CN113851718A - Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte - Google Patents

Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte Download PDF

Info

Publication number
CN113851718A
CN113851718A CN202111205461.9A CN202111205461A CN113851718A CN 113851718 A CN113851718 A CN 113851718A CN 202111205461 A CN202111205461 A CN 202111205461A CN 113851718 A CN113851718 A CN 113851718A
Authority
CN
China
Prior art keywords
electrolyte
lithium
additive
carbonate
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111205461.9A
Other languages
Chinese (zh)
Other versions
CN113851718B (en
Inventor
王元杰
薄晋科
田秀君
曹仕良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dalian CBAK Power Battery Co Ltd
Original Assignee
Dalian CBAK Power Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dalian CBAK Power Battery Co Ltd filed Critical Dalian CBAK Power Battery Co Ltd
Priority to CN202111205461.9A priority Critical patent/CN113851718B/en
Publication of CN113851718A publication Critical patent/CN113851718A/en
Application granted granted Critical
Publication of CN113851718B publication Critical patent/CN113851718B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to the field of batteries, in particular to an additive for an electrolyte and the electrolyte, which can improve the low-temperature performance of a lithium battery. The additive for the electrolyte provided by the invention can be superior to an electrolyte solvent, and a thin and continuous SEI film is formed in a lithium battery, and compared with the SEI film formed by the traditional electrolyte, the film has lower impedance of main components and better conductivity; at the same time, it can form LiN on the positive electrode surface side3、LiNO2、LiNO3The lithium ion battery (especially a ternary lithium ion battery) using the additive or the electrolyte for the electrolyte has excellent low-temperature performance.

