CN100433441C - Lithium ion cell electrolyte and cell - Google Patents
Lithium ion cell electrolyte and cell Download PDFInfo
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- CN100433441C CN100433441C CNB2005100219490A CN200510021949A CN100433441C CN 100433441 C CN100433441 C CN 100433441C CN B2005100219490 A CNB2005100219490 A CN B2005100219490A CN 200510021949 A CN200510021949 A CN 200510021949A CN 100433441 C CN100433441 C CN 100433441C
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- Prior art keywords
- electrolyte
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- battery
- lithium
- carbonate
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 49
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 19
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003960 organic solvent Substances 0.000 claims abstract description 17
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 14
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 10
- 150000005686 dimethyl carbonates Chemical class 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 4
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 16
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 229910013870 LiPF 6 Inorganic materials 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000000694 effects Effects 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
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910012820 LiCoO Inorganic materials 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 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
- 239000003513 alkali Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 239000000463 material Substances 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
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910014689 LiMnO Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 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
- 239000007791 liquid phase 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
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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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- Secondary Cells (AREA)
Abstract
The invention relates to an electrolyte of lithium battery, which comprises electrolyte salt and organic solvent. Wherein, said organic solvent comprises dimethyl carbonate, diethyl carbonate, and ethylene carbonate, while their contents are 5-15, 55-65, and 25-35 deals. The invention also provides a relative lithium battery. And it has the advantages that based on the characters of different organic solvents; it combines the solvents, to find the best formula, to improve the capacity of battery.
Description
[technical field]
The present invention relates to materials chemistry field and high-energy battery technology, specifically relate to a kind of lithium-ion battery electrolytes and battery.
[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; The common electrolyte lithium salts has lithium perchlorate, lithium hexafluoro phosphate, LiBF4 etc., but considers that from cost, fail safe etc. are many-sided lithium hexafluoro phosphate is 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 plus-negative plate LiCoO that Japan Matsushita company produces
2/ Li-C, used electrolyte is LiPF
6/ EC (EthyleneCarbonate, ethylene carbonate)+DEC (Diethyl Carbonate, diethyl carbonate)+cosolvent; A﹠amp; The battery plus-negative plate that T Battery company produces is LiCoO
2/ Li-C, used electrolyte is LiBF
4/ PC (polyester Carbonate, Merlon)+EC+BLr-butyrolactone.Domestic the most frequently used electrolyte system has EC+DMC (Dimethyl Carbonate, dimethyl carbonate), EC+DEC, EC+DMC+EMC (Ethyl Methyl Carbonate, methyl ethyl carbonate), 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.Electrolyte consists of 1mol/l LiPF
6/ EC+DMC+DEC+EMC has better cycle life, cryogenic property and security performance than common electrolyte on performance, can effectively reduce gas and produce, and prevents cell expansion.The decomposition voltage of EC/DEC, EC/DMC electrolyte system is 4.25V, 5.10V.According to Bellcore research, LiPF
6/ EC+DMC and carbon negative pole have good compatibility, for example at LiC
6/ LiMnO
4In the battery, with LiPF
6/ EC+DMC is an electrolyte, can be stabilized to 4.9V under the room temperature, and 55 ℃ can be stabilized to 4.8V, and its liquid phase region is-20 ℃～130 ℃, and outstanding advantage is to use temperature range wide, and is good with the compatibility of carbon negative pole, and the safety index height has good cycle life and discharge performance.The battery plus-negative plate of domestic vast battery production manufacturers produce is LiCoO at present
2/ C, used electrolyte are 1mol/l LiPF6/EC+DMC+EMC, wherein EC: DMC: the EMC mass ratio is 1: 1: 1.Though this system has good safety performance and cycle life, but the performance of battery plus-negative plate active material specific capacity there is certain influence.
[summary of the invention]
The objective of the invention is to overcome the deficiency of present widely used electrolyte, propose a kind of lithium ion battery that can effectively bring into play the electrolyte of active material performance and contain this kind electrolyte.
In order to achieve the above object, the technical solution used in the present invention is: a kind of lithium-ion battery electrolytes, comprise electrolytic salt and organic solvent, described organic solvent comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate, wherein the weight content of each composition is, 5～15 parts of dimethyl carbonates, 55～65 parts of methyl ethyl carbonates, 25～35 parts of ethylene carbonates.
