CN101557018A - Low-temperature electrolytic solution of power lithium-ion battery - Google Patents
Low-temperature electrolytic solution of power lithium-ion battery Download PDFInfo
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- CN101557018A CN101557018A CNA2009101153821A CN200910115382A CN101557018A CN 101557018 A CN101557018 A CN 101557018A CN A2009101153821 A CNA2009101153821 A CN A2009101153821A CN 200910115382 A CN200910115382 A CN 200910115382A CN 101557018 A CN101557018 A CN 101557018A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a low-temperature electrolytic solution of a power lithium-ion battery, and the solution is prepared by an organic solvent, lithium salt and an additive; the mixing weight percentages of the organic solvent, the lithium salt and the additive are as follow: 60 to 90 percent of organic solvent, 10 to 20 percent of additive and 0.6 to 1.5 mol/L of lithium salt; the organic solvent is one of or the mixture of ethylene carbonate, diethyl carbonate, methyl-carbonate, tetrahydrofuran, ethyl methyl carbonate and propylene carbonate; the additive is one or the mixture of hydroxycarboxylic acid, naphthenic alkylbenzene, diphenyl carbonate, bi-phenol bi-aryl ether, pyridine and porphyrins; and the lithium salt is LiBOB. The low-temperature electrolytic solution can be used for lithium batteries working at low temperature.
Description
Technical field
The present invention relates to the lithium ion battery low-temperature electrolyte, belong to technical field of electrochemistry.
Background technology
Lithium ion battery has been widely used in various electronic equipments because of having advantages such as light weight, specific energy height and life-span length.Except that consumer electronic product, lithium ion battery substitutes the main flow power supply that traditional ickel-cadmium cell becomes the military communication field gradually, also is the emphasis direction of novel communication power supply development.The military communication product has stricter requirement to battery behavior, and particularly requiring also can provide communication support under lower temperature.In military low temperature electrical source of power application, because storage batterys such as cadmium nickel, hydrogen nickel adopt water base electrolyte, the problem that exists low temperature to freeze, it is very difficult to work under-20 ℃ of environment, the ultra-low temperature surroundings that more is difficult to be applied to below-40 ℃.At present, under-40 ℃ or following temperature environment, generally adopt primary cell products such as lithium-sulfur cell.But there is tangible safety problem in lithium-sulfur cell.Simultaneously, primary cell only is suitable for using in a large number under the operation condition, for peaceful frequent training application scenario, the reusable power accumulator of more suitable employing.In addition, military mobile ups power, signal power source and power-equipment driving power etc. need to use lithium ion battery too, these minitype motivation power supplys have the requirement of cryogenic property in the open air too when working, and the cryogenic property of general lithium ion battery is bad, and its main cause is electrolytical problem.
Summary of the invention
The objective of the invention is for a kind of good good power lithium-ion battery low-temperature electrolyte of high low temperature charge-discharge performance, cyclical stability, low temperature high rate performance that has is provided.
The present invention is achieved through the following technical solutions:
It is as follows that power lithium-ion battery provided by the invention is formed (percentage by weight) with low-temperature electrolyte:
Organic solvent 60-90%
Additive 10-20%
Lithium salts 0.6-1.5mol/L
Organic solvent is one or more the combination in ethylene carbonate, diethyl carbonate, dimethyl carbonate, oxolane, ethyl-methyl carbonic ester, the propene carbonate;
Additive is one or more combination in hydroxycarboxylic acid, cycloalkyl group benzene, diphenyl carbonate, biphenol two aromatic oxides, pyrimidine, the porphyrin compound
Lithium salts is LiBOB
The preparation method of power lithium-ion battery electrolyte of the present invention is as follows: several organic solvents that will choose fully mix in less than 1% drying room in humidity, be configured to electrolyte solution, add additive, add a certain amount of electrolyte lithium salt then, after treating that electrolyte lithium salt fully dissolves, shelved 24 hours, and promptly obtained low-temperature electrolyte of the present invention.
