CN107180998B - A kind of electrolyte and lithium ion battery - Google Patents
A kind of electrolyte and lithium ion battery Download PDFInfo
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- CN107180998B CN107180998B CN201710457781.0A CN201710457781A CN107180998B CN 107180998 B CN107180998 B CN 107180998B CN 201710457781 A CN201710457781 A CN 201710457781A CN 107180998 B CN107180998 B CN 107180998B
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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
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
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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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- 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
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Abstract
The present invention provides a kind of electrolyte, inorganic lithium salt, 3~15wt% including 0.5~4mol/L silane-modified inorganic filler and solvent；Silane used in the silane-modified inorganic filler is YSiX3, wherein Y is selected from alkyl, oxoalkyl group, amino or phenyl；X is selected from alkyl or alkoxy；Inorganic filler used in the silane-modified inorganic filler is selected from one or more of silicate, carbonate, carbide, sulfate, sulfide, titanate, oxide, hydroxide and metal inorganic filler.Electrolyte in the present invention is a kind of semisolid, quasi-solid electrolyte, the present invention adds silane-modified aluminum oxide and increases liquid electrolyte viscosity, reduces solution mobility, liquid solution is avoided easily to reveal hidden danger, and improve battery security, and be able to bear higher voltage.The present invention also provides a kind of lithium ion batteries.
Description
Technical field
The invention belongs to technical field of lithium ion more particularly to a kind of electrolyte and lithium ion battery.
Background technique
Lithium ion battery is the current best chargeable chemical cell of technical performance in the world, has operating voltage height, ratio
Energy is big, have extended cycle life, self discharge is small, memory-less effect, it is pollution-free the advantages that, be widely used in mobile communication, notebook
The fields such as computer, portable dam, electric bicycle.
In the case where people increasingly focus on environmental protection, lithium ion battery is the main of new energy development as energy storage device
Direction, if the Chinese patent of Publication No. CN106684448A discloses a kind of preparation method of high-temperature-reslithium lithium battery electrolyte,
Electrolyte service life is longer in the patent, and thermal stability is preferable, but still remains liquid electrolyte easy-to-leak liquid, inflammable,
Explosive safety issue.
So sight has been invested solid electrolyte by people, but all solid state electrolyte conductivity is low, at room temperature electrochemistry
Performance difference etc., therefore, it is necessary to research and develop a kind of electrolyte that highly-safe and practicability is good.
Summary of the invention
The purpose of the present invention is to provide a kind of electrolyte and lithium ion battery, the electrolyte in the present invention is highly-safe,
And excellent electrochemical performance, practicability are good.
The present invention provides a kind of electrolyte, the silane-modified nothing of inorganic lithium salt, 3~15wt% including 0.5~4mol/L
Machine filler and solvent；
Silane used in the silane-modified inorganic filler is YSiX3, wherein Y is selected from alkyl, oxoalkyl group, ammonia
Base or phenyl；X is selected from alkyl or alkoxy；
Inorganic filler used in the silane-modified inorganic filler is selected from silicate, carbonate, carbide, sulfuric acid
One or more of salt, sulfide, titanate, oxide, hydroxide and metal inorganic filler.
Preferably, silane used in the silane-modified inorganic filler be selected from 3-aminopropyltriethoxysilane,
N-2 (aminoethyl) 3- aminopropyl trimethoxysilane, gamma-aminopropyl-triethoxy-silane, enhanced amino silane, metering system
Acryloxypropylethoxysilane trimethoxy silane, methacryloxypropylmethyl dimethoxysilane, dodecyl triethoxysilicane
One or more of alkane, N- ruthenium triethoxysilane, methyltrimethoxysilane and octyltri-ethoxysilane.
Preferably, the oxide is in aluminum oxide, zirconium dioxide, silica, zinc oxide and titanium dioxide
One or more.
Preferably, the concentration of the inorganic lithium salt is 1~4mol/L.
