CN108520976A - Electrolyte of lithium ion battery and its preparation method and application - Google Patents
Electrolyte of lithium ion battery and its preparation method and application Download PDFInfo
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- CN108520976A CN108520976A CN201810445523.5A CN201810445523A CN108520976A CN 108520976 A CN108520976 A CN 108520976A CN 201810445523 A CN201810445523 A CN 201810445523A CN 108520976 A CN108520976 A CN 108520976A
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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
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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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- 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 electrolyte of lithium ion battery and its preparation method and application, the preparation method includes：Lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano silicon dioxide, additive and deionized water are mixed to prepare electrolyte；Electrolyte obtained enables to lithium ion battery effectively to discharge under fast charging and discharging and low temperature environment under big multiplying power current conditions.
Description
Technical field
The present invention relates to field of lithium ion battery, and in particular, to a kind of electrolyte of lithium ion battery and its preparation side
Method and application.
Background technology
With specified again in " 13 " national strategy new industry development plan new-energy automobile, new energy and
The strategic position of the green low-carbons industry such as energy conservation and environmental protection, China power battery field will be continuously obtained huge development, wherein phosphorus
Sour iron lithium ion battery with its excellent cyclicity, safety and it is environmentally protective and by extensive use.But traditional phosphoric acid
Iron lithium cannot meet new-energy automobile power battery requirement gradually because of its lower ionic mobility and electronic conductivity,
It is mainly reflected in：1, high rate charge-discharge performance is poor, and in high rate charge-discharge, inside battery polarization increases lithium ion battery
Add, internal resistance increases, and temperature rises comparatively fast, short circuit even occurs when serious, there are larger security risks.2, low temperature performance is poor,
Compared to room temperature and hot environment, under low temperature environment, ionic mobility and conductivity the becoming with the order of magnitude of ferric phosphate lithium cell
Gesture declines, and leads to the decline of cell discharge voltage platform, the reduction of battery capacity is caused can not put electricity even.How phosphorus is realized
Sour iron lithium ion battery effectively discharges under fast charging and discharging and low temperature environment to become current under big multiplying power current conditions
Technical staff's urgent problem.
Invention content
The object of the present invention is to provide a kind of electrolyte of lithium ion battery and its preparation method and application, electrolysis obtained
Liquid enables to lithium ion battery effectively to discharge under fast charging and discharging and low temperature environment under big multiplying power current conditions.
To achieve the goals above, the present invention provides a kind of preparation method of the electrolyte of lithium ion battery, the systems
Preparation Method includes：By lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nanometer two
Silica, additive and deionized water are mixed to prepare electrolyte；
On the basis of the total weight of electrolyte, the content of lithium hexafluoro phosphate is 10-30 weight %, the content of white vitriol
Content for 0.5-2.5 weight %, diethyl carbonate is 5-15 weight %, and the content of ethylene carbonate is 10-20 weight %, chlorine
The content for changing sodium is 1-5 weight %, and the content of potassium chloride is 1-5 weight %, nano silicon dioxide 0.5-2.5 weight %, addition
The content of agent is 2-10 weight %, balance deionized water.
The present invention also provides a kind of electrolyte of lithium ion battery, the electrolyte is made by above-mentioned preparation method.
The present invention also provides application of the above-mentioned electrolyte in lithium ion battery.
Through the above technical solutions, the present invention provides a kind of electrolyte of lithium ion battery and preparation method thereof and answering
With the preparation method includes：By lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, chlorination
Potassium, nano silicon dioxide, additive and deionized water are mixed to prepare electrolyte；On the basis of the total weight of electrolyte, hexafluoro phosphorus
The content of sour lithium is 10-30 weight %, and the content of white vitriol is 0.5-2.5 weight %, and the content of diethyl carbonate is 5-
The content of 15 weight %, ethylene carbonate are 10-20 weight %, and the content of sodium chloride is 1-5 weight %, and the content of potassium chloride is
The content of 1-5 weight %, nano silicon dioxide 0.5-2.5 weight %, additive are 2-10 weight %, balance deionized water.System
The electrolyte obtained enables to lithium ion battery effectively to be put under fast charging and discharging and low temperature environment under big multiplying power current conditions
Electricity.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of preparation method of the electrolyte of lithium ion battery, the preparation method includes：By hexafluoro
It lithium phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano silicon dioxide, additive and goes
Ionized water is mixed to prepare electrolyte；On the basis of the total weight of electrolyte, the content of lithium hexafluoro phosphate is 10-30 weight %, seven
The content of water zinc sulphate is 0.5-2.5 weight %, and the content of diethyl carbonate is 5-15 weight %, and the content of ethylene carbonate is
The content of 10-20 weight %, sodium chloride are 1-5 weight %, and the content of potassium chloride is 1-5 weight %, nano silicon dioxide 0.5-
The content of 2.5 weight %, additive are 2-10 weight %, balance deionized water.
