CN108232299A - A kind of high-voltage electrolyte containing new additive agent - Google Patents
A kind of high-voltage electrolyte containing new additive agent Download PDFInfo
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- CN108232299A CN108232299A CN201711446243.8A CN201711446243A CN108232299A CN 108232299 A CN108232299 A CN 108232299A CN 201711446243 A CN201711446243 A CN 201711446243A CN 108232299 A CN108232299 A CN 108232299A
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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
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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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
- 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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Abstract
The invention discloses a kind of high-voltage electrolyte containing new additive agent, including following raw material：Lithium salts, organic solvent, additive A and additive B, organic solvent, additive A and additive B mass fraction proportioning are as follows：Organic solvent 85% 90%, additive A 2% 8%, additive B 5% 8%.This high-voltage electrolyte for containing new additive agent uses high pressure additive of the benzothiophene sulfone for containing element sulphur as lithium-ion electrolyte, improve cell interface impedance, improve lithium ion battery high-voltage performance, ethyl sulfate can effectively coat negative material, substantially improve the room temperature cycles performance under high voltage.
Description
Technical field
The present invention relates to technical field of lithium ion, specially a kind of high-voltage electrolyte containing new additive agent.
Background technology
Lithium ion battery has that operating voltage is high, specific capacity is big, have extended cycle life, memory-less effect and environmentally friendly
The advantages that, it is widely applied in the electronic products such as communication tool, laptop.As lithium ion battery is electronic
Application on automobile and hybrid-electric car, people propose more the energy density of lithium battery, especially mass energy density
High request；There are many kinds of the energy densities that mode improves battery at present, and the gram volume for improving positive electrode is a kind of effective way,
Wherein, at present most conventional methods be using the higher NCM of Ni contents as positive electrode, but it is current for nickelic ternary material
Material, especially NCM811, NCA current synthesis technology is not overripened, and its higher thermal stability of nickel content is poorer, influences electricity
The security performance of core, in addition, the electrochemical window for improving positive electrode also can effectively promote the gram volume of positive electrode, such as
NCM523 materials are in the electrochemical window of 2.7-4.2V, and capacity can reach 155mAh/g or so under the charging and discharging currents of 1C,
When electrochemical window increases to 4.2-4.4V, gram volume can increase to 175mAh/g or so under equal conditions；Limitation is high at present
Press Materials restraining factors it is main there are two, first be positive electrode in itself, the lithium under high voltage condition in positive electrode
Ion can largely be deviate from, and lead to electrode material structure collapses, influence battery safety and cyclical stability, but with anode material
The promotion of material cladding and doping techniques, material manufacturer can solve the problems, such as this very well.Second be electrolyte limitation, electrolyte
Especially more than 4.5V meetings oxygenolysis generates a large amount of gases under high pressure, and on the one hand corroding positive electrode leads to material gram volume
Decline, another aspect battery bulge serious threat the security performance of battery core, constrains high-voltage lithium ion batteries and further send out
Exhibition, therefore need a kind of high-voltage electrolyte containing new additive agent.
Invention content
The purpose of the present invention is to provide a kind of high-voltage electrolytes containing new additive agent, improve lithium ion battery
High-voltage performance substantially improves the room temperature cycles performance under high voltage, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical solution：A kind of high voltage electrolysis containing new additive agent
Liquid, including following raw material：Lithium salts, organic solvent, additive A and additive B, organic solvent, additive A and additive B quality
Score proportioning is as follows：Organic solvent 85%-90%, additive A 2%-8%, additive B 5%-8%.
Preferably, lithium salts for lithium hexafluoro phosphate, hexafluoroarsenate lithium, lithium perchlorate, LiBF4, dioxalic acid lithium borate,
In difluorine oxalic acid boracic acid lithium, pyrovinic acid lithium, trifluoromethyl sulfonic acid lithium, bis trifluoromethyl sulfimide lithium any one or
Several mixture therein, wherein lithium salt are 0.8-1.2M.
Preferably, organic solvent under protection of argon gas, is made non-aqueous organic molten by vacuum distillation purification and Silicagel dehydration
Agent, non-aqueous organic solvent mainly include esters solvent, amine solvent, any one or a few in sulfone class solvent and nitrile solvents
The mixture of composition.
Preferably, esters solvent mainly includes ethylene carbonate, propene carbonate, butylene, γ-butyrolactone, carbon
Sour dipropyl, dimethyl sulfite, vinylene carbonate, methyl propyl carbonate, ethyl acetate, methyl acetate, methyl butyrate, butyric acid
Ethyl ester, methyl propionate, ethyl propionate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and propyl acetate.
Preferably, amine solvent mainly includes N- methylacetamides, N-METHYLFORMAMIDE, dimethylformamide and two
Ethyl-formamide.