Preferably, the inorganic lithium salt include lithium hexafluoro phosphate, it is LiBF4, lithium perchlorate, trifluoromethanesulfonic acid lithium, double
Trifluoromethanesulfonimide lithium, double fluorine sulfimide lithiums, four cyanogen lithium borates, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium and two
One or more of fluorine dimalonic acid lithium borate.
Preferably, the mass concentration of the silane-modified inorganic filler is 5~10wt%.
Preferably, the solvent includes ethylene carbonate, dimethyl carbonate, dimethyl ether, fluorinated ethylene carbonate, carbonic acid first
One or more of ethyl ester, propene carbonate and diethyl carbonate.
The present invention provides a kind of lithium ion battery, including electrolyte described above.
The present invention provides a kind of electrolyte, and inorganic lithium salt, solvent and 3~15wt% silane including 0.5~4mol/L change
The inorganic filler of property；If it is less than 3% inorganic filler, needle thorn and certainly flame-out test result are undesirable in security performance, are greater than
15% inorganic filler is difficult to incorporate basic electrolyte, and battery impedance is caused to increase, and chemical property is poor.It is described silane-modified
Silane used in inorganic filler is YSiX3, wherein Y is selected from alkyl, oxoalkyl group, amino or phenyl；X is selected from alkyl or alkane
Oxygroup；Inorganic filler used in the silane-modified inorganic filler is selected from silicate, carbonate, carbide, sulfate, sulphur
One or more of compound, titanate, oxide, hydroxide and metal inorganic filler.Electrolyte in the present invention is one
Kind semisolid, quasi-solid electrolyte, the present invention add silane-modified aluminum oxide and increase liquid electrolyte viscosity, reduce
Solution mobility avoids liquid solution from easily revealing hidden danger, and improves battery security, and be able to bear higher voltage.Phase
It for basic electrolyte, adds silane-modified inorganic filler electrochemical window and does not change, the nickel ion doped at five volts is added
Anode is done, the button cell cycle performance high rate performance that lithium piece does cathode is good.The experimental results showed that in high-voltage battery,
In the case where not influencing chemical property, security performance is improved, and does anode in Soft Roll ternary material, graphite makees the battery of cathode
In, in the case that capacity is kept, acupuncture effect is obvious, and security performance significantly improves.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the state diagram of electrolyte in the embodiment of the present invention 1 and comparative example 1；
Fig. 2 is the state before and after soft-package battery pin prick test of the present invention；
Fig. 3 is the cyclic curve before soft-package battery pin prick test of the present invention in 0.1C；
Voltage change curve when Fig. 4 is soft-package battery pin prick test made of 1 electrolyte of comparative example of the present invention；
Voltage change curve when Fig. 5 is soft-package battery pin prick test made of 2 electrolyte of the embodiment of the present invention；
Temperature variation curve when Fig. 6 is soft-package battery pin prick test made of 1 electrolyte of comparative example of the present invention；
Temperature variation curve when Fig. 7 is soft-package battery pin prick test made of 2 electrolyte of the embodiment of the present invention.
Specific embodiment
The present invention provides a kind of electrolyte, the silane-modified nothing of inorganic lithium salt, 3~15wt% including 0.5~4mol/L
Machine filler and solvent；
Silane used in the silane-modified inorganic filler is YSiX3, wherein Y is selected from alkyl, oxoalkyl group, ammonia
Base or phenyl；X is selected from alkyl or alkoxy；
Inorganic filler used in the silane-modified inorganic filler is selected from silicate, carbonate, carbide, sulfuric acid
One or more of salt, sulfide, titanate, oxide, hydroxide and metal inorganic filler.
Electrolyte in the present invention is highly-safe, and excellent electrochemical performance.
In the present invention, the inorganic lithium salt preferably includes lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), it is high
Lithium chlorate (LiClO4), trifluoromethanesulfonic acid lithium (LiCF3SO3), double trifluoromethanesulfonimide lithiums (LiTFSI), double fluorine sulphonyl it is sub-
Amine lithium (LiFSI), four cyanogen lithium borates (LiB (CN)4), di-oxalate lithium borate (LiBOB), difluorine oxalic acid boracic acid lithium (LiDFOB) and
One or more of difluoro dimalonic acid lithium borate (LiBFMB), it is preferred to use lithium hexafluoro phosphate；The inorganic lithium salt is in electricity
The molar concentration of Xie Zhizhong is 0.5~4mol/L, preferably 1~3mol/L, more preferably 1~2mol/L.
