A kind of formula of the high function type eletrolysis solution for lithium ion battery
Technical field
The present invention relates to the formula of a kind of high function type eletrolysis solution for lithium ion battery, belong to lithium ion battery technology
Field.
Background technology
Electrolyte is the important component part of lithium battery, and it is the ion playing conduction between battery positive and negative electrode
Conductor, the performance of itself and the state of interface formed with both positive and negative polarity thereof largely affect the performance of battery.Excellent lithium
Battery nonaqueous electrolytic solution should possess some requirement following: (1) chemical stability is good, with the both positive and negative polarity active substance in battery and collection
There is not chemical reaction in fluid (general aluminium foil and Copper Foil);(2) electrochemical stability window width;(3) ionic conductivity is high, electronics
Electrical conductivity is low;(4) temperature range is properly that boiling point is high, and fusing point is low;(5) safety and low toxicity, non-environmental-pollution.
Lithium battery is the easily viscosity increase when transport and storage with nonaqueous electrolytic solution, and produces battery along with when storing
Between prolongation, internal resistance the most constantly increases, especially when dioxolanes ratio is higher, electrolyte viscosity B coefficent and in battery
Resistance impact aggravation.The main cause causing this phenomenon is in storage and transport process, and dioxolanes equal solvent is slowly polymerized, and acyclic acidic
The existence of border, hot environment and metal cation can accelerate polyreaction.The most any its viscosity of stablizing is that individual needs solves
Problem.
Summary of the invention
It is an object of the invention to provide the formula of a kind of high function type eletrolysis solution for lithium ion battery, can prepare steady
Determine viscosity and reduce the electrolyte of lithium battery internal resistance, in order to using the most as required.
To achieve these goals, technical scheme is as follows.
The formula of a kind of high function type eletrolysis solution for lithium ion battery, its preparation method comprises the steps:
(1) at dew point less than-40 DEG C, oxygen content less than in the environment of 2ppm, following materials is joined according to equal in quality ratio
Be set to as organic solvent: oxolane, Allyl carbonate, trifluoromethanesulfonic acid lithium, dimethyl sulfoxide, poly-aspartic-acid, to nitre
Yl benzoic acid, hexafluoroacetylacetone, alkene sultone;
(2) moisture of above-mentioned organic solvent is reduced to below 8ppm;
(3) add in organic solvent and occupy the following materials of machine solvent weight percent 5%~10%: CNT,
Disilver carbonate powder, its mass ratio is 3~5:1;
(4) mixture in step (3) adds and occupies the following materials of machine solvent weight percent 5%~8%: Malaysia
Acid imide, ferrous disulfide, stannous sulfate, its mass ratio is 2~4:3~5:1;
(5), after the solvent temperature obtained in step (4) is down to 0~2 DEG C, adds in nonaqueous electrolytic solution under stirring and account for
The following lithium salts of organic solvent percentage by weight 40%~60%: double oxalic acid borate lithiums, potassium manganate, lithium hexafluoro phosphate, its matter
Amount ratio is 2~4:3~5:1, obtains this product after mix homogeneously.
Further, in step (5), controlling described temperature in adition process is 5 DEG C~10 DEG C.
This beneficial effect of the invention is: the viscosity in the case of storing 60 days of the electrolyte in the present invention does not occurs
Change, effectively reduces the internal resistance after battery storage, and controls to add in nonaqueous electrolytic solution under specified temp lithium after injecting battery
Salt, the most effectively stops electrolyte polyreaction after producing, transporting and inject battery, the process of the method preparation electrolyte
Simply, easy to operate, it is adaptable to commercial production.
Detailed description of the invention
Below in conjunction with embodiment, the detailed description of the invention of the present invention is described, in order to be better understood from the present invention.
Embodiment 1
The formula of the high function type eletrolysis solution for lithium ion battery in the present embodiment, its preparation method includes walking as follows
Rapid:
(1) at dew point less than-40 DEG C, oxygen content less than in the environment of 2ppm, following materials is joined according to equal in quality ratio
Be set to as organic solvent: oxolane, Allyl carbonate, trifluoromethanesulfonic acid lithium, dimethyl sulfoxide, poly-aspartic-acid, to nitre
Yl benzoic acid, hexafluoroacetylacetone, alkene sultone;
(2) moisture of above-mentioned organic solvent is reduced to below 8ppm;
(3) add in organic solvent and occupy the following materials of machine solvent weight percent 5%: CNT, Disilver carbonate
Powder, its mass ratio is 3:1;(4) mixture in step (3) adds the following thing occupying machine solvent weight percent 8%
Material: maleimide, ferrous disulfide, stannous sulfate, its mass ratio is 2:3:1;
(5), after the solvent temperature obtained in step (4) is down to 0~2 DEG C, adds in nonaqueous electrolytic solution under stirring and account for
The following lithium salts of organic solvent percentage by weight 40%: double oxalic acid borate lithiums, potassium manganate, lithium hexafluoro phosphate, its mass ratio is
2:3:1, obtains this product after mix homogeneously.
