This application claims the benefit of Chinese Patent Application No. 202211083361.8, filed on Sep. 6, 2022. The entire disclosure of the application referenced above is incorporated herein by reference.
The information provided in this section is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.
The present disclosure relates to battery cells, and more particularly to battery cells for electric vehicles or other applications.
Electric vehicles (EVs) such as battery electric vehicles (BEVs), hybrid vehicles, and/or fuel cell vehicles include one or more electric machines and a battery system including one or more battery cells, modules and/or packs. A power control system is used to control charging and/or discharging of the battery system during charging and/or driving. Manufacturers of EVs are pursuing increased power density to increase the range of the EVs.
Lithium-ion battery (LIB) cells are currently used for high power density applications. All-solid-state battery (ASSB) cells have improved characteristics compared to LIB cells in terms of abuse tolerance, power capability and/or working temperature range.
A battery cell includes a continuous anode electrode comprising an anode current collector. A plurality of individual cathode electrodes comprise a cathode current collector, cathode active material arranged on opposite sides of the cathode current collector, and a first sulfide electrolyte layer arranged on the cathode active material. The continuous anode electrode is arranged in a zig-zag pattern and the plurality of individual cathode electrodes are arranged between adjacent alternating portions of the continuous anode electrode.
In other features, a highest point of the anode current collector minus a lowest point of the anode current collector is in a range from 1 μm to 20 μm. The continuous anode electrode further includes anode active material arranged on opposite sides of the anode current collector. The continuous anode electrode further comprises a second sulfide electrolyte layer arranged on the anode active material. The first sulfide electrolyte layer and the second sulfide electrolyte layer are selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide.
In other features, the anode active material includes a material selected from a group consisting of silicon, columnar silicon, silicon-containing alloys, and silicon-graphite mixture. The anode active material comprises a material selected from a group consisting of tin, aluminum, indium, and magnesium.
In other features, the cathode active material comprises one or more positive electroactive materials selected from a group consisting of LiCoO2, LiNixMnyCo1−x−yO2 (where 0≤x≤1 and 0≤y≤1), LiNixMn1−xO2 (where 0≤x≤1), Li1+xMO2 (where 0≤x≤1), LiMn2O4, LiNixMn1.5O4, LiFePO4, LiVPO4, LiV2(PO4)3, Li2FePO4F, Li3Fe3(PO4)4, Li3V2(PO4)F3, LiFeSiO4, and combinations thereof. The cathode active material is at least one of coated and doped. The first sulfide electrolyte layer is selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide.
A battery cell comprises a plurality of individual anode electrodes comprising an anode current collector. A continuous cathode electrode comprises a cathode current collector, cathode active material arranged on opposite sides of the cathode current collector at spaced intervals, and a first sulfide electrolyte layer arranged on the cathode active material and on the cathode current collector in between the cathode active material. The continuous cathode electrode is arranged in a zig-zag pattern and the plurality of individual anode electrodes are located between adjacent alternating portions of the continuous cathode electrode.
In other features, the plurality of individual anode electrodes further includes anode active material arranged on opposite sides of the anode current collector. The anode active material includes a material selected from a group consisting of a carbonaceous material, silicon, a transition metal, a metal oxide, a lithium metal, a lithium alloy metal, and combinations thereof.
In other features, the lithium alloy metal further comprises a material selected from a group consisting of tin, aluminum, indium, and magnesium. The cathode active material comprises one or more positive electroactive materials selected from a group consisting of LiCoO2, LiNixMnyCo1−x−yO2 (where 0≤x≤1 and 0≤y≤1), LiNixMn1−xO2 (where 0≤x≤1), Li1+xMO2 (where 0≤x≤1), LiMn2O4, LiNixMn1.5O4, LiFePO4, LiVPO4, LiV2(PO4)3, Li2FePO4F, Li3Fe3(PO4)4, Li3V2(PO4)F3, LiFeSiO4, and combinations thereof.
