CN109921094A - A kind of novel polymethoxy dialkyl ether lithium battery electrolytes and its application - Google Patents
A kind of novel polymethoxy dialkyl ether lithium battery electrolytes and its application Download PDFInfo
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Abstract
The invention belongs to lithium-ion battery electrolytes technical fields, and in particular to a kind of low polymerization degree polymethoxy dialkyl ether lithium battery electrolytes, and a kind of lithium ion battery comprising the electrolyte is further disclosed.The present invention prepares the organic solvent of lithium-ion electrolyte with the polymethoxy dialkyl ether of low polymerization degree, utilize the lower characteristic of viscosity under the polymethoxy dialkyl ether low temperature of low polymerization degree, it efficiently solves existing dimethyl carbonate equal solvent and deposits condensation extremely easy at low temperature, increase system viscosity, the resistance for causing lithium ion to move in the electrolytic solution increases, and so that the problem of cycle performance and high rate performance of lithium ion battery are affected, effectively improve the low-temperature circulating performance and low-temperature stability of lithium ion battery, and the security performance of lithium battery used is improved.
Description
Technical field
The invention belongs to lithium-ion battery electrolytes technical fields, and in particular to a kind of low polymerization degree polymethoxy dialkyl group
Ether lithium battery electrolytes, and a kind of lithium ion battery comprising the electrolyte is further disclosed.
Background technique
With the fast development of modern industry and being constantly progressive for social life mode, AND ENERGY RESOURCES CONSUMPTION IN CHINA constantly increases
Add, total energy consumption occupies second place of the world, and traditional energy is serious using bring environmental problem, but also our environmental consciousnesses
Continuous enhancing.The whole world expands lasting research around the energy problem of Green Sustainable, and lithium ion battery is due to specific volume
Amount height, memory-less effect, pollution-free, temperature limit is wide, self discharge is small, the advantages that having extended cycle life, and becomes more in fact
One of power type.
Lithium ion battery is a kind of secondary cell i.e. rechargeable battery, and it is past between a positive electrode and a negative electrode that it relies primarily on lithium ion
Multiple movement carrys out work.In charge and discharge process, Li+Insertion and deintercalation back and forth between two electrodes: and when charging, Li+Then from just
Pole deintercalation is embedded in cathode by electrolyte, cathode is made to be in lithium-rich state；It is then opposite when electric discharge.Lithium ion battery is because of its environment
Compatibility is good, has extended cycle life, the advantage that self-discharge rate is low, has evolved into most common energy storage device, is widely applied to
On portable device and electric car.
Electrolyte component is the important component of lithium ion battery, organic solvent, additive either in electrolyte
Or electrolyte lithium salt all experienced continuous development and research, and achieve more achievement.It is especially organic in electrolyte
Solvent is known as the blood of lithium ion battery, and importance is self-evident.Currently, related lithium battery electrolytes organic solvent is ground
Studying carefully has very much, including cyclic annular esters, chain esters, nitrile, sulfone class, ethers, ionic liquid etc., these solvents have been widely used
In electrolyte, and play certain effect.But using graphite in the lithium battery system of cathode, to always exist a difficulty
Topic, the i.e. cryogenic property of lithium ion battery are poor.This is mainly due to the consistency problems of electrolyte and graphite cathode, cause
Electrolyte system viscosity increases under lower temperature, has seriously affected the transmitting of lithium ion in the electrolytic solution, to affect lithium electricity
The cycle performance in pond.As it can be seen that the low temperature viscosity of organic solvent plays an important role the cryogenic property of lithium-ion electrolyte, and
The electrolyte solvent for developing a kind of low temperature performance well has positive meaning for the cycle performance for improving lithium ion battery.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in provide a kind of novel polymethoxy dialkyl ether lithium battery
Liquid is solved, the electrolyte has preferable resistance to low temperature；
Second technical problem to be solved by this invention is to provide a kind of lithium-ion electric of low-temperature circulating better performances
Pond.
In order to solve the above technical problems, the invention discloses a kind of novel polymethoxy dialkyl ether lithium battery electrolytes,
Including electrolytic salt and organic solvent；The organic solvent includes that molecular formula is CmH2m-1O(CH2O)nCmH2m-1Low polymerization degree it is poly-
The mixture of one or more of methoxyl group dialkyl ether, wherein m is the integer of 2-5, n=1 or 2.
