CN115621417A - Preparation method of composite lithium cathode and application of composite lithium cathode in sulfide all-solid-state battery - Google Patents

Preparation method of composite lithium cathode and application of composite lithium cathode in sulfide all-solid-state battery Download PDF

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Publication number
CN115621417A
CN115621417A CN202210966476.5A CN202210966476A CN115621417A CN 115621417 A CN115621417 A CN 115621417A CN 202210966476 A CN202210966476 A CN 202210966476A CN 115621417 A CN115621417 A CN 115621417A
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lithium
negative electrode
composite
composite lithium
metal
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涂江平
李静儒
王秀丽
谷长栋
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Zhejiang University ZJU
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Zhejiang University ZJU
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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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 a preparation method of a composite lithium cathode and application of the composite lithium cathode in a sulfide all-solid-state battery. The composite lithium negative electrode takes metal lithium, a carbon material and a lithium-philic metal as raw materials, the raw materials are fully reacted at a high temperature, and the composite lithium negative electrode is obtained after cooling to the room temperature. LiC formed after lithiation of carbon materials 6 The lithium composite negative electrode can be used as a framework in the composite lithium negative electrode, so that the structural stability of the negative electrode can be effectively improved; the existence of the skeleton structure can also reduce the local current density and improve the uniformity of the deposition and stripping of the metal lithium. The lithium-philic alloy phase formed by alloying the lithium-philic metal and the lithium can ensure the rapid diffusion of the lithium and induce the uniform deposition of the lithium. LiC 6 And the alloy phase does not participate in electrochemical circulation, and only the metal lithium in the composite lithium negative electrode is used as an electrochemical active component. Meanwhile, the high (electrochemical) stability of the composite lithium negative electrode to the sulfide solid electrolyte contributes to the realization of good cycling stability.

Description

Preparation method of composite lithium cathode and application of composite lithium cathode in sulfide all-solid-state battery
Technical Field
The invention relates to the technical field of batteries, in particular to a preparation method of a composite lithium cathode and application of the composite lithium cathode in a sulfide all-solid-state battery.
Background
The continuous development of the current society makes people increasingly demand electric automobiles and portable electronic equipment. Accordingly, the demand for energy density of battery systems is also increasing. The organic liquid electrode liquid used by the traditional lithium ion battery has volatility and flammability, and safety problems such as burning, explosion and the like easily occur when the battery is overcharged or overdischarged. Solid-state batteries using a sulfide, oxide, or other solid-state electrolyte are receiving increasing attention due to superior safety performance, a wider usage temperature range, and a higher energy density. In contrast, sulfide electrolytes with higher ionic conductivities have greater commercial potential.
However, there are problems at the interface of the sulfide electrolyte and the metallic lithium negative electrode. Firstly, poor solid-solid interface contact between the solid electrolyte and the lithium metal leads to increase of internal resistance of the battery, which is not beneficial to full exertion of battery capacity; meanwhile, the growth of metal lithium dendrites is aggravated by a large number of pores, cracks, grain boundaries and other defects on the interface, so that the electrolyte sheet is cracked and even the battery is short-circuited. In addition, theoretical calculation and experimental results prove that the sulfide electrolyte has poor thermodynamic stability and can be spontaneously decomposed into Li when in contact with metallic lithium 2 S、Li 3 P and other substances form a loose decomposition product layer at the interface, which is not beneficial to the rapid conduction of lithium ions at the interface and impairs the cycle stability of the battery.
In order to improve the interfacial stability of the sulfide electrolyte and the negative electrode, studies have been made to use an alloy (e.g., indium, tin, silicon, etc.) instead of lithium metal to avoid the continuous decomposition of the electrolyte. Alternatively, an artificial solid electrolyte interface film is constructed on the surface of the metallic lithium to avoid direct contact between the metallic lithium and the sulfide electrolyte while inhibiting the growth of lithium dendrites. However, because the alloy has a higher potential for lithium metal, the use of the alloy in place of lithium metal can lose the energy density of the battery. The introduction of the artificial electrolyte interface layer often causes the preparation process of the battery to be complicated and is not easy to be applied commercially.
Therefore, finding a method which is simple and feasible and can effectively improve the interface stability of the negative electrode to the sulfide electrolyte and inhibit the growth of dendritic crystals is very important for the further development of the all-solid-state battery based on the sulfide electrolyte.