Description

Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte
Technical Field
The invention relates to the field of batteries, in particular to an additive for an electrolyte and the electrolyte, which can improve the low-temperature performance of a lithium battery.
Background
In the 21 st century, lithium batteries are widely used in various fields such as mobile phones, computers, wearable devices, electric automobiles, two-wheel bicycles, electric tools, street lamps and the like.
In recent years, with the wider application of lithium batteries in various fields, the requirements on the performance and the application environment of the batteries are higher and higher, such as high-power discharge, ultralow-temperature discharge below-30 ℃, 10000 times of ultra-long cycle life and the like. Particularly in the low-temperature field, the demand becomes more and more vigorous, however, under the low-temperature condition, firstly, the discharge of the lithium battery becomes more and more difficult as the temperature is reduced until the lithium battery cannot discharge; and secondly, under the condition of low-temperature charging, the constant-current charging ratio of the battery is very low, namely, the battery cannot be fully charged, lithium separation is easy to occur on a low-temperature charging cathode, and the battery after lithium separation is easy to spontaneously combust or explode to cause safety accidents.
The components of the lithium ion battery electrolyte have higher reduction potential than lithium and are reduced on the surface of a carbon negative electrode during the first charging process in the electrolyte to produce a passivation film (SEI) composed of inorganic and organic compounds. The generated SEI can prevent the reduction reaction of the electrolyte at the negative electrode in the subsequent charge and discharge processes of the lithium ion battery, so that the lithium ion battery has longer cycle life compared with other types of reversible batteries, but the SEI film can influence the speed of lithium ions inserted into the negative electrode, so that the SEI film has obvious influence on the rate capability and the low-temperature performance of the lithium ion battery.
The main factors of poor low-temperature performance of lithium batteries are: firstly, the viscosity of the electrolyte is gradually increased along with the reduction of the temperature, and the migration rate of lithium ions in the electrolysis becomes lower and lower; secondly, lithium ions need to pass through an SEI film in the reciprocating process of transferring from the negative electrode to the electrolyte, and the components and the thickness of the SEI film greatly influence the transfer rate of the lithium ions; and thirdly, in the low-temperature charging process, particularly during low-temperature high-rate charging, active lithium is likely to be separated out from the surface of the negative pole piece, the active lithium and the electrolyte are irreversible, the thickness of an SEI film is further increased, the lithium ion migration is more difficult, the low-temperature performance of the lithium battery is poorer, and even safety accidents are caused.
In order to ensure the performance of the lithium ion battery, some negative film forming additives are generally selected to be added into the electrolyte to improve the components and performance of the SEI, and Vinylene Carbonate (VC), methylene ethylene carbonate or vinyl ethylene carbonate and the like are generally selected as the film forming additives. However, the film-forming additive has obvious disadvantages, the resistance of an SEI film formed by the film-forming additive is high, the direct current internal resistance of the battery is increased, the low-temperature performance of the battery is deteriorated, the content of the additive is increased, the deterioration is more obvious, and particularly, under the low-temperature condition, the lithium precipitation caused by low-temperature charging is easy to occur, and the safety of the battery is influenced. And the cycle life of the battery is difficult to guarantee by reducing the dosage of the additives or not using the additives.
For the ternary lithium ion battery, people find that the cycle life of the battery is short and the internal resistance is increased rapidly when the battery is discharged under the condition of low temperature and large current, and then analysis finds that the potential of the discharged anode of the ternary lithium ion battery is too high under the condition of large current, so that the electrolyte is continuously decomposed at the anode.
In addition, in the prior art, CN 109659613a discloses a low-temperature electrolyte for lithium battery, which comprises lithium salt, organic solvent, organic free radical and additive, and by the combination of the components and the proportion, a low-temperature applicable electrolyte is obtained. But it has the disadvantage that when TEMPO is used alone, the low temperature cycle life of the pouch is inferior to that of other additives alone; meanwhile, compared with the electrolyte using LiDFOB, VC and FEC, after TEMPO is added on the basis, the cycle life is only improved by 4.45 percentage points, and the effect is not obvious. CN 108321433A discloses an electrolyte additive and an electrolyte for improving the low-temperature performance of a lithium ion battery, and mentions that the additive is pyridine containing electron-donating group substituent groups, and the molecular structure of the additive does not contain strong electron-withdrawing group substituent groups. The additive is added into the electrolyte of the lithium ion battery, so that the ion transmission rate of the electrolyte at low temperature can