CN107634265A - A kind of high pressure resistant lithium-ion battery electrolytes - Google Patents
A kind of high pressure resistant lithium-ion battery electrolytes Download PDFInfo
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- CN107634265A CN107634265A CN201610564126.0A CN201610564126A CN107634265A CN 107634265 A CN107634265 A CN 107634265A CN 201610564126 A CN201610564126 A CN 201610564126A CN 107634265 A CN107634265 A CN 107634265A
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- lithium
- ion battery
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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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Abstract
The present invention relates to field of lithium ion battery, discloses a kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive；The organic solvent is the mixture of carbonate-based solvent and 3 propyl group nitrile trimethoxy Ethoxysilanes, and the 3 propyl group nitrile trimethoxy Ethoxysilane occupies the 20 50% of solvent cumulative volume.The electrolyte of the present invention, can effectively solve the problem that the technical problem for the oxidation Decomposition that existing electrolyte is tied up under high pressure, high temperature, it is possible to increase circulating battery stability, while there is higher high rate performance and high safety performance.
Description
Technical field
The present invention relates to field of lithium ion battery, more particularly to a kind of high pressure resistant lithium-ion battery electrolytes.
Background technology
Lithium ion battery is due to possessing operating voltage height, memory-less effect, have extended cycle life the advantage such as low with self discharge,
The fields such as electronic energy product, electric tool and electric automobile have a wide range of applications.In recent years, due to intelligent, shifting
The development of dynamicization and high power consumption electronic equipment, people require to improve the energy density of lithium ion battery, raising lithium-ion electric in a hurry
The operating voltage in pond is to improve one of lithium ion battery energy density effective way.
High-voltage anode material of the operating voltage in 4.35-5.0V has been obtained in the market；But existing electrolyte exists
Carry out that oxidation Decomposition can occur during discharge and recharge under 4.35-5.0V high pressures section, so as to cause the serious evil of battery performance
Change.In addition, there is huge safety in the high energy density cells that the inflammable and effumability of alkylcarbonic acid esters organic solvent makes
Hidden danger.This just causes the exploitation of novel high-pressure material to be restricted because lacking stable high-voltage electrolyte.
Therefore, the performance of existing carbonate group electrolyte is lifted, develops the high voltage type matched with high-voltage anode material
Electrolyte is one of key issue in the urgent need to address.Exploitation at present tends to optimize the composition of solvent and added suitably add
Add agent, so as to improve electrolyte resistance to oxidation, resistance to elevated temperatures under high pressure.
The Chinese patent of Application No. 201310276370.3 discloses a kind of high voltage electrolyte of lithium ion battery, and it is by having
Solvent, electrolyte lithium salt and cathode film formation additive composition, wherein, organic solvent is fluorinated ethylene carbonate, three fluoro carbon
The mixed solvent of acid propylene ester and hydrofluoroether composition, the electrolyte lithium salt are that lithium hexafluoro phosphate and di-oxalate lithium borate form
Mix lithium salts.But foregoing invention solution is that fluorinated solvents viscosity is high and electrolyte lithium salt dissolves in fluorinated organic solvent
Property difference the problem of, can not solve the problems, such as the present invention relevant art.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of high pressure resistant lithium-ion battery electrolytes.The present invention's
Electrolyte, it can effectively solve the problem that the technical problem for the oxidation Decomposition that existing electrolyte is tied up under high pressure, high temperature, it is possible to increase electricity
Pond cyclical stability, while there is higher high rate performance and high safety performance.
The present invention concrete technical scheme be：A kind of high pressure resistant lithium-ion battery electrolytes, including it is electrolyte lithium salt, organic
Solvent and additive；The organic solvent is carbonate-based solvent and 3- propyl group nitrile-trimethoxy Ethoxysilane
（CNCH2CH2CH2Si(OCH2CH2OCH3)3）Mixture, the 3- propyl group nitrile-trimethoxy Ethoxysilane occupies solvent
The 20-50% of cumulative volume.
3- propyl group nitrile-trimethoxy Ethoxysilane has high dielectric constant and anti-oxidant current potential, in the skill of the present invention
In art scheme, the cosolvent as electrolyte organic solvent adds the oxidation resistance that can increase electrolyte, effectively inhibits altogether
Dissolvent electrolytic solution slow down the growth of electrode polarization in cyclic process, reduce electrode/electrolyte circle in the decomposition of positive electrode surface
The Li in face+Diffusional resistance and charge transfer resistance, so as to improve circulating battery stability and forthright again.3- propyl group nitrile-three simultaneously
Methoxy-ethoxy-silane has low flame properties, can greatly improve the security performance of battery.In addition match somebody with somebody with the carbonic ester of low viscosity
Close, Li can be improved+Migration rate in cosolvent electrolyte.
Therefore, the electrolyte containing 3- propyl group nitrile-trimethoxy Ethoxysilane has excellent heat endurance and low temperature
The advantages that ionic conduction performance, high conductivity, nontoxicity, low combustible and high de-agglomeration voltage, have compared with carbon-based analog
Higher electrochemical stability（More than 4.5V）More than, also show excellent discharge and recharge using the lithium battery of electrolyte of the present invention
Cycle performance, high-energy-density, higher power density and high security.