In the present invention, the mass fraction of the silane-modified inorganic filler in the electrolyte is 3~15%, preferably
5~10%, more preferably 7~8%.In the present invention, silane used in the silane-modified inorganic filler is YSiX3,
Wherein, Y is selected from alkyl, oxoalkyl group, amino or phenyl；X is selected from alkyl or alkoxy, is preferably selected from three ethoxy of 3- aminopropyl
Base silane (KH-550), N-2 (aminoethyl) 3- aminopropyl trimethoxysilane (KH-792), gamma-aminopropyl-triethoxy-silane,
Enhanced amino silane (KH-2170), methacryloxypropyl trimethoxy silane, methacryloyloxypropyl methyl
Dimethoxysilane, dodecyl triethoxysilane (XH-10), N- ruthenium triethoxysilane, methyltrimethoxysilane
One or more of with octyltri-ethoxysilane；Inorganic filler used in the silane-modified inorganic filler is selected from silicon
One of hydrochlorate, carbonate, carbide, sulfate, sulfide, titanate, oxide, hydroxide and metal inorganic filler
Or it is several, wherein the oxide in aluminum oxide, zirconium dioxide, silica, zinc oxide and titanium dioxide one
Kind is several.
Present invention preferably employs the high temperature alumina through the silane-modified mistake of octyl, three silane-modified oxidations two of the octyl
The specific surface area of aluminium is 85~115m2/g；PH value (the 4% dispersion concentration condition of the silane-modified aluminum oxide of the octyl
Under) it is preferably 3.0~5.0, more preferably 4.0；The loss on drying of the silane-modified aluminum oxide of the octyl is (2 at 105 DEG C
Hour)≤2%；The carbon content of the silane-modified aluminum oxide of the octyl is preferably 3.0~4.5wt%, and more preferably 3.5
~4.0wt%；The tap density of the silane-modified aluminum oxide of the octyl is preferably 45~55g/L, more preferably 50g/
L；In the silane-modified aluminum oxide of the octyl aluminum oxide mass fraction preferably >=95%；The octyl silane changes
150 DEG C of thermal decomposition temperature > of the aluminum oxide of property.Specifically, in an embodiment of the present invention, can be used and win wound industry collection
The silane-modified aluminum oxide of 805 model of AEROXIDE Alu C of group (Evonik).In actual production,
805 product of AEROXIDE Alu C is usually utilized to improve the mobility of powdery paints or toner, or is used in plastic products
Middle prevention adherency and agglomeration, the present invention are used in electrolyte, reduce the mobility of liquid electrolyte, are improving lithium electricity
Excellent chemical property is also assured while the safety of pond.
In the present invention, the solvent preferably includes ethylene carbonate (EC), dimethyl carbonate (DMC), dimethyl ether
(DME), in fluorinated ethylene carbonate (FEC), methyl ethyl carbonate (EMC), PC (propene carbonate) and DEC (diethyl carbonate)
It is one or more of.One such solvent can be used in the present invention, and may also be used in which two kind solvent is with the proportion of 1:1 or 3:7
Mixing, such as ethylene carbonate: dimethyl carbonate be 3:7 (volume ratio) mixed solvent, the three kinds of solvents that may also be used in which with
The proportion of 1:1:1 mixes.
Above-mentioned electrolyte is preferably prepared according to the following steps in the present invention:
Inorganic lithium salt is added in the solvent for removing water, then the silane-modified inorganic filler after drying is added, quiet
It sets 1~3 hour, obtains electrolyte；
The concentration of the inorganic lithium salt in the electrolyte is 0.5~4mol/L；
The mass fraction of the silane-modified inorganic filler in the electrolyte is 3~15%；
In the present invention, the type of each raw material, source and dosage and the above type of each raw material, source and dosage one
It causes, details are not described herein.