In other features, the positive electroactive materials are coated. The positive electroactive materials are coated with one or more materials selected from a group consisting of LiNbO3 and Al2O3. The positive electroactive materials are doped. The positive electroactive materials are doped with one or more materials selected from a group consisting of aluminum and magnesium.
In other features, the first sulfide electrolyte layer is selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide.
Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims and the drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.
The present disclosure will become more fully understood from the detailed description and the accompanying drawings, wherein:
In the drawings, reference numbers may be reused to identify similar and/or identical elements.
While the battery cells according to the present disclosure are described below in the context of a vehicle, the battery cells according to the present disclosure can be used in other applications.
All-solid-state battery (ASSB) cells using sulfide electrolyte have improved characteristics compared to current lithium-ion battery (LIB) cells in terms of abuse tolerance, power capability and/or working temperature range. However, the mechanical bendability of electrodes and/or separating layers is currently limited. In some ASSB prototype battery cells, uniform sheet-type electrodes are manufactured using a wet-coating process. A cathode coating is applied to opposite sides of a cathode current collector. After drying and calendaring, individual cathodes are punched into a sheet format. An anode coating is applied to opposite sides of an anode current collector. After drying and calendaring, an electrolyte coating is applied to the anode coatings. After drying and calendaring the electrolyte coating, the anode/electrolyte sheets are punched into a sheet format. The sheets including the cathodes and anodes are stacked one by one, which requires high accuracy of electrode positioning. This type of fabrication of ASSB cells is not very efficient, which increases the cost of the battery cells. Improper positioning may lead to reduced reliability.
The present disclosure relates to a continuous fabrication process for scalable all-solid-state battery (ASSB) using high-speed zig-zag stacking of continuous bendable anode electrodes (with individual cathode electodes) or continuous bendable cathode electrodes (with individual anode electrodes). In some examples, sulfide-based electrolyte is used.
In some examples, the cathode electrode is covered by a thin and uniform sulfide electrolyte layer using a slurry coating process. The cathode-supported sulfide dual layers are stacked between a continuous anode electrode using a battery zig-zag fabrication line. The fabrication methods described herein enable continuous sulfide-based ASSB fabrication with high production efficiency and improved reliability.
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In some examples, the continuous anode electrode 20 comprises a thin lamination layer with flexibility to enable bending. In some examples, the anode current collector 24 comprises copper foil. In some examples, the anode active material 28 comprises silicon. In some examples, the anode active material 28 comprises columnar silicon, silicon-containing alloys, or silicon-graphite mixture. In some examples, the anode active material 28 comprises materials with specific capacity greater than 800 mAh/g, such as tin, aluminum, indium, and magnesium. In some examples, the anode active material 28 comprises columnar silicon. In some examples, the anode active material has a thickness t1 in a range from 0 μm<t<=20 μm. In some examples, the anode active material has a thickness t in a range from 3 μm<t1<=8 μm. In some examples, outer surfaces of the anode current collector 24 are roughened to strengthen the adhesion between current collector and anode active material. In some examples, the anode current collector 24 has a thickness t2 in a range from 4 μm to 30 μm. In some examples, the anode current collector 24 has a thickness in a range from 12 μm to 16 μm (e.g., 14 μm).
In some examples, the electrolyte coating 90 (e.g., sulfide electrolyte) is applied to the anode active material to avoid potential fabrication short circuits and to enhance performance. In some examples, the sulfide electrolyte has a thickness t3 in a range from 0 μm<t3<=5 μm. In some examples, the sulfide electrolyte has a thickness t3 in a range from 0.5 μm<t3<=1.5 μm (e.g., 1 μm). In some examples, the continuous anode electrode 20 is impregnated with precursor solution of sulfide electrolyte followed by the solidification of sulfide electrolyte.
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While the preceding examples specified Li6PS5Br as an example of the sulfide electrolyte, other types of sulfide electrolyte can be used. In some examples, the sulfide electrolyte is selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide.
