CN107546414A - Low temperature lithium battery electrolytes and preparation method thereof - Google Patents
Low temperature lithium battery electrolytes and preparation method thereof Download PDFInfo
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- CN107546414A CN107546414A CN201710601106.0A CN201710601106A CN107546414A CN 107546414 A CN107546414 A CN 107546414A CN 201710601106 A CN201710601106 A CN 201710601106A CN 107546414 A CN107546414 A CN 107546414A
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Abstract
The invention provides a kind of low temperature lithium battery electrolytes and preparation method thereof, including electrolyte, organic solvent and additive, the electrolyte is LiFePO4, and the organic solvent includes PC and DEC, and the additive is multi-layer graphene；The multi-layer graphene includes multilayer chip graphene and diamond, and the diamond is located between adjacent two layers of multilayer chip graphene, and the carbon atom of the diamond and described multilayer chip graphene corresponds.The present invention provides a kind of low temperature lithium battery electrolytes and preparation method thereof, new additive material is added in the electrolyte material of lithium battery, realize in the relatively low environment of temperature, the electronics and ion channel got through battery electrolyte low-temperature setting and blocked, increase the purpose of ion activity, so that battery can preferably work when low temperature, it is minimum to be worked in the environment of 40 DEG C, the moment for avoiding lithium battery from being opened in electronic product burns, the security that increase lithium battery works at low ambient temperatures.
Description
Technical field
The present invention relates to technical field of lithium batteries, more particularly, to a kind of low temperature lithium battery electrolytes and preparation method thereof.
Background technology
Lithium ion battery:A kind of secondary cell (rechargeable battery), it rely primarily on lithium ion electrolyte and negative pole it
Between it is mobile come work.In charge and discharge process, Li+ comes and goes insertion and deintercalation between two electrodes:During charging, Li+ is from electrolysis
Liquid deintercalation, negative pole is embedded in by electrolyte, negative pole is in rich lithium state；It is then opposite during electric discharge.According to the electricity consumption of lithium ion battery institute
The difference of material is solved, lithium ion battery is divided into liquid lithium ionic cell and polymer Li-ion battery.Wherein, liquid lithium ion
Battery refers to the secondary cell that Li+ inlaid schemes are positive and negative electrode.Electrolyte uses lithium compound, and negative pole is used between lithium-carbon-coating
Compound.The normal operating temperature range of lithium ion battery is -20 DEG C~60 DEG C, the freezing point of lithium ion battery electrolyte solution
At -40 DEG C, easily freezing, environment below freezing is there is a possibility that lithium battery burns in the moment that electronic product is opened, therefore, ability
Domain personnel try to explore, to develop a kind of new material to improve the operating temperature range of lithium ion battery, make lithium from
Sub- battery can in the environment of less than -20 DEG C normal work, the moment for avoiding lithium battery from being opened in electronic product burn, increase lithium
The security that ion works at low ambient temperatures.
The content of the invention
, will be new the present invention solves the technical problem of a kind of low temperature lithium battery electrolytes and preparation method thereof are provided
Additive material is added in the electrolyte material of lithium battery, is realized in the relatively low environment of temperature, is got through battery electrolyte low temperature
The electronics and ion channel for solidifying and blocking, increase the purpose of ion activity, so that battery can be more preferable when low temperature
Work, minimum to be worked in the environment of -40 DEG C, the moment for avoiding lithium battery from being opened in electronic product burns, increase lithium
The security that battery works at low ambient temperatures.