Present invention preferably employs dry molecular sieves to remove water to solvent, is then allowed to stand 24 hours or so, was removed
The solvent of water；The drying temperature of the silane-modified aluminum oxide is preferably 110~140 DEG C, more preferably 120~130
℃；The time of the drying is preferably 12 hours or more.The inorganic lithium salt is preferably gradually added by the present invention on a small quantity several times.
The present invention also provides a kind of lithium ion battery, the lithium ion battery includes electrolyte above, the present invention
There is no special limitation to the type of the lithium ion battery, can be solid state battery, such as cobalt acid lithium, LiMn2O4, LiFePO4
It is single or multiple compound as anode with ternary material and rich lithium material, with carbon negative pole material, tin base cathode material, transition gold
Belong to oxide cathode material or nanometer oxide material etc. and is used as negative electrode material；Also it can be made soft-package battery.
The present invention provides a kind of electrolyte, the silane-modified nothing of inorganic lithium salt, 3~15wt% including 0.5~4mol/L
Machine filler and solvent；Silane used in the silane-modified inorganic filler is YSiX3, wherein Y is selected from alkyl, oxolanyl alkane
Base, amino or phenyl；X is selected from alkyl or alkoxy；Inorganic filler used in the silane-modified inorganic filler is selected from silicon
One of hydrochlorate, carbonate, carbide, sulfate, sulfide, titanate, oxide, hydroxide and metal inorganic filler
Or it is several.Electrolyte in the present invention is a kind of semisolid, quasi-solid electrolyte, and the present invention adds three silane-modified oxidations two
Aluminium increases liquid electrolyte viscosity, reduces solution mobility, avoids liquid solution from easily revealing hidden danger, and improve cell safety
Property, and it is able to bear higher voltage.The experimental results showed that in high-voltage battery, the case where not influencing chemical property
Under, security performance improves, and does anode in Soft Roll ternary material, and graphite is done in the battery of cathode, in the case that capacity is kept, needle thorn
Effect is obvious, and security performance significantly improves.
In order to further illustrate the present invention, with reference to embodiments to a kind of electrolyte provided by the invention and its preparation side
Method is described in detail, but cannot be understood as limiting the scope of the present invention.
In the examples below, silane-modified aluminum oxide, which is all made of, wins wound industrial group (Evonik)
805 product of AEROXIDE Alu C.
Embodiment 1
Ethylene carbonate (EC) and dimethyl carbonate (DMC) are removed water with dried molecular sieve respectively first, it is small to stand 24
When or so it is spare；
Silane-modified aluminum oxide is dried 12 hours at 130 DEG C or more, it is spare；
Organic solvent is weighed with volume ratio EC:DMC=3:7, lithium hexafluoro phosphate is added, is uniformly mixed, makes lithium hexafluoro phosphate
Concentration is 1mol/L；Then above-mentioned dried silane-modified aluminum oxide is added, makes its content 3wt%, obtains electricity
Xie Zhi is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 26.94s g-1。
Embodiment 2
Electrolyte is prepared according to the method for embodiment 1, unlike, the content of silane-modified aluminum oxide is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 17.36s g-1。
Embodiment 3
Electrolyte is prepared according to the method for embodiment 1, unlike, the content of silane-modified aluminum oxide is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 10.87s g-1.
