CN103427117A - Electrolyte solution of lithium ion power battery and application - Google Patents
Electrolyte solution of lithium ion power battery and application Download PDFInfo
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- CN103427117A CN103427117A CN2012101565217A CN201210156521A CN103427117A CN 103427117 A CN103427117 A CN 103427117A CN 2012101565217 A CN2012101565217 A CN 2012101565217A CN 201210156521 A CN201210156521 A CN 201210156521A CN 103427117 A CN103427117 A CN 103427117A
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- 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 relates to an electrolyte solution of a lithium ion power battery and the lithium ion power battery containing the electrolyte solution. The electrolyte solution comprises an electrolyte and an organic solvent, and also comprises an additive. The additive consists of the following components based on the total weight of the electrolyte solution, 1-4% of vinylene carbonate, 0.5-2% of propylene sulfite and 0.5-2% of butanedinitrile. The electrolyte solution has four solvent systems, so that the electrolyte has appropriate dielectric constant and viscosity; by adding three functional additives, a compact stable SEI film is formed, and also the high-temperature SEI film is improved in stability at a high temperature, and thus the high temperature resistance of the electrolyte solution is improved; the electrolyte solution has a salt density of 1-1.5 mol/L and higher electrolyte solution conductivity, and is capable of effectively improving multiplying power and power characteristics of a lithium iron phosphate power battery; and the lithium ion power battery has high capacity conservation rate and capacity restoration ratio and good cycle performance when stored at a high temperature.
Description
Technical field
The present invention relates to technical field of lithium ion, relate in particular to a kind of electrolyte and application of lithium-ion-power cell.
Background technology
Lithium ion battery, because energy density is large, operating voltage is high, circulate long-life length, high power, advantages of environment protection, becomes the focus of current new energy field research.To the demand of high capacity lithium ion battery, there is high security, high power capacity, high power in the urgent need to exploitation, the lithium-ion-power cell of long-life and environmental protection along with the fast development of lithium ion battery and electric automobile.Lithium iron phosphate dynamic battery has that operating voltage is high, specific capacity is high, has extended cycle life, and cheap and advantages of environment protection, gradually at lithium-ion-power cell market dominate.
Electrolyte, as the important component part of battery, plays a part to carry lithium ion between the positive and negative electrode of lithium ion battery, is known as " blood " of lithium ion battery.Its vital effect such as specific capacity, operating temperature range, cycle efficieny and security performance to battery; Selecting suitable electrolyte is the key that obtains the good lithium rechargeable battery of high-energy-density, long circulation life and fail safe, therefore to develop the electrolyte that meets the lithium iron phosphate dynamic battery demand extremely important; At present lithium iron phosphate dynamic battery deposits that at high temperature capacitance loss is rapid, and cycle performance is poor, can not meet often requirements of one's work under high temperature (being greater than 45 ℃) condition of electrokinetic cell; For meeting the demand, exploitation meets the electrolyte that lithium iron phosphate dynamic battery is worked under hot conditions, the exploitation of high-temperature electrolyte is tended to optimize the composition of solvent and is added suitable additive, thereby improve resistance to oxidation, the resistance to elevated temperatures of electrolyte, improve lithium iron phosphate dynamic battery cycle performance at high temperature.
Chinese patent publication No. CN 102324563 A, date of publication on January 18th, 2012, name is called lithium-ion battery electrolytes and lithium ion battery, the lithium ion battery that this application case discloses lithium-ion battery electrolytes and used this electrolyte, each ingredients weight parts of described electrolyte is respectively: 10 parts of lithium salts, organic solvent 55-80 part, additive 0.4-2 part; Wherein lithium salts is lithium hexafluoro phosphate, and organic solvent is vinyl carbonate and diethyl carbonate, and additive comprises HMDS.Its weak point is, lithium ion battery capacitance loss under hot environment is rapid, and cycle performance is poor.
