CN115084653A - Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery - Google Patents

Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery Download PDF

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CN115084653A
CN115084653A CN202210675463.2A CN202210675463A CN115084653A CN 115084653 A CN115084653 A CN 115084653A CN 202210675463 A CN202210675463 A CN 202210675463A CN 115084653 A CN115084653 A CN 115084653A
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additive
lithium
sodium
electrolyte
carbonate
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范立双
李檬
张宇
张乃庆
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Harbin Institute of Technology
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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
    • 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
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte

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Abstract

The invention discloses a composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery, which consists of an additive A and an additive B, wherein: the mass ratio of the additive A to the additive B is 0.25-2: 0.5 to 2; the additive A is an amide derivative containing silane or silicofluoric alkyl; the additive B is one or more of vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate and difluoroethylene carbonate. Different from the introduction of multiple simple additives, the stable polymer SEI and CEI films are formed through the polymerization reaction of the additive A and the additive B in the circulation process, the stable films can uniformly shuttle sodium (lithium) ions, the erosion of electrolyte to anode and cathode materials and the consumption of sodium (lithium) are reduced, the overall circulation stability of the battery is improved, and a new idea is provided for the design of the electrolyte.

Description

Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery
Technical Field
The invention belongs to the field of electrochemical energy storage of sodium and lithium ion batteries, relates to an electrolyte additive of an alkali metal battery, and particularly relates to a composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery.
Background
Lithium ion batteries are widely used in energy storage devices because of their advantages of high specific energy, high voltage, good cycle performance, environmental friendliness, and the like. However, with the rapid consumption of lithium resources, sodium batteries are receiving more and more attention due to their advantages of low cost and abundant resources, and become a suitable lithium battery substitute. In any kind of battery, the application standard of the battery is inevitably improved along with the development of portable communication equipment and electric vehicles, but the high market penetration rate of the current electric vehicles still cannot be realized, and important factors include the difficult guarantee of the safety and the long cycle stability of the battery. Therefore, improvement of battery safety and long cycle stability will become new market demands.
Today, several additives are added to alkali metal battery electrolyte formulations to improve battery performance, such as film forming additives, acid product scavengers, flame retardant additives, and the like. CN104752763A discloses a new additive system for lithium ion battery electrolyte, which contains multiple additives, but it cannot capture hydrofluoric acid effectively, and the cycle performance of the battery needs to be improved. Compared with lithium batteries, the formula of the electrolyte containing the additive of the sodium ion battery is rarely and rarely researched.
Therefore, the invention discloses an electrolyte formula suitable for a sodium (lithium) ion energy storage battery, so that the battery has better safety and long cycle performance, and has extremely important significance for the development of alkali metal secondary batteries.
Disclosure of Invention
The invention aims to provide a composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery, which can improve the safety of the battery, inhibit side reactions, remove hydrofluoric acid generated in the cycle process and improve the multiplying power and the long cycle performance of the battery.
The purpose of the invention is realized by the following technical scheme:
a composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery is composed of an additive A and an additive B, wherein:
the mass ratio of the additive A to the additive B is 0.25-2: 0.5 to 2, preferably 0.25 to 1: 0.5 to 1;
the additive A is an amide derivative containing a silane group or a silicofluoric alkyl group, such as: an acetamide derivative containing a trimethylsilyl group, preferably N, O-bis (trimethylsilyl) acetamide;
the additive B is one or more of vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate and difluoroethylene carbonate, and is preferably vinylene carbonate.
The composite electrolyte additive can be applied to a sodium (lithium) ion battery.
An electrolyte containing the composite electrolyte additive comprises 8-18 wt% of conductive salt, 80-90 wt% of solvent, 0.25-2 wt% of additive A and 0.5-2 wt% of additive B, wherein:
the conductive salt is sodium salt or lithium salt;
the sodium salt is one or more of sodium hexafluorophosphate, sodium bifluorosulfonyl imide, sodium bistrifluoromethanesulfonimide and sodium perchlorate, preferably sodium hexafluorophosphate, and the content of the sodium salt is 13 wt%;
the lithium salt is one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide and lithium tetrafluoroborate, preferably lithium hexafluorophosphate, and the content of the lithium salt is 13 wt%;
the solvent is one or more of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and diethyl carbonate, preferably a mixture of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7;
the electrolyte can be used in a sodium (lithium) ion battery.
Compared with the prior art, the invention has the following advantages:
