperature is 50
DEG C~60 DEG C, ageing time be 1~3 day or aging temperature be 60 DEG C~85 DEG C, ageing time be 8h~24h.
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