CN107689462A - A kind of low-temperature electrolyte of ferric phosphate lithium ion battery - Google Patents
A kind of low-temperature electrolyte of ferric phosphate lithium ion battery Download PDFInfo
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- CN107689462A CN107689462A CN201710602915.3A CN201710602915A CN107689462A CN 107689462 A CN107689462 A CN 107689462A CN 201710602915 A CN201710602915 A CN 201710602915A CN 107689462 A CN107689462 A CN 107689462A
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- additive
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- organic solvent
- ion battery
- lithium ion
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Classifications
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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
-
- 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
- H01M10/0568—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
-
- 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 present invention relates to a kind of low-temperature electrolyte of ferric phosphate lithium ion battery, it is made up of organic solvent, additive and lithium salts, it is characterised in that the organic solvent, additive and lithium salts are respectively in hundred parts of contents of quality of low-temperature electrolyte：Organic solvent 50 85%, additive 7 25%, lithium salts 35 55%；The organic solvent is two or more the combination in ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, methyl propionate, ethyl propionate, ethyl acetate；The lithium salts includes main salt and auxiliary salt, and main salt is LiPF6, auxiliary salt is LiPF4, one or two or more kinds of combinations in LiTFSI, LiBOB；The additive is two or more the combination in PS, MB, EB, FEC, ethers and sulfone class；Ion concentration in lithium salt solution is 0.9 1.4mol/L.The present invention has the protrusion technical characterstic to be worked under 20 DEG C of good low temperature properties, adaptation environment and beneficial effect.
Description
Technical field
The present invention relates to a kind of low-temperature electrolyte of ferric phosphate lithium ion battery, it is low to be that one kind can improve ferric phosphate lithium cell
The organic electrolyte of warm nature energy.Belong to technical field of lithium ion.
Background technology
As one of new energy, lithium ion battery has a great development in recent years, and automobile vendor both domestic and external one after another will
Lithium ion battery is used for new-energy automobile.As National 863 plan " the energy-conservation and new-energy automobile " end of the year 2006 formally start
Afterwards, and the Department of Science and Technology in 2011 puts into effect《National " 12 " scientific and technological development planning》, and the new energy in this planning
Automobile is put in important position,《12 planning》It is proposed, implement in full：" pure electric drive " technology shifts strategy, implements new energy
Source auto technology industrialization engineering.
Because the cryogenic property of the lithium ion battery particularly ferric phosphate lithium ion battery of prior art is bad, it is most of very
Hardly possible works under -20 DEG C of environment, and the area such as the northern area of China and the Europe of foreign countries, North America, and the temperature in winter is all -20
Below DEG C, therefore, the lithium ion battery particularly ferric phosphate lithium ion battery of prior art be not suitable in the northern area of China and
The areas such as external Europe, North America are used, i.e. the lithium ion battery of prior art particularly ferric phosphate lithium ion battery is promoted
Using being greatly limited.
The content of the invention
The purpose of the present invention, it is that the cryogenic property of the ferric phosphate lithium ion battery of prior art is bad, is difficult in order to solve
The problem of being worked under -20 DEG C of environment, there is provided a kind of low-temperature electrolyte of ferric phosphate lithium ion battery, using the low-temperature electrolyte
Ferric phosphate lithium ion battery, there are good low temperature properties, adapt to the characteristics of working under -20 DEG C of environment.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of low-temperature electrolyte of ferric phosphate lithium ion battery, is made up of organic solvent, additive and lithium salts, and its feature exists
In the organic solvent, additive and lithium salts are respectively in hundred parts of contents of quality of low-temperature electrolyte：Organic solvent 50-85%,
Additive 7-25%, lithium salts 35-55%；The organic solvent is ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, carbonic acid
Two or more combination in dimethyl ester, methyl propionate, ethyl propionate, ethyl acetate；The lithium salts include main salt and
Auxiliary salt, main salt are LiPF6, auxiliary salt is LiPF4, one or two or more kinds of combinations in LiTFSI, LiBOB；The additive is
Two or more combination in PS, MB, EB, FEC, ethers and sulfone class；Ion concentration in lithium salt solution is 0.9-
1.4mol/L。
The purpose of the present invention can also be reached by adopting the following technical scheme that：
Further, the ethers is tetrahydrofuran, the aromatic oxide of biphenol two or glycol dimethyl ether, and the sulfone class is ring
Fourth sulfone, first ethyl sulfone, vinyl sulfone(RemzaolHuo Xingranliaohuoxingjituan) or dimethyl sulfoxide (DMSO).