In order to solve the above technical problems, one aspect of the present invention is：A kind of low temperature lithium battery electrolytes and
Its preparation method, including electrolyte, organic solvent and additive, the electrolyte are LiFePO4, and the organic solvent includes
PC (makrolon) and DEC (diethyl carbonate), the additive are multi-layer graphene；
The weight percentage of each component is as follows：The LiFePO4 is 15-25%, the PC is 35-41%, described
DEC is 35-41% and the multi-layer graphene is 3-5%；
The multi-layer graphene includes multilayer chip graphene and diamond, and the diamond is located at multilayer chip graphene
Adjacent two layers between, the carbon atom of the diamond and described multilayer chip graphene corresponds；
The weight ratio of the multilayer chip graphene and the diamond is (4-6)：1；
The multilayer chip graphene is 6-8 lamellar graphenes, and every layer of thickness of the multilayer chip graphene is
0.3-1.0nm, the interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.1-0.5nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.7-1.6nm.
Further say, the weight ratio of the multilayer chip graphene and the diamond is 5：1；
The number of plies of the multilayer chip graphene is 8 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.5nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.3nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.9nm.
Further say, the preparation method of the multi-layer graphene comprises the following steps：
Step 1: multilayer chip graphene is prepared using chemical deposition：With cathode-ray on silica substrate surface
One layer of nickel metal layer is deposited, the thickness of the nickel metal layer is 200-400nm；
Step 2: be passed through in the tube furnace of 950-1150 DEG C of temperature methane, hydrogen and ammonia composition gaseous mixture and
Common graphite powder, room temperature is cooled within 100ms, obtains multilayer chip graphene, the layer of multilayer chip graphene described herein
Number is 3-12 layers；
Step 3: more than 100,000 grades under cleanliness factor environment, by being peeled off after electron microscope observation with molecular knife, screening
Go out 6-8 lamellar graphenes；.
Step 4: the 6-8 lamellars graphene that step 3 filters out is mixed in proportion with diamond, in 100-200Pa
Vacuum condition and 600-800 DEG C of hot conditions under, at the uniform velocity stir 34-38h, get product.
Present invention also offers a kind of preparation method of low temperature lithium battery electrolytes, by LiFePO4, PC, DEC and multilayer
Graphene is proportionally added into stirred tank, and temperature control is evacuated to the electrolysis of 100-500P lithium ion batteries at 0-5 DEG C
Liquid, keep stirring 12-24h in the case of vacuum, mixing speed turns for 500-1000 per minute, got product.
The beneficial effects of the invention are as follows：
Added in the electrolytic solution in the present invention by novel-section prepared by multi-layer graphene and diamond after chemical reaction
Material, the number of plies of multi-layer graphene be 6-8 layers, and the reaction ratio of multi-layer graphene and diamond is 5：1, multi-layer graphene is with 3%-
5% ratio is added in electrolyte material, is realized in the relatively low environment of temperature, is got through battery electrolyte low-temperature setting and block
Electronics and ion channel, increase the purpose of ion activity it is minimum so that battery can preferably work when low temperature
It can be worked in the environment of -40 DEG C, the moment for avoiding lithium battery from being opened in electronic product burns, and increase lithium battery is in low temperature ring
The security to be worked under border.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Each several part mark is as follows in accompanying drawing：
Multi-layer graphene 100, multilayer chip graphene 101, carbon atom 102 and diamond 103.
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.Without departing substantially from spirit of the invention
In the case of essence, the modifications or substitutions made to the inventive method, step or condition, the protection model of the present invention is belonged to
Enclose.
A kind of low temperature lithium battery electrolytes and preparation method thereof, including electrolyte, organic solvent and additive, the electrolysis
Matter is LiFePO4, and the organic solvent includes PC and DEC, and the additive is multi-layer graphene 100；
The weight percentage of each component is as follows：The LiFePO4 is 15-25%, the PC is 35-41%, described
DEC is 35-41% and the multi-layer graphene is 3-5%；
The multi-layer graphene 100 includes multilayer chip graphene 101 and diamond 103, and the diamond is located at multilayer
Between adjacent two layers of flake graphite alkene, a pair of the carbon atom 102 1 of the diamond and described multilayer chip graphene
Should；
The weight ratio of the multilayer chip graphene and the diamond is (4-6)：1；
The multilayer chip graphene is 6-8 lamellar graphenes, and every layer of thickness of the multilayer chip graphene is
0.3-1.0nm, the interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.1-0.5nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.7-1.6nm.