be increased, the freezing point of the electrolyte can be reduced, the discharge capacity and the cycle performance of the lithium ion battery at low temperature are improved, and the wettability of the positive and negative pole pieces is enhanced. However, the pyridine material cannot form an effective SEI film on the negative electrode, and in practical use, additives such as VC, FEC, TSVC, PS, etc. are additionally added to form a film on the negative electrode. CN 103367803A discloses a lithium iron phosphate battery of lithium ion battery electrolyte for ultra-low temperature charge-discharge, and mentions that lithium ion battery's electrolyte includes lithium salt, polybasic organic solvent and additive, and the lithium iron phosphate battery that adopts this electrolyte can discharge and charge under the ultra-low temperature, gives consideration to charge-discharge under the high temperature environment simultaneously, and the performance is steady, and cycle life is long. However, it has a disadvantage that when it is used in a ternary lithium ion battery, the high potential of the positive electrode (usually 0.5V to 1V higher than that of the lithium iron phosphate positive electrode) causes the decomposition of the solvent and the low melting point additive, thereby shortening the battery life.
Disclosure of Invention
The invention aims to provide an additive for an electrolyte and the electrolyte, which can improve the low-temperature performance of a lithium battery.
In order to achieve the above object, the present invention provides an additive for electrolyte (or called "low temperature additive" or "low temperature additive for electrolyte") comprising one or more compounds represented by formula I:
Figure BDA0003306702780000031
in the formula I, R1、R2、R3、R4、R5、R6、R7Each independently selected from hydrogen, fluorine atoms or alkyl groups containing 1 to 4 carbon atoms.
The invention discovers that the low-temperature additive can be prioritized over an electrolyte solvent and participate in the formation of a passive film on the surface of a negative electrode material, so that the low-temperature additive is beneficial to the formation of a thin and continuous SEI film, and the main component of the film is LiN with low ion passage resistance and good conductivity3、LiNO2、LiNO3、LiF、li2S，Li2SO3And lithium alkyl ester (ROCO) as a main component of SEI film formed by conventional electrolyte2Li) n, alkyl lithium CH3(CH2) The content of nLi and the like is relatively small, and a low-resistance SEI film formed by the film has better low-temperature charge and discharge performance when the film is applied to a battery, and can form LiN on the positive electrode surface side3、LiNO2、LiNO3And the LiF layer can prevent the electrolyte from being oxidized and decomposed on the surface of the anode material under the low-temperature condition.
Preferably, in formula I, R1、R6、R7Each independently selected from hydrogen, fluorine atom or methyl group, R2、R3、R4、R5Represents H.
As a preferred embodiment, the compound has the structure shown in any one of the following:
Figure BDA0003306702780000041
preferably, the additive for the electrolyte further comprises an auxiliary component, wherein the auxiliary component is one or more of methylene methanedisulfonate, lithium difluorophosphate and lithium difluorooxalato borate.
The above-mentioned auxiliary components form li having a low resistance in the SEI film2S、Li3B、Li3P, the composition of the SEI film can be further improved.
More preferably, when the ratio of the mass of the auxiliary component to the mass of one or more compounds is 1:3-2:1, the composition of the SEI film is more excellent, which is beneficial to further reducing the resistance of the SEI film.
Furthermore, the invention also provides a lithium battery electrolyte (or called 'lithium battery low-temperature electrolyte' or 'ternary lithium ion battery low-temperature electrolyte'), which contains the additive for the electrolyte.
Preferably, the additive for the electrolyte is added in an amount of 0.2 to 2%, more preferably 1 to 2%, based on the total mass of the electrolyte for the lithium battery.
Preferably, the lithium battery electrolyte further contains an organic solvent, wherein the organic solvent comprises a component A and a component B in a mass ratio of 2:8-5: 5; more preferably, the mass ratio of the component A to the component B is 3:7-4: 6;
wherein the component A is prepared from (1-2) by mass: (1-3) a mixture of the cyclic carbonate and the chain carbonate; more preferably, the mass ratio of the cyclic carbonate to the chain carbonate is 1 (1-1.2);
the component B is chain carboxylic ester.
Further preferably, the cyclic carbonate is one or both of ethylene carbonate and propylene carbonate;
further preferably, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate;
further preferably, the chain carboxylate is one or more of methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate and propyl butyrate.
After the organic solvent is added into the lithium battery electrolyte in the manner, the electrolyte has relatively low viscosity at low temperature, and lithium ions have good passing performance, so that the low-temperature performance of the lithium battery is further improved.
Preferably, the lithium battery electrolyte further contains a lithium salt, and the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate.
More preferably, the amount of the lithium salt added is 12 to 20%, more preferably 15 to 20%, based on the total mass of the lithium battery electrolyte.
The above solutions can be combined by the skilled person according to common general knowledge to obtain a preferred solution of the lithium battery electrolyte according to the invention.