Summary of the invention
The object of the invention is in order to solve lithium ion battery capacitance loss under hot environment rapid, the defect that cycle performance is poor and provide a kind of under hot environment capability retention high, the electrolyte of the lithium-ion-power cell of good cycle.
Another object of the present invention is to provide a kind of application of electrolyte of lithium-ion-power cell.
To achieve these goals, the present invention is by the following technical solutions:
A kind of electrolyte of lithium-ion-power cell, comprise electrolyte and organic solvent, also comprise additive, described additive be take the one-tenth that the electrolyte total weight is benchmark and is grouped into by following: the succinonitrile of the vinylene carbonate of 1-4%, the propylene sulfite of 0.5-2% and 0.5-2%.In the technical program, use vinylene carbonate, propylene sulfite and succinonitrile as additive, formed form compact and stable SEI film, and the interpolation of three kinds of materials has improved high temperature SEI film stability at high temperature, has improved the resistance to elevated temperatures of electrolyte.
As preferably, described electrolyte is lithium hexafluoro phosphate, and in electrolyte, electrolytical concentration is 1-1.5mol/L.In the technical program, the concentration of electrolyte lithium hexafluoro phosphate is 1-1.5mol/L, and electrolytic conductivity is high, can effectively improve odds and the power characteristic of lithium iron phosphate dynamic battery.
As preferably, described organic solvent is ethylene carbonate, propene carbonate, and methyl ethyl carbonate, the mixed liquor of diethyl carbonate, wherein, and ethylene carbonate, propene carbonate, methyl ethyl carbonate, the volume ratio of diethyl carbonate is 5-10:1:5-8:3-8.In the technical program, electrolyte adopts four dicyandiamide solutions, makes electrolyte have suitable dielectric constant and viscosity.
The present invention also provides a kind of application of electrolyte of lithium-ion-power cell, is about to electrolyte of the present invention and is made into lithium-ion-power cell, comprises positive pole, negative pole, barrier film and electrolyte, and electrolyte is electrolyte of the present invention described above.
Because improvement of the present invention is the electrolyte of lithium-ion-power cell, therefore in lithium-ion-power cell provided by the invention, positive pole, negative pole, barrier film have no particular limits, those of ordinary skills can select all available positive poles, negative pole, barrier film according to the instruction of prior art fully, in conjunction with front, the description of electrolyte of the present invention are realized the present invention and reach purpose of the present invention.
Beneficial effect of the present invention:
1. electrolyte adopts four dicyandiamide solutions, makes electrolyte have suitable dielectric constant and viscosity; Add three kinds of functional additives, form form compact and stable SEI film, improve high temperature SEI film stability at high temperature simultaneously, improved the resistance to elevated temperatures of electrolyte; The electrolyte lithium salt is 1-1.5mol/L, and electrolytic conductivity is higher, can effectively improve multiplying power and the power characteristic of lithium iron phosphate dynamic battery;
2. lithium-ion-power cell stores under the condition of high temperature, and capability retention and capacity restoration rate are high, and cycle performance is good.
The accompanying drawing explanation
The cyclic curve figure of the prepared lithium-ion-power cell of Fig. 1 embodiment of the present invention 1 under 55 ℃ of conditions.
Embodiment
Below in conjunction with specific embodiment, the present invention is further explained:
Embodiment 1
The preparation of electrolyte: by ethylene carbonate, propene carbonate, methyl ethyl carbonate, diethyl carbonate 5:1:8:8 by volume mixes, then add wherein vinylene carbonate, propylene sulfite and succinonitrile, in 55 ℃ of heating, it is dissolved, add wherein the electrolyte lithium hexafluoro phosphate and be made into the electrolyte that concentration is 1.3mol/L; Wherein the single composition of additive accounts for the percentage by weight of whole electrolyte and is: vinylene carbonate 2%, propylene sulfite 1%, succinonitrile 1%.