Embodiment 1：The LiFePO4 is 15%, the PC is 41%, the DEC is 41% and the multi-layer graphene
For 3%；
As shown in figure 1, the weight ratio of the multilayer chip graphene and the diamond is 5：1；
The number of plies of the multilayer chip graphene is 8 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.5nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.3nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.9nm.
Embodiment 2：The LiFePO4 is 20%, the PC is 38%, the DEC is 38% and the multi-layer graphene
For 4%；
The weight ratio of the multilayer chip graphene and the diamond is 4：1；
The number of plies of the multilayer chip graphene is 8 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.3nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.4nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 1.2nm.
Embodiment 3：The LiFePO4 is 16%, the PC is 40%, the DEC is 40% and the multi-layer graphene
For 4%；
The weight ratio of the multilayer chip graphene and the diamond is 6：1；
The number of plies of the multilayer chip graphene is 7 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.6nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.5nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 1.6nm.
Embodiment 4：The LiFePO4 is 18%, the PC is 39%, the DEC is 39% and the multi-layer graphene
For 4%；
The weight ratio of the multilayer chip graphene and the diamond is 4.5：1；
The number of plies of the multilayer chip graphene is 6 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.7nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.2nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 1.0nm.
Embodiment 5：The LiFePO4 is 25%, the PC is 35%, the DEC is 35% and the multi-layer graphene
For 5%；
The weight ratio of the multilayer chip graphene and the diamond is 5.5：1；
The number of plies of the multilayer chip graphene is 6 lamellar graphenes, every layer of thickness of the multilayer chip graphene
Spend for 0.4nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.1nm；
The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.7nm.
Embodiments of the invention 1 are carried out in accordance with the following steps to the preparation method of the multi-layer graphene described in embodiment 5：
Step 1: multilayer chip graphene is prepared using chemical deposition：With cathode-ray on silica substrate surface
One layer of nickel metal layer is deposited, the thickness of the nickel metal layer is 200-400nm；
Step 2: be passed through in the tube furnace of 950-1150 DEG C of temperature methane, hydrogen and ammonia composition gaseous mixture and
Common graphite powder, room temperature is cooled within 100ms, obtains multilayer chip graphene, the layer of multilayer chip graphene described herein
Number is 3-12 layers；
Step 3: more than 100,000 grades under cleanliness factor environment, by being peeled off after electron microscope observation with molecular knife, screening
Go out 6-8 lamellar graphenes；
Step 4: the 6-8 lamellars graphene that step 3 filters out is mixed in proportion with diamond, in 100-200Pa
Vacuum condition and 600-800 DEG C of hot conditions under, at the uniform velocity stir 34-38h, get product.
In the present embodiment preferably, the thickness of the nickel metal layer is 300nm.
Embodiments of the invention 1 arrive the preparation method of the low temperature lithium battery electrolytes described in embodiment 5, in accordance with the following steps
Carry out：LiFePO4, PC, DEC and multi-layer graphene are proportionally added into stirred tank, temperature control vacuumizes at 0-5 DEG C
To 100-500P electrolyte for lithium ion battery, keep stirring 12-24h in the case of vacuum, mixing speed is 500- per minute
1000 turns, get product.
Added in the electrolytic solution in the present invention by novel-section prepared by multi-layer graphene and diamond after chemical reaction
Material, the number of plies of multi-layer graphene be 6-8 layers, and the reaction ratio of multi-layer graphene and diamond is 5：1, multi-layer graphene is with 3%-
5% ratio is added in electrolyte material, is realized in the relatively low environment of temperature, is got through battery electrolyte low-temperature setting and block
Electronics and ion channel, increase the purpose of ion activity it is minimum so that battery can preferably work when low temperature
It can be worked in the environment of -40 DEG C, the moment for avoiding lithium battery from being opened in electronic product burns, and increase lithium battery is in low temperature ring
The security to be worked under border.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.Here without exhaustive.And the obvious changes or variations thus extended out is still in the protection of the invention
Among scope.
