CN114024024A - Electrolyte additive, application thereof and lithium metal battery - Google Patents

Electrolyte additive, application thereof and lithium metal battery Download PDF

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CN114024024A
CN114024024A CN202111299674.2A CN202111299674A CN114024024A CN 114024024 A CN114024024 A CN 114024024A CN 202111299674 A CN202111299674 A CN 202111299674A CN 114024024 A CN114024024 A CN 114024024A
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lithium
electrolyte
diaphragm
additive
metal battery
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姜智鹏
李晨
李永涛
张庆安
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Anhui University of Technology AHUT
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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
    • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
    • H01M10/0563—Liquid materials, e.g. for Li-SOCl2 cells
    • 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
    • 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

Abstract

The invention discloses an electrolyte additive, application thereof and a lithium metal battery thereof, belonging to the field of lithium metal batteries. The invention adopts the ionic compound consisting of alkali metal cations and anions with redox reversible reaction as the bifunctional electrolyte additive of the lithium metal battery, which can play a role of bifunctional protection, and on one hand, the low-concentration alkali metal cations have lower reduction potential and are easy to be absorbed at uneven positions on the surface of lithium, thereby enabling the lithium ions to be uniformly deposited and reducing the generation of lithium dendrites. On the other hand, the anion with redox reversible reaction can convert the dead lithium into soluble Li +, thereby continuously participating in the subsequent cycle process and greatly improving the utilization rate of the lithium. And the two effects are reversible, so that the electrolyte additive cannot be consumed in the process of multiple cycles, and the lithium metal battery can be continuously protected by only adding a small amount of the electrolyte additive.

Description

Electrolyte additive, application thereof and lithium metal battery
Technical Field
The invention relates to the technical field of lithium metal batteries, in particular to an electrolyte additive, application thereof and a lithium metal battery.
Background
The lithium ion battery has the advantages of high energy density and portability, and is applied in the fields of personal electronic equipment, electric automobiles and the like in a large scale. Among the known negative electrode materials, the lithium metal negative electrode has a specific mass of 3860mAh g-1The high capacity and the most negative potential (-3.040V vs standard hydrogen electrode) become the "holy cup" of the energy storage world and are of interest to researchers. Metallic lithium is used as a negative electrode for lithium sulfur batteries, lithium air batteries, lithium oxidation batteries, and the like, and is a hot spot in the research of high energy density secondary batteries. However, during the circulation process of the lithium metal negative electrode, dead lithium and lithium dendrite are generated, the electrolyte is consumed, and lithium deposition is not uniform, which causes the problems of poor safety and cycle performance of the lithium metal battery, and the like.
At present, in the report on lithium negative electrode protection, the solution to the accumulation of dead lithium is to essentially adjust the solid electrolyte interface layer (SEI film) to inhibit the growth of lithium dendrites, which will indirectly reduce the accumulation of dead lithium, such as tensing of the qinghua university, etc., by combining fluorinated co-solvent with slow-release additive to reasonably design sustainable SEI film, but in practical application, dead lithium still appears, making the battery have poor life (angelanddatechemie, 2019.59 (8): 3252-3257), and such fluorinated co-solvent additive can not maintain the performance after being consumed in the process of multiple cycles. Zhang Jiu, et al, in northern Western countries, USA, uses Cs + as an additive of lithium metal battery electrolyte, which has a self-smoothing effect on the surface by the mutual repulsion of charges of the same polarity, avoiding the generation of lithium dendrites, but this method cannot reduce the generation of dead lithium, and thus has a very limited improvement effect on lithium metal batteries (Journal of the American Chemical Society,2013,135 (11): 4450-4456.). Therefore, there is still a lack of a bifunctional electrolyte for a lithium metal battery, which can simultaneously perform the functions of uniformly depositing lithium ions and reducing dead lithium. In addition, all the currently used electrolyte additives are consumable additives, and the development of a sustainable electrolyte additive is urgently needed.