Anodal preparation: by 95 gram polyvinylidene fluoride (Atuofeina Corp, 761#PVDF) be dissolved in 1425 gram N-methyl-2 pyrrolidones (NMP) solvents and make binder solution, then to the LiFePO4 (Ningbo Yingtewei New Materials Co., Ltd.) that adds 2650 grams in solution, fully mix and make anode sizing agent, this anode sizing agent is applied to uniformly on the aluminium foil of 20 μ m, through 130 ℃ of dryings 2 hours, obtain positive plate after calendering.
The preparation of negative pole: by 30 gram CMC CMC(Jiangmen quantum high-tech companies, model C MC1500) and 75 gram butadiene-styrene rubber (SBR) latex (Nantong Shen Hua chemical companies, trade mark TAIPOL1500E) be dissolved in 1940 gram water, make binder solution, by 1475 gram graphite (SODIFF company commodity, the trade mark is DAG84) join in this binder solution, mix and make the graphite cathode slurry, this cathode size is uniformly coated on the Copper Foil that 12 μ m are thick and, through 130 ℃ of dryings 1.5 hours, obtains negative plate after calendering.
The preparation of battery: the polypropylene diaphragm after positive and negative plate and 20 μ m is wound into to the rectangular lithium ion battery battery core, pack in battery case and welded, subsequently the prepared electrolyte in front is injected in battery case, the lithium-ion-power cell that capacity is 10Ah is made in sealing.
Embodiment 2
The preparation of electrolyte: by ethylene carbonate, propene carbonate, methyl ethyl carbonate, diethyl carbonate 8:1:6:5 by volume mixes, add wherein vinylene carbonate, propylene sulfite and succinonitrile, in 50 ℃ of heating, it is dissolved, then add wherein the electrolyte lithium hexafluoro phosphate and be made into the electrolyte that concentration is 1mol/L; Wherein the single composition of additive accounts for the percentage by weight of whole electrolyte and is: vinylene carbonate 1%, propylene sulfite 0.5%, succinonitrile 2%.
The electrolyte that adopts the present embodiment to make according to the same procedure of embodiment 1 is prepared the lithium-ion-power cell that capacity is 10Ah.
Embodiment 3
The preparation of electrolyte: by ethylene carbonate, propene carbonate, methyl ethyl carbonate, diethyl carbonate 10:1:5:3 by volume mixes, add wherein vinylene carbonate, propylene sulfite and succinonitrile, in 60 ℃ of heating, it is dissolved, then add wherein the electrolyte lithium hexafluoro phosphate and be made into the electrolyte that concentration is 1.5mol/L; Wherein the single composition of additive accounts for the percentage by weight of whole electrolyte and is: vinylene carbonate 4%, propylene sulfite 2%, succinonitrile 0.5%.
The electrolyte that adopts the present embodiment to make according to the same procedure of embodiment 1 is prepared the lithium-ion-power cell that capacity is 10Ah.
Comparative Examples 1, roughly the same with embodiment 1, difference is not add additive.
Comparative Examples 2, in electrolyte, electrolytical concentration is 0.8mol/L, does not add additive, other compositions are identical with embodiment 2 with making step.
Embodiment 1-3 and Comparative Examples 1,2 are carried out to 60 ℃ of storage data tests.
Table 1 is the test data contrast.
Table 1, test data contrast
As can be seen from Table 1, adopt the prepared lithium-ion-power cell of electrolyte of the present invention, capability retention is greater than 94%, and the capacity restoration rate is greater than 95%, under the condition of high temperature, stores, and capability retention and capacity restoration rate are high.
As can be seen from Figure 1, under 55 ℃ of conditions, the electrolyte of the prepared lithium-ion-power cell of the present invention is applied on lithium ion battery, and when circulation 1200 circle, capacity is 85%.Therefore the obtained lithium-ion-power cell cycle performance of electrolyte of the present invention is good.
Claims (4)
1. the electrolyte of a lithium-ion-power cell, it is characterized in that, described electrolyte is comprised of electrolyte, organic solvent and additive, and described additive be take the one-tenth that the electrolyte total weight is benchmark and is grouped into by following: the succinonitrile of the vinylene carbonate of 1-4%, the propylene sulfite of 0.5-2% and 0.5-2%.