Embodiment 4
Electrolyte is prepared according to the method for embodiment 1, unlike, the concentration of lithium hexafluoro phosphate is 0.5mol/L, is passed through
Self-extinguishing time experiment test, the burning time of electrolyte are 28.92s g-1。
Embodiment 5
Electrolyte is prepared according to the method for embodiment 5, unlike, the content of silane-modified aluminum oxide is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 19.28s g-1。
Embodiment 6
Electrolyte is prepared according to the method for embodiment 5, unlike, the content of silane-modified aluminum oxide is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 12.44s g-1。
Embodiment 7
Electrolyte is prepared according to the method for embodiment 1, unlike, silane-modified aluminum oxide lithium hexafluoro phosphate
Concentration is 4mol/L, tests and tests by self-extinguishing time, and the burning time of electrolyte is 17.48s g-1。
Embodiment 8
Electrolyte is prepared according to the method for embodiment 7, unlike, the content of silane-modified aluminum oxide is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 14.55s g-1。
Embodiment 9
Electrolyte is prepared according to the method for embodiment 7, unlike, the content of silane-modified aluminum oxide is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 9.57s g-1。
Embodiment 10
Ethylene carbonate (EC) and dimethyl carbonate (DMC) are removed water with dried molecular sieve respectively first, it is small to stand 24
When or so it is spare；
Silane-modified silica is dried 12 hours at 130 DEG C or more, it is spare；
Organic solvent is weighed with volume ratio EC:DMC=3:7, lithium hexafluoro phosphate is added, is uniformly mixed, makes lithium hexafluoro phosphate
Concentration is 1mol/L；Then above-mentioned dried silane-modified silica is added, makes its content 3wt%, is electrolysed
Matter, silane-modified silica can be dissolved into electrolyte, and by self-extinguishing time experiment test, the burning time of electrolyte is
17.11s g-1。
Embodiment 11
Electrolyte is prepared according to the method for embodiment 10, unlike, the content of silane-modified silica is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 15.28s g-1。
Embodiment 12
Electrolyte is prepared according to the method for embodiment 10, unlike, the content of silane-modified silica is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 15.55s g-1.
Embodiment 13
Electrolyte is prepared according to the method for embodiment 10, unlike, the concentration of lithium hexafluoro phosphate is 0.5mol/L, is passed through
Self-extinguishing time experiment test, the burning time of electrolyte are 25.32s g-1。
Embodiment 14
Electrolyte is prepared according to the method for embodiment 13, unlike, the content of silane-modified silica is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 23.23s g-1。
Embodiment 15
Electrolyte is prepared according to the method for embodiment 13, unlike, the content of silane-modified silica is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 20.52s g-1。
Embodiment 16
Electrolyte is prepared according to the method for embodiment 10, unlike, the concentration of lithium hexafluoro phosphate is 4mol/L, by certainly
Time experiment test is put out, the burning time of electrolyte is 11.18s g-1。
Embodiment 17
Electrolyte is prepared according to the method for embodiment 16, unlike, the content of silane-modified silica is
10wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 10.91s g-1。
Embodiment 18
Electrolyte is prepared according to the method for embodiment 16, unlike, the content of silane-modified silica is
15wt% is tested by self-extinguishing time and is tested, and the burning time of electrolyte is 10.65s g-1。
Comparative example 1
Electrolyte is prepared according to the method for embodiment 1, unlike, it is not added in the electrolyte of this comparative example silane-modified
Aluminum oxide.
Referring to Fig. 1, Fig. 1 is the state diagram of electrolyte in the embodiment of the present invention 1 and comparative example 1, and a) figure is two kinds of electrolyte
Just place state, b) figure be two kinds of electrolyte upside downs state.As seen from Figure 1, the electrolyte in comparative example 1
For flowable liquid electrolyte, the electrolyte in embodiment 1 is not flowable solid electrolyte.
The present invention is also tested the burning time of these three electrolyte, the electrolyte burning time in comparative example 1
For 84.12sg-1, the burning time of electrolyte is 17.36sg in embodiment 1-1.Burning time is shorter, illustrates the safety of battery
It can be higher.
The pin prick test of soft-package battery
Electrolyte in embodiment 2 and comparative example 1 is used in soft-package battery by the present invention, does anode with 10 layers of NCM622,
Graphite does cathode, does needle thorn experiment, and effect is obvious.Here close with quality, the identical positive plate of the number of plies, negative electrode tab, strictly
The soft-package battery made according to industrial requirements.For raw material specification referring to table 1, table 1 is soft-package battery raw material proportioning of the present invention.It is manufactured
Soft-package battery parameter such as table 2, table 2 are the specifications parameter of soft-package battery of the present invention.
