CN110459807A - A kind of dissolution in low temperature liquid of lithium battery - Google Patents
A kind of dissolution in low temperature liquid of lithium battery Download PDFInfo
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- CN110459807A CN110459807A CN201910751144.3A CN201910751144A CN110459807A CN 110459807 A CN110459807 A CN 110459807A CN 201910751144 A CN201910751144 A CN 201910751144A CN 110459807 A CN110459807 A CN 110459807A
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- lithium
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- carbonate
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 30
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 title claims abstract description 24
- 238000004090 dissolution Methods 0.000 title claims abstract description 23
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003960 organic solvent Substances 0.000 claims abstract description 30
- 239000003792 electrolyte Substances 0.000 claims abstract description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 20
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 20
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims abstract description 15
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 15
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims abstract description 15
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940090181 propyl acetate Drugs 0.000 claims abstract description 12
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- DEUISMFZZMAAOJ-UHFFFAOYSA-N lithium dihydrogen borate oxalic acid Chemical compound B([O-])(O)O.C(C(=O)O)(=O)O.C(C(=O)O)(=O)O.[Li+] DEUISMFZZMAAOJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 9
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims abstract description 9
- 239000010452 phosphate Substances 0.000 claims abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 claims abstract description 6
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 claims abstract description 6
- JGFBQFKZKSSODQ-UHFFFAOYSA-N Isothiocyanatocyclopropane Chemical compound S=C=NC1CC1 JGFBQFKZKSSODQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- PWLNAUNEAKQYLH-UHFFFAOYSA-N butyric acid octyl ester Natural products CCCCCCCCOC(=O)CCC PWLNAUNEAKQYLH-UHFFFAOYSA-N 0.000 claims abstract description 5
- UUIQMZJEGPQKFD-UHFFFAOYSA-N n-butyric acid methyl ester Natural products CCCC(=O)OC UUIQMZJEGPQKFD-UHFFFAOYSA-N 0.000 claims abstract description 5
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims abstract description 4
- ZQCQTPBVJCWETB-UHFFFAOYSA-N 4-fluoro-1,3-dioxol-2-one Chemical compound FC1=COC(=O)O1 ZQCQTPBVJCWETB-UHFFFAOYSA-N 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 2
- 239000005955 Ferric phosphate Substances 0.000 abstract description 4
- 229940032958 ferric phosphate Drugs 0.000 abstract description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 abstract description 4
- 229910000399 iron(III) phosphate Inorganic materials 0.000 abstract description 4
- 239000005486 organic electrolyte Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 229910052493 LiFePO4 Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- XESSXNRXAYFGSO-UHFFFAOYSA-N B([O-])([O-])[O-].[Li+].C(C(=O)O)(=O)O.[Li+].[Li+] Chemical compound B([O-])([O-])[O-].[Li+].C(C(=O)O)(=O)O.[Li+].[Li+] XESSXNRXAYFGSO-UHFFFAOYSA-N 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MPDCKIORILZMHV-UHFFFAOYSA-N boric acid;lithium;oxalic acid Chemical compound [Li].OB(O)O.OC(=O)C(O)=O MPDCKIORILZMHV-UHFFFAOYSA-N 0.000 description 1
- ABDBNWQRPYOPDF-UHFFFAOYSA-N carbonofluoridic acid Chemical compound OC(F)=O ABDBNWQRPYOPDF-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
- H01M2300/0042—Four or more solvents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention proposes a kind of dissolution in low temperature liquid of lithium battery comprising mixed organic solvents, lithium salts and additive；The mixed organic solvents include ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate；The lithium salts includes one or more of lithium hexafluoro phosphate, LiBF4, bis-trifluoromethylsulfoandimide lithium, di-oxalate lithium borate, and in the electrolyte, the concentration of lithium ion is 1.1mol/L~1.2mol/L；The additive is the one or more of propane sultone, methyl butyrate, ethyl butyrate, fluoro ethylene carbonate.The fusing point of each component is low in organic electrolyte of the invention, and viscosity is small, and conductivity is high, higher conductivity is still kept at -20 DEG C of low temperature, therefore thus ferric phosphate lithium cell made of electrolyte is more suitable for discharging under cryogenic conditions.