In a kind of preferred embodiment of the present invention, in order to further such that electrolyte enables to lithium ion battery
It effectively discharges under fast charging and discharging and low temperature environment under big multiplying power current conditions, on the basis of the total weight of electrolyte, six
The content of lithium fluophosphate is 15-25 weight %, and the content of white vitriol is 1-1.5 weight %, and the content of diethyl carbonate is
The content of 8-12 weight %, ethylene carbonate are 12-16 weight %, and the content of sodium chloride is 2-4 weight %, the content of potassium chloride
Content for 2-4 weight %, nano silicon dioxide 1-1.5 weight %, additive is 4-6 weight %, balance deionized water.
In a kind of preferred embodiment of the present invention, in order to further such that electrolyte enables to lithium ion battery
It effectively discharges under fast charging and discharging and low temperature environment under big multiplying power current conditions, additive includes dimethoxy benzene and chlorobenzene
Methyl ether.
In a kind of preferred embodiment of the present invention, in order to further such that electrolyte enables to lithium ion battery
It effectively discharges under fast charging and discharging and low temperature environment under big multiplying power current conditions, on the basis of the total amount of additive, diformazan
The content of oxygroup benzene is 20-40 weight %, and the content of chloroanisole is 60-80 weight %.
In a kind of preferred embodiment of the present invention, in order to further such that electrolyte enables to lithium ion battery
It effectively discharges under fast charging and discharging and low temperature environment under big multiplying power current conditions, the preparation method further includes obtained
Lithium hydroxide is added in electrolyte, the pH of electrolyte is adjusted to 4 ± 0.5.
The present invention also provides a kind of electrolyte of lithium ion battery, the electrolyte is made by above-mentioned preparation method.
The present invention also provides application of the above-mentioned electrolyte in lithium ion battery.
The present invention will be described in detail by way of examples below.
Embodiment 1
By lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano-silica
SiClx, additive (being made of 20 weight % dimethoxy benzenes and 80 weight % chloroanisoles) and deionized water are mixed to prepare electrolysis
Liquid；Lithium hydroxide is added, the pH of electrolyte is adjusted to 4 ± 0.5；The total weight of electrolyte is 100g, wherein hexafluorophosphoric acid
The content of lithium is 15g, and the content of white vitriol is 1g, and the content of diethyl carbonate is 8g, and the content of ethylene carbonate is
The content of 12g, sodium chloride are 2g, and the content of potassium chloride is 2g, and the content of nano silicon dioxide 1g, additive are 4g, and surplus is gone
Ionized water.The electrolyte is in the environment of 25 DEG C, 8C multiplying power current charging and dischargings, and discharge capacity reaches 95% or more of rated capacity,
And 1C chargings 5C discharge cycles 2000 times, capacity retention ratio is 90% or more；At -20 DEG C, with 5C multiplying power current discharges, electric discharge
Capacity reaches 80% or more of rated capacity.
Embodiment 2
By lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano-silica
SiClx, additive (being made of 40g dimethoxy benzenes and 60g chloroanisoles) and deionized water are mixed to prepare electrolyte；Hydrogen is added
The pH of electrolyte is adjusted to 4 ± 0.5 by lithia；The total weight of electrolyte is 100g, wherein the content of lithium hexafluoro phosphate
Content for 25g, white vitriol is 1.5g, and the content of diethyl carbonate is 12g, and the content of ethylene carbonate is 16g, chlorination
The content of sodium is 4g, and the content of potassium chloride is 4g, and the content of nano silicon dioxide 1.5g, additive are 6g, balance deionized water.
The electrolyte is in the environment of 25 DEG C, 8C multiplying power current charging and dischargings, and discharge capacity reaches 95% or more of rated capacity, and 1C charges
5C discharge cycles 2000 times, capacity retention ratio is 90% or more；At -20 DEG C, with 5C multiplying power current discharges, discharge capacity reaches volume
80% or more of constant volume.
Embodiment 3
By lithium hexafluoro phosphate, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano-silica
SiClx, additive (being made of 30g dimethoxy benzenes and 70g chloroanisoles) and deionized water are mixed to prepare electrolyte；Hydrogen is added
The pH of electrolyte is adjusted to 4 ± 0.5 by lithia；The total weight of electrolyte is 100g, wherein the content of lithium hexafluoro phosphate
Content for 20g, white vitriol is 1.2g, and the content of diethyl carbonate is 10g, and the content of ethylene carbonate is 14g, chlorination
The content of sodium is 3g, and the content of potassium chloride is 3g, and the content of nano silicon dioxide 1.2g, additive are 5g, balance deionized water.