Through retrieval, the application with the application number of 2018110874024 discloses an electrolyte additive and an electrolyte of a lithium ion battery, wherein the electrolyte additive is a salt compound formed by halogen anions and metal cations, and the halogen anions are halogen element anions and/or pseudohalogen anions; the metal cation is one or more of alkali metal cation, alkaline earth metal cation, transition metal cation, main group metal cation and metalloid cation. The additive can perform specific physical and chemical reaction with lithium ion anode material lithium cobaltate in the battery circulation process, and a stable protective film is generated on an electrode interface, so that the collapse of an anode material structure is prevented. Application No. 2018114914444 discloses a functional additive for a high voltage lithium ion battery, a high voltage lithium ion battery electrolyte, and a high voltage lithium ion battery, the functional additive including a metal cation and an anion group; the metal comprises at least one of sodium, potassium, rubidium, cesium, francium, alkaline earth metal, an element of the first subgroup of the periodic table of chemical elements, or an element of the second subgroup of the periodic table of chemical elements, other than lithium; the anionic group includes at least one of a sulfur-containing anionic group, a boron-containing anionic group, or a cyanide-containing anionic group. Specific metal cations and anion groups in the functional additive jointly form a main frame of an SEI film, a layer of compact and uniform SEI film with low impedance can be formed on the surface of the anode of the lithium ion battery, the decomposition of an electrolyte solvent and a conductive lithium salt is inhibited, the anode material is prevented from being corroded by the electrolyte solvent or a decomposition byproduct of the conductive lithium salt, the structure of the anode material is stabilized, and the cycling stability of the battery is improved. However, there is not much attention paid to the above-mentioned problems of dead lithium, generation of lithium dendrites, non-uniform lithium deposition, and the like.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to provide an electrolyte additive aiming at the condition of poor safety and cycle performance of the conventional lithium metal battery caused by lithium dendrite, uneven deposition and the likeThe invention introduces an ionic compound (XY) consisting of alkali metal cations and anions with redox reversible reaction into electrolyte of the lithium metal battery as an electrolyte additive to obtain the corresponding lithium metal battery, wherein on one hand, the low-concentration alkali metal cations have lower reduction potential (less than E)Li/Li +) Therefore, the lithium ion is easy to be adsorbed on the uneven part of the lithium surface, so that the lithium ions are uniformly deposited, and the generation of lithium dendrites is reduced; on the other hand, an anion with redox reversible reaction can convert dead lithium into soluble Li+Thereby continuing to participate in the subsequent cycle process and greatly improving the utilization rate of lithium; and both effects are reversible, so that the electrolyte additive cannot be consumed in the process of multiple cycles, and the lithium metal battery can be continuously protected by only adding a small amount of the electrolyte additive.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the electrolyte additive comprises an ionic compound XY consisting of an alkali metal cation X and an anion Y having a redox reversible reaction. Further, the alkali metal cation X includes Na+、K+、Rb+、Cs+The anion Y having redox reversible reaction comprises I3 -、S2O3 2-、ClO2 -、NiO2 -One of (1) and (b). The following examples are not described in detail.
The application of the electrolyte additive is to add an ionic compound XY consisting of alkali metal cations X and anions Y with redox reversible reaction into the electrolyte of a lithium metal battery as the electrolyte additive. Further, the concentration of the ionic compound XY consisting of the alkali metal cation X and the anion Y having a redox reversible reaction in the electrolyte is 1mM-100mM, preferably 10 mM. Further, an ionic compound XY consisting of alkali metal cations X and anions Y with redox reversible reaction is combined with other components to be used as an electrolyte additive and added into the electrolyte of the lithium metal battery, and the other components comprise one or more of fluorinated carbonate, lithium nitrate, lithium polysulfide, lithium fluoride and vinylene carbonate. The following examples are not described in detail.
The lithium metal battery comprises a positive electrode material, a negative electrode material, a diaphragm and electrolyte, wherein the electrolyte comprises an electrolyte additive and matrix electrolyte, and the electrolyte additive comprises an ionic compound XY consisting of alkali metal cations X and anions Y with redox reversible reaction.