Examples of pseudobinary sulfide include Li2S—P2S5 system (Li3PS4, Li7P3S11 and Li9.6P3S12), Li2S—SnS2 system (Li4SnS4), Li2S—SiS2 system, Li2S—GeS2 system, Li2S—B2S3 system, Li2S—Ga2S3 system, Li2S—P2S3 system, and Li2S—Al2S3 system.
Examples of pseudoternary sulfide include Li2O—Li2S—P2S5 system, Li2S—P2S5—P2O5 system, Li2S—P2S5—GeS2 system, (Li3.25Ge0.25P0.75S4 and Li10GeP2S12), Li2S—P2S5—LiX system (where X═F, Cl, Br, I), (Li6PS5Br, Li6PS5Cl, L7P2S8I and Li4PS4I), Li2S—As2S5—SnS2 system, (Li3.633Sn0.633As0.166S4) system, Li2S—P2S5—Al2S3 system, Li2S—LiX—SiS2 system (where X═F, Cl, Br, I), 0.4LiI-0.6Li4SnS4 and Li11S12PS12.
Examples of pseudoquaternary sulfide include Li2O—Li2S—P2S5—P2O5 system, Li9.54Si1.74P1.44S11.7Cl0.3, Li7P2.9Mn0.1 S10.7I0.3 and Li10.35[Sn0.27Si1.08]P1.65S12.
As can be appreciated, the fabrication process can be extended to other types of battery cells (e.g., other types of solid-state batteries and/or liquid-based batteries) with thin anode and cathode supported dual layers.
In some examples, the cathode active material comprises one or more positive electroactive materials selected from a group consisting of LiCoO2, LiNixMnyCo1−x−yO2 (where 0≤x≤1 and 0≤y≤1), LiNixMn1−xO2 (where 0≤x≤1), Li1+xMO2 (where 0≤x≤1), LiMn2O4, LiNixMn1.5O4, LiFePO4, LiVPO4, LiV2(PO4)3, Li2FePO4F, Li3Fe3(PO4)4, Li3V2(PO4)F3, LiFeSiO4, and combinations thereof. In certain aspects, the positive solid-state electroactive particles 60 may be coated (for example, by LiNbO3 and/or Al2O3) and/or the positive electroactive material may be doped (for example, by aluminum and/or magnesium).
The foregoing description is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. The broad teachings of the disclosure can be implemented in a variety of forms. Therefore, while this disclosure includes particular examples, the true scope of the disclosure should not be so limited since other modifications will become apparent upon a study of the drawings, the specification, and the following claims. It should be understood that one or more steps within a method may be executed in different order (or concurrently) without altering the principles of the present disclosure. Further, although each of the embodiments is described above as having certain features, any one or more of those features described with respect to any embodiment of the disclosure can be implemented in and/or combined with features of any of the other embodiments, even if that combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and permutations of one or more embodiments with one another remain within the scope of this disclosure.
Spatial and functional relationships between elements (for example, between modules, circuit elements, semiconductor layers, etc.) are described using various terms, including “connected,” “engaged,” “coupled,” “adjacent,” “next to,” “on top of,” “above,” “below,” and “disposed.” Unless explicitly described as being “direct,” when a relationship between first and second elements is described in the above disclosure, that relationship can be a direct relationship where no other intervening elements are present between the first and second elements, but can also be an indirect relationship where one or more intervening elements are present (either spatially or functionally) between the first and second elements. As used herein, the phrase at least one of A, B, and C should be construed to mean a logical (A OR B OR C), using a non-exclusive logical OR, and should not be construed to mean “at least one of A, at least one of B, and at least one of C.”
In the figures, the direction of an arrow, as indicated by the arrowhead, generally demonstrates the flow of information (such as data or instructions) that is of interest to the illustration. For example, when element A and element B exchange a variety of information but information transmitted from element A to element B is relevant to the illustration, the arrow may point from element A to element B. This unidirectional arrow does not imply that no other information is transmitted from element B to element A. Further, for information sent from element A to element B, element B may send requests for, or receipt acknowledgements of, the information to element A.
Number | Date | Country | Kind |
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2022110833618 | Sep 2022 | CN | national |