Preferably, sulfone class solvent mainly includes dimethyl sulfoxide (DMSO), sulfolane, diphenyl sulfoxide, thionyl chloride and dipropyl
Sulfone.
Preferably, nitrile solvents mainly include acetonitrile, succinonitrile, adiponitrile and glutaronitrile.
Preferably, additive A is benzothiophene derivative.
Preferably, additive B is ethyl sulfate.
Compared with prior art, the beneficial effects of the invention are as follows：
Two stupid bithiophene sulfone additive of methyl, Chloroethyl hexichol used by this high-voltage electrolyte containing new additive agent
Contain element sulphur in bithiophene sulfone additive or methyl carbonate benzothiophene sulfone additive, using the benzo thiophene containing element sulphur
High pressure additive of the fen sulfone as lithium-ion electrolyte has higher oxidizing potential, can protect cathode in cathode filming,
Reduce the generation of side reaction between cathode and electrolyte, so as to improve cell interface impedance, effectively improve lithium ion battery high pressure
Performance, secondly, ethyl sulfate have good cathode film formation performance, can effectively coat negative material, therefore can be significantly
Improve the room temperature cycles performance under high voltage.
Specific embodiment
The embodiment of the present invention is will be detailed below, however, the embodiment of the present invention is not limited thereto.Based in the present invention
Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work,
It shall fall within the protection scope of the present invention.
In the embodiment of the present invention：A kind of high-voltage electrolyte containing new additive agent, including following raw material：Lithium salts has
Solvent, additive A and additive B, organic solvent, additive A and additive B mass fraction proportioning are as follows：Organic solvent
85%-90%, additive A 2%-8%, additive B 5%-8%；The positive electrode active materials of lithium ion battery used are selected
LiNi0.6Co0.2Mn0.2O2, negative material selection Delanium and native graphite mixture, every battery electrolyte usage amount are
10-20g, the nominal capacity of every battery is 20Ah, selects what the high-voltage electrolyte containing different electrolytes additive assembled
Lithium ion battery selects the lithium ion battery that the conventional electrolysis liquid without electrolysis additive assembles as a comparison as embodiment
Example；
(the H in glove box2O ＜ 5ppm) prepare conventional electrolysis liquid be as follows：
One：Under nitrogen or inert gas shielding, by non-aqueous organic solvent molecular sieve dehydration, non-aqueous organic solvent is obtained；
Two：Appropriate lithium salts is added in non-aqueous organic solvent, obtains conventional electrolysis liquid 160g, loaded in fluorination bottle.
Embodiment one：
A kind of lithium ion battery high-voltage electrolyte and lithium ion battery, electrolyte include one kind and contain two stupid bithiophene of methyl
The additive of sulfone, structural formula are：
For high voltage additive when in for lithium-ion battery electrolytes, shared mass percent is 5% in the electrolytic solution, sulphur
The mass fraction of sour ethyl is 6%, the organic solvent in electrolyte is ethylene carbonate (EC), dimethyl carbonate (DMC) and
The mixture of methyl ethyl carbonate (EMC), the wherein mass ratio of ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate are 1：1：
1, the electrolyte of lithium ion battery is the LiPF of 1M6, it is denoted as electrolyte 1.
Comparative example one：
The electrolyte containing methyldibenzothiophene sulfone and ethyl sulfate additive is not added in embodiment one and is denoted as electrolyte
2。
Embodiment two：
A kind of lithium ion battery high-voltage electrolyte and lithium ion battery, electrolyte include a kind of Chloroethyl dibenzothiophenes
The additive of sulfone, structural formula are：
For high voltage additive when in for lithium-ion battery electrolytes, shared mass percent is 7% in the electrolytic solution, sulphur
The mass fraction of sour ethyl is 5%.Organic solvent in electrolyte is ethylene carbonate (EC), dimethyl carbonate (DMC) and
The mixture of methyl ethyl carbonate (EMC), the wherein mass ratio of ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate are 1： 1：
1, the electrolyte of lithium ion battery is respectively the LiBOB of 1.1M, is denoted as electrolyte 3.
Comparative example two：
The electrolyte containing Chloroethyl dibenzothiophene sulphone and ethyl sulfate additive is not added in embodiment two and is denoted as electricity
Solve liquid 4.
Embodiment three：
A kind of lithium ion battery high-voltage electrolyte and lithium ion battery, electrolyte include a kind of methyl carbonate benzothiophene sulfone
Additive, structural formula is：
For high voltage additive when in for lithium-ion battery electrolytes, shared mass percent is 5% in the electrolytic solution, sulphur
The mass fraction of sour ethyl is 8%.Organic solvent in electrolyte is ethylene carbonate (EC), dimethyl carbonate (DMC) and
The mixture of diethyl carbonate (DEC), the wherein mass ratio of ethylene carbonate, dimethyl carbonate and diethyl carbonate are 1：1：
1, the electrolyte of lithium ion battery is respectively the LiPF of 1.2M6, it is denoted as electrolyte 5.