Claims (4)
- A kind of 1. low temperature lithium battery electrolytes, it is characterised in that：Including electrolyte, organic solvent and additive, the electrolyte For LiFePO4, the organic solvent includes PC and DEC, and the additive is multi-layer graphene；The weight percentage of each component is as follows：The LiFePO4 is 15-25%, the PC is 35-41%, the DEC is 35-41% and the multi-layer graphene are 3-5%；The multi-layer graphene includes multilayer chip graphene and diamond, and the diamond is located at the phase of multilayer chip graphene Between adjacent two layers, the carbon atom of the diamond and described multilayer chip graphene corresponds；The weight ratio of the multilayer chip graphene and the diamond is (4-6):1；The multilayer chip graphene is 6-8 lamellar graphenes, and every layer of thickness of the multilayer chip graphene is 0.3- 1.0nm, the interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.1-0.5nm；The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.7-1.6nm.
- 2. low temperature lithium battery electrolytes according to claim 1, it is characterised in that：The multilayer chip graphene with it is described The weight ratio of diamond is 5:1；The number of plies of the multilayer chip graphene is 8 lamellar graphenes, and every layer of thickness of the multilayer chip graphene is 0.5nm；The interlamellar spacing of the adjacent two layers of the multilayer chip graphene is 0.3nm；The diamond is Spherical Carbon, and the particle diameter of the Spherical Carbon is 0.9nm.
- 3. low temperature lithium battery electrolytes according to claim 1, it is characterised in that：The preparation method of the multi-layer graphene Comprise the following steps：Step 1: multilayer chip graphene is prepared using chemical deposition：Deposited with cathode-ray on silica substrate surface One layer of nickel metal layer, the thickness of the nickel metal layer is 200-400nm；Step 2: methane, the gaseous mixture of hydrogen and ammonia composition and common are passed through in the tube furnace of 950-1150 DEG C of temperature Graphite powder, room temperature is cooled within 100ms, obtains multilayer chip graphene, the number of plies of multilayer chip graphene described herein is 3-12 layers；Step 3: more than 100,000 grades under cleanliness factor environment, by being peeled off after electron microscope observation with molecular knife, 6- is filtered out 8 lamellar graphenes；Step 4: the 6-8 lamellars graphene that step 3 filters out is mixed in proportion with diamond, in the true of 100-200Pa Under empty condition and 600-800 DEG C of hot conditions, 34-38h is at the uniform velocity stirred, is got product.
- A kind of 4. preparation method of low temperature lithium battery electrolytes according to claim 1, it is characterised in that：By ferric phosphate Lithium, PC, DEC and multi-layer graphene are proportionally added into stirred tank, and temperature control is evacuated to 100-500Pa lithiums at 0-5 DEG C Ion battery electrolyte, keep stirring 12-24h in the case of vacuum, mixing speed turns for 500-1000 per minute, produced into Product.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108682789A (en) * | 2018-06-01 | 2018-10-19 | 江苏芯界新能源科技有限公司 | A kind of low temperature lithium battery anode and preparation method thereof |
| CN108736066A (en) * | 2018-05-24 | 2018-11-02 | 江苏芯界新能源科技有限公司 | A kind of low temperature lithium battery electrolytes and preparation method thereof |
| CN113675457A (en) * | 2021-10-21 | 2021-11-19 | 惠州市纬世新能源有限公司 | Lithium battery electrolyte, preparation method thereof and lithium battery |
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Application publication date: 20180105 Assignee: Kunshan Jin Xin new energy Limited by Share Ltd Assignor: Kunshan state is the new energy power battery Co., Ltd. Contract record no.: 2018320010058 Denomination of invention: Low-temperature battery electrode and preparation method thereof License type: Exclusive License Record date: 20181114 |
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Application publication date: 20180105 |