The present invention's beneficial effect compared with the prior art is, (1) compares with traditional electrolyte, the fusing point boiling point of each component is low in the electrolyte of the present invention, viscosity is little, dielectric constant is big, and conductivity is big, at low temperatures, help the migration of Li+ more, therefore the power lithium-ion battery of being made by this electrolyte is fit to low temperature discharge more.Can under ultralow temperature (40 ℃) condition, discharge and recharge.(2) solvent of the electrolyte that adopts of the present invention is the high-k that has adopted the stable formation of effective dissolving that can guarantee the electrolyte lithium salts and electrode surface SEI film, low viscous solvent, so electrolyte of the present invention except having good low temperature charge-discharge performance, is not sacrificed the electrical property of its normal temperature high temperature.And can keep good positive electrode gram volume (with the LiFePO4 is 25 ℃ of examples, 120mAh/g), cyclical stability.
A kind of low-temperature electrolytic solution of power lithium-ion battery provided by the invention, be suitable for low temperature environment, reasonable mixture ratio of components, to have favorable charge-discharge performance, low temperature stable cycle performance, high rate performance good, provides electrolyte applicable to lithium batteries working under cryogenic conditions.
Description of drawings
Accompanying drawing is a low-temperature electrolytic liquid preparing process flow chart
Embodiment
Embodiment 1
By weight getting 25% ethylene carbonate, 50% dimethyl carbonate, 5% methyl formate, 5% oxolane respectively, humidity less than 1% drying room in, fully mix, be configured to electrolyte solvent, add additive, 8% hydroxycarboxylic acid, 4% cycloalkyl group benzene, 3% diphenyl carbonate, then, it is the electrolyte lithium salt LiBOB of 1.1mol/L that gradation adds total amount, treat that electrolytic salt fully dissolves after, shelve 24h; Promptly obtain low-temperature electrolyte of the present invention.
After tested, in resulting low-temperature electrolyte, the LiFePO4 3.2V 8Ah electrokinetic cell specific energy of development reaches 117W/g ,-20 and discharge capacity-40 ℃ the time respectively greater than 80% and 71% of normal temperature discharge capacity, the 1C discharge capacity is greater than 85% of the normal temperature discharge capacity in the time of-40 ℃.Normal temperature circulation 0.3C charging, the capability retention that the 1C discharge is 100 times is greater than 90%.
Embodiment 2
By weight getting 20% propene carbonate, 25% ethylene carbonate, 45% diethyl carbonate, 1% oxolane respectively, humidity less than 1% drying room in, fully mix, be configured to electrolyte solvent, add additive, 4% hydroxycarboxylic acid, cycloalkyl group benzene, 2% biphenol, two aromatic oxides, 2% pyrimidine, 1% porphyrin compound, it is the electrolytic salt LiBOB of .0.9mol/L that gradation adds total amount, after treating that electrolytic salt fully dissolves, shelve 24h; Promptly obtain low-temperature electrolyte of the present invention.
After tested, in resulting low-temperature electrolyte, the LiFePO4 3.2V 8Ah electrokinetic cell specific energy of development reaches 110W/g ,-20 and discharge capacity-40 ℃ the time respectively greater than 75% and 70% of normal temperature discharge capacity, the 1C discharge capacity is greater than 70% of the normal temperature discharge capacity in the time of-40 ℃.Normal temperature circulation 0.3C charging, the capability retention that the 1C discharge is 200 times is greater than 79%.
Embodiment 3
By weight getting 20% ethylene carbonate, 20% propylene carbonate, 50% dimethyl carbonate, 5% methyl formate, 1% oxolane respectively, humidity less than 1% drying room in, fully mix, be configured to electrolyte solvent, add additive, 4% diphenyl carbonate, it is the electrolytic salt LiBOB of 1mol/L that gradation adds total amount, after treating that electrolytic salt fully dissolves, shelve 24h; Promptly obtain low-temperature electrolyte of the present invention.
After tested, in resulting low-temperature electrolyte, the LiFePO4 3.2V 8Ah electrokinetic cell specific energy of development reaches 100W/g ,-20 and discharge capacity-40 ℃ the time respectively greater than 65% and 48% of normal temperature discharge capacity, the 1C discharge capacity is greater than 20% of the normal temperature discharge capacity in the time of-40 ℃.Normal temperature circulation 0.3C charging, the capability retention that the 1C discharge is 200 times is greater than 66%.