Description
Technical field
The present invention relates to field of lithium more particularly to a kind of dissolution in low temperature liquid of lithium battery.
Background technique
Lithium ion battery applications field is wide, including the electric terminal equipments such as mobile phone, laptop, has even moved towards electricity
Electrical automobile and technical field of energy storage；Lithium ion battery is divided into anode, cathode, diaphragm, electrolyte and shell from structure.
For low-temperature electrolyte mostly using PC solvent as main component, cryogenic property ferric phosphate lithium cell can improve 5- at present
10%, but since PC is total to plug-in effect to cathode graphite, reduces the capacity of battery core, limit using and sending out for electrolyte
Exhibition.
The object of the present invention is to provide a kind of ferric phosphate lithium cell low-temperature electrolyte with good low temperature properties, no PC
Solvent is applicable in cathode graphite lithium ion battery completely.
Summary of the invention
To achieve the above object, the present invention provides a kind of low-temperature electrolyte of lithium battery, which has good low
Warm nature energy is applicable in cathode graphite lithium ion battery completely.
The technical solution of the present invention is as follows:
A kind of dissolution in low temperature liquid of lithium battery comprising mixed organic solvents, lithium salts and additive；
The mixed organic solvents include ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, acetic acid third
Ester；
The lithium salts include lithium hexafluoro phosphate, LiBF4, bis-trifluoromethylsulfoandimide lithium, in di-oxalate lithium borate
One or more, in the electrolyte, the concentration of lithium ion is 1.1mol/L~1.2mol/L；
The additive is the one or more of propane sultone, methyl butyrate, ethyl butyrate, fluoro ethylene carbonate.
Further, in the mixed organic solvents, as mass fraction, 1 part of ethylene carbonate, 1 part of diethyl carbonate,
1 part of dimethyl carbonate, 1~2 part of ethyl acetate, 0~2 part of propyl acetate.
Further, by mass percentage, in the electrolyte, the organic solvent accounts for 13~17%.
The present invention also provides a kind of preparation methods of lithium-ion battery electrolytes comprising:
By institute's ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate using rectificating method point
It does not remove water and is stored under atmosphere of inert gases, obtain respective rectifying organic solvent；
Lithium salts vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, and the addition is added while stirring
Agent is added the lithium salts and stirs after being sufficiently mixed, lithium salts stands 0.5~1 hour after being completely dissolved, and obtains finished product electrolyte.
The advantages and beneficial effects of the present invention are:
1, the fusing point of each component is low in organic electrolyte of the invention, and viscosity is small, and conductivity is high, at -20 DEG C of low temperature still
Higher conductivity is kept, therefore thus ferric phosphate lithium cell made of electrolyte is more suitable for discharging under cryogenic conditions.
2, the additive in organic electrolyte of the invention can form stable and electrochemical performance SEI film, can change
Contact resistance between kind electrolyte and positive and negative pole material, and the electrical property under the battery room temperature and hot conditions guaranteed is wanted
It asks.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, With reference to embodiment
The present invention is described in further detail.
Embodiment 1
The dissolution in low temperature liquid of lithium battery provided in this embodiment, composition include mixed organic solvents, lithium salts and additive.
Wherein: the mixed organic solvents are mixed by the component of following weight fraction: 1 part of ethylene carbonate, diethyl carbonate 1
Part, 1 part of dimethyl carbonate, 1 part of ethyl acetate.The lithium salts is lithium hexafluoro phosphate and LiBF4, in the dissolution in low temperature
In liquid, the concentration of lithium ion is 1.2mol/L.The additive is propane sultone, by mass percentage, molten in the low temperature
It solves in liquid, the additive accounts for 13%.
Dissolution in low temperature liquid the preparation method is as follows:
Ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate are removed water and saved respectively using rectificating method
Under atmosphere of inert gases, respective rectifying organic solvent is obtained；
Lithium hexafluoro phosphate and LiBF4 vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, is added in propane sulfonic acid while stirring
Ester is added lithium hexafluoro phosphate and LiBF4, stands 0.5 hour after being completely dissolved, obtain finished product electrolyte after being sufficiently mixed.
The low-temperature electrolyte that this is prepared is injected into sealing in the LiFePO4 battery core of drying and obtains low-temperature lithium ion electricity
Pond.By test, in resulting low-temperature lithium ion battery, the 1C discharge capacity at -20 DEG C of low temperature is room temperature discharge capacity
84%, the 1C discharge capacity at -30 DEG C of low temperature is the 72% of room temperature discharge capacity.The capacity that room temperature 1C charge and discharge are 500 times is kept
Rate is greater than 92%.
Embodiment 2
The dissolution in low temperature liquid of lithium battery provided in this embodiment, composition include mixed organic solvents, lithium salts and additive.
Wherein: the mixed organic solvents are mixed by the component of following weight fraction: 1 part of ethylene carbonate, diethyl carbonate 1
Part, 1 part of dimethyl carbonate, 1 part of ethyl acetate, 1 part of propyl acetate.The lithium salts is bis-trifluoromethylsulfoandimide lithium and double oxalic acid
Lithium borate, in the dissolution in low temperature liquid, the concentration of lithium ion is 1.2mol/L.The additive is methyl butyrate, by quality
Percentage, in the dissolution in low temperature liquid, the additive accounts for 17%.
Dissolution in low temperature liquid the preparation method is as follows:
Ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate are distinguished using rectificating method
It removes water and is stored under atmosphere of inert gases, obtain respective rectifying organic solvent；
Bis-trifluoromethylsulfoandimide lithium and di-oxalate lithium borate vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, and methyl butyrate is added while stirring,
Six bis-trifluoromethylsulfoandimide lithiums and di-oxalate lithium borate are added after being sufficiently mixed, stands 0.8 hour after being completely dissolved, obtains finished product
Electrolyte.
The low-temperature electrolyte that this is prepared is injected into sealing in the LiFePO4 battery core of drying and obtains low-temperature lithium ion electricity
Pond.By test, in resulting low-temperature lithium ion battery, the 1C discharge capacity at -20 DEG C of low temperature is room temperature discharge capacity
83%, the 1C discharge capacity at -30 DEG C of low temperature is the 70% of room temperature discharge capacity.The capacity that room temperature 1C charge and discharge are 500 times is kept
Rate is greater than 94.5%.
Embodiment 3
The dissolution in low temperature liquid of lithium battery provided in this embodiment, composition include mixed organic solvents, lithium salts and additive.
Wherein: the mixed organic solvents are mixed by the component of following weight fraction: 1 part of ethylene carbonate, diethyl carbonate 1
Part, 1 part of dimethyl carbonate, 2 parts of ethyl acetate, 1 part of propyl acetate.The lithium salts be lithium hexafluoro phosphate and di-oxalate lithium borate,
In the dissolution in low temperature liquid, the concentration of lithium ion is 1.15mol/L.The additive is ethyl butyrate, by mass percentage,
In the dissolution in low temperature liquid, the additive accounts for 15%.
Dissolution in low temperature liquid the preparation method is as follows:
Ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate are distinguished using rectificating method
It removes water and is stored under atmosphere of inert gases, obtain respective rectifying organic solvent；
Lithium hexafluoro phosphate and di-oxalate lithium borate vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, and ethyl butyrate is added while stirring,
Lithium hexafluoro phosphate and di-oxalate lithium borate are added after being sufficiently mixed, ethyl butyrate is added after being completely dissolved, stands 1 after being completely dissolved
Hour, obtain finished product electrolyte.
The low-temperature electrolyte that this is prepared is injected into sealing in the LiFePO4 battery core of drying and obtains low-temperature lithium ion electricity
Pond.By test, in resulting low-temperature lithium ion battery, the 1C discharge capacity at -20 DEG C of low temperature is room temperature discharge capacity
85%, the 1C discharge capacity at -30 DEG C of low temperature is the 76% of room temperature discharge capacity.The capacity that room temperature 1C charge and discharge are 500 times is kept
Rate is greater than 93.5%.
Embodiment 4
The dissolution in low temperature liquid of lithium battery provided in this embodiment, composition include mixed organic solvents, lithium salts and additive.
Wherein: the mixed organic solvents are mixed by the component of following weight fraction: 1 part of ethylene carbonate, diethyl carbonate 1
Part, 1 part of dimethyl carbonate, 0.5 part of ethyl acetate, 2 parts of propyl acetate.The lithium salts is LiBF4 and double oxalic acid boric acid
Lithium, in the dissolution in low temperature liquid, the concentration of lithium ion is 1.1mol/L.The additive is fluoro ethylene carbonate, by quality
Percentage, in the dissolution in low temperature liquid, the additive accounts for 15%.
Dissolution in low temperature liquid the preparation method is as follows:
Ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate are distinguished using rectificating method
It removes water and is stored under atmosphere of inert gases, obtain respective rectifying organic solvent；
LiBF4 and di-oxalate lithium borate vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, and fluoro carbonic acid second is added while stirring
LiBF4 and di-oxalate lithium borate are added after mixing, stands 1 hour after being completely dissolved, obtains finished product electrolyte for alkene.
The low-temperature electrolyte that this is prepared is injected into sealing in the LiFePO4 battery core of drying and obtains low-temperature lithium ion electricity
Pond.By test, in resulting low-temperature lithium ion battery, the 1C discharge capacity at -20 DEG C of low temperature is room temperature discharge capacity
83%, the 1C discharge capacity at -30 DEG C of low temperature is the 75% of room temperature discharge capacity.The capacity that room temperature 1C charge and discharge are 500 times is kept
Rate is greater than 95%.
The description with certain particularity detailed enough has been carried out to the present invention above.Ordinary skill in fields
Personnel are it should be understood that the description in embodiment is only exemplary, before without departing from true spirit and scope of the present invention
Put make it is all change all should belong to protection scope of the present invention.Scope of the present invention is by the power
What sharp claim was defined, rather than limited by the foregoing description in embodiment.
Claims (4)
1. a kind of dissolution in low temperature liquid of lithium battery, it is characterised in that:
The composition of the electrolyte includes mixed organic solvents, lithium salts and additive；
The mixed organic solvents include ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate；
The lithium salts includes lithium hexafluoro phosphate, LiBF4, bis-trifluoromethylsulfoandimide lithium, one in di-oxalate lithium borate
Kind is several, and in the electrolyte, the concentration of lithium ion is 1.1mol/L~1.2mol/L；
The additive is the one or more of propane sultone, methyl butyrate, ethyl butyrate, fluoro ethylene carbonate.
2. dissolution in low temperature liquid as described in claim 1, it is characterised in that: in the mixed organic solvents, as mass fraction,
1 part of ethylene carbonate, 1 part of diethyl carbonate, 1 part of dimethyl carbonate, 1~2 part of ethyl acetate, 0~2 part of propyl acetate.
3. dissolution in low temperature liquid as described in claim 1, it is characterised in that: by mass percentage, described in the electrolyte
Organic solvent accounts for 13~17%.
4. a kind of preparation method for the described in any item lithium-ion battery electrolytes of claims 1 to 3, which is characterized in that
Comprising:
Ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl acetate, propyl acetate are removed water respectively using rectificating method
And be stored under atmosphere of inert gases, obtain respective rectifying organic solvent；
Lithium salts vacuum drying water removal；
The rectifying organic solvent needed for taking in proportion is slowly added into reaction kettle, and the additive is added while stirring, fills
The lithium salts is added after dividing mixing and stirs, lithium salts stands 0.5~1 hour after being completely dissolved, and obtains finished product electrolyte.
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2019
- 2019-08-14 CN CN201910751144.3A patent/CN110459807A/en active Pending
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| CN103500850A (en) * | 2013-10-23 | 2014-01-08 | 山东大学 | Low-temperature electrolyte of lithium iron phosphate battery |
| CN103779605A (en) * | 2013-12-20 | 2014-05-07 | 宁波维科电池股份有限公司 | Low-temperature lithium iron phosphate ion battery electrolyte and preparation method thereof |
| CN107069094A (en) * | 2017-03-23 | 2017-08-18 | 福建省劲德电源科技有限公司 | A kind of lithium-ion battery electrolytes of ultra-low temperature discharge |
| CN107689462A (en) * | 2017-07-22 | 2018-02-13 | 深圳卓朗新能源科技有限公司 | A kind of low-temperature electrolyte of ferric phosphate lithium ion battery |
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