1. different from the introduction of multiple simple additives, the invention forms compact and stable polymer SEI and CEI films through the polymerization reaction of the additive A and the additive B in the circulation process, the stable films can evenly shuttle sodium (lithium) ions, the corrosion of electrolyte to anode and cathode materials and the consumption of sodium (lithium) are reduced, the integral circulation stability of the battery is improved, and a new idea is provided for the design of the electrolyte.
2. The additive disclosed by the invention has a lower oxidation potential and a higher reduction potential, can preferentially participate in the formation of a stable interface, inhibits the decomposition of a solvent, reduces the interface impedance along with the introduction of the additive, promotes the rapid transmission of ions, and improves the rate capability of a battery.
3. The electrolyte can remove acidic substances such as hydrofluoric acid and the like generated in the circulating process due to the existence of the additive A, inhibits the decomposition of salt, improves the safety of the battery, and has excellent long-circulating performance at normal temperature and high temperature.
Drawings
Fig. 1 is a discharge curve diagram of lithium iron phosphate batteries of example 2, comparative example 1, comparative example 3, and comparative example 6 at 10C;
fig. 2 is a graph showing normal temperature cycle curves at 1C for the lithium iron phosphate batteries of example 2 and comparative example 1.
Detailed Description
The technical solutions of the present invention are further described below with reference to the drawings and the embodiments, but the present invention is not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Taking the vinylene carbonate additive as an example, the vinylene carbonate additive is added into the electrolyte to form a polymer SEI film on a negative electrode, so that the stability of an interface is improved, and further the cycle performance of the battery is improved, but the impedance of the interface is increased by excessive vinylene carbonate, and slow ion migration is caused. According to the invention, by reducing the addition amount of vinylene carbonate, a low-cost N, O-bis (trimethylsilyl) acetamide additive is introduced as a synergy, and the N, O-bis (trimethylsilyl) acetamide additive and the vinylene carbonate undergo a copolymerization reaction to form a new high-conductivity polymer interface, so that the impedance is reduced, the effect is better than that of singly adding any additive, and the cost of the electrolyte is reduced. This solution will therefore be described in detail below.
Example 1
An additive-containing lithium ion battery electrolyte, wherein: the lithium salt being LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86.25% by weight, additive A was N, O-bis (trimethylsilyl) acetamide in an amount of 0.25% by weight, and additive B was vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 2
An additive-containing lithium ion battery electrolyte, wherein: the lithium salt being LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86% by weight, additive A was N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, and additive B was vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 3
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 85.5% by weight, additive A is N, O-bis (trimethylsilyl) acetamide in an amount of 1% by weight, and additive B is vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 4
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 85.5% by weight, additive A is N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, additive B is vinylene carbonate in an amount of 1% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 5
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 85% by weight, additive A being N, O-bis (trimethylsilyl) acetamide in an amount of 1% by weight, additive B being vinylene carbonate in an amount of 1% by weight. The preparation of the electrolyte is completed in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 6
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86.25% by weight, additive A in the form of N, O-bis (trimethylsilyl) acetamide in an amount of 2% by weight and additive B in the form of vinylene carbonate in an amount of 1% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 7
An additive-containing lithium ion battery electrolyte, wherein: the lithium salt being LiPO 2 F 2 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86% by weight, additive A was N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, and additive B was vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 8
An additive-containing lithium ion battery electrolyte, wherein: the lithium salt being LiPF 6 The content is 13wt%, the solvent is ethylene carbonate, dimethyl carbonate and diethyl carbonate, and the mass ratio is 1: 1: 1 in an amount of 86% by weight, additive A being N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, additive B being vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 9
Lithium ion battery electrolyte containing additive and preparation method thereofThe method comprises the following steps: the lithium salt being LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7, the content is 85.5wt%, the additive A is N-methyl-N-trimethylsilane trifluoroacetamide, the content is 1wt%, and the additive B is vinylene carbonate, the content is 0.5 wt%. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 10
An additive-containing lithium ion battery electrolyte, wherein: the lithium salt being LiPF 6 The content is 13wt%, the solvent is ethylene carbonate, dimethyl carbonate and diethyl carbonate, and the mass ratio is 1: 1: 1 in an amount of 85.5% by weight, additive A is N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, additive B is fluoroethylene carbonate in an amount of 1% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 11