Preferably, the low polymerization degree polymethoxy dialkyl ether is the polymethoxy di-sec-butyl ether of polymerization degree n=1.
Preferably, the organic solvent includes carbonate based organic solvent and the low polymerization degree polymethoxy dialkyl group
Ether.
Specifically, the organic solvent includes ethylene carbonate, methyl ethyl ester and the poly- methoxy of the low polymerization degree
Base dialkyl ether.
More preferably, the quality of the ethylene carbonate, methyl ethyl ester and low polymerization degree polymethoxy dialkyl ether
Than for 1:1:0.2-0.5, i.e., in the described lithium-ion electrolyte, the mass concentration of the low polymerization degree polymethoxy dialkyl ether is
9-20wt%.
Specifically, the electrolytic salt includes LiPF6, the concentration for controlling the electrolytic salt is 0.5-1.2mol/l.
The invention also discloses a kind of low temperature resistant lithium ion battery, including anode, battery cathode and described new
Type polymethoxy dialkyl ether lithium battery electrolytes.
Specifically, in the low temperature resistant lithium ion battery:
The active material of the battery cathode includes modified natural graphite or carbonaceous mesophase spherules；
The active material of the anode includes LiMn2O4 or cobalt acid lithium.
It is described the invention also discloses the purposes that polymethoxy dialkyl ether is used to prepare lithium battery electrolytes organic solvent
Polymethoxy dialkyl ether includes that molecular formula is CmH2m-1O(CH2O)nCmH2m-1Low polymerization degree polymethoxy dialkyl ether in
One or more of mixture, wherein m is the integer of 2-5, n=1 or 2.
The invention also discloses a kind of lithium battery electrolytes organic solvents, i.e., are C including molecular formulamH2m-1O(CH2O)nCmH2m-1One or more of low polymerization degree polymethoxy dialkyl ether mixture, wherein m is the integer of 2-5, n=1
Or 2.
Low polymerization degree polymethoxy dialkyl ether of the present invention is preferably the polymer that polymerization degree n is 1 or 2, and institute
The preparation for stating low polymerization degree polymethoxy dialkyl ether is made using prior art conventional method, such as using in the prior art
Simple chemical synthesis process carries out aldol reaction using metaformaldehyde (or paraformaldehyde) and the alkylol of selected structure,
The synthesis of target product polymethoxy dialkyl ether can be realized, and it is further anti-by strict control in reaction process
The conditions such as temperature, reaction pressure, the mol ratio of raw material, reaction time, the type of catalyst and dosage are answered, realize the degree of polymerization
Strict control controls the degree of polymerization of product within the scope of the low polymerization degree of n=1 or 2；And it is used using conventional in the prior art
Air-distillation or the methods of purification such as vacuum distillation obtain that the required low polymerization degree polymethoxy using purity requirement can be obtained
Dialkyl ether, and it is further used for the preparation of the lithium-ion electrolyte.
The present invention prepares the organic solvent of lithium-ion electrolyte with the polymethoxy dialkyl ether of low polymerization degree, and utilization is oligomeric
The lower characteristic of viscosity under right polymethoxy dialkyl ether low temperature efficiently solves existing dimethyl carbonate equal solvent and exists
It is extremely easy condensation under low temperature, increases system viscosity, the resistance for causing lithium ion to move in the electrolytic solution increases, and makes in turn
The problem of cycle performance and high rate performance for obtaining lithium ion battery are affected, effectively improves the low temperature of lithium ion battery
Cycle performance and low-temperature stability, and the security performance of lithium battery used is improved.
Low polymerization degree polymethoxy dialkyl ether of the present invention is preferably polymethoxy di-sec-butyl ether (n=1), tool
Have the characteristics that viscosity is low, boiling point is high, condensation point is high, not only itself has lower viscosity, but also viscosity with temperature varies less,
Even if at a lower temperature, viscosity will not vary widely.It is disclosed by the invention with the polymethoxy di-sec-butyl
Ether and common carbonate based organic solvent are used in compounding in the electrolyte of preparation, and lithium ion can be transmitted freely wherein, from
And the low-temperature circulating service life of lithium ion battery and charge/discharge capacity are all significantly improved, and reduce electrolyte
Cost.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is that polymethoxy di-sec-butyl ether (DMB (n=1)) viscosity is made with the change curve of temperature in embodiment 1；
Fig. 2 is that lithium ion battery cryogenic property test comparison curve is made in the embodiment of the present invention 1 and comparative example 1.