Preferably, the lithium battery electrolyte comprises the following components in parts by weight:
78-87.8 parts of organic solvent, 12-20 parts of lithium salt and 0.2-2 parts of additive for electrolyte.
Further, the invention also provides the application of the additive for the electrolyte or the lithium battery electrolyte in any one of the following aspects:
(1) the low-temperature performance of the lithium ion battery is improved;
(2) and the SEI film impedance of the lithium ion battery is reduced.
Preferably, the lithium ion battery is a ternary lithium ion battery.
Furthermore, the invention also provides a lithium ion battery which contains the lithium battery electrolyte.
Preferably, the lithium ion battery is a ternary lithium ion battery.
Based on the technical scheme, the invention has the following beneficial effects:
the additive provided by the invention can be superior to an electrolyte solvent, and a thin and continuous SEI film is formed in a lithium battery, and compared with the SEI film formed by the traditional electrolyte, the film has lower impedance of main components and better conductivity; at the same time, it can form LiN on the positive electrode surface side3、LiNO2、LiNO3And the LiF layer can prevent the electrolyte from being oxidized and decomposed on the surface of the anode material under the low-temperature condition. After the auxiliary component is added, the SEI film has more excellent composition components, is favorable for further reducing the impedance of the SEI film, and has more excellent low-temperature charge and discharge performance when being applied to a battery. In addition, after the organic solvent is added in the mode of the invention, the electrolyte has relatively low viscosity at low temperature, and lithium ions have better passing performance. Therefore, the lithium battery (especially ternary lithium ion battery) using the electrolyte of the present invention has excellent low temperature performance.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The person skilled in the art will be able to ascertain, on the basis of the following examples, additives which comprise the compounds according to the invention and auxiliary components and which are not described in any greater detail here.
The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
Example 1
The present example provides a low temperature additive a and a low temperature electrolyte 1 to which the low temperature additive a is added.
The structure of the low-temperature additive A is shown as the following formula I-1:
Figure BDA0003306702780000071
the formulation of the low temperature electrolyte 1 is as follows: 15.6g of lithium hexafluorophosphate, 1g of methylene methanedisulfonate, 0.5g of the low-temperature additive A and 82.9g of the organic solvent (12.435 g of ethylene carbonate, 14.922g of ethyl methyl carbonate and 55.543g of propyl propionate, wherein the mass ratio of the three is 15:18: 67).
During preparation, 15.6g of lithium hexafluorophosphate, 1g of methylene methanedisulfonate and 0.5g of low-temperature additive A are dissolved in 82.9g of organic solvent and uniformly mixed to prepare the electrolyte.
Example 2
This example provides a low temperature additive B and a low temperature electrolyte 2 to which the low temperature additive B is added.
The structure of the low-temperature additive B is shown as the following formula I-2:
Figure BDA0003306702780000081
the formulation of the low temperature electrolyte 2 is as follows: 20g of lithium hexafluorophosphate, 0.5g of lithium difluorooxalato borate, 1.3g of low-temperature additive B and 78.2g of organic solvent (15.640 g of ethylene carbonate, 15.640g of methyl ethyl carbonate and 46.920g of ethyl propionate, wherein the mass ratio of the three is 20:20: 60).
During preparation, 20g of lithium hexafluorophosphate, 0.5g of lithium difluorooxalato borate and 1.3g of low-temperature additive B are dissolved in 78.2g of organic solvent and are mixed uniformly to prepare the electrolyte.
Example 3
This example provides a low temperature electrolyte 3 with low temperature addition of C and with low temperature addition of C.
The structure of the low-temperature additive C is shown as the following formula I-3:
Figure BDA0003306702780000082
the formula of the low-temperature electrolyte 3 is as follows: 18.0g of lithium hexafluorophosphate, 0.5g of lithium difluorooxalato pentanate, 1.5g of low-temperature additive C and 80g of organic solvent (12.800 g of ethylene carbonate, 15.200g of dimethyl carbonate and 52.000g of propyl propionate, wherein the mass ratio of the three is 16:19: 65).
During preparation, 18.0g of lithium hexafluorophosphate, 0.5g of lithium difluorooxalato Pentium and 1.5g of low-temperature additive C are dissolved in 80g of organic solvent and uniformly mixed to prepare the electrolyte.
Example 4
This example provides a low temperature additive D and a low temperature electrolyte 4 to which the low temperature additive D is added.
The structure of the low-temperature additive D is shown as the following formula I-4:
Figure BDA0003306702780000091
the formula of the low-temperature electrolyte 4 is as follows: 12g of lithium hexafluorophosphate, 0.3g of lithium difluorophosphate, 0.3g of lithium difluorooxalato borate, 0.4g of low-temperature additive D, and 87.0g of organic solvent (15.66 g of ethylene carbonate, 15.66g of ethyl methyl carbonate, and 55.680g of propyl propionate in a mass ratio of 18:18: 64).
In the preparation, 12g of lithium hexafluorophosphate, 0.3g of lithium difluorophosphate, 0.3g of lithium difluorooxalato borate and 0.4g of low-temperature additive D were dissolved in 87.0g of an organic solvent, and mixed uniformly to prepare an electrolyte.
Comparative example 1