Further, the working current of the electrolyte was 0.01mA · cm-2～100mA·cm-2Preferably 1mA · cm-2。
Further, the matrix electrolyte of the lithium metal battery is selected from one or more of an ether electrolyte, an ester electrolyte, an ether ester mixed electrolyte and an ionic liquid electrolyte, and the following embodiments are not described in detail.
Further, the anode material of the lithium metal battery is one or more of lithium iron phosphate, lithium cobaltate, lithium titanate, nickel cobalt manganese, sulfur, oxygen, carbon dioxide and air; the negative electrode material of the lithium metal battery is metal lithium, and the following examples are not described in detail.
Further, the separator of the lithium metal battery is selected from a PP separator, a PE separator, a PP/PE/PP separator, and Al2O3Coating diaphragm, glass fiber diaphragm, PVDF diaphragm, PET/Al2O3One or more of the diaphragm, the cellulose diaphragm and the aramid diaphragm are not described in the following embodiments.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
at present, the inhibition of the growth of lithium dendrites is the most common method for lithium negative electrode protection, but dead lithium still appears in the practical application process, so that the battery has poor performance, and the electrolyte additive is consumed in the multi-cycle process of the battery, so that in order to realize a lithium metal battery capable of stably running, a bifunctional electrolyte additive which can uniformly deposit lithium ions and reduce the dead lithium and has a sustainable effect is urgently needed to be found. Thus, the present invention proposes a novel bifunctional electrolyte additive.
The low concentration of alkali metal cation has a lower reduction potential (less than E)Li/Li +) Therefore, the lithium ion is easy to be adsorbed on the uneven part of the lithium surface, so that the lithium ions are uniformly deposited, and the generation of lithium dendrites is reduced; in addition to this, the anion having redox reversible reaction can convert dead lithium (Li)2O or SEI-encapsulated Li fragments) into soluble Li+Thereby continuing to participate in the subsequent cycle process and greatly improving the utilization rate of lithium; and the two effects are reversible, and the reaction equation is as follows (for example, the cathode material of the battery is FePO)4)：
Figure BDA0003337937560000031
Figure BDA0003337937560000032
Such as I-And I3 -Reversible conversion between:
2Li+I-3＝2Li++3I-(1)
Figure BDA0003337937560000033
Figure BDA0003337937560000034
therefore, the electrolyte additive can not be consumed up in the process of multiple cycles, and the lithium metal battery can be continuously protected only by adding a small amount of the electrolyte additive, so that the process is simple, the cost is low, large-scale industrial production can be realized, and the commercial value is extremely high.
Drawings
Fig. 1 is a schematic diagram of cycle data of a lithium-lithium symmetric battery assembled in an ester electrolyte and using a single-element additive and without an electrolyte additive according to example 1 using the electrolyte additive proposed by the present invention.
Fig. 2 is a schematic diagram of cycle data of a lithium symmetric battery assembled in an ether electrolyte using the electrolyte additive according to example 2.
Fig. 3 is a schematic diagram of cycle data of a lithium-lithium symmetric battery assembled in example 3 by using the electrolyte additive proposed by the present invention to synergistically act with lithium nitrate in an ether electrolyte.
Fig. 4 is a coulombic efficiency test chart of a half cell assembled in example 4 using the electrolyte additive proposed by the present invention.
Fig. 5 is a graph of the cycle capacity of a lithium-lithium iron phosphate full cell assembled in example 9 using the electrolyte additive proposed by the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
In an inert atmosphere, 10mM of the ionic compound CsI consisting of the alkali metal cation and an element anion having a redox reversible reaction3Ethylene carbonate and diethyl carbonate dissolved in 1M lithium hexafluorophosphate (volume ratio1: 1) and (4) completely stirring and dissolving to prepare the electrolyte for standby. Injecting electrolyte to be used in the order of a positive battery case, a lithium metal pole piece, a diaphragm, the lithium metal pole piece and a negative battery case, assembling the lithium-lithium symmetrical battery in a glove box, and using 1mA cm-2The current density of (1) was tested in a cycling test, as shown in fig. 1, in the experimental group using the ester electrolyte with additives, the lithium symmetric battery was able to stably cycle for more than 150 hours and maintain a low overpotential, whereas the control group had a large overpotential and was unable to stably cycle (the electrolyte of control group 1 was a 1M solution of lithium hexafluorophosphate in ethylene carbonate and diethyl carbonate in a volume ratio of 1: 1, and the electrolyte of control group 2 was CsPF with only 10mM of additives6An additive; electrolyte of control 3 was iodine only additive, other cell structures and parameter settings were kept unchanged). The lithium sheet has no protruding tips and metallic lithium is uniformly deposited on the surface, thus illustrating that this compound can uniformly deposit lithium ions, form a smooth deposition layer, and reduce dead lithium, thereby increasing cycle efficiency.