Embodiment 4
By weight getting 15% ethylene carbonate, 20% diethyl carbonate, 30% dimethyl carbonate, 10% ethyl-methyl carbonic ester, 5% methyl formate, 5% oxolane respectively, humidity less than 1% drying room in, fully mix, be configured to electrolyte solvent, add additive, 5% hydroxycarboxylic acid, 5% cycloalkyl group benzene, 3% diphenyl carbonate, 2% porphyrin compound are then, it is the electrolytic salt LiBOB of 1mol/L that gradation adds total amount, after treating that electrolytic salt fully dissolves, shelve 24h; Promptly obtain low-temperature electrolyte of the present invention.
After tested, in resulting low-temperature electrolyte, the LiFePO4 3.2V 8Ah electrokinetic cell specific energy of development reaches 116W/g ,-20 and discharge capacity-40 ℃ the time respectively greater than 81% and 75% of normal temperature discharge capacity, the 1C discharge capacity is greater than 80% of the normal temperature discharge capacity in the time of-40 ℃.The capability retention that the normal temperature circulation is 200 times is greater than 93%.
Claims (2)
1, a kind of low-temperature electrolytic solution of power lithium-ion battery, formulated by organic solvent, lithium salts and additive, it is characterized in that the preparation weight ratio of described organic solvent, lithium salts and additive is: organic solvent 60-90%, additive 10-20%, lithium salts 0.6-1.5mol/L.
2, a kind of low-temperature electrolytic solution of power lithium-ion battery according to claim 1 is characterized in that,
Described organic solvent is one or more the combination in ethylene carbonate, diethyl carbonate, dimethyl carbonate, oxolane, ethyl-methyl carbonic ester, the propene carbonate;
Described additive is one or more combination in hydroxycarboxylic acid, cycloalkyl group benzene, diphenyl carbonate, biphenol two aromatic oxides, pyrimidine, the porphyrin compound;
Described lithium salts is LiBOB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101153821A CN101557018A (en) | 2009-05-20 | 2009-05-20 | Low-temperature electrolytic solution of power lithium-ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009101153821A CN101557018A (en) | 2009-05-20 | 2009-05-20 | Low-temperature electrolytic solution of power lithium-ion battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841061A (en) * | 2010-05-10 | 2010-09-22 | 陈韵吉 | Low-temperature electrolyte of lithium iron phosphate power battery and preparation method thereof |
| CN103762383A (en) * | 2014-01-14 | 2014-04-30 | 南昌大学 | Lithium ion battery low-temperature electrolyte and preparation method thereof |
| CN114447427A (en) * | 2020-10-30 | 2022-05-06 | 张家港市国泰华荣化工新材料有限公司 | Non-aqueous electrolyte and lithium battery |
| CN115692837A (en) * | 2022-11-15 | 2023-02-03 | 楚能新能源股份有限公司 | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery |
-
2009
- 2009-05-20 CN CNA2009101153821A patent/CN101557018A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841061A (en) * | 2010-05-10 | 2010-09-22 | 陈韵吉 | Low-temperature electrolyte of lithium iron phosphate power battery and preparation method thereof |
| CN103762383A (en) * | 2014-01-14 | 2014-04-30 | 南昌大学 | Lithium ion battery low-temperature electrolyte and preparation method thereof |
| CN114447427A (en) * | 2020-10-30 | 2022-05-06 | 张家港市国泰华荣化工新材料有限公司 | Non-aqueous electrolyte and lithium battery |
| CN114447427B (en) * | 2020-10-30 | 2024-04-05 | 张家港市国泰华荣化工新材料有限公司 | Nonaqueous electrolyte and lithium battery |
| CN115692837A (en) * | 2022-11-15 | 2023-02-03 | 楚能新能源股份有限公司 | Low-temperature electrolyte for cylindrical battery, preparation method and lithium battery |
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Open date: 20091014 |