This comparative example provides a low temperature electrolyte 5 prepared as follows: 15.6g of lithium hexafluorophosphate and 1g of methylene methyldisulfonate were dissolved in 83.4g of an organic solvent (12.510 g of ethylene carbonate, 15.012g of ethyl methyl carbonate and 55.878g of propyl propionate in a mass ratio of 15:18:67), and the mixture was mixed uniformly to prepare an electrolyte.
Comparative example 2
This comparative example provides a low temperature electrolyte 6 prepared as follows: 20g of lithium hexafluorophosphate and 0.5g of lithium difluorooxalato borate were dissolved in 79.5g of an organic solvent (15.90 g of ethylene carbonate, 15.90g of ethyl methyl carbonate and 47.70g of ethyl propionate in a mass ratio of 20:20:60) and mixed uniformly to prepare an electrolyte.
Comparative example 3
This comparative example provides a low temperature electrolyte 7 prepared as follows: 18.0g of lithium hexafluorophosphate and 0.5g of lithium difluorooxalato pentanate were dissolved in 81.5g of an organic solvent (13.040 g of ethylene carbonate, 15.485g of dimethyl carbonate and 52.975g of propyl propionate in a mass ratio of 16:19:65), and the mixture was mixed uniformly to prepare an electrolyte.
Comparative example 4
This comparative example provides a low temperature electrolyte 8 prepared as follows: 12g of lithium hexafluorophosphate, 0.3g of lithium difluorophosphate and 0.3g of lithium difluorooxalato borate were dissolved in 87.4g of an organic solvent (15.732 g of ethylene carbonate, 15.732g of methyl ethyl carbonate and 55.936g of propyl propionate in a mass ratio of 18:18:64), and the mixture was mixed uniformly to prepare an electrolyte.
Test examples
The electrolytes for lithium batteries prepared in examples 1 to 4 and comparative examples 1 to 4 were injected into 26650 to 5.0Ah cells (positive electrode ternary material, negative electrode graphite) to prepare batteries.
(1) Respectively charging the prepared battery at a multiplying power of 0.2C at the temperature of minus 20 ℃, charging at a multiplying power of 0.5C at the temperature of minus 40 ℃, and recording constant current charging ratio data during charging;
(2) the prepared battery was subjected to a 1C/1C charge-discharge cycle test at-20 ℃, and the capacity retention rate was recorded after 300 cycles, with the results shown in Table 1 below.
TABLE 1
Figure BDA0003306702780000101
From the above results, it can be seen that the electrolyte of the present invention has excellent low temperature properties.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. An additive for an electrolyte, comprising one or more compounds of formula I:
Figure FDA0003306702770000011
in the formula I, R1、R2、R3、R4、R5、R6、R7Each independently selected from hydrogen, fluorine atoms or alkyl groups containing 1 to 4 carbon atoms.
2. Additive for electrolytes according to claim 1, characterized in that in formula I, R1、R6、R7Each independently selected from hydrogen, fluorine atom or methyl group, R2、R3、R4、R5Represents H.
3. The additive for the electrolyte according to claim 1 or 2, further comprising an auxiliary component, wherein the auxiliary component is one or more of methylene methanedisulfonate, lithium difluorophosphate, and lithium difluorooxalato borate; preferably, the ratio of the mass of the auxiliary component to the mass of one or more of the compounds is 1:3 to 2: 1.
4. An electrolyte for lithium batteries, characterized by containing the additive for electrolytes according to any one of claims 1 to 3.
5. The lithium battery electrolyte as claimed in claim 4, wherein the additive for the electrolyte is added in an amount of 0.2 to 2%, more preferably 1 to 2%, based on the total mass of the lithium battery electrolyte.
6. The lithium battery electrolyte as claimed in claim 4 or 5, characterized by further comprising an organic solvent comprising component A and component B in a mass ratio of 2:8 to 5: 5;
wherein the component A is prepared from (1-2) by mass: (1-3) a mixture of the cyclic carbonate and the chain carbonate;
the component B is chain carboxylate;
preferably, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate;
and/or the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate;
and/or the chain carboxylic ester is one or more of methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate and propyl butyrate.
7. The electrolyte for a lithium battery according to any one of claims 4 to 6, further comprising a lithium salt, wherein the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate;
the amount of the lithium salt added is preferably 12 to 20%, more preferably 15 to 20%, based on the total mass of the lithium battery electrolyte.
8. The lithium battery electrolyte as claimed in claim 7, which comprises the following components in parts by weight:
78-87.8 parts of organic solvent, 12-20 parts of lithium salt and 0.2-2 parts of additive for electrolyte.
9. Use of an additive for an electrolyte according to any one of claims 1 to 3 or a lithium battery electrolyte according to any one of claims 4 to 8 in any one of the following:
(1) the low-temperature performance of the lithium ion battery is improved;
(2) the impedance of an SEI film of the lithium ion battery is reduced;
preferably, the lithium ion battery is a ternary lithium ion battery.
10. A lithium ion battery comprising the lithium battery electrolyte according to any one of claims 4 to 8;
preferably, the lithium ion battery is a ternary lithium ion battery.
CN202111205461.9A 2021-10-15 2021-10-15 Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte Active CN113851718B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111205461.9A CN113851718B (en) 2021-10-15 2021-10-15 Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111205461.9A CN113851718B (en) 2021-10-15 2021-10-15 Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte

Publications (2)

Publication Number Publication Date
CN113851718A true CN113851718A (en) 2021-12-28
CN113851718B CN113851718B (en) 2023-05-09

Family

ID=78978519

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111205461.9A Active CN113851718B (en) 2021-10-15 2021-10-15 Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte

Country Status (1)

Country Link
CN (1) CN113851718B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260725A (en) * 2007-04-13 2008-10-30 Ohara Yakuhin Kogyo Kk Method for producing 2-imino-4-thiazolidinone
JP2014170689A (en) * 2013-03-04 2014-09-18 Mitsui Chemicals Inc Nonaqueous electrolyte and lithium secondary battery
CN106099183A (en) * 2016-06-28 2016-11-09 宁德市凯欣电池材料有限公司 A kind of electrolyte containing propane sulfonic acid pyridiniujm and use the battery of this electrolyte
US20170317385A1 (en) * 2014-12-17 2017-11-02 Basf Corporation Electrolyte Compositions For Rechargeable Lithium Ion Batteries
CN108376800A (en) * 2018-02-02 2018-08-07 江苏海基新能源股份有限公司 The electrolyte and lithium ion battery of high-temperature lithium ion battery cycle performance can be improved
CN111029654A (en) * 2019-12-20 2020-04-17 杉杉新材料（衢州）有限公司 Electrolyte and lithium ion battery using same
CN111763200A (en) * 2020-07-13 2020-10-13 香河昆仑化学制品有限公司 Cyclic carbonic acid vinyl sulfate ester as lithium ion battery electrolyte additive and preparation method thereof
CN112054241A (en) * 2020-10-15 2020-12-08 广州天赐高新材料股份有限公司 Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260725A (en) * 2007-04-13 2008-10-30 Ohara Yakuhin Kogyo Kk Method for producing 2-imino-4-thiazolidinone
JP2014170689A (en) * 2013-03-04 2014-09-18 Mitsui Chemicals Inc Nonaqueous electrolyte and lithium secondary battery
US20170317385A1 (en) * 2014-12-17 2017-11-02 Basf Corporation Electrolyte Compositions For Rechargeable Lithium Ion Batteries
CN106099183A (en) * 2016-06-28 2016-11-09 宁德市凯欣电池材料有限公司 A kind of electrolyte containing propane sulfonic acid pyridiniujm and use the battery of this electrolyte
CN108376800A (en) * 2018-02-02 2018-08-07 江苏海基新能源股份有限公司 The electrolyte and lithium ion battery of high-temperature lithium ion battery cycle performance can be improved
CN111029654A (en) * 2019-12-20 2020-04-17 杉杉新材料（衢州）有限公司 Electrolyte and lithium ion battery using same
CN111763200A (en) * 2020-07-13 2020-10-13 香河昆仑化学制品有限公司 Cyclic carbonic acid vinyl sulfate ester as lithium ion battery electrolyte additive and preparation method thereof
CN112054241A (en) * 2020-10-15 2020-12-08 广州天赐高新材料股份有限公司 Fluorine-containing sulfonate electrolyte additive, electrolyte containing additive and lithium ion battery