The soft-package battery raw material proportioning of the present invention of table 1
The specifications parameter of the soft-package battery of the present invention of table 2
The present invention is according to GB/T 31485-2015 power accumulator safety requirements for electric vehicle and test method to above-mentioned
Two kinds of soft-package batteries have carried out pin prick test, as a result as shown in Fig. 2~7, wherein Fig. 2 is soft-package battery pin prick test of the present invention
The state of front and back, as seen from Figure 2, soft-package battery made of electrolyte is on fire after pin prick test in comparative example 1
Explosion, soft-package battery is not on fire after pin prick test does not explode made of electrolyte in the embodiment of the present invention 2, and security performance is high.
Fig. 3 is the cyclic curve before soft-package battery pin prick test of the present invention in 0.1C, as seen from Figure 4, needle thorn examination
Before testing, the cycle performance of two kinds of soft-package batteries is similar.
Voltage change curve when Fig. 4 is soft-package battery pin prick test made of 1 electrolyte of comparative example of the present invention, Fig. 5 are
Voltage change curve when soft-package battery pin prick test made of 2 electrolyte of the embodiment of the present invention.It can be seen from Fig. 4~5 originally
Voltage is substantially unchanged in soft-package battery acupuncture course in inventive embodiments 2, and the electricity of Soft Roll made of electrolyte in comparative example 1
Pond voltage in acupuncture course sharply declines, and illustrates that battery performance is unstable, safety coefficient is low.
Temperature variation curve when Fig. 6 is soft-package battery pin prick test made of 1 electrolyte of comparative example of the present invention, Fig. 7 are
Temperature variation curve when soft-package battery pin prick test made of 2 electrolyte of the embodiment of the present invention.It can be seen from Fig. 6~7 originally
Temperature change only has more than ten degrees Celsius in soft-package battery acupuncture course in inventive embodiments 2, and variation degree is smaller, and comparative example
The temperature change value in acupuncture course of soft-package battery made of electrolyte is up to 300 DEG C in 1, and temperature sharply increase and under
Drop, illustrates that battery performance is unstable, safety coefficient is low.
Electrolyte in the present invention it can be seen from above-mentioned experiment not only has and the comparable excellent electrification of liquid electrolyte
Performance is learned, while also having had both the high security of solid electrolyte, is a kind of safety and practical electrolyte.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of lithium ion battery electrolyte is made of the lithium salts of 0.5~4mol/L, silane-modified inorganic filler and solvent；
Silane used in the silane-modified inorganic filler is octyltri-ethoxysilane；
Inorganic filler used in the silane-modified inorganic filler is selected from aluminum oxide and/or silica；The silicon
Mass concentration of the modified inorganic filler of alkane in the lithium ion battery electrolyte is 3~15wt%；
The solvent includes ethylene carbonate, dimethyl carbonate, dimethyl ether, fluorinated ethylene carbonate, methyl ethyl carbonate, carbonic acid third
One or more of enester and diethyl carbonate.
2. lithium ion battery electrolyte according to claim 1, which is characterized in that the concentration of the lithium salts is 1~4mol/
L。
3. lithium ion battery electrolyte according to claim 1, which is characterized in that the lithium salts include lithium hexafluoro phosphate,
LiBF4, lithium perchlorate, trifluoromethanesulfonic acid lithium, double trifluoromethanesulfonimide lithiums, double fluorine sulfimide lithiums, four cyanogen boric acid
One or more of lithium, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium and difluoro dimalonic acid lithium borate.
4. lithium ion battery electrolyte according to claim 1, which is characterized in that the silane-modified inorganic filler
Mass concentration is 5~10wt%.
5. a kind of lithium ion battery, including lithium ion battery electrolyte described in Claims 1 to 4 any one.
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| CN110867624B (en) * | 2019-10-15 | 2023-06-27 | 湖南法恩莱特新能源科技有限公司 | Method for recycling lithium battery electrolyte |
| CN112768771B (en) | 2021-01-27 | 2023-02-10 | 上海奥威科技开发有限公司 | Lithium ion electrolyte and preparation method and application thereof |
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| CN103825046A (en) * | 2014-03-17 | 2014-05-28 | 西南石油大学 | Gel polymer electrolyte with inorganic fillers |
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