Sodium ion battery electrolyte containing additive, wherein sodium salt is NaPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86% by weight, additive A was N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, and additive B was vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Example 12
Sodium ion battery electrolyte containing additive, wherein sodium salt is NaClO 4 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86% by weight, additive A was N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight, and additive B was vinylene carbonate in an amount of 0.5% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
For comparison with a blank electrolyte, the following comparative example was carried out.
Comparative example 1
A lithium ion battery electrolyte, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7, the content is 87wt%, and no additive is added. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 2
Sodium ion battery electrolyte, wherein the sodium salt is NaPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7, the content is 87wt%, and no additive is added. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 3
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7, the content is 86.5wt%, the additive is vinylene carbonate, and the content is 0.5 wt%. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 4
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7, the content is 86wt%, the additive is vinylene carbonate, and the content is 1 wt%. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 5
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86.75% by weight, and the additive was N, O-bis (trimethylsilyl) acetamide in an amount of 0.25% by weight. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 6
Lithium ion containing additiveElectrolyte of sub-battery, wherein lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86.5% by weight, and the additive is N, O-bis (trimethylsilyl) acetamide in an amount of 0.5% by weight. The preparation of the electrolyte is completed in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
Comparative example 7
An additive-containing electrolyte for lithium ion battery, wherein the lithium salt is LiPF 6 The content is 13wt%, the solvent is ethylene carbonate and methyl ethyl carbonate, and the mass ratio is 3: 7 in an amount of 86wt% and the additive is N, O-bis (trimethylsilyl) acetamide in an amount of 1 wt%. The electrolyte is prepared in a glove box filled with argon (the oxygen content is less than or equal to 0.1 ppm, and the water content is less than or equal to 0.1 ppm).
In order to examine the influence of the electrolyte formula disclosed by the invention on the rate performance of the battery, rate performance tests are carried out on examples and comparative examples.
The sodium ion battery adopts a vanadium sodium phosphate battery for testing, the lithium ion battery adopts a lithium iron phosphate battery for testing, and the preparation process of the battery is as follows:
(1) adding 80wt% of vanadium sodium phosphate or lithium iron phosphate powder, 10wt% of conductive carbon and 10wt% of PVDF into N-methylpyrrolidone, and fully and uniformly mixing to obtain electrode slurry; and coating the electrode slurry on an aluminum foil, and carrying out vacuum overnight drying and cutting to obtain a wafer to obtain the cathode material.
(2) The test cell was obtained by assembling the positive electrode material, the electrolyte obtained in examples and comparative examples, the PP separator, and sodium/lithium metal in a 2032 type coin cell in a glove box filled with argon gas (oxygen content not more than 0.1 ppm, water content not more than 0.1 ppm).
The cell assembled by the electrolyte of the embodiment and the comparative example is tested for the rate capability at room temperature, and the specific test method comprises the following steps:
constant current charging and discharging are carried out in a Xinwei battery testing system at room temperature at different current densities, the discharging specific capacity of the battery under different multiplying powers is recorded, and the results are shown in table 1 by taking a lithium iron phosphate battery as an example.
TABLE 1 specific discharge capacity of lithium iron phosphate battery under different multiplying power
Figure 580242DEST_PATH_IMAGE001
Fig. 1 is a discharge curve diagram at 10C for lithium iron phosphate batteries of example 2, comparative example 1, comparative example 3, and comparative example 6.
As can be seen from table 1 and fig. 1, the lithium ion battery using the electrolyte formulation provided by the present invention can provide a specific discharge capacity of up to 122mAh/g at a high rate of 10C, and thus it can be confirmed that the additive of the present invention significantly improves the rate performance of the lithium ion battery.
Room temperature cycle performance tests were performed on lithium iron phosphate batteries assembled with the lithium ion electrolytes of example 2 and comparative example 1, and the specific test method was:
in a Xinwei battery testing system at room temperature, constant current charging and discharging are carried out at a current density of 1C in a voltage window of 2.5-4.2V, and the capacity retention rate of the battery after 1000 cycles is recorded, and the result is shown in figure 2.
As can be seen from fig. 2, after 1000 cycles at a current density of 1C, the capacity retention rate of the lithium iron phosphate battery to which the N, O-bis (trimethylsilyl) acetamide and vinylene carbonate additives were added was as high as 88% or more, compared to only 47% for comparative example 1.
In view of the above result, the optimized additive content is applied to the vanadium sodium phosphate battery, and the rate capability and the cycle performance of the vanadium sodium phosphate battery are also found to be obviously improved, so that the safety, the rate capability and the long cycle performance of the battery can be obviously improved when the electrolyte formula of the invention is applied to the electrolyte of the sodium (lithium) ion energy storage battery.