Disclosure of Invention
In view of this, the present invention provides a method for preparing a composite lithium negative electrode and its application in a sulfide all-solid-state battery. The skeleton structure in the composite lithium negative electrode is beneficial to maintaining the stability of the negative electrode structure and relieving the violent change of the negative electrode volume; and reduces local current density and promotes uniform stripping and deposition of lithium. Meanwhile, an alloy phase is introduced into the composite negative electrode, and the rapid diffusion of lithium and the uniform deposition of metal lithium are promoted by virtue of the high lithium ion diffusion coefficient and the high lithium affinity of the alloy phase.
In order to achieve the above object, the present invention provides the following technical solutions:
(1) Under the argon atmosphere with water and oxygen content not exceeding 0.1ppm, uniformly mixing and fully reacting metallic lithium, a carbon material and a lithium-philic metal at high temperature to obtain a uniform and molten mixture;
(2) Naturally cooling the molten mixture to room temperature in an argon atmosphere, and processing into composite lithium cathodes with different thicknesses;
(3) Matching the composite lithium negative electrode in the step (2) with a sulfide electrolyte to assemble the battery.
In the present invention, liC is formed by lithiating a carbon material 6 The lithium composite negative electrode can be used as a framework in the composite lithium negative electrode, so that the structural stability of the negative electrode can be effectively improved; the existence of the skeleton structure can also reduce the local current density and improve the uniformity of the deposition and stripping of the metal lithium. The lithium-philic alloy phase formed after the lithium-philic metal is alloyed with lithium can ensure the rapid diffusion of lithium and induce the uniform deposition of lithium. LiC 6 And the alloy phase does not participate in electrochemical circulation, and only the metal lithium in the composite lithium negative electrode is taken as an electrochemical active component. At the same time, the high (electrochemical) stability of the composite lithium negative electrode to the sulfide solid electrolyteContributing to achieving good cycle stability.
Preferably, the heating temperature in the step (1) is 300-400 ℃.
Preferably, the carbon material in the step (1) is one of natural graphite, mesocarbon microbeads and conductive carbon black, and the carbon material is lithiated into LiC 6 Then the anode is used as a framework structure inside the cathode; wherein the mass ratio of the carbon material to the metallic lithium is 1.
In the invention, the carbon material is preferably one of natural graphite, mesocarbon microbeads and conductive carbon black. Formation of LiC upon lithiation of carbon materials 6 The lithium composite negative electrode is used as a framework in the negative electrode, so that the structural stability of the lithium composite negative electrode and the stability of the contact between the negative electrode and an electrolyte interface in the circulating process are ensured. Meanwhile, the introduction of the framework structure also effectively reduces the local current density, can improve the uniformity of lithium stripping and deposition, and reduces the polarization of the battery.
Preferably, the lithium-philic metal in the step (1) is one of indium, tin, aluminum and zinc, so as to form Li by alloying with metallic lithium 13 In 3 、Li 22 Sn 5 (Li 17 Sn 4 )、Li 9 Al 4 Or alloys such as LiZn; wherein the mass ratio of the other metals to the metallic lithium is 1.
The lithium-philic metal is preferably one of indium, tin, aluminum and zinc to be alloyed with metallic lithium to form Li 13 In 3 、Li 22 Sn 5 (Li 17 Sn 4 )、Li 9 Al 4 Or an alloy phase such as LiZn. On the one hand, the alloy phase has a high lithium ion diffusion coefficient, and can promote lithium diffusion inside the electrode. On the other hand, the high lithium affinity of the alloy phase makes it possible to act as a preferential nucleation site for lithium, inducing the subsequent uniform deposition of metallic lithium.
In the present invention, the metallic lithium is in excess to ensure that only the metallic lithium is the active component during the electrochemical cycling; and LiC 6 And the alloy phase stably exists and does not participate in electrochemical reaction.
In the present invention, the mass ratio of the carbon material to the metallic lithium is preferably 1 to 3, more preferably 1 to 2; the mass ratio of the lithium-philic metal to the metallic lithium is preferably 1.
In the present invention, the process of mixing at high temperature is preferably:
mixing and fully stirring metal lithium and lithium-philic metal to obtain uniform and molten alloy A;
mixing and fully stirring a carbon material and the alloy A to obtain a uniform and molten mixture;
the mixing temperature is preferably 300-400 ℃, and more preferably 350-400 ℃;
in the step (2), after a uniform and molten mixture is obtained, naturally cooling the mixture to room temperature in an argon atmosphere; which is subsequently processed into a composite lithium negative electrode. In the present invention, the processing manner is preferably roll pressing; the thickness of the lithium composite negative electrode sheet is preferably 30 to 300 μm, more preferably 50 to 200 μm, and most preferably 50 to 100 μm.
