CN101090153A - Lithium ion battery electrolyte and lithium ion battery - Google Patents
Lithium ion battery electrolyte and lithium ion battery Download PDFInfo
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- CN101090153A CN101090153A CN 200610021194 CN200610021194A CN101090153A CN 101090153 A CN101090153 A CN 101090153A CN 200610021194 CN200610021194 CN 200610021194 CN 200610021194 A CN200610021194 A CN 200610021194A CN 101090153 A CN101090153 A CN 101090153A
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- Prior art keywords
- ion battery
- electrolyte
- carbonate
- parts
- lithium
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 58
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 28
- 239000003960 organic solvent Substances 0.000 claims abstract description 23
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 28
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 14
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 5
- 150000005686 dimethyl carbonates Chemical class 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 1
- 150000002148 esters Chemical class 0.000 abstract 1
- -1 methyl-ester carbonate Chemical class 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 13
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 229910013872 LiPF Inorganic materials 0.000 description 12
- 101150058243 Lipf gene Proteins 0.000 description 12
- 230000004087 circulation Effects 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 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 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- 229910008293 Li—C Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- Y02E60/12—
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- Secondary Cells (AREA)
Abstract
This invention discloses an electrolyte of Li ionic cells including electrolyte salt and organic solvent, in which, the organic solvent includes the weight portions of ethene ester carbonate: 25-50, methyl-ester carbonate: 30-60, methyl ethyl carbonate: 5-25 and PC: 1-15. This invention also discloses a Li ionic cell containing said electrolyte.
Description
Technical field
The present invention relates to the high-energy battery field, particularly relate to a kind of electrolyte of lithium ion battery and contain the lithium ion battery of this electrolyte.
Background technology
Lithium-ion battery electrolytes is the important component part of battery, is bearing the effect of transmission charge between the both positive and negative polarity in battery, and it is most important to specific capacity, operating temperature range, cycle efficieny and the security performance etc. of battery.Lithium-ion battery electrolytes generally is made up of high-purity organic solvent, electrolyte lithium salt and necessary additive.
Organic solvent is the main part of electrolyte, and is closely related with the performance of electrolyte, generally mixes use with low viscosity solvent by high dielectric constant solvent.Organic solvent commonly used has:
EC (Ethylene Carbonate, ethylene carbonate)
PC (polyester Carbonate, Merlon)
DEC (Diethyl Carbonate, diethyl carbonate)
DMC (Dimethyl Carbonate, dimethyl carbonate)
EMC (Ethyl Methyl Carbonate, methyl ethyl carbonate)
The common electrolyte lithium salts has lithium perchlorate, lithium hexafluoro phosphate, LiBF4 etc., but considers lithium hexafluoro phosphate (LiPF from cost, fail safe etc. are many-sided
6) be the main electrolyte that the commercialization lithium ion battery adopts;
The use of additive is not commercialization as yet, but is one of research focus of organic electrolyte always.
Succeed in developing from lithium-ion electrolyte in 1991, lithium ion battery has entered electronics and IT products markets such as notebook computer, mobile phone very soon, and dominate progressively.During the lithium-ion battery electrolytes product technology also is in and further develops at present.Aspect lithium-ion battery electrolytes research and production, be engaged in the development of lithium ion battery special electrolysis liquid and the company of exploitation in the world and mainly concentrate on countries such as Japan, Germany, Korea S, the U.S., Canada, electrolyte with Japan is with fastest developing speed, market share maximum.The battery that Japan Matsushita company produces, both positive and negative polarity LiCoO
2/ Li-C, used electrolyte is LiPF
6/ EC+DEC+ cosolvent; A﹠amp; The battery that T Battery company produces, both positive and negative polarity is LiCoO
2/ Li-C, used electrolyte is LiBF
4/ PC+EC+BLr-butyrolactone.Domestic common electrolyte system has EC+DMC, EC+DEC, EC+DMC+EMC, EC+DMC+DEC etc.The service condition difference of different electrolyte, different with the compatibility of battery plus-negative plate, decomposition voltage is also different.
At present the battery of domestic vast battery production manufacturers produce the both positive and negative polarity of extensive employing be LiCoO
2/ C, electrolyte are LiPF
6/ EC+DMC+EMC, wherein EC: DMC: the EMC mass ratio is 1: 1: 1.Though this system has good safety performance and the performance of active material capacity, cycle performance is not ideal enough, remains further to be improved.