2. the electrolyte of a kind of lithium-ion-power cell according to claim 1, is characterized in that, described electrolyte is lithium hexafluoro phosphate, and in electrolyte, electrolytical concentration is 1-1.5mol/L.
3. the electrolyte of a kind of lithium-ion-power cell according to claim 1 and 2, it is characterized in that, described organic solvent is ethylene carbonate, propene carbonate, methyl ethyl carbonate, the mixed liquor of diethyl carbonate, wherein, ethylene carbonate, propene carbonate, methyl ethyl carbonate, the volume ratio of diethyl carbonate is 5-10:1:5-8:3-8.
4. the application of the electrolyte of a lithium-ion-power cell, is characterized in that, described lithium-ion-power cell includes the described electrolyte of one of claim 1-3.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779606A (en) * | 2013-12-19 | 2014-05-07 | 宁波维科电池股份有限公司 | Electrolyte of lithium ion battery and application of electrolyte |
| CN104393331A (en) * | 2014-11-17 | 2015-03-04 | 云南锡业集团（控股）有限责任公司 | Lithium iron phosphate power battery and preparation method thereof |
| CN106030889A (en) * | 2014-02-25 | 2016-10-12 | 三菱化学株式会社 | Nonaqueous electrolyte solution and nonaqueous-electrolyte-solution secondary battery using same |
| CN106450047A (en) * | 2016-10-17 | 2017-02-22 | 中盐安徽红四方锂电有限公司 | High-temperature lithium ion power battery and making method thereof |
| CN106654128A (en) * | 2017-01-18 | 2017-05-10 | 宁德新能源科技有限公司 | Secondary battery |
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| US20050208371A1 (en) * | 2004-01-15 | 2005-09-22 | Lg Chem, Ltd. | Electrochemical device comprising aliphatic nitrile compound |
| CN102244296A (en) * | 2011-06-14 | 2011-11-16 | 东莞新能源科技有限公司 | Lithium ion battery and electrolyte thereof |
| CN102324568A (en) * | 2011-09-15 | 2012-01-18 | 诺莱特科技(苏州)有限公司 | Electrolyte solution for improving swelling of lithium ion battery |
-
2012
- 2012-05-21 CN CN2012101565217A patent/CN103427117A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050208371A1 (en) * | 2004-01-15 | 2005-09-22 | Lg Chem, Ltd. | Electrochemical device comprising aliphatic nitrile compound |
| CN102244296A (en) * | 2011-06-14 | 2011-11-16 | 东莞新能源科技有限公司 | Lithium ion battery and electrolyte thereof |
| CN102324568A (en) * | 2011-09-15 | 2012-01-18 | 诺莱特科技(苏州)有限公司 | Electrolyte solution for improving swelling of lithium ion battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779606A (en) * | 2013-12-19 | 2014-05-07 | 宁波维科电池股份有限公司 | Electrolyte of lithium ion battery and application of electrolyte |
| CN103779606B (en) * | 2013-12-19 | 2016-02-10 | 宁波维科电池股份有限公司 | A kind of electrolyte of lithium ion battery and application thereof |
| CN106030889A (en) * | 2014-02-25 | 2016-10-12 | 三菱化学株式会社 | Nonaqueous electrolyte solution and nonaqueous-electrolyte-solution secondary battery using same |
| CN104393331A (en) * | 2014-11-17 | 2015-03-04 | 云南锡业集团（控股）有限责任公司 | Lithium iron phosphate power battery and preparation method thereof |
| CN106450047A (en) * | 2016-10-17 | 2017-02-22 | 中盐安徽红四方锂电有限公司 | High-temperature lithium ion power battery and making method thereof |
| CN106654128A (en) * | 2017-01-18 | 2017-05-10 | 宁德新能源科技有限公司 | Secondary battery |
| CN106654128B (en) * | 2017-01-18 | 2021-01-26 | 宁德新能源科技有限公司 | Secondary battery |
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