Preferably, the carbonate-based solvent includes EC, DMC, DEC；And in the organic solvent each composition volume
Percentage is：EC accounts for 10-20%, and DMC accounts for 20-30%, and DEC accounts for 20-40%, and 3- propyl group nitrile-trimethoxy Ethoxysilane accounts for 20-
50%。
Preferably, the percent by volume of each composition is in the organic solvent：EC, which accounts for 15%, DMC and accounts for 25%, DEC, to be accounted for
30%, 3- propyl group nitrile-trimethoxy Ethoxysilane account for 30%.
Preferably, the electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium.
Difluorine oxalic acid boracic acid lithium adds as electrolyte lithium salt, can effectively suppress the production of moisture in electrolyte at high temperature
Raw, so as to reduce HF content, difluorine oxalic acid boracic acid lithium has preferable filming performance, and stable SEI films can be formed with negative pole；
In addition, in the present invention, difluorine oxalic acid boracic acid lithium can improve 3- propyl group nitrile-trimethoxy Ethoxysilane and graphite cathode
Compatibility.
Preferably, the concentration of the lithium hexafluoro phosphate is 0.8-1.1mol/L, the concentration of the difluorine oxalic acid boracic acid lithium
For 0.1-0.2mol/L.
Preferably, the additive includes propylene sulfite, succinonitrile, vinylene carbonate.By above-mentioned additive
Compounded with other components of electrolyte of the present invention, also there is particularly preferred oxidation resistance even if electrolyte at high temperature under high pressure,
Make battery that there is stable performance and security.
Preferably, the concentration of the propylene sulfite is 0.9-1.1wt%, the concentration of the succinonitrile is 0.4-
0.6wt%, the concentration of the vinylene carbonate is 0.9-1.1wt%.
Preferably, the concentration of the propylene sulfite is 1wt%, the concentration of the succinonitrile is 0.5wt%, the carbon
The concentration of sour vinylene is 1wt%.
It is compared with the prior art, the beneficial effects of the invention are as follows：Under specific electrolyte prescription of the invention, each component association
Same-action, it can effectively solve the problem that the technical problem for the oxidation Decomposition that existing electrolyte is tied up under high pressure, high temperature, it is possible to increase electricity
Pond cyclical stability, while there is higher high rate performance and high safety performance.
Embodiment
With reference to embodiment, the invention will be further described.
Embodiment 1
A kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive.
The percent by volume of each composition is in the organic solvent：EC, which accounts for 15%, DMC and accounts for 25%, DEC, accounts for 30%, 3- propyl group
Nitrile-trimethoxy Ethoxysilane accounts for 30%.
The electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium, and the concentration of lithium hexafluoro phosphate
For 0.95mol/L, the concentration of difluorine oxalic acid boracic acid lithium is 0.15mol/L.
The additive includes propylene sulfite, succinonitrile, vinylene carbonate.The concentration of propylene sulfite is
1wt%, the concentration of the succinonitrile is 0.5wt%, and the concentration of the vinylene carbonate is 1wt%.
Embodiment 2
A kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive.
The percent by volume of each composition is in the organic solvent：EC, which accounts for 15%, DMC and accounts for 20%, DEC, accounts for 30%, 3- propyl group
Nitrile-trimethoxy Ethoxysilane accounts for 35%.
The electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium, and the concentration of lithium hexafluoro phosphate
For 0.8mol/L, the concentration of difluorine oxalic acid boracic acid lithium is 0.1mol/L.
The additive includes propylene sulfite, succinonitrile, vinylene carbonate.The concentration of propylene sulfite is
0.9wt%, the concentration of the succinonitrile is 0.4wt%, and the concentration of the vinylene carbonate is 0.9wt%.
Embodiment 3
A kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive.
The percent by volume of each composition is in the organic solvent：EC, which accounts for 10%, DMC and accounts for 30%, DEC, accounts for 20%, 3- propyl group
Nitrile-trimethoxy Ethoxysilane accounts for 40%.
The electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium, and the concentration of lithium hexafluoro phosphate
For 1.1mol/L, the concentration of difluorine oxalic acid boracic acid lithium is 0.2mol/L.
The additive includes propylene sulfite, succinonitrile, vinylene carbonate.The concentration of propylene sulfite is
1.1wt%, the concentration of the succinonitrile is 0.6wt%, and the concentration of the vinylene carbonate is 1.1wt%.
Embodiment 4
A kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive.
The percent by volume of each composition is in the organic solvent：EC, which accounts for 20%, DMC and accounts for 20%, DEC, accounts for 40%, 3- propyl group
Nitrile-trimethoxy Ethoxysilane accounts for 20%.
The electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium, and the concentration of lithium hexafluoro phosphate
For 0.9mol/L, the concentration of difluorine oxalic acid boracic acid lithium is 0.15mol/L.
The additive includes propylene sulfite, succinonitrile, vinylene carbonate.The concentration of propylene sulfite is
1wt%, the concentration of the succinonitrile is 0.5wt%, and the concentration of the vinylene carbonate is 1wt%.
Embodiment 5
A kind of high pressure resistant lithium-ion battery electrolytes, including electrolyte lithium salt, organic solvent and additive.
The percent by volume of each composition is in the organic solvent：EC, which accounts for 10%, DMC and accounts for 20%, DEC, accounts for 20%, 3- propyl group
Nitrile-trimethoxy Ethoxysilane accounts for 50%.
The electrolyte lithium salt is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium, and the concentration of lithium hexafluoro phosphate
For 1 mol/L, the concentration of difluorine oxalic acid boracic acid lithium is 0.15mol/L.
The additive includes propylene sulfite, succinonitrile, vinylene carbonate.The concentration of propylene sulfite is
1wt%, the concentration of the succinonitrile is 0.5wt%, and the concentration of the vinylene carbonate is 1wt%.
Above-mentioned 3- propyl group nitrile-trimethoxy Ethoxysilane can be synthesized voluntarily, also can be by central glass
Co., LTD companies provide.
Raw materials used in the present invention, equipment, it is the conventional raw material, equipment of this area unless otherwise noted；In the present invention
Method therefor, it is the conventional method of this area unless otherwise noted.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and the equivalent transformation that technical spirit is made to above example, still fall within the technology of the present invention side
The protection domain of case.
Claims (8)
- A kind of 1. high pressure resistant lithium-ion battery electrolytes, it is characterised in that：Including electrolyte lithium salt, organic solvent and additive； The organic solvent is the mixture of carbonate-based solvent and 3- propyl group nitrile-trimethoxy Ethoxysilane, the 3- propyl group nitrile- Trimethoxy Ethoxysilane occupies the 20-50% of solvent cumulative volume.
- A kind of 2. high pressure resistant lithium-ion battery electrolytes as claimed in claim 1, it is characterised in that the carbonate-based solvent Including EC, DMC, DEC；And the percent by volume of each composition is in the organic solvent：EC accounts for 10-20%, and DMC accounts for 20-30%, DEC accounts for 20-40%, and 3- propyl group nitrile-trimethoxy Ethoxysilane accounts for 20-50%.
- 3. a kind of high pressure resistant lithium-ion battery electrolytes as claimed in claim 2, it is characterised in that each in the organic solvent The percent by volume of composition is：EC, which accounts for 15%, DMC and accounts for 25%, DEC and account for 30%, 3- propyl group nitrile-trimethoxy Ethoxysilane, to be accounted for 30%。
- A kind of 4. high pressure resistant lithium-ion battery electrolytes as described in claim 1-3 is any, it is characterised in that the electrolyte Lithium salts is the mixture of lithium hexafluoro phosphate and difluorine oxalic acid boracic acid lithium.
- 5. a kind of high pressure resistant lithium-ion battery electrolytes as claimed in claim 4, it is characterised in that the lithium hexafluoro phosphate Concentration is 0.8-1.1mol/L, and the concentration of the difluorine oxalic acid boracic acid lithium is 0.1-0.2mol/L.
- 6. a kind of high pressure resistant lithium-ion battery electrolytes as claimed in claim 1, it is characterised in that the additive includes Asia Sulfuric acid propylene, succinonitrile, vinylene carbonate.
- A kind of 7. high pressure resistant lithium-ion battery electrolytes as claimed in claim 6, it is characterised in that the propylene sulfite Concentration be 0.9-1.1wt%, the concentration of the succinonitrile is 0.4-0.6wt%, and the concentration of the vinylene carbonate is 0.9- 1.1wt%。
- A kind of 8. high pressure resistant lithium-ion battery electrolytes as claimed in claim 1, it is characterised in that the propylene sulfite Concentration be 1wt%, the concentration of the succinonitrile is 0.5wt%, and the concentration of the vinylene carbonate is 1wt%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610564126.0A CN107634265A (en) | 2016-07-18 | 2016-07-18 | A kind of high pressure resistant lithium-ion battery electrolytes |
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| CN201610564126.0A CN107634265A (en) | 2016-07-18 | 2016-07-18 | A kind of high pressure resistant lithium-ion battery electrolytes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290088A (en) * | 2019-07-23 | 2021-01-29 | 张家港市国泰华荣化工新材料有限公司 | Non-aqueous electrolyte and lithium ion battery |
| CN113054246A (en) * | 2019-12-27 | 2021-06-29 | 张家港市国泰华荣化工新材料有限公司 | Safety electrolyte, preparation method thereof and solid-state battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290088A (en) * | 2019-07-23 | 2021-01-29 | 张家港市国泰华荣化工新材料有限公司 | Non-aqueous electrolyte and lithium ion battery |
| CN113054246A (en) * | 2019-12-27 | 2021-06-29 | 张家港市国泰华荣化工新材料有限公司 | Safety electrolyte, preparation method thereof and solid-state battery |
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