Specific embodiment
Low polymerization degree polymethoxy dialkyl ether of the present invention is adopted as being made using method in the prior art, as follows
A kind of feasible synthetic method is provided, is specifically comprised the following steps:
(1) it is reacted, 90-130 DEG C of reaction temperature, is used in a high pressure reaction kettle by metaformaldehyde and alkylol (m=2-5)
Macroreticular resin catalyst DFHS-7, control catalyst dosage be 2-3%, carry out reaction 3-4h, at this time the polymerization degree n of product=
1-4；The mol ratio for further controlling the metaformaldehyde and alkyl alcohol reactant is 1:2, and reaction temperature is 110 DEG C or so
When, the degree of polymerization can be obtained and control low polymerization degree methoxyl group dialkyl ether product in n=1-2 substantially；
(2) low polymerization degree methoxyl group dialkyl ether product crude product is made by air-distillation, vacuum distillation, reflux water removal
Etc. processes purified.
Contain target product polymethoxy dialkyl ether and unreacted since the product Jing Guo above-mentioned synthesis process is one
Complete alkylol, two kinds of complete reactants of unreacted of subsequent processing in order to prevent, therefore control metaformaldehyde as far as possible converts completely,
The technique for reducing subsequent processing metaformaldehyde, reacting remaining alkylol can substantially completely be removed by air-distillation.And it mentions
In pure procedure, further the reactant after air-distillation is evaporated under reduced pressure, controlled at 80-150 DEG C, the column plate number of plies
10-100 layers, the polymethoxy dialkyl ether of polymerization degree n=1 can be completely distilled off out, purity can achieve
99.5% or more.The subject polymer distilled out is removed water further across reflux, and molecular sieve, calcium hydride, work can be used in this process
Property calcium, anhydrous sodium sulfate, lithium hydride or metallic sodium removed water, control reflux temperature be 50-150 DEG C, can be obtained meet it is pure
Spend desired low polymerization degree polymethoxy dialkyl ether.
Other methods well known in the prior art for being used to prepare low polymerization degree polymethoxy dialkyl ether can be used, and
The low polymerization degree polymethoxy dialkyl ether of high-purity as far as possible is made using method of purification well known by persons skilled in the art.
And other feasibilities well known in the prior art prepare the method for low polymerization degree polymethoxy dialkyl ether that details are not described herein again.
Embodiment 1
The present embodiment is for synthesizing target product polymethoxy di-sec-butyl ether (DMB(n=1)), specific synthesis and purification
Step includes:
(1) synthesis of target product
It takes 5.0050g metaformaldehyde and 24.7100g sec-butyl alcohol to react in a high pressure reaction kettle, controls reaction temperature 110
DEG C, and the use of macroreticular resin DFHS-7 is catalyst, the dosage for controlling catalyst is 3%, stops after carrying out aldol reaction 3.5h,
The mixture of polymethoxy di-sec-butyl ether is obtained, polymerization degree n=1-4 at this time；
(2) purification of target product
Crude product obtained above is removed into unreacted sec-butyl alcohol by air-distillation, then, by above-mentioned air-distillation
Later reactant is evaporated under reduced pressure, and temperature is 80-150 DEG C, 10-100 layers of the column plate number of plies, can be by the poly- of polymerization degree n=1
Methoxyl group di-sec-butyl ether is completely distilled off out, and purity can reach 99.5% or more；Then, polymerization degree n=1 that will be isolated
Polymethoxy di-sec-butyl ether returned using molecular sieve, calcium hydride, calcium activated, anhydrous sodium sulfate, lithium hydride or metallic sodium
Stream water removal, control reflux temperature are 50-150 DEG C；Finally, obtained polymethoxy di-sec-butyl ether is carried out rectification under vacuum, control
Temperature processed is 80 DEG C -150 DEG C, and number of plates 5-30 is to get required polymethoxy di-sec-butyl ether.
Attached drawing 1 gives the viscosity of polymethoxy di-sec-butyl ether (n=1) product made from the present embodiment with temperature
Change curve, it is seen then that the low temperature viscosity that polymethoxy di-sec-butyl ether (n=1) is made in the present embodiment is lower, can meet lithium ion
The demand of electrolyte solvent.