Preferably, the processing method in step (2) is rolling.
Preferably, the thickness of the lithium composite negative electrode in the step (2) is 30 to 300 μm.
Preferably, the sulfide electrolyte in step (3) is Li 6 PS 5 Cl、Li 10 GeP 2 S 12 And the like.
The invention provides a composite lithium negative electrode prepared by the method.
The invention provides application of the composite lithium cathode prepared by the method in a sulfide solid-state battery.
The invention provides the composite lithium cathode prepared by the preparation method. And (3) obtaining a uniform mixture through the reaction of metallic lithium, a carbon material and a lithium-philic metal at a high temperature, and further processing after cooling to obtain the composite lithium negative electrode. LiC formed after lithiation of carbon materials 6 The lithium composite anode can be used as a stable framework in the composite lithium anode, so that the structural stability of the anode and the stability of the contact between the anode and a sulfide electrolyte interface in a circulating process can be ensured; the introduction of the skeleton structure also effectively reduces the local current densityAnd the uniformity of lithium stripping and deposition is improved. The lithium-philic metal forms an alloy phase after alloying with metallic lithium. The alloy phase has high lithium ion diffusion coefficient, can promote the rapid diffusion of lithium and relieve the formation of pores at an interface; meanwhile, the high lithium affinity of the alloy phase enables the alloy phase to be a preferential nucleation site during lithium deposition, and subsequent uniform deposition of lithium is induced. Meanwhile, the alloy phases distributed on the surface of the composite lithium cathode in a large quantity can improve the (electro) chemical stability of the cathode to sulfide electrolyte, and effectively relieve the occurrence of interface side reaction, thereby improving the cycling stability of the battery. During electrochemical cycling, only the metallic lithium inside the composite lithium negative electrode is the electrochemically active component, liC 6 The framework and the alloy phase can stably exist and do not participate in electrochemical reaction.
Compared with the prior art, the invention has the following advantages:
1. metals such as indium, tin, aluminum, and zinc are alloyed with lithium at high temperatures to form an alloy phase. The alloy phase has high lithium ion diffusion coefficient, can promote the rapid diffusion of lithium, and avoids the formation of macropores at the interface; meanwhile, the high lithium affinity of the alloy phase enables the alloy phase to be a preferential nucleation site during lithium deposition, and subsequent uniform deposition of lithium is induced.
2. In-situ lithiation of carbon materials to form LiC 6 As a stable skeleton structure, the structure stability in the circulation process of the composite cathode and the interface contact stability between the cathode and the electrolyte are ensured; the introduction of the skeleton structure also effectively reduces the local current density, can improve the uniformity of lithium stripping and deposition, and reduces the polarization of the battery.
3. The large amount of alloy phases on the surface of the composite lithium cathode can improve the (electro) chemical stability of the cathode to sulfide solid electrolyte and effectively relieve the occurrence of interface side reaction.
4. LiC 6 And the alloy phase does not participate in electrochemical circulation, and only the metal lithium in the composite lithium negative electrode is an electrochemical active component.
Drawings
Fig. 1 is an XRD spectrum of a composite lithium negative electrode prepared based on example 1;
FIG. 2 is a surface and cross-sectional topographical view and a corresponding energy spectrum plot of a composite lithium negative electrode prepared in example 1;
FIG. 3 is 0.2mA cm -2 Constant current charge and discharge curves for symmetrical cells assembled based on the composite lithium negative electrode prepared in example 1 at current density;
FIG. 4 is 0.2mA cm -2 After cycling at a current density for 20 cycles, the surface topography of the composite lithium negative electrode prepared in example 1 was plotted;
fig. 5 is an XRD spectrum of the composite lithium negative electrode prepared based on example 2.
Detailed Description
The present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
In the present invention, the starting materials used are all commercially available products well known in the art, unless otherwise specified.
Example 1
(1) Under the argon atmosphere with water and oxygen content not exceeding 0.1ppm, uniformly mixing metal lithium and metal tin at 360 ℃ to obtain alloy A; wherein the mass ratio of the metal lithium to the metal tin is 3;
(2) Mixing the mesocarbon microbeads and the alloy A at 360 ℃ under the argon atmosphere to obtain a uniform and molten mixture; wherein the mass ratio of the mesocarbon microbeads to the lithium metal is controlled to be 4;
(3) Naturally cooling the mixture to room temperature of 25 ℃ under argon atmosphere, and rolling until the thickness is 90 microns to obtain a composite lithium cathode;
(4) 160mg of Li are taken 6 PS 5 Placing Cl sulfide electrolyte powder into a tabletting mold with the diameter of 10mm, applying 380MPa pressure and maintaining the pressure for 3 minutes to obtain a solid electrolyte sheet;
(5) The composite lithium negative electrodes prepared in this example were respectively attached to Li 6 PS 5 And assembling symmetrical batteries on two sides of the Cl sulfide electrolyte sheet.