The electrolyte is in the environment of 25 DEG C, 8C multiplying power current charging and dischargings, and discharge capacity reaches 95% or more of rated capacity, and 1C charges
5C discharge cycles 2000 times, capacity retention ratio is 90% or more；At -20 DEG C, with 5C multiplying power current discharges, discharge capacity reaches volume
80% or more of constant volume.
Embodiment 4
It is carried out according to the method for embodiment 1, unlike, the total weight of electrolyte is 100g, wherein lithium hexafluoro phosphate
Content is 10g, and the content of white vitriol is 0.5g, and the content of diethyl carbonate is 5g, and the content of ethylene carbonate is 10g,
The content of sodium chloride is 1g, and the content of potassium chloride is 1g, nano silicon dioxide 0.5g, and the content of additive is 2g, surplus go from
Sub- water.The electrolyte is in the environment of 25 DEG C, 8C multiplying power current charging and dischargings, and discharge capacity reaches 95% or more of rated capacity, and
1C charging 5C discharge cycles 2000 times, capacity retention ratio is 90% or more；At -20 DEG C, with 5C multiplying power current discharges, electric discharge is held
Amount reaches 80% or more of rated capacity.
Embodiment 5
It is carried out according to the method for embodiment 1, unlike, the total weight of electrolyte is 100g, wherein lithium hexafluoro phosphate
Content is 30g, and the content of white vitriol is 2.5g, and the content of diethyl carbonate is 15g, and the content of ethylene carbonate is 20g,
The content of sodium chloride is 5g, and the content of potassium chloride is 5g, nano silicon dioxide 2.5g, and the content of additive is 10g, surplus go from
Sub- water.The electrolyte is in the environment of 25 DEG C, 8C multiplying power current charging and dischargings, and discharge capacity reaches 95% or more of rated capacity, and
1C charging 5C discharge cycles 2000 times, capacity retention ratio is 90% or more；At -20 DEG C, with 5C multiplying power current discharges, electric discharge is held
Amount reaches 80% or more of rated capacity.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of simple variants to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (7)
1. a kind of preparation method of the electrolyte of lithium ion battery, which is characterized in that the preparation method includes：By hexafluorophosphoric acid
Lithium, white vitriol, diethyl carbonate, ethylene carbonate, sodium chloride, potassium chloride, nano silicon dioxide, additive and deionization
Water is mixed to prepare electrolyte；
On the basis of the total weight of electrolyte, the content of lithium hexafluoro phosphate is 10-30 weight %, and the content of white vitriol is
The content of 0.5-2.5 weight %, diethyl carbonate are 5-15 weight %, and the content of ethylene carbonate is 10-20 weight %, chlorination
The content of sodium is 1-5 weight %, and the content of potassium chloride is 1-5 weight %, nano silicon dioxide 0.5-2.5 weight %, additive
Content be 2-10 weight %, balance deionized water.
2. preparation method according to claim 1, wherein on the basis of the total weight of electrolyte, lithium hexafluoro phosphate contains
Amount is 15-25 weight %, and the content of white vitriol is 1-1.5 weight %, and the content of diethyl carbonate is 8-12 weight %, carbon
The content of vinyl acetate is 12-16 weight %, and the content of sodium chloride is 2-4 weight %, and the content of potassium chloride is 2-4 weight %,
The content of nano silicon dioxide 1-1.5 weight %, additive are 4-6 weight %, balance deionized water.
3. preparation method according to claim 1 or 2, wherein additive includes dimethoxy benzene and chloroanisole.
4. preparation method according to claim 3, wherein on the basis of the total amount of additive, the content of dimethoxy benzene
Content for 20-40 weight %, chloroanisole is 60-80 weight %.
5. preparation method according to claim 1 or 2, wherein the preparation method further includes in electrolyte obtained
Lithium hydroxide is added, the pH of electrolyte is adjusted to 4 ± 0.5.
6. a kind of electrolyte of lithium ion battery, which is characterized in that the electrolyte is described in any one of claim 1-5
Preparation method be made.
7. application of the electrolyte according to claim 6 in lithium ion battery.
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| CN201810445523.5A CN108520976A (en) | 2018-05-11 | 2018-05-11 | Electrolyte of lithium ion battery and its preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504490A (en) * | 2019-08-23 | 2019-11-26 | 北京理工大学 | A kind of high-voltage electrolyte and preparation method thereof of siliceous based additive |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110504490A (en) * | 2019-08-23 | 2019-11-26 | 北京理工大学 | A kind of high-voltage electrolyte and preparation method thereof of siliceous based additive |
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