In step (5), controlling described temperature in adition process is 5 DEG C.
Performance test data is as follows:
Electrolyte stores experiment
Viscosity before storing |
Viscosity after storing 30 days |
Viscosity after storing 60 days |
1.18mPa·S |
1.19mPa·S |
1.19mPa·S |
Inject internal resistance of cell change after lithium-ferrous disulfide AA battery
Internal resistance before storing |
Internal resistance after storing 30 days |
Internal resistance after storing 60 days |
182mΩ |
185mΩ |
187mΩ |
Embodiment 2
The formula of the high function type eletrolysis solution for lithium ion battery in the present embodiment, its preparation method includes walking as follows
Rapid:
(1) at dew point less than-40 DEG C, oxygen content less than in the environment of 2ppm, following materials is joined according to equal in quality ratio
Be set to as organic solvent: oxolane, Allyl carbonate, trifluoromethanesulfonic acid lithium, dimethyl sulfoxide, poly-aspartic-acid, to nitre
Yl benzoic acid, hexafluoroacetylacetone, alkene sultone;
(2) moisture of above-mentioned organic solvent is reduced to below 8ppm;
(3) add in organic solvent and occupy the following materials of machine solvent weight percent 10%: CNT, Disilver carbonate
Powder, its mass ratio is 5:1;
(4) mixture in step (3) adds and occupies the following materials of machine solvent weight percent 5%: maleimide
Amine, ferrous disulfide, stannous sulfate, its mass ratio is 4:5:1;
(5), after the solvent temperature obtained in step (4) is down to 0~2 DEG C, adds in nonaqueous electrolytic solution under stirring and account for
The following lithium salts of organic solvent percentage by weight 60%: double oxalic acid borate lithiums, potassium manganate, lithium hexafluoro phosphate, its mass ratio is
4:5:1, obtains this product after mix homogeneously.
In step (5), controlling described temperature in adition process is 10 DEG C.
Performance test data is as follows:
Electrolyte stores experiment
Viscosity before storing |
Viscosity after storing 30 days |
Viscosity after storing 60 days |
1.23mPa·S |
1.23mPa·S |
1.27mPa·S |
Inject internal resistance of cell change after lithium-ferrous disulfide AA battery
Internal resistance before storing |
Internal resistance after storing 30 days |
Internal resistance after storing 60 days |
192mΩ |
194mΩ |
195mΩ |
Embodiment 3
The formula of the high function type eletrolysis solution for lithium ion battery in the present embodiment, its preparation method includes walking as follows
Rapid:
(1) at dew point less than-40 DEG C, oxygen content less than in the environment of 2ppm, following materials is joined according to equal in quality ratio
Be set to as organic solvent: oxolane, Allyl carbonate, trifluoromethanesulfonic acid lithium, dimethyl sulfoxide, poly-aspartic-acid, to nitre
Yl benzoic acid, hexafluoroacetylacetone, alkene sultone;
(2) moisture of above-mentioned organic solvent is reduced to below 8ppm;
(3) add in organic solvent and occupy the following materials of machine solvent weight percent 8%: CNT, Disilver carbonate
Powder, its mass ratio is 4:1;
(4) mixture in step (3) adds and occupies the following materials of machine solvent weight percent 6%: maleimide
Amine, ferrous disulfide, stannous sulfate, its mass ratio is 3:4:1;
(5), after the solvent temperature obtained in step (4) is down to 0~2 DEG C, adds in nonaqueous electrolytic solution under stirring and account for
The following lithium salts of organic solvent percentage by weight 50%: double oxalic acid borate lithiums, potassium manganate, lithium hexafluoro phosphate, its mass ratio is
3:4:1, obtains this product after mix homogeneously.
In step (5), controlling described temperature in adition process is 8 DEG C.
Performance test data is as follows:
Electrolyte stores experiment
Viscosity before storing |
Viscosity after storing 30 days |
Viscosity after storing 60 days |
1.38mPa·S |
1.38mPa·S |
1.41mPa·S |
Inject internal resistance of cell change after lithium-ferrous disulfide AA battery
Internal resistance before storing |
Internal resistance after storing 30 days |
Internal resistance after storing 60 days |
179mΩ |
180mΩ |
182mΩ |
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.