Fig. 1 is an XRD spectrum of the composite lithium negative electrode prepared in this example. As can be seen from FIG. 1, the metalTin alloyed with metallic lithium to form Li 22 Sn 5 An alloy phase; the mesophase carbon microspheres are fully lithiated to form LiC 6 (ii) a Meanwhile, a proper amount of metal lithium is also arranged in the composite lithium negative electrode.
Fig. 2 is a surface and cross-sectional topography and a corresponding energy spectrum of the composite lithium negative electrode prepared in this example. As can be seen from FIG. 2, the surface of the composite lithium negative electrode was flat, and LiC 6 The distribution in the depth direction is relatively uniform. And, li 22 Sn 5 Alloy phase surrounding LiC 6 Is distributed in a net shape.
Fig. 3 is a constant current charge and discharge curve of the symmetrical battery prepared in this example. Constant current charge and discharge test is carried out on the battery in a mode of first charge and second discharge, and the current density is set to be 0.2mA cm -2 The time for each charge or discharge was 1 hour. As can be seen from fig. 3, the battery can stably cycle for 400 hours or more, and the voltage plateau is stable.
FIG. 4 is a graph showing the color at 0.2mA cm -2 And (3) after circulating for 20 circles under the current density, the surface topography of the composite lithium cathode prepared by the example is shown. As can be seen from FIG. 4, after the cycle, the surface of the composite lithium negative electrode is flat, the metallic lithium is deposited into a compact sheet shape, and no dendrite is observed on the surface of the pole piece.
Example 2
(1) Under the argon atmosphere with water and oxygen content not exceeding 0.1ppm, uniformly mixing metal lithium and metal indium at 360 ℃ to obtain alloy A; wherein the mass ratio of the metal lithium to the metal indium is 3;
(2) Mixing the mesocarbon microbeads with the alloy A at 360 ℃ under the argon atmosphere to obtain a uniform and molten mixture; wherein the mass ratio of the mesocarbon microbeads to the lithium metal is 4;
(3) Naturally cooling the mixture to room temperature under argon atmosphere; rolling to a thickness of 72 microns to obtain a composite lithium cathode;
(4) 160mg of Li are taken 6 PS 5 Placing Cl sulfide electrolyte powder into a tabletting mold with the diameter of 10mm, applying 380MPa pressure and maintaining the pressure for 3 minutes to obtain a solid electrolyte sheet;
(5) The composite prepared in this exampleLithium negative electrodes are respectively attached to Li 6 PS 5 And assembling symmetrical batteries on two sides of the Cl sulfide electrolyte sheet.
Fig. 5 is an XRD spectrum of the composite lithium negative electrode prepared in this example. As is clear from FIG. 5, the metal indium forms Li by alloying with the metal lithium 13 In 3 An alloy phase; the mesophase carbon microspheres are fully lithiated to form LiC 6 (ii) a Meanwhile, a proper amount of metal lithium is also arranged in the composite lithium negative electrode.
As can be seen from the surface and cross-sectional morphology diagrams and the corresponding energy spectrograms of the composite lithium negative electrode prepared in the embodiment, the surface of the composite lithium negative electrode is relatively flat, and LiC is 6 The distribution in the depth direction is uniform. And, li 13 In 3 Alloy phase surrounding LiC 6 Is distributed in a net shape.
Constant current charge and discharge test is carried out on the battery in a mode of first charge and second discharge, and the current density is set to be 0.2mA cm -2 The time for each charge or discharge was 1 hour. The composite lithium negative electrode prepared in this example and Li 6 PS 5 The symmetrical cell obtained by matching Cl sulfide electrolyte can stably circulate for 200 hours.