Preferably, described organic solvent is made up of dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate.
Preferably, the weight content of described each composition is 10 parts of dimethyl carbonates, 60 parts of methyl ethyl carbonates, 30 parts of ethylene carbonates.
The present invention also provides the lithium ion battery that contains above-mentioned electrolyte.
Used EC is a kind of more special material in the such scheme, and normal temperature is clear crystal, its density 1.41g/cm down
3, 37 ℃ of fusing points, 248 ℃ of boiling points, 160 ℃ of flash-points are dissolved in ethanol, water etc., and stable performance can be decomposed under the alkali condition, generates DMC and ethylene glycol with methyl alcohol generation ester exchange reaction.EC does not decompose on the graphite cathode surface, is one of basic components of lithium-ion battery electrolytes.
DMC, normal temperature are colourless liquid, density 1.07g/cm down
3, 4 ℃ of fusing points, 90.1 ℃ of boiling points, 18 ℃ of flash-points, flammable.
EMC, density 1.00g/cm
3, fusing point-55 ℃, 109 ℃ of boiling points, 23 ℃ of flash-points, with respect to DEC, DMC etc., poor heat stability is heated or ester exchange reaction takes place down alkali condition easily, generates DEC and DMC.
Compared with prior art, in conjunction with the following embodiment that will describe in detail, beneficial technical effects of the present invention is: at the materialization characteristics separately of different organic solvents, solvent is made up, find and wherein can bring into play separately advantage and can restrain the proportioning of shortcoming separately mutually again, make active material bring into play the specific capacity performance performance of its optimum chemical property, particularly active material, thereby improve battery capacity.
[embodiment]
Below further understand the present invention by some illustrative embodiment.For the purpose of clear and definite, the intercell of being mentioned in following embodiment and Comparative Examples all refers to the battery with a collection of same model (393048S), 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.
Embodiment 1
The weight proportion of organic solvent is in the electrolyte: DMC is 5 parts, and EMC is 65 parts, and EC is 30 parts
With 5gDMC, 65gEMC and 30gEC evenly mix in closed environment, add 0.091molLiPF then
6Fully mix.30 of arbitrary extractings are the 393048S battery of fluid injection not, in glove box with 30 not the battery of fluid injection inject the electrolyte of a certain amount of above-mentioned configuration respectively, then will be fluid injection cell degradation, change into, seal, measure its capacity at last, average discharge capacity is 547.8mah.
Embodiment 2
The weight proportion of organic solvent is in the electrolyte: DMC is 15 parts, and EMC is 60 parts, and EC is 25 parts
With 15gDMC, 60gEMC and 25gEC evenly mix in closed environment, add 0.092molLiPF6 then and fully mix.30 of arbitrary extractings are the 393048S battery of fluid injection not, in glove box with 30 not the battery of fluid injection inject the electrolyte of a certain amount of above-mentioned configuration respectively, then will be fluid injection cell degradation, change into, seal, measure its capacity at last, average discharge capacity is 548.6mah.
Embodiment 3
The weight proportion of organic solvent is in the electrolyte: DMC is 10 parts, and EMC is 55 parts, and EC is 35 parts
With 10gDMC, 55gEMC and 35gEC evenly mix in closed environment, add 0.089molLiPF6 then and fully mix.30 of arbitrary extractings are the 393048S battery of fluid injection not, in glove box with 30 not the battery of fluid injection inject the electrolyte of a certain amount of above-mentioned configuration respectively, then will be fluid injection cell degradation, change into, seal, measure its capacity at last, average discharge capacity is 549.1mah.
Embodiment 4
The weight proportion of organic solvent is in the electrolyte: DMC is 10 parts, and EMC is 60 parts, and EC is 30 parts
With 10gDMC, 60gEMC and 30gEC evenly mix in closed environment, add 0.090molLiPF6 then and fully mix.30 of arbitrary extractings are the 393048S battery of fluid injection not, in glove box with 30 not the battery of fluid injection inject the electrolyte of a certain amount of above-mentioned configuration respectively, then will be fluid injection cell degradation, change into, seal, measure its capacity at last, average discharge capacity is 549.5mah.