Example 2
In an inert atmosphere, 10mM of the ionic compound CsI consisting of the alkali metal cation and an element anion having a redox reversible reaction31, 3-dioxolane and glycol dimethyl ether solution dissolved in 1M lithium bis (trifluoromethyl) sulfonyl imide, wherein the volume ratio is 1: 1(1MLiTFSIDOL/DME (v ═ 1: 1)). And after complete stirring and dissolution, preparing the electrolyte for standby. Injecting electrolyte to be used in the order of a positive battery case, a lithium metal pole piece, a diaphragm, the lithium metal pole piece and a negative battery case, assembling the lithium-lithium symmetrical battery in a glove box, and using 1mA cm-2The current density of (1M) bis (trifluoromethyl sulfonimide lithium dioxolane and ethylene glycol dimethyl ether solution in a volume ratio of 1: 1, and other cell structures and parameter settings were maintained constant, as shown in fig. 2, in the experimental group using the ether electrolyte with additives, the lithium-lithium symmetric cell was able to stably cycle for more than 150 hours and maintain a lower overpotential, while the control group had a larger overpotential and was unable to stably cycle (electrolyte of 1M bis (trifluoromethyl sulfonimide lithium dioxolane and ethylene glycol dimethyl ether solution, volume ratio 1: 1). Thereby illustratingThe additive also has a remarkable effect in ether electrolyte.
Example 3
In an inert atmosphere, 10mM of the ionic compound CsI consisting of the alkali metal cation and an element anion having a redox reversible reaction3Dissolving 1M lithium bis (trifluoromethyl) sulfonyl imide in 1, 3-dioxolane and glycol dimethyl ether solution, and adding LiNO with the mass fraction of 1%3The volume ratio is 1: 1(1MLiTFSiDOL/DME (v 1: 1) + 1% LiNO3) And after complete stirring and dissolution, preparing the electrolyte for standby. Injecting electrolyte to be used in the order of a positive battery case, a lithium metal pole piece, a diaphragm, the lithium metal pole piece and a negative battery case, assembling the lithium-lithium symmetrical battery in a glove box, and using 1mA cm-2The cycling test was performed, as shown in fig. 3, in the experimental group using the ester electrolyte with the additive, the lithium symmetric battery could stably cycle for more than 200 hours and maintain a lower overpotential, while the control group had a larger overpotential and could not stably cycle (the electrolyte of the control group 1 was a 1, 3-dioxolane and glycol dimethyl ether solution of 1M bis (trifluoromethyl) sulfonimide lithium in a volume ratio of 1: 1, and the electrolyte of the control group 2 was LiNO with only 1% by mass of the additive3An additive; the electrolyte of the control group 3 was an ionic compound CsI composed of only alkali metal cations and anions having redox reversible reaction3And (3) an additive. Other battery configurations and parameter settings remain unchanged). Thereby showing that the additive also has a remarkable effect in the ether electrolyte and showing that the additive can act synergistically with other additives.
Example 4
In an inert atmosphere, 10mM of the ionic compound CsI consisting of the alkali metal cation and an element anion having a redox reversible reaction3Dissolving the mixture in 1M ethylene carbonate and diethyl carbonate (volume ratio is 1: 1) of lithium hexafluorophosphate, and completely stirring and dissolving to prepare the electrolyte for standby. Injecting the electrolyte to be used in the order of the positive battery case, the copper sheet, the diaphragm, the lithium metal pole piece and the negative battery case, assembling the lithium-lithium symmetrical battery in the glove box, and using1mA cm-2The coulombic efficiency was obtained from the deposition and stripping amount of lithium per cycle, as shown in fig. 4, which is a coulombic efficiency test chart using the electrolyte additive, it was found that the stable charge and discharge cycle was 100 times, while the control had less than 40 times (the electrolyte of the control was 1M lithium hexafluorophosphate solution of ethylene carbonate and diethyl carbonate in a volume ratio of 1: 1, and other battery structures and parameter settings were maintained). Therefore, the electrolyte additive can obviously improve the lithium deposition stripping efficiency, thereby improving the performance of the lithium metal battery.
Example 5
The additive used in this embodiment has an addition concentration of 20mM, and is used in combination with lithium fluoride as an electrolyte additive when applied; the working current of the electrolyte in the applied lithium metal battery is 0.01 mA-cm-2Otherwise, the same procedure as in example 1 was repeated.
Example 6
The type of additive selected in this example was NaI3And the vinylene carbonate is combined to be used as an electrolyte additive together when the electrolyte is applied; the working current of the electrolyte in the applied lithium metal battery is 100mA cm-2The other conditions were the same as in example 2.
Example 7
Class KI of additive selected for use in this example3And when in application, the fluorinated carbonate is combined to be used as an electrolyte additive; the other conditions were the same as in example 2.
Example 8
The additive selected in this example is of the type RbI3When in use, the lithium polysulfide is combined to be used as an electrolyte additive; the other conditions were the same as in example 2.
Example 9
In an inert atmosphere, 10mM of the ionic compound CsI consisting of the alkali metal cation and an element anion having a redox reversible reaction3Dissolving the mixture in 1M ethylene carbonate and diethyl carbonate (volume ratio is 1: 1) of lithium hexafluorophosphate, and completely stirring and dissolving to prepare the electrolyte for standby. According to the positive battery shell and the lithium iron phosphateThe electrolyte for standby is injected into the sequence of the diaphragm, the lithium metal pole piece and the negative electrode battery shell, a lithium-lithium iron phosphate full battery is assembled in a glove box, and a cycle performance test is carried out under the multiplying power of 1C, as shown in figure 5, the lithium-lithium iron phosphate full battery using the electrolyte additive can stably circulate for more than 200 circles, and the capacity of a control group begins to attenuate after the circulation is less than 50 circles (the electrolyte of the control group is a 1M ethylene carbonate and diethyl carbonate solution of lithium hexafluorophosphate, the volume ratio is 1: 1, and the structure and parameter settings of other batteries are kept unchanged), which indicates that the electrolyte additive can obviously improve the cycle performance of the lithium metal battery.
Example 10
The concentration of the additive selected in the embodiment is 100mM, and the additive is combined with lithium nitrate to be used as an electrolyte additive when in application; the rest is the same as in example 9.
Example 11
The concentration of the additive selected in this example was 1mM, and the type of additive selected was Cs2S2O3The other conditions were the same as in example 9.
Example 12
The type of additive selected in this example was CsClO2The other conditions were the same as in example 9.
Example 13
The type of additive selected in this example is Cs2NiO2The other conditions were the same as in example 9.
As shown in example 1 and fig. 1, an ionic compound additive composed of alkali metal cations and anions having redox reversible reactions can significantly improve the cycle performance of a lithium-lithium symmetric battery in an ester electrolyte, thereby prolonging the service life of a lithium negative electrode.
As shown in example 2 and fig. 2, the ionic compound additive composed of alkali metal cations and anions having redox reversible reaction can significantly improve the cycle performance of the lithium-lithium symmetric battery in the ether electrolyte, thereby prolonging the service life of the lithium negative electrode.
As shown in example 3 and fig. 3, the ionic compound additive composed of alkali metal cations and anions having redox reversible reactions can act synergistically with other additives to significantly improve the cycle performance of lithium-lithium symmetric batteries, thereby prolonging the service life of lithium negative electrodes.
As shown in example 4 fig. 4, the ionic compound additive composed of an alkali metal cation and an anion having a redox reversible reaction can significantly improve the coulombic efficiency of the lithium negative electrode.