Comparative example three：
The electrolyte containing methyl carbonate benzothiophene sulfone and ethyl sulfate additive is not added in embodiment three and is denoted as electrolysis
Liquid 6.
By lithium ion battery assembled in above-described embodiment under room temperature (25 DEG C), in 3-4.5 V voltage ranges under 1C
The chemical property of battery is tested, the results are shown in Table 1：
Table 1
| Electrolyte | Head effects（%） | Cycle-index | Capacity retention ratio（%） |
| 1 | 88.2 | 600 | 86.2 |
| 2 | 87.1 | 600 | 77.3 |
| 3 | 88.5 | 500 | 82.8 |
| 4 | 86.5 | 500 | 72.3 |
| 5 | 87.9 | 800 | 77.9 |
| 6 | 88.2 | 800 | 69.1 |
It can be obtained by comparing electrolyte 1 and electrolyte 2 in table 1, it is 1 that mass ratio is added in electrolyte 1 and electrolyte 2：1：1
Ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) mixture, electrolyte is 1M's
LiPF6, two stupid bithiophene sulfone additive of methyl and mass fraction that wherein the addition of electrolyte 1 mass percent is 5% are 6% sulphur
Sour ethyl is not added in electrolyte 2, and as shown in Table 1, when being imitated with headed by, the capacity of electrolyte 1 is higher by 1.1% than electrolyte 2,
After cycle 600 times, the holding capacity of electrolyte 1 is higher by 8.9% than electrolyte 2；
It can be obtained by comparing electrolyte 3 and electrolyte 4 in table 1, it is 1 that mass ratio is added in electrolyte 3 and electrolyte 4：1：1
Ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) mixture, electrolyte is 1.1M's
LiBOB, wherein electrolyte 3 add the Chloroethyl dibenzothiophene sulphone additive that mass percent is 7% and mass fraction is
5% ethyl sulfate is not added in electrolyte 4, and as shown in Table 1, when being imitated with headed by, the capacity of electrolyte 3 is higher than electrolyte 4
Go out 2%, after cycle 500 times, the holding capacity of electrolyte 3 is higher by 10.5% than electrolyte 4；
It can be obtained by comparing electrolyte 5 and electrolyte 6 in table 1, it is 1 that mass ratio is added in electrolyte 5 and electrolyte 6：1：1
Ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) mixture, electrolyte is 1.2M's
LiPF6, methyl carbonate benzothiophene sulfone additive and mass fraction that wherein the addition of electrolyte 5 mass percent is 5% are 8%
Ethyl sulfate, be not added in electrolyte 6, as shown in Table 1, when being imitated with headed by, the capacity of electrolyte 5 is lower than electrolyte 6
0.3%, after cycle 800 times, the holding capacity of electrolyte 5 is higher by 8.8% than electrolyte 6；
In summary：Two stupid bithiophene sulfone additive of methyl, chlorine used by this high-voltage electrolyte containing new additive agent
For element sulphur is contained in ethyl dibenzothiophene sulphone additive or methyl carbonate benzothiophene sulfone additive, as shown in Table 1, adopt
It, can with higher oxidizing potential by the use of the benzothiophene sulfone of element sulphur is contained as the high pressure additive of lithium-ion electrolyte
In cathode filming, cathode is protected, reduces the generation of side reaction between cathode and electrolyte, so as to improve cell interface impedance, has
Effect improves lithium ion battery high-voltage performance, and secondly, ethyl sulfate has good cathode film formation performance, can effectively coat negative
Pole material, therefore high voltage can be substantially improved（More than 4.5V）Under room temperature cycles performance.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of high-voltage electrolyte containing new additive agent, which is characterized in that including following raw material：Lithium salts, organic solvent,
Additive A and additive B, organic solvent, additive A and additive B mass fraction proportioning are as follows：Organic solvent 85%-90%, adds
Add agent A2%-8%, additive B 5%-8%.
A kind of 2. high-voltage electrolyte containing new additive agent according to claim 1, which is characterized in that the lithium salts
For lithium hexafluoro phosphate, hexafluoroarsenate lithium, lithium perchlorate, LiBF4, dioxalic acid lithium borate, difluorine oxalic acid boracic acid lithium, methyl
Any one in Sulfonic Lithium, trifluoromethyl sulfonic acid lithium, bis trifluoromethyl sulfimide lithium or several mixture therein,
Wherein lithium salt is 0.8-1.2M.
3. a kind of high-voltage electrolyte containing new additive agent according to claim 1, which is characterized in that described organic
Non-aqueous organic solvent is made under protection of argon gas, by vacuum distillation purification and Silicagel dehydration in solvent, and non-aqueous organic solvent is main
Including esters solvent, amine solvent, the mixture that any one or a few in sulfone class solvent and nitrile solvents forms.
A kind of 4. high-voltage electrolyte containing new additive agent according to claim 3, which is characterized in that the esters
Solvent mainly includes ethylene carbonate, propene carbonate, butylene, gamma-butyrolacton, dipropyl carbonate, sulfurous acid diformazan
Ester, vinylene carbonate, methyl propyl carbonate, ethyl acetate, methyl acetate, methyl butyrate, ethyl butyrate, methyl propionate, propionic acid
Ethyl ester, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and propyl acetate.
A kind of 5. high-voltage electrolyte containing new additive agent according to claim 3, which is characterized in that the amine
Solvent mainly includes N- methylacetamides, N-METHYLFORMAMIDE, dimethylformamide and diethylformamide.
A kind of 6. high-voltage electrolyte containing new additive agent according to claim 3, which is characterized in that the sulfone class
Solvent mainly includes dimethyl sulfoxide (DMSO), sulfolane, diphenyl sulfoxide, thionyl chloride and dipropyl sulfone.
A kind of 7. high-voltage electrolyte containing new additive agent according to claim 3, which is characterized in that the nitrile
Solvent mainly includes acetonitrile, succinonitrile, adiponitrile and glutaronitrile.
A kind of 8. high-voltage electrolyte containing new additive agent according to claim 1, it is characterised in that the addition
Agent A is benzothiophene derivative.
A kind of 9. high-voltage electrolyte containing new additive agent according to claim 1, which is characterized in that the addition
Agent B is ethyl sulfate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109053787A (en) * | 2018-09-18 | 2018-12-21 | 天津金牛电源材料有限责任公司 | A kind of preparation method of difluorine oxalic acid boracic acid lithium |
| CN109346763A (en) * | 2018-10-19 | 2019-02-15 | 惠州市豪鹏科技有限公司 | A kind of electrolyte and lithium ion battery |
| CN113937358A (en) * | 2021-09-29 | 2022-01-14 | 广东工业大学 | Lithium ion battery electrolyte additive, preparation method thereof and lithium battery electrolyte |
| CN114361596A (en) * | 2022-02-14 | 2022-04-15 | 费县威尚新能源技术中心 | Lithium ion battery electrolyte and lithium ion battery |
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| CN105609875A (en) * | 2015-12-25 | 2016-05-25 | 中南大学 | Electrolyte additive and high-voltage electrolyte containing same |
| CN105633465A (en) * | 2016-03-09 | 2016-06-01 | 华南师范大学 | Ethylene sulfate additive contained high-voltage functional electrolyte and preparation method and application therefor |
| CN105742691A (en) * | 2014-12-25 | 2016-07-06 | 丰田自动车株式会社 | Non-aqueous electrolyte secondary battery and a method for producing the same |
| CN106450461A (en) * | 2016-12-14 | 2017-02-22 | 东莞市凯欣电池材料有限公司 | Lithium secondary battery overcharge protection electrolyte and lithium secondary battery |
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| CN103730692A (en) * | 2013-07-18 | 2014-04-16 | 江西优锂新材股份有限公司 | Method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries |
| CN105742691A (en) * | 2014-12-25 | 2016-07-06 | 丰田自动车株式会社 | Non-aqueous electrolyte secondary battery and a method for producing the same |
| CN105609875A (en) * | 2015-12-25 | 2016-05-25 | 中南大学 | Electrolyte additive and high-voltage electrolyte containing same |
| CN105633465A (en) * | 2016-03-09 | 2016-06-01 | 华南师范大学 | Ethylene sulfate additive contained high-voltage functional electrolyte and preparation method and application therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109053787A (en) * | 2018-09-18 | 2018-12-21 | 天津金牛电源材料有限责任公司 | A kind of preparation method of difluorine oxalic acid boracic acid lithium |
| CN109346763A (en) * | 2018-10-19 | 2019-02-15 | 惠州市豪鹏科技有限公司 | A kind of electrolyte and lithium ion battery |
| CN109346763B (en) * | 2018-10-19 | 2021-01-05 | 惠州市豪鹏科技有限公司 | Electrolyte and lithium ion battery |
| CN113937358A (en) * | 2021-09-29 | 2022-01-14 | 广东工业大学 | Lithium ion battery electrolyte additive, preparation method thereof and lithium battery electrolyte |
| CN114361596A (en) * | 2022-02-14 | 2022-04-15 | 费县威尚新能源技术中心 | Lithium ion battery electrolyte and lithium ion battery |
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