Example 3
(1) Under the argon atmosphere that the water and oxygen content do not exceed 0.1ppm, evenly mixing metal lithium and metal tin at 360 ℃ to obtain alloy A; wherein the mass ratio of the metal lithium to the metal tin is 4;
(2) Mixing natural graphite and the alloy A at 360 ℃ under an argon atmosphere to obtain a uniform and molten mixture; wherein the mass ratio of the natural graphite to the metallic lithium is 7;
(3) Naturally cooling the mixture to room temperature under argon atmosphere; rolling to a thickness of 200 microns to obtain a composite lithium cathode;
(4) 150mg of Li are taken 10 GeP 2 S 12 Putting the sulfide electrolyte powder into a tabletting mold with the diameter of 10mm, applying 380MPa pressure and maintaining the pressure for 3 minutes to obtain a solid electrolyte sheet;
(5) The composite lithium negative electrodes prepared in this example were respectively attached to Li 10 GeP 2 S 12 Sulfide electricityAnd assembling symmetrical batteries on two sides of the electrolyte sheet.
Alloying metallic tin with metallic lithium to form Li 22 Sn 5 An alloy phase; natural graphite is fully lithiated to form LiC 6 (ii) a Meanwhile, a proper amount of metal lithium is also arranged in the composite lithium negative electrode.
The constant current charging and discharging test is carried out on the battery according to the mode of charging first and discharging later, and the current density is set to be 0.1mA cm -2 The time for each charge or discharge was 1 hour. The composite lithium negative electrode prepared in this example and Li 10 GeP 2 S 12 The symmetrical battery obtained by matching the sulfide electrolyte can stably circulate for 300 hours, and the polarization of the battery is stable.
The results of the above examples show that the method provided by the invention is simple and effective, and the composite lithium negative electrode is obtained by the reaction of the carbon material, other lithium-philic metals and metallic lithium at high temperature. LiC formed after lithiation of carbon materials 6 The lithium composite negative electrode is used as a stable framework in the composite lithium negative electrode, so that the structural stability of the negative electrode and the stability of the contact between the negative electrode and a sulfide electrolyte interface in the circulating process can be ensured; the introduction of the skeleton structure also effectively reduces the local current density, and is beneficial to improving the uniformity of lithium stripping and deposition. The lithium-philic metal forms an alloy phase after alloying with metallic lithium. The alloy phase has high lithium ion diffusion coefficient, can promote the rapid diffusion of lithium and relieve the formation of pores at an interface; meanwhile, the high lithium affinity of the alloy phase enables the alloy phase to become a preferential nucleation site during lithium deposition, and subsequent uniform deposition of lithium is induced. Meanwhile, the alloy phases distributed on the surface of the composite lithium cathode in a large quantity can improve the (electro) chemical stability of the cathode to sulfide electrolyte, and effectively relieve the occurrence of interface side reaction, thereby improving the cycling stability of the battery. The invention provides powerful technical support for the development of the next-generation lithium metal solid-state battery.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A preparation method of a composite lithium negative electrode is characterized by comprising the following steps:
(1) Under the argon atmosphere, uniformly mixing and fully reacting metallic lithium, a carbon material and a lithium-philic metal at high temperature to obtain a uniform and molten mixture;
(2) And naturally cooling the molten mixture in an argon atmosphere, and processing into composite lithium cathodes with different thicknesses.
2. The method according to claim 1, wherein in step (1), the atmosphere of argon gas containing not more than 0.1ppm of oxygen and water is used.
3. The method according to claim 1, wherein the mixing temperature at the high temperature in the step (1) is 300 to 400 ℃.
4. The preparation method according to claim 1, wherein in the step (1), the carbon material is one of natural graphite, mesocarbon microbeads and conductive carbon black, and the mass ratio of the carbon material to the metallic lithium is 1.
5. The preparation method according to claim 1, wherein in the step (1), the lithium-philic metal is one of indium, tin, aluminum and zinc, and the mass ratio of the lithium-philic metal to the metallic lithium is 1.
6. The method according to claim 1, wherein in the step (2), the processing method is rolling.
7. The method according to claim 1, wherein in the step (2), the thickness of the composite lithium negative electrode is 30 to 300 μm.
8. A composite lithium negative electrode produced by the production method according to any one of claims 1 to 7.
9. Use of the composite lithium negative electrode of claim 8 for the preparation of a sulfide all-solid-state battery.
10. The use according to claim 9, comprising: matching the composite lithium cathode with sulfide electrolyte to assemble a battery;
the sulfide electrolyte is Li 6 PS 5 Cl、Li 10 GeP 2 S 12 One kind of (1).
CN202210966476.5A 2022-08-12 2022-08-12 Preparation method of composite lithium cathode and application of composite lithium cathode in sulfide all-solid-state battery Pending CN115621417A (en)

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