Claims (10)

1. A composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery is characterized by comprising an additive A and an additive B, wherein:
the mass ratio of the additive A to the additive B is 0.25-2: 0.5 to 2;
the additive A is an amide derivative containing silane or silicofluoric alkyl;
the additive B is one or more of vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate and difluoroethylene carbonate.
2. The composite electrolyte additive for improving the safety and the cycle performance of the sodium (lithium) ion energy storage battery according to claim 1, wherein the mass ratio of the additive A to the additive B is 0.25-1: 0.5 to 1.
3. The composite electrolyte additive for improving the safety and the cycle performance of a sodium (lithium) ion energy storage battery according to claim 1, wherein the additive A is an acetamide derivative containing a trimethylsilyl group, and the additive B is vinylene carbonate.
4. The composite electrolyte additive for improving the safety and cycling performance of a sodium (lithium) ion energy storage battery according to claim 3, characterized in that the additive A is N, O-bis (trimethylsilyl) acetamide.
5. An electrolyte comprising the composite electrolyte additive according to any one of claims 1 to 4, wherein the electrolyte is composed of 8 to 18wt% of a conductive salt, 80 to 90wt% of a solvent, 0.25 to 2wt% of an additive A, and 0.5 to 2wt% of an additive B, wherein:
the conductive salt is sodium salt or lithium salt;
the solvent is one or more of ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate and diethyl carbonate.
6. The electrolyte of claim 5, wherein the sodium salt is one or more of sodium hexafluorophosphate, sodium difluorosulfonylimide, sodium bistrifluoromethanesulfonimide, and sodium perchlorate, and the lithium salt is one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium bistrifluoromethanesulfonimide, lithium tetrafluoroborate.
7. The electrolyte of claim 6, wherein the sodium salt is sodium hexafluorophosphate in an amount of 13 wt%; the lithium salt is lithium hexafluorophosphate, and the content of the lithium salt is 13 wt%.
8. The electrolyte according to claim 5, wherein the solvent is a mixture of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of ethylene carbonate to ethyl methyl carbonate is 3: 7.
9. use of a composite electrolyte additive as claimed in any one of claims 1 to 4 in a sodium (lithium) ion battery.
10. Use of an electrolyte according to any one of claims 5 to 8 in a sodium (lithium) ion battery.
CN202210675463.2A 2022-06-15 2022-06-15 Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery Pending CN115084653A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115663288A (en) * 2022-12-20 2023-01-31 湖南钠能时代科技发展有限公司 Electrolyte for improving hard carbon cycle stability and application of electrolyte in energy storage sodium ion battery

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180019912A (en) * 2016-08-17 2018-02-27 솔브레인 주식회사 Nonaqueous electrolytic solution and lithium secondary battery
CN113130990A (en) * 2019-12-30 2021-07-16 深圳市研一新材料有限责任公司 Electrolyte and secondary battery using same
CN113745659A (en) * 2021-08-23 2021-12-03 合肥工业大学智能制造技术研究院 Composite high-safety electrolyte and lithium ion battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180019912A (en) * 2016-08-17 2018-02-27 솔브레인 주식회사 Nonaqueous electrolytic solution and lithium secondary battery
CN113130990A (en) * 2019-12-30 2021-07-16 深圳市研一新材料有限责任公司 Electrolyte and secondary battery using same
CN113745659A (en) * 2021-08-23 2021-12-03 合肥工业大学智能制造技术研究院 Composite high-safety electrolyte and lithium ion battery

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JIANG, R ET AL.: "An acetamide additive stabilizing ultra-low concentration electrolyte for long-cycling and high-rate sodium metal battery", ENERGY STORAGE MATERIALS, vol. 42, 30 November 2021 (2021-11-30), pages 370 - 379 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115663288A (en) * 2022-12-20 2023-01-31 湖南钠能时代科技发展有限公司 Electrolyte for improving hard carbon cycle stability and application of electrolyte in energy storage sodium ion battery

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