Further, the purity of the organic solvent is 99.99%, and the purity of the additive is 99.99%.
The present invention has beneficial effect prominent as follows：
1st, the low-temperature electrolyte of claimed ferric phosphate lithium ion battery, by organic solvent, additive and lithium
Salt forms, and the organic solvent is ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, methyl propionate, third
Two or more combination in acetoacetic ester, ethyl acetate；The lithium salts includes main salt and auxiliary salt, and main salt is LiPF6, it is auxiliary
Salt is LiPF4, one or two or more kinds of combinations in LiTFSI, LiBOB；The additive be PS, MB, EB, FEC, ethers and
Two or more combination in sulfone class；With the characteristics of fusing point is low, viscosity is small and electrical conductivity is high, existing skill can solve the problem that
The cryogenic property of the ferric phosphate lithium ion battery of art is bad, the problem of being difficult to work under -20 DEG C of environment, using the low-temperature electrolytic
The ferric phosphate lithium ion battery of liquid, there are good low temperature properties, adapt under -20 DEG C of environment the protrusion technical characterstic that works and beneficial
Effect.
2nd, the present invention still keeps higher electrical conductivity, therefore thus phosphoric acid made of electrolyte at -20 DEG C of low temperature
Lithium iron battery is more suitable for discharging under cryogenic conditions, can be obviously improved the cryogenic property of battery.
3rd, the additive in organic electrolyte of the invention can form stable and electrochemical performance SEI films, can change
Kind contact resistance between electrolyte and positive and negative pole material, and the electrical property under the battery normal temperature and hot conditions ensured will
Ask.
Embodiment
Specific embodiment 1：
The low-temperature electrolyte for the ferric phosphate lithium ion battery that the present embodiment is related to, by organic solvent, additive and lithium salts group
Into, it is characterised in that the organic solvent, additive and lithium salts are respectively in hundred parts of contents of quality of low-temperature electrolyte：It is organic
Solvent 50-85%, additive 7-25%, lithium salts 35-55%；The organic solvent is ethylene carbonate, methyl ethyl carbonate, carbonic acid
Two or more combination in diethylester, dimethyl carbonate, methyl propionate, ethyl propionate, ethyl acetate；The lithium salts
Including main salt and auxiliary salt, main salt is LiPF6, auxiliary salt is LiPF4, one or two or more kinds of combinations in LiTFSI, LiBOB；It is described
Additive is two or more the combination in PS, MB, EB, FEC, ethers and sulfone class；Ion concentration in lithium salt solution
For 0.9-1.4mol/L.
In the present embodiment：
The ethers is tetrahydrofuran, the aromatic oxide of biphenol two or glycol dimethyl ether, and the sulfone class is sulfolane, first and second
Base sulfone, vinyl sulfone(RemzaolHuo Xingranliaohuoxingjituan) or dimethyl sulfoxide (DMSO).The purity of the organic solvent is 99.99%, and the purity of the additive is
99.99%.
The preparation method of the present embodiment is as follows：
Purity is purified respectively in 99.99% solvent and additive, molecular sieve is added and carries out physics dehydration, control
Then molecular sieve is carried out the higher solvent of purity after physics dehydration and additive is well mixed in 0-20ppm by moisture, then by than
Example adds lithium salt solution, after fully dissolving is well mixed, shelves 36 hours, that is, obtains the low-temperature electrolytic of ferric phosphate lithium ion battery
Liquid.
Application example 1：
The EC in mass ratio in glove box:EMC:DMC:EP=1：1：1：1 solvent and 10% additive and 1.2mol/
The organic electrolyte of L lithium salts configuration, is sealed in then Soft Roll 20Ah that the electrolyte is injected into drying LiFePO4 battery core
Forming and capacity dividing obtains low-temperature lithium ion battery.
By test, in the low-temperature lithium ion battery of gained, -20 DEG C of 1C discharge capacities of low temperature are normal temperature discharge capacity
71%, -30 DEG C of 1C discharge capacities of low temperature are the 60% of normal temperature discharge capacity.The capability retention that normal temperature 1C discharge and recharges are 500 times is big
In 94%.
Application example 2：
The EC in mass ratio in glove box:EMC:DMC:EP:PA=1：1：1：1：1 solvent and 10% additive and
The organic electrolyte of 1.2mol/L lithium salts configuration, then the electrolyte is injected into the Soft Roll 20Ah of drying LiFePO4 battery core
Middle sealing forming and capacity dividing obtains low-temperature lithium ion battery.
By test, in the low-temperature lithium ion battery of gained, -20 DEG C of 1C discharge capacities of low temperature are normal temperature discharge capacity
75%, -30 DEG C of 1C discharge capacities of low temperature are the 64% of normal temperature discharge capacity.The capability retention that normal temperature 1C discharge and recharges are 500 times is big
In 95.5%.
Application example 3：
The EC in mass ratio in glove box:EMC:DMC:EP：PA=1：1：1：2：2 solvent and 10% additive and
The organic electrolyte of 1.1mol/L lithium salts configuration, then the electrolyte is injected into the Soft Roll 20Ah of drying LiFePO4 battery core
Middle sealing forming and capacity dividing obtains low-temperature lithium ion battery.
By test, in the low-temperature lithium ion battery of gained, -20 DEG C of 1C discharge capacities of low temperature are normal temperature discharge capacity
78%, -30 DEG C of 1C discharge capacities of low temperature are the 67% of normal temperature discharge capacity.The capability retention that normal temperature 1C discharge and recharges are 500 times is big
In 94.5%.
Application example 4：
The EC in mass ratio in glove box:EMC:DMC:EP：PA=1：1：1：1：2 solvent and 10% additive and
The organic electrolyte of 1.1mol/L lithium salts configuration, then the electrolyte is injected into the Soft Roll 20Ah of drying LiFePO4 battery core
Middle sealing forming and capacity dividing obtains low-temperature lithium ion battery.
By test, in the low-temperature lithium ion battery of gained, -20 DEG C of 1C discharge capacities of low temperature are normal temperature discharge capacity
76%, -30 DEG C of 1C discharge capacities of low temperature are the 65% of normal temperature discharge capacity.The capability retention that normal temperature 1C discharge and recharges are 500 times is big
In 95%.
Application example 5：
The EC in mass ratio in glove box:EMC:DMC:EP：PA=1：1：1：2：1 solvent and 10% additive and
The organic electrolyte of 1.1mol/L lithium salts configuration, then the electrolyte is injected into the Soft Roll 20Ah of drying LiFePO4 battery core
Middle sealing forming and capacity dividing obtains low-temperature lithium ion battery.
By test, in the low-temperature lithium ion battery of gained, -20 DEG C of 1C discharge capacities of low temperature are normal temperature discharge capacity
73%, -30 DEG C of 1C discharge capacities of low temperature are the 62% of normal temperature discharge capacity.The capability retention that normal temperature 1C discharge and recharges are 500 times is big
In 93.5%.
A kind of cryogenic property electrolyte of lithium ion battery of the present invention, is not restricted to institute in specification and embodiment
Description, therefore additional advantage and modification are easily achieved for the personnel of familiar field, therefore wanted without departing substantially from right
Ask and the spirit and scope of universal that equivalency range is limited in the case of, protection scope of the present invention is not limited to this
A little examples.