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
With 33.3gDMC, 33.3gEMC and 33.3gEC evenly mix in closed environment, add 0.088mol LiPF6 then and fully mix.30 of arbitrary extractings are the 393048S battery of fluid injection not, in glove box with 30 not the battery of fluid injection inject the electrolyte of a certain amount of above-mentioned configuration respectively, then will be fluid injection cell degradation, change into, seal, measure its capacity at last, average discharge capacity is 538.4mah.
By above embodiment, as can be seen, adopt electrolyte provided by the invention that the capacity raising of battery is had effect preferably.With 393048S is example, and using electrolyte provided by the invention than the proportioning of using present extensive use is that the battery capacity of 1: 1: 1 electrolyte will improve about 10 mah, and corresponding production cost does not improve, and is worthy of popularization.
Claims (4)
1, a kind of lithium-ion battery electrolytes, comprise electrolytic salt and organic solvent, it is characterized in that: described organic solvent comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate, wherein the weight content of each composition is: 5～15 parts of dimethyl carbonates, 55～65 parts of methyl ethyl carbonates, 25～35 parts of ethylene carbonates.
2, lithium-ion battery electrolytes according to claim 1 is characterized in that: described organic solvent is made up of dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate.
3, lithium-ion battery electrolytes according to claim 1 and 2 is characterized in that: the weight content of described each composition is 10 parts of dimethyl carbonates, 60 parts of methyl ethyl carbonates, 30 parts of ethylene carbonates.
4, a kind of lithium ion battery is characterized in that: contain above-mentioned any described electrolyte of claim.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100219490A CN100433441C (en) | 2005-10-21 | 2005-10-21 | Lithium ion cell electrolyte and cell |
| HK07110197.3A HK1102157A1 (en) | 2005-10-21 | 2007-09-19 | The electrolyte of li-on battery and the battery with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100219490A CN100433441C (en) | 2005-10-21 | 2005-10-21 | Lithium ion cell electrolyte and cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1953266A CN1953266A (en) | 2007-04-25 |
| CN100433441C true CN100433441C (en) | 2008-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100219490A Active CN100433441C (en) | 2005-10-21 | 2005-10-21 | Lithium ion cell electrolyte and cell |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100433441C (en) |
| HK (1) | HK1102157A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315478B (en) * | 2010-06-29 | 2015-05-27 | 深圳市比克电池有限公司 | Lithium ion battery system and method for improving low-temperature discharge performance of lithium ion battery |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0745304A (en) * | 1993-08-02 | 1995-02-14 | Japan Storage Battery Co Ltd | Organic electrolyte secondary battery |
| JP2000251934A (en) * | 1999-03-02 | 2000-09-14 | Osaka Gas Co Ltd | Organic electrolyte battery for power storage system |
| CN1532986A (en) * | 2003-03-24 | 2004-09-29 | ����Sdi��ʽ���� | Non aqueous electrolyte and lithium secondary cell using it |
| JP2004342626A (en) * | 2004-08-05 | 2004-12-02 | Sumitomo Chem Co Ltd | Method for enhancing low temperature discharge characteristics of nonaqueous electrolyte lithium secondary battery |
| JP2005259708A (en) * | 2005-04-13 | 2005-09-22 | Ube Ind Ltd | Nonaqueous secondary battery |
-
2005
- 2005-10-21 CN CNB2005100219490A patent/CN100433441C/en active Active
-
2007
- 2007-09-19 HK HK07110197.3A patent/HK1102157A1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0745304A (en) * | 1993-08-02 | 1995-02-14 | Japan Storage Battery Co Ltd | Organic electrolyte secondary battery |
| JP2000251934A (en) * | 1999-03-02 | 2000-09-14 | Osaka Gas Co Ltd | Organic electrolyte battery for power storage system |
| CN1532986A (en) * | 2003-03-24 | 2004-09-29 | ����Sdi��ʽ���� | Non aqueous electrolyte and lithium secondary cell using it |
| JP2004342626A (en) * | 2004-08-05 | 2004-12-02 | Sumitomo Chem Co Ltd | Method for enhancing low temperature discharge characteristics of nonaqueous electrolyte lithium secondary battery |
| JP2005259708A (en) * | 2005-04-13 | 2005-09-22 | Ube Ind Ltd | Nonaqueous secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1953266A (en) | 2007-04-25 |
| HK1102157A1 (en) | 2007-11-09 |
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