Also Published As

Publication number Publication date
CN113851718B (en) 2023-05-09

Similar Documents

Publication Publication Date Title
CN109860709B (en) Electrolyte for improving low-temperature performance of lithium ion battery and lithium ion battery containing electrolyte
CN105826606A (en) Electrolyte and lithium ion battery containing same
CN106785044A (en) A kind of electrolyte and secondary cell
CN109309226A (en) Electrochemical energy storage device
WO2018024095A1 (en) Lithium-ion battery additive, battery containing additive, and preparation method
WO2022116589A1 (en) Electrolyte additive, use thereof and non-aqueous electrolyte containing additive
WO2021073465A1 (en) Electrolyte for lithium ion battery, lithium ion battery, battery module, battery pack and device
CN109193028B (en) Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same
WO2023272864A1 (en) Electrolyte solution, preparation method therefor and lithium ion battery
CN105449279A (en) Non-aqueous electrolyte solution and lithium-ion battery using same
EP3547434A1 (en) Non-aqueous electrolyte of lithium-ion battery and lithium-ion battery
CN115458810B (en) Electrolyte and lithium ion battery
CN113078358A (en) Lithium ion battery non-aqueous electrolyte and lithium ion battery thereof
CN109786830B (en) Electrolyte containing silicon solvent and thiophene additive and lithium ion battery using electrolyte
CN109473717B (en) Electrolyte suitable for high-voltage high-nickel power battery and high-voltage high-nickel power battery
CN111211352A (en) Functional additive for lithium ion battery electrolyte, lithium ion battery electrolyte and lithium ion battery
CN114156536B (en) Additive, electrolyte and application thereof in improving low-temperature performance of lithium battery
CN116826175B (en) Wide-temperature-range non-aqueous electrolyte, lithium ion battery, battery module, battery pack and electricity utilization device
CN108987809A (en) A kind of non-aqueous electrolyte for lithium ion cell and the lithium ion battery using the electrolyte
CN117039151A (en) Lithium ion battery electrolyte and lithium ion battery containing same
CN116231075A (en) Electrolyte containing overcharge-preventing additive and lithium ion battery
CN113851718A (en) Additive for electrolyte capable of improving low-temperature performance of lithium battery and electrolyte
CN115207472A (en) Electrolyte, preparation method and lithium ion battery comprising electrolyte
CN109802177B (en) Electrolyte containing silicon solvent and pyridine additive and lithium ion battery using electrolyte
CN114725516A (en) Electrolyte, preparation method thereof and lithium ion battery containing electrolyte

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant