CN106207258A - A kind of electrolyte of low temperature lithium battery - Google Patents
A kind of electrolyte of low temperature lithium battery Download PDFInfo
- Publication number
- CN106207258A CN106207258A CN201610788459.1A CN201610788459A CN106207258A CN 106207258 A CN106207258 A CN 106207258A CN 201610788459 A CN201610788459 A CN 201610788459A CN 106207258 A CN106207258 A CN 106207258A
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- Prior art keywords
- lithium
- carbonate
- electrolyte
- low temperature
- organic solvent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—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
-
- 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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- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to field of lithium, disclose the electrolyte of a kind of low temperature lithium battery, including organic solvent, lithium salts and additive, the mass ratio of described organic solvent, lithium salts and additive is 78 90:11.5 15.5:1.3 3.7.Lithium salts in the electrolyte of original low temperature lithium battery is only lithium hexafluoro phosphate, and the present invention adds the lithium salts of a small amount of LiBF4, and the conductive effect of LiBF4 is higher than lithium hexafluoro phosphate, and the ratio added does not affects the cryogenic property of lithium salts；The present invention it is possible to additionally incorporate fluorinated ethylene carbonate, with vinylene carbonate synergism, improves the film-formation result of lithium battery, reduces impedance, improves electronics and the conduction velocity of ion under low temperature, improves lithium ion battery cold cycle performance；The mass ratio of the present invention is preferred each composition so that the performance of electrolyte is more excellent.
Description
Technical field
The invention belongs to field of lithium, the electrolyte of a kind of low temperature lithium battery.
Background technology
The features such as lithium battery has that nominal voltage is high, specific energy high, has extended cycle life, memory-less effect, and green ring
Protect, pollution-free, therefore it is widely used in the digital products such as mobile phone, notebook computer and MP3, simultaneously at electric automobile, electricity
The dynamic industry such as bicycle, defence equipment is also used widely.In recent years, lithium battery was more and more wider in the application of every field
General, that battery uses circumstance complication, the highest to the performance requirement of battery, such as rate battery, is applied on starting device
Time, it is desirable at-40 DEG C of even lower temperature, also can quickly equipment be started.But the cryogenic property of lithium-ions battery at present
Relatively poor, the particularly service behaviour in the low temperature environment below-30 DEG C is poor.
Existing lithium battery electrolytes is mainly made up of organic solvent and lithium salts, and its conductive effect is poor, especially low
Under temperature environment, electric conductivity is worse, and impedance is bigger at low ambient temperatures.
Summary of the invention
The technical problem to be solved in the present invention is to provide the electrolyte of a kind of low temperature lithium battery, improves the film forming of lithium battery
Effect, reduces impedance.
The technical scheme is that
The electrolyte of a kind of low temperature lithium battery, including organic solvent and lithium salts, also includes additive, described organic solvent,
The mass ratio of lithium salts and additive is 78-90:11.5-15.5:1.3-3.7.
Preferably, the mass ratio of described organic solvent, lithium salts and additive is 82-86:12.7-14.3:1.9-3.1.
Preferably, described organic solvent is by ethylene carbonate (EC), Ethyl methyl carbonate (EMC), Allyl carbonate (PC)
Form with diethyl carbonate (DEC), the wherein mass ratio of ethylene carbonate, Ethyl methyl carbonate, Allyl carbonate, diethyl carbonate
For 28-32:38-42:9-11:3-5.
Further, described ethylene carbonate, Ethyl methyl carbonate, Allyl carbonate, the mass ratio of diethyl carbonate
For 30-31:40-41:9-10:3-4.
Preferably, described lithium salts is that LiBF4 and lithium hexafluoro phosphate form for 0.2-1.5:11-14 in mass ratio.
Preferably, described additive is fluorinated ethylene carbonate (FEC) and vinylene carbonate (VC) is in mass ratio
1-3:0.3-0.7 composition.
The beneficial effects of the present invention is:
Lithium salts in the electrolyte of original low temperature lithium battery is only lithium hexafluoro phosphate, and the present invention adds a small amount of tetrafluoro boron
The lithium salts of acid lithium, the conductive effect of LiBF4, heat stability are higher than lithium hexafluoro phosphate, and the ratio added does not affects lithium salts
Cryogenic property；The present invention it is possible to additionally incorporate fluorinated ethylene carbonate, with vinylene carbonate synergism, improves low temperature ring
Under border, the film-formation result of lithium battery, reduces impedance, improves electronics and the conduction velocity of ion under low temperature, improves lithium-ion electric
Pond cold cycle performance；The mass ratio of the present invention is preferred each composition so that the performance of electrolyte is more excellent.