The organic solvent that lithium battery electrolytes are prepared with polymethoxy di-sec-butyl ether made from the present embodiment, according to 1:1:
0.5 mass ratio weighs EC (ethylene carbonate), EMC (methyl ethyl carbonate), DMB (n=1) (polymethoxy di-sec-butyl respectively
Ether) obtained organic solvent is mixed, and appropriate LiPF is added6Electrolyte obtains concentration and is the electrolyte of 1mol/L, and controls poly- first
Oxygroup di-sec-butyl ether is 2wt% in the dosage of electrolyte.Used organic solvent is impregnated and is hydrogenated through over-molecular sieve
Calcium reflux dewatering, the water content for controlling electrolyte system are less than 3ppm, and fluohydric acid content is less than 3ppm.
Comparative example 1
Lithium-ion electrolyte described in this comparative example is same as Example 1, and difference is only that use is known in the state of the art
Organic solvent carry out electrolyte preparation, i.e., take EC (ethylene carbonate), EMC (methyl ethyl carbonate according to the mass ratio of 1:1:1
Ester), DMC (dimethyl carbonate) mix be made needed for organic solvent.
Electrolyte is made with embodiment 1 and comparative example 1 respectively, lithium-ion battery systems are made, the negative electrode material is to be modified
Natural graphite, conductive agent C65, the cryogenic property test comparison curve of lithium ion battery is made as shown in attached drawing 2, it is seen then that this
Using low polymerization degree polymethoxy dialkyl ether as the low-temperature circulating performance of lithium ion battery made from organic solvent in invention
More preferably, this is because being added to organic solvent prepared by the present invention, so that electrolyte still keeps lower viscous at a lower temperature
Degree, is conducive to the transmitting of lithium ion in the electrolytic solution, so that battery has preferable cycle performance at a lower temperature,
Low-temperature stability is more excellent.
Embodiment 2
The present embodiment is using polymethoxy di-sec-butyl ether made from embodiment 1 as the organic molten of lithium battery electrolytes
Agent, electrolytic salt used in electrolyte is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC):
Polymethoxy di-sec-butyl ether (DMB(n=1))=1:1:0.2；The concentration of electrolytic salt is 0.5mol/L, and controls polymethoxy
Di-sec-butyl ether is 0.01wt% in the dosage of electrolyte.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 3
The present embodiment is using polymethoxy di-sec-butyl ether made from embodiment 1 as the organic molten of lithium battery electrolytes
Agent, electrolytic salt used in electrolyte is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC):
Polymethoxy di-sec-butyl ether (DMB(n=1))=1:1:0.3；The concentration of electrolytic salt is 1.2mol/L, and controls polymethoxy
Di-sec-butyl ether is 5wt% in the dosage of electrolyte.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 4
The present embodiment uses the organic solvent of polymethoxy Anaesthetie Ether (n=1) as lithium battery electrolytes, electrolyte institute
It is LiPF with electrolytic salt6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy di-secondary
Butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt be 1mol/L, and control polymethoxy di-sec-butyl ether in
The dosage of electrolyte is 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 5
The present embodiment uses the organic solvent of polymethoxy Anaesthetie Ether (n=2) as lithium battery electrolytes, electrolyte institute
It is LiPF with electrolytic salt6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy di-secondary
Butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt be 1mol/L, and control polymethoxy di-sec-butyl ether in
The dosage of electrolyte is 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 6
The present embodiment uses the organic solvent of polymethoxy dipropyl ether (n=1) as lithium battery electrolytes, electrolyte institute
It is LiPF with electrolytic salt6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy di-secondary
Butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt be 1mol/L, and control polymethoxy di-sec-butyl ether in
The dosage of electrolyte is 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 7
The present embodiment uses the organic solvent of polymethoxy dipropyl ether (n=2) as lithium battery electrolytes, electrolyte institute
It is LiPF with electrolytic salt6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy di-secondary
Butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt be 1mol/L, and control polymethoxy di-sec-butyl ether in
The dosage of electrolyte is 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 8
The present embodiment uses the organic solvent of polymethoxy Di Iso Propyl Ether (n=1) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 9