Summary of the invention
The objective of the invention is at the problems of the prior art, a kind of lithium ion battery that can improve the lithium-ion battery electrolytes of cycle performance of battery and contain this kind electrolyte is provided.
For achieving the above object, the present invention has adopted following technical scheme:
The invention discloses a kind of lithium-ion battery electrolytes, contain electrolytic salt and organic solvent, described organic solvent comprises 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon, the described weight portion that is.
Further, described organic solvent is made up of 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon.
Preferably, described ethylene carbonate 30-40 part, dimethyl carbonate 40-50 part, methyl ethyl carbonate 10-20 part, Merlon 3-10 part.
Further preferred, 35 parts of described ethylene carbonates, 45 parts of dimethyl carbonates, 15 parts of methyl ethyl carbonates, 5 parts of Merlon.
Described electrolytic salt is LiPF
6, its concentration in electrolyte is 1mol/L.
The invention also discloses the lithium ion battery that contains above-mentioned electrolyte.
Because adopted above scheme, the beneficial effect that the present invention is possessed is:
Electrolyte of the present invention by selecting particular types organic solvent and make and meet specific proportioning between each organic solvent, the advantage of each organic solvent can be given full play to and separately shortcoming can be suppressed mutually, make the optimum chemical property of electrolyte performance, particularly cycle performance improves; After testing, by the battery of electrolyte preparation of the present invention, capability retention can reach 90% after 400 circulations.
Embodiment
Below further understand the present invention by specific embodiment.For ease of comparing, the intercell of being mentioned in following embodiment and Comparative Examples all refers to the battery with a collection of same model (053048S), saidly be meant that with a collection of the preorder production technology of this batch battery is all the same, and unique different be the electrolyte difference of injecting in the fluid injection operation.In this size battery, negative pole is a graphite, just very cobalt acid lithium.
Embodiment 1
The weight proportion of organic solvent is in the electrolyte: EC is 25 parts, and DMC is 60 parts, and EM C is 5 parts, and PC is 15 parts.
The preparation of electrolyte: in closed environment, 25 gram EC, 60 gram DMC, 5 gram EMC and 15 gram PC are evenly mixed, add LiPF then
6Fully mix, make it to form the LiPF of 1mol/L
6Solution.
Randomly draw 30 not 053048S batteries of fluid injection, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, the battery of fluid injection wears out, changes into, seals according to a conventional method, detect then, record that average capability retention is 78% after 400 circulations.
Embodiment 2
The weight proportion of organic solvent is in the electrolyte: EC is 50 parts, and DMC is 30 parts, and EM C is 25 parts, and PC is 1 part.
The preparation of electrolyte: in closed environment, 50 gram EC, 30 gram DMC, 25 gram EMC and 1 gram PC are evenly mixed, add LiPF then
6Fully mix, make it to form the LiPF of 1mol/L
6Solution.
Randomly draw 30 not 053048S batteries of fluid injection, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, according to a conventional method will be fluid injection cell degradation, change into, seal, detect then, record that average capability retention is 77% after 400 circulations.
Embodiment 3
The weight proportion of organic solvent is in the electrolyte: EC is 30 parts, and DMC is 50 parts, and EM C is 20 parts, and PC is 3 parts.
The preparation of electrolyte: in closed environment, 30 gram EC, 50 gram DMC, 20 gram EMC and 3 gram PC are evenly mixed, add LiPF then
6Fully mix, make it to form the LiPF of 1mol/L
6Solution.
Randomly draw 30 not 053048S batteries of fluid injection, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, according to a conventional method will be fluid injection cell degradation, change into, seal, detect then, record that average capability retention is 85% after 400 circulations.
Embodiment 4
The weight proportion of organic solvent is in the electrolyte: EC is 40 parts, and DMC is 40 parts, and EM C is 10 parts, and PC is 10 parts.
The preparation of electrolyte: in closed environment, 40 gram EC, 40 gram DMC, 10 gram EMC and 10 gram PC are evenly mixed, add LiPF then
6Fully mix, make it to form the LiPF of 1mol/L
6Solution.
Get 30 not 053048S batteries of fluid injection at random, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, according to a conventional method will be fluid injection cell degradation, change into, seal, detect then, record that average capability retention is 88% after 400 circulations.
Embodiment 5
The weight proportion of organic solvent is in the electrolyte: EC is 35 parts, and DMC is 45 parts, and EM C is 15 parts, and PC is 5 parts.
The preparation of electrolyte: in closed environment, 35 gram EC, 45 gram DMC, 15 gram EMC and 5 gram PC are evenly mixed, add LiPF then
6Fully mix, make it to form the LiPF of 1mol/L
6Solution.
Randomly draw 30 not 053048S batteries of fluid injection, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, according to a conventional method will be fluid injection cell degradation, change into, seal, detect then, record that average capability retention is 90% after 400 circulations.
Comparative Examples
The weight proportion of organic solvent is in the electrolyte: DMC is 33.3 parts, and EMC is 33.3 parts, and EC is 33.3 parts
The preparation of electrolyte: with 33.3mlDMC, 33.3mlEMC and 33.3mlEC evenly mix in closed environment, add 0.088mol LiPF then
6Fully mix.
30 of arbitrary extractings are the 053048S battery of fluid injection not, in glove box with these 30 not intercell inject the electrolyte of above-mentioned configuration respectively, according to a conventional method will be fluid injection cell degradation, change into, seal, detect then, record that average capability retention is 76% after 400 circulations.
By above embodiment, be not difficult to find out, adopt electrolyte provided by the invention that the cycle performance raising of battery is had effect preferably, and corresponding production cost does not improve, and is worthy of popularization.
Claims (10)
1, a kind of lithium-ion battery electrolytes, contain electrolytic salt and organic solvent, it is characterized in that: described organic solvent comprises 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon, the described weight portion that is.
2, a kind of lithium-ion battery electrolytes according to claim 1 is characterized in that: described organic solvent is made up of 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon.
3, a kind of lithium-ion battery electrolytes according to claim 1 and 2 is characterized in that: described ethylene carbonate 30-40 part, dimethyl carbonate 40-50 part, methyl ethyl carbonate 10-20 part, Merlon 3-10 part.
4, a kind of lithium-ion battery electrolytes according to claim 3 is characterized in that: 35 parts of described ethylene carbonates, 45 parts of dimethyl carbonates, 15 parts of methyl ethyl carbonates, 5 parts of Merlon.
5, according to any described a kind of lithium-ion battery electrolytes in the claim 1,2,4, it is characterized in that: described electrolytic salt is LiPF
6, concentration is 1mol/L.
6, a kind of lithium ion battery, comprise electrolyte, described electrolyte contains electrolytic salt and organic solvent, it is characterized in that: described organic solvent comprises 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon, the described weight portion that is.
7, a kind of lithium ion battery according to claim 6 is characterized in that: described organic solvent is made up of 25-50 part ethylene carbonate, 30-60 part dimethyl carbonate, 5-25 part methyl ethyl carbonate and 1-15 part Merlon.
8, according to claim 6 or 7 described a kind of lithium ion batteries, it is characterized in that: described ethylene carbonate 30-40 part, dimethyl carbonate 40-50 part, methyl ethyl carbonate 10-20 part, Merlon 3-10 part.
9, a kind of lithium ion battery according to claim 8 is characterized in that: 35 parts of described ethylene carbonates, 45 parts of dimethyl carbonates, 15 parts of methyl ethyl carbonates, 5 parts of Merlon.
10, according to any described a kind of lithium ion battery in the claim 6,7,9, it is characterized in that: described electrolytic salt is LiPF
6, concentration is 1mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021194 CN101090153A (en) | 2006-06-12 | 2006-06-12 | Lithium ion battery electrolyte and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021194 CN101090153A (en) | 2006-06-12 | 2006-06-12 | Lithium ion battery electrolyte and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN101090153A true CN101090153A (en) | 2007-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610021194 Pending CN101090153A (en) | 2006-06-12 | 2006-06-12 | Lithium ion battery electrolyte and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103125042A (en) * | 2010-10-05 | 2013-05-29 | 新神户电机株式会社 | Lithium-ion battery |
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2006
- 2006-06-12 CN CN 200610021194 patent/CN101090153A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103125042A (en) * | 2010-10-05 | 2013-05-29 | 新神户电机株式会社 | Lithium-ion battery |
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