Claims (3)
1. a kind of low-temperature electrolyte of ferric phosphate lithium ion battery, is made up of organic solvent, additive and lithium salts, its feature exists
In the organic solvent, additive and lithium salts are respectively in hundred parts of contents of quality of low-temperature electrolyte：Organic solvent 50-85%,
Additive 7-25%, lithium salts 35-55%；The organic solvent is ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, carbonic acid
Two or more combination in dimethyl ester, methyl propionate, ethyl propionate, ethyl acetate；The lithium salts include main salt and
Auxiliary salt, main salt are LiPF6, auxiliary salt is LiPF4, one or two or more kinds of combinations in LiTFSI, LiBOB；The additive is
Two or more combination in PS, MB, EB, FEC, ethers and sulfone class；Ion concentration in lithium salt solution is 0.9-
1.4mol/L。
A kind of 2. low-temperature electrolyte of ferric phosphate lithium ion battery according to claim 1, it is characterised in that：The ethers
For tetrahydrofuran, the aromatic oxide of biphenol two or glycol dimethyl ether, the sulfone class is sulfolane, first ethyl sulfone, vinyl sulfone(RemzaolHuo Xingranliaohuoxingjituan) or two
Methyl sulfoxide.
A kind of 3. low-temperature electrolyte of ferric phosphate lithium ion battery according to claim 1 or 2, it is characterised in that：It is described
The purity of organic solvent is 99.99%, and the purity of the additive is 99.99%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710602915.3A CN107689462A (en) | 2017-07-22 | 2017-07-22 | A kind of low-temperature electrolyte of ferric phosphate lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710602915.3A CN107689462A (en) | 2017-07-22 | 2017-07-22 | A kind of low-temperature electrolyte of ferric phosphate lithium ion battery |
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| CN107689462A true CN107689462A (en) | 2018-02-13 |
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| CN201710602915.3A Pending CN107689462A (en) | 2017-07-22 | 2017-07-22 | A kind of low-temperature electrolyte of ferric phosphate lithium ion battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119699A (en) * | 2018-08-30 | 2019-01-01 | 成都市银隆新能源产业技术研究有限公司 | Low temperature improved lithium titanate battery and preparation method thereof |
| CN109273763A (en) * | 2018-09-06 | 2019-01-25 | 贵州兴锂新能源科技有限公司 | It is a kind of using lithium titanate as the lithium-ion battery electrolytes of cathode |
| CN109301324A (en) * | 2018-09-11 | 2019-02-01 | 天津市捷威动力工业有限公司 | A kind of lithium ion battery with high energy density electrolyte |
| CN110459807A (en) * | 2019-08-14 | 2019-11-15 | 超容新能源科技有限公司 | A kind of dissolution in low temperature liquid of lithium battery |
| CN111403732A (en) * | 2020-03-30 | 2020-07-10 | 江西安驰新能源科技有限公司 | High-energy-density lithium iron phosphate battery |
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| CN102361097A (en) * | 2011-11-14 | 2012-02-22 | 中国海洋石油总公司 | Preparation method of low-temperature electrolyte for lithium iron phosphate power battery |
| CN103219544A (en) * | 2013-04-10 | 2013-07-24 | 山东威高东生新能源科技有限公司 | Low-temperature electrolyte for ternary power lithium ion battery and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109119699A (en) * | 2018-08-30 | 2019-01-01 | 成都市银隆新能源产业技术研究有限公司 | Low temperature improved lithium titanate battery and preparation method thereof |
| CN109273763A (en) * | 2018-09-06 | 2019-01-25 | 贵州兴锂新能源科技有限公司 | It is a kind of using lithium titanate as the lithium-ion battery electrolytes of cathode |
| CN109301324A (en) * | 2018-09-11 | 2019-02-01 | 天津市捷威动力工业有限公司 | A kind of lithium ion battery with high energy density electrolyte |
| CN110459807A (en) * | 2019-08-14 | 2019-11-15 | 超容新能源科技有限公司 | A kind of dissolution in low temperature liquid of lithium battery |
| CN111403732A (en) * | 2020-03-30 | 2020-07-10 | 江西安驰新能源科技有限公司 | High-energy-density lithium iron phosphate battery |
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Application publication date: 20180213 |