The present embodiment uses the organic solvent of polymethoxy Di Iso Propyl Ether (n=2) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 10
The present embodiment uses the organic solvent of polymethoxy di-n-butyl ether (n=1) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 11
The present embodiment uses the organic solvent of polymethoxy di-n-butyl ether (n=2) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 12
The present embodiment uses organic solvent of the polymethoxy diisobutyl ether (n=1) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 13
The present embodiment uses organic solvent of the polymethoxy diisobutyl ether (n=2) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 14
The present embodiment uses organic solvent of the two n-pentyl ether (n=1) of polymethoxy as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 15
The present embodiment uses organic solvent of the two n-pentyl ether (n=2) of polymethoxy as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 16
The present embodiment uses the organic solvent of polymethoxy diisoamyl ether (n=1) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 17
The present embodiment uses the organic solvent of polymethoxy diisoamyl ether (n=2) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 18
The present embodiment uses organic solvent of the polymethoxy di neo-pentyl ether (n=1) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Embodiment 19
The present embodiment uses organic solvent of the polymethoxy di neo-pentyl ether (n=2) as lithium battery electrolytes, electrolyte
Electrolytic salt used is LiPF6；Organic solvent uses ethylene carbonate (EC): methyl ethyl ester (EMC): polymethoxy two
Sec-butyl ether (DMB(n=1))=1:1:0.5；The concentration of electrolytic salt is 1mol/L, and controls polymethoxy di-sec-butyl ether
In electrolyte dosage be 2wt%.
Electrolyte being made with the present embodiment, lithium-ion battery systems are made, the negative electrode material is modified natural graphite,
Conductive agent is C65, the cryogenic property that lithium ion battery is made is preferable, and low-temperature stability is more excellent.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of novel polymethoxy dialkyl ether lithium battery electrolytes, which is characterized in that including electrolytic salt and organic solvent；
The organic solvent includes that molecular formula is CmH2m-1O(CH2O)nCmH2m-1One of low polymerization degree polymethoxy dialkyl ether
Or several mixture, wherein m is the integer of 2-5, n=1 or 2.
2. novel polymethoxy dialkyl ether lithium battery electrolytes according to claim 1, which is characterized in that described oligomeric
Right polymethoxy dialkyl ether is the polymethoxy di-sec-butyl ether of polymerization degree n=1.
3. novel polymethoxy dialkyl ether lithium battery electrolytes according to claim 1 or 2, which is characterized in that described
Organic solvent includes carbonate based organic solvent and the low polymerization degree polymethoxy dialkyl ether.
4. novel polymethoxy dialkyl ether lithium battery electrolytes according to claim 3, which is characterized in that described organic
Solvent includes ethylene carbonate, methyl ethyl ester and the low polymerization degree polymethoxy dialkyl ether.
5. novel polymethoxy dialkyl ether lithium battery electrolytes according to claim 4, which is characterized in that the carbonic acid
The mass ratio of vinyl acetate, methyl ethyl ester and low polymerization degree polymethoxy dialkyl ether is 1:1:0.2-0.5.
6. novel polymethoxy dialkyl ether lithium battery electrolytes according to claim 1-5, which is characterized in that
The electrolytic salt includes LiPF6, the concentration for controlling the electrolytic salt is 0.5-1.2mol/l.
7. a kind of low temperature resistant lithium ion battery, which is characterized in that appoint including anode, battery cathode and claim 1-6
Novel polymethoxy dialkyl ether lithium battery electrolytes described in one.
8. low temperature resistant lithium ion battery according to claim 7, it is characterised in that:
The active material of the battery cathode includes modified natural graphite or carbonaceous mesophase spherules；
The active material of the anode includes LiMn2O4 or cobalt acid lithium.
9. the purposes that polymethoxy dialkyl ether is used to prepare lithium battery electrolytes organic solvent, which is characterized in that the poly- first
Oxygroup dialkyl ether includes that molecular formula is CmH2m-1O(CH2O)nCmH2m-1One of low polymerization degree polymethoxy dialkyl ether
Or several mixture, wherein m is the integer of 2-5, n=1 or 2.
10. a kind of lithium battery electrolytes organic solvent, which is characterized in that including molecular formula be CmH2m-1O(CH2O)nCmH2m-1It is low
The mixture of one or more of degree of polymerization polymethoxy dialkyl ether, wherein m is the integer of 2-5, n=1 or 2.
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