As shown in example 9, fig. 5, the additive of an ionic compound consisting of alkali metal cations and anions having a redox reversible reaction can significantly improve the life span and cycle performance of a lithium-lithium iron phosphate full cell.
In addition to the above examples, the ionic compound XY consisting of an alkali metal cation and an anion having a redox reversible reaction used in the present invention may be Na2S2O3，NaClO2，NaNiO2，K2S2O3，KClO2，KNiO2，Rb2S2O3Etc., are not described herein. The ionic compound composed of an alkali metal cation and an anion having a redox reversible reaction in the present invention is most preferably CsI3。
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (10)

1. An electrolyte additive, characterized in that: comprising an ionic compound XY consisting of an alkali metal cation X and an anion Y having a redox reversible reaction.
2. An electrolyte additive according to claim 1, wherein: alkali metal cation X packetInclude Na+、K+、Rb+、Cs+The anion Y having redox reversible reaction comprises I3 -、S2O3 2-、ClO2 -、NiO2 -One of (1) and (b).
3. The application of the electrolyte additive is characterized in that: an ionic compound XY composed of an alkali metal cation X and an anion Y having a redox reversible reaction is added to an electrolyte of a lithium metal battery as an electrolyte additive.
4. Use of an electrolyte additive according to claim 3, wherein: the concentration of the ionic compound XY consisting of the alkali metal cation X and the anion Y having a redox reversible reaction in the electrolyte is 1mM-100 mM.
5. Use of an electrolyte additive according to claim 3, wherein: and the ionic compound XY consisting of the alkali metal cations X and the anions Y with redox reversible reaction is combined with other components to be used as an electrolyte additive and added into the electrolyte of the lithium metal battery, and the other components comprise one or more of fluorinated carbonate, lithium nitrate, lithium polysulfide, lithium fluoride and vinylene carbonate.
6. A lithium metal battery comprises a positive electrode material, a negative electrode material, a diaphragm and electrolyte, and is characterized in that: the electrolyte comprises an electrolyte additive and a matrix electrolyte, the electrolyte additive comprising an ionic compound XY consisting of an alkali metal cation X and an anion Y having a redox reversible reaction.
7. A lithium metal battery according to claim 6, characterized in that: the working current of the electrolyte was 0.01 mA/cm-2～100mA·cm-2。
8. A lithium metal battery according to claim 6, characterized in that: the matrix electrolyte of the lithium metal battery is selected from one or more of ether electrolyte, ester electrolyte, ether ester mixed electrolyte and ionic liquid electrolyte.
9. A lithium metal battery according to claim 6, characterized in that: the positive electrode material of the lithium metal battery is one or more of lithium iron phosphate, lithium cobaltate, lithium titanate, nickel-cobalt-manganese ternary, sulfur, oxygen, carbon dioxide and air; the negative electrode material of the lithium metal battery is metal lithium.
10. A lithium metal battery according to claim 6, characterized in that: the lithium metal battery diaphragm is selected from PP diaphragm, PE diaphragm, PP/PE/PP diaphragm and Al2O3Coating diaphragm, glass fiber diaphragm, PVDF diaphragm, PET/Al2O3One or more of a diaphragm, a cellulose diaphragm and an aramid diaphragm.
CN202111299674.2A 2021-11-04 2021-11-04 Electrolyte additive, application thereof and lithium metal battery Withdrawn CN114024024A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114744190A (en) * 2022-03-22 2022-07-12 浙江南都电源动力股份有限公司 Additive for preventing partial lithium supplement excess of pre-lithiation negative electrode, method thereof and lithium ion battery
CN115425292A (en) * 2022-08-16 2022-12-02 华中科技大学 High-temperature-resistant electrolyte, secondary battery and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114744190A (en) * 2022-03-22 2022-07-12 浙江南都电源动力股份有限公司 Additive for preventing partial lithium supplement excess of pre-lithiation negative electrode, method thereof and lithium ion battery
CN115425292A (en) * 2022-08-16 2022-12-02 华中科技大学 High-temperature-resistant electrolyte, secondary battery and application thereof

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