Detailed description of the invention
Embodiment 1
By 1.1g LiBF4,12.1g lithium hexafluoro phosphate, 1.2g fluorinated ethylene carbonate and 0.9g vinylene carbonate
It is dissolved in 84.7g organic solvent (30.9g ethylene carbonate, 40.2g Ethyl methyl carbonate, 9.6g Allyl carbonate, 4g carbonic acid diethyl
Ester) in, make electrolyte after mix homogeneously.
Embodiment 2
By 0.7g LiBF4,12.2g lithium hexafluoro phosphate, 1.4g fluorinated ethylene carbonate and 0.4g vinylene carbonate
It is dissolved in 85.3g organic solvent (30.7g ethylene carbonate, 40.8g Ethyl methyl carbonate, 9.9g Allyl carbonate, 3.9g carbonic acid diethyl
Ester) in, make electrolyte after mix homogeneously.
Embodiment 3
By 0.5g LiBF4,13.6g lithium hexafluoro phosphate, 2.3g fluorinated ethylene carbonate and 0.7g vinylene carbonate
It is dissolved in 83.0g organic solvent (30.1g ethylene carbonate, 40.8g Ethyl methyl carbonate, 9.0g Allyl carbonate, 3.1g carbonic acid diethyl
Ester) in, make electrolyte after mix homogeneously.
Embodiment 4
By 0.2g LiBF4,11.9g lithium hexafluoro phosphate, 1.7g fluorinated ethylene carbonate and 0.2g vinylene carbonate
It is dissolved in 86g organic solvent (31g ethylene carbonate, 41g Ethyl methyl carbonate, 10g Allyl carbonate, 4g diethyl carbonate), mixed
Electrolyte is made after closing uniformly.
Embodiment 5
By molten to 0.3g LiBF4,14g lithium hexafluoro phosphate, 2.4g fluorinated ethylene carbonate and 0.7g vinylene carbonate
In 82.6g organic solvent (30g ethylene carbonate, 40g Ethyl methyl carbonate, 9g Allyl carbonate, 3.6g diethyl carbonate), mixed
Electrolyte is made after closing uniformly.
Embodiment 6
By 1.5g LiBF4,12.8g lithium hexafluoro phosphate, 1.6g fluorinated ethylene carbonate and 0.3g vinylene carbonate
It is dissolved in 83.8g organic solvent (30g ethylene carbonate, 41g Ethyl methyl carbonate, 9.0g Allyl carbonate, 3.8g diethyl carbonate)
In, make electrolyte after mix homogeneously.
Embodiment 7
By molten to 0.5g LiBF4,11g lithium hexafluoro phosphate, 1.0g fluorinated ethylene carbonate and 0.3g vinylene carbonate
In 78g organic solvent (28g ethylene carbonate, 38g Ethyl methyl carbonate, 9g Allyl carbonate, 3g diethyl carbonate), mixing is all
Electrolyte is made after even.
Embodiment 8
By molten to 1.5g LiBF4,14g lithium hexafluoro phosphate, 2.0g fluorinated ethylene carbonate and 0.5g vinylene carbonate
In 86g organic solvent (28g ethylene carbonate, 42g Ethyl methyl carbonate, 11g Allyl carbonate, 5g diethyl carbonate), mixing
Electrolyte is made after Jun Yun.
Embodiment 9
0.7g LiBF4,12g lithium hexafluoro phosphate, 3g fluorinated ethylene carbonate and 0.7g vinylene carbonate are dissolved in
In 90g organic solvent (32g ethylene carbonate, 42g Ethyl methyl carbonate, 11g Allyl carbonate, 5g diethyl carbonate), mixing is all
Electrolyte is made after even.
Comparative example 1
11.9g lithium hexafluoro phosphate is dissolved in 88.1g organic solvent (19.8g ethylene carbonate, 50.2g Ethyl methyl carbonate,
15g Allyl carbonate, 3.1g diethyl carbonate) in, make electrolyte after mix homogeneously.
Comparative example 2
13.0g lithium hexafluoro phosphate is dissolved in 87.0g organic solvent (25.3g ethylene carbonate, 42.3g Ethyl methyl carbonate,
13.5g Allyl carbonate, 5.9g diethyl carbonate) in, make electrolyte after mix homogeneously.
Comparative example 3
3g lithium hexafluoro phosphate and 5g LiBF4 and 1g vinylene carbonate are dissolved in 91g organic solvent (40g ethylene
Alkene ester, 35g Ethyl methyl carbonate, 16g Allyl carbonate) in, make electrolyte after mix homogeneously.
Being joined by electrolyte prepared by above-described embodiment 1-9 and comparative example 1-3 moulds in shell 200Ah lithium ion battery, so
Rear measurement capacity conservation rate respectively, illustrates that electrolyte cryogenic property prepared by the present invention significantly improves.
Concrete examination criteria and testing result with shown in table 1 below:
Can be seen that from upper table 1, electrolyte prepared by the present invention joins to be moulded in shell 200Ah lithium ion battery, at-20 DEG C of bars
After depositing 24h under part, discharge capacity is all more than 92%.
It addition, battery capacity is protected after the 200Ah lithium ion battery that the electrolyte of the present invention is made circulates 500 times at-20 DEG C
Hold more than 82%；It is significantly larger than about 70% in comparative example 1,2,3.
The above embodiment is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (6)
1. an electrolyte for low temperature lithium battery, including organic solvent and lithium salts, it is characterised in that: also include additive, described
The mass ratio of organic solvent, lithium salts and additive is 78-90:11.5-15.5:1.3-3.7.
The electrolyte of a kind of low temperature lithium battery the most according to claim 1, it is characterised in that: described organic solvent, lithium
The mass ratio of salt and additive is 82-86:12.7-14.3:1.9-3.1.
The electrolyte of a kind of low temperature lithium battery the most according to claim 1, it is characterised in that: described organic solvent is by carbon
Vinyl acetate, Ethyl methyl carbonate, Allyl carbonate and diethyl carbonate composition, wherein ethylene carbonate, Ethyl methyl carbonate, carbonic acid
Propylene, the mass ratio of diethyl carbonate are 28-32:38-42:9-11:3-5.
The electrolyte of a kind of low temperature lithium battery the most according to claim 3, it is characterised in that: described ethylene carbonate,
Ethyl methyl carbonate, Allyl carbonate, the mass ratio of diethyl carbonate are 30-31:40-41:9-10:3-4.
The electrolyte of a kind of low temperature lithium battery the most according to claim 1, it is characterised in that: described lithium salts is tetrafluoro boron
Acid lithium and lithium hexafluoro phosphate form for 0.2-1.5:11-14 in mass ratio.
The electrolyte of a kind of low temperature lithium battery the most according to claim 1, it is characterised in that: described additive is fluoro
Ethylene carbonate and vinylene carbonate form for 1-3:0.3-0.7 in mass ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788459.1A CN106207258B (en) | 2016-08-30 | 2016-08-30 | A kind of electrolyte of low temperature lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788459.1A CN106207258B (en) | 2016-08-30 | 2016-08-30 | A kind of electrolyte of low temperature lithium battery |
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| CN106207258A true CN106207258A (en) | 2016-12-07 |
| CN106207258B CN106207258B (en) | 2019-06-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828895A (en) * | 2019-11-12 | 2020-02-21 | 湖南艾威尔新能源科技有限公司 | Low-temperature-resistant lithium ion battery electrolyte and lithium ion battery |
| CN112368872A (en) * | 2020-03-31 | 2021-02-12 | 宁德新能源科技有限公司 | Electrolyte and electrochemical device |
| WO2021195965A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Electrochemical device and electronic device comprising same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090166A (en) * | 2007-08-14 | 2007-12-19 | 深圳市海盈科技有限公司 | Composition of electrolyte of low temp lithium ion battery |
| CN101572331A (en) * | 2009-06-09 | 2009-11-04 | 东莞市杉杉电池材料有限公司 | Lithium ion battery electrolyte applicable to high-temperature environment and preparation method thereof |
| CN102064343A (en) * | 2010-12-21 | 2011-05-18 | 东莞市杉杉电池材料有限公司 | Novel lithium ion battery electrolyte |
| CN105576291A (en) * | 2015-12-18 | 2016-05-11 | 苏州华一新能源科技有限公司 | Lithium ion battery and electrolyte for high-voltage lithium ion battery |
-
2016
- 2016-08-30 CN CN201610788459.1A patent/CN106207258B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090166A (en) * | 2007-08-14 | 2007-12-19 | 深圳市海盈科技有限公司 | Composition of electrolyte of low temp lithium ion battery |
| CN101572331A (en) * | 2009-06-09 | 2009-11-04 | 东莞市杉杉电池材料有限公司 | Lithium ion battery electrolyte applicable to high-temperature environment and preparation method thereof |
| CN102064343A (en) * | 2010-12-21 | 2011-05-18 | 东莞市杉杉电池材料有限公司 | Novel lithium ion battery electrolyte |
| CN105576291A (en) * | 2015-12-18 | 2016-05-11 | 苏州华一新能源科技有限公司 | Lithium ion battery and electrolyte for high-voltage lithium ion battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828895A (en) * | 2019-11-12 | 2020-02-21 | 湖南艾威尔新能源科技有限公司 | Low-temperature-resistant lithium ion battery electrolyte and lithium ion battery |
| CN112368872A (en) * | 2020-03-31 | 2021-02-12 | 宁德新能源科技有限公司 | Electrolyte and electrochemical device |
| WO2021195965A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Electrochemical device and electronic device comprising same |
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| CN106207258B (en) | 2019-06-25 |
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