Method for manufacturing long fiber pole piece and battery having long fiber pole piece

Abstract

The application provides a preparation method of a long-fiber pole piece and a battery with the long-fiber pole piece, and the preparation method comprises the following steps: preparing a pole piece spinning solution, wherein the pole piece spinning solution comprises a positive pole spinning solution and a negative pole spinning solution; preparing long-fiber filaments based on the pole piece spinning solution, wherein the long-fiber filaments comprise long-fiber positive pole filaments and long-fiber negative pole filaments; weaving the long-fiber filaments by using a weft loom to obtain long-fiber spunlaced fabrics, wherein the long-fiber spunlaced fabrics comprise long-fiber positive pole spunlaced fabrics and long-fiber negative pole spunlaced fabrics; and coating a composite impregnating solution on the long-fiber spunlaced fabrics, and drying the long-fiber spunlaced fabrics coated with the composite impregnating solution to obtain long-fiber pole pieces, wherein the long-fiber pole pieces comprise long-fiber positive pole pieces and long-fiber negative pole pieces. Since the substances forming the pole piece spinning solution have high flame retardance and conductivity, the long-fiber filaments have high flame retardance, the long-fiber pole pieces formed thereby have high flame retardance, combustion explosion under the condition of thermal runaway is prevented, and the safety performance of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a method for preparing long fiber electrodes and a battery having long fiber electrodes. Background Technology

[0002] With the increasing popularity of new energy vehicles, end users are demanding higher driving ranges. Major power battery manufacturers are racing to improve cell energy density, primarily focusing on high-nickel content and thinner foil materials. This has led to a decrease in the safety and power output of the power batteries themselves. Particularly in terms of collision safety, cells are prone to deformation and twisting during collisions, potentially causing internal short circuits and thermal runaway. Currently, there is a lack of safety measures at the cell level to address mechanical collisions. Because cells contain a large amount of low-flash-point solvents, they are highly susceptible to combustion and explosion under thermal runaway conditions; therefore, the flame-retardant properties of the electrode layer urgently need development. Summary of the Invention

[0003] The main objective of this invention is to provide a method for preparing long fiber electrodes and a battery having long fiber electrodes, so as to solve the problem that the increased energy density of the battery cell leads to low battery safety in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a method for preparing long fiber electrodes is provided, comprising: preparing an electrode spinning solution, wherein the electrode spinning solution includes a positive electrode spinning solution and a negative electrode spinning solution; preparing long fiber precursors based on the electrode spinning solution, wherein the long fiber precursors include long fiber positive electrode precursors and long fiber negative electrode precursors; weaving the long fiber precursors using a weft loom to obtain a long fiber fabric, wherein the long fiber fabric includes long fiber positive electrode fabric and long fiber negative electrode fabric; coating the long fiber fabric with a composite impregnation solution; and drying the long fiber fabric coated with the composite impregnation solution to obtain a long fiber electrode, wherein the long fiber electrode includes a long fiber positive electrode and a long fiber negative electrode.

[0005] Further, the preparation of the electrode spinning solution includes the preparation of a positive electrode spinning solution, wherein the positive electrode spinning solution includes at least one of the following: positive electrode active material, conductive agent, polymer resin, solid electrolyte, silicon oxide, aluminum oxide, calcium oxide, boron oxide, polyester, polyimide, nylon, copper, and nickel.

[0006] Further, the preparation of the electrode spinning solution includes the preparation of a negative electrode spinning solution, wherein the negative electrode spinning solution includes at least one of the following: a negative electrode active material, a conductive agent, a polymer resin, a solid electrolyte, polyethylene oxide, polyacrylonitrile long fiber, calcium oxide, silicon oxide, aluminum oxide, boron oxide, polyimide, copper, and nickel.

[0007] Furthermore, the composite impregnation solution includes at least one of PVDF-HFP, EP, LATP, and LLZO.

[0008] Furthermore, the positive electrode active material includes at least one of LiFePO4, LiNixCoyMnzO2, LiFexMnyPO4, LMR, and NCMA.

[0009] Furthermore, the negative electrode active material includes at least one of graphite, hard carbon, soft carbon, mesophase carbon microspheres, lithium metal, and metal alloys.

[0010] Furthermore, the conductive agent includes at least one of SP super carbon black, multi-walled carbon nanotubes, single-walled carbon nanotubes, and flake graphite.

[0011] Furthermore, the solid electrolyte includes at least one of LATP, LLZO, sulfides, halides, PEO, and HFP-PVDF.

[0012] Furthermore, at least one of Li5FeO4, Li2NiO2, Li2CO3 lithium supplementation additives or interface repair agents is added to the positive electrode active material.

[0013] Furthermore, in the step of preparing the positive electrode spinning solution, the positive electrode active material, conductive agent, and solid electrolyte are pretreated with silane hydrolysis before being added to the positive electrode spinning solution. Similarly, in the step of preparing the negative electrode spinning solution, the negative electrode active material, conductive agent, and solid electrolyte are pretreated with silane hydrolysis before being added to the negative electrode spinning solution.

[0014] Furthermore, in the steps of preparing long fiber positive electrode sheets and long fiber negative electrode sheets, before coating the long fiber positive electrode fabric and long fiber negative electrode fabric with the composite impregnation solution, the long fiber positive electrode fabric and long fiber negative electrode fabric are surface treated with silane hydrolysate and ammonium carbonate.

[0015] According to another aspect of the present invention, a battery having long fiber electrodes is provided. The long fiber electrodes include a long fiber positive electrode and a long fiber negative electrode, which are prepared by the above-described method for preparing long fiber electrodes. The battery includes a battery body, a long fiber positive electrode, a long fiber negative electrode, and a separator. The long fiber positive electrode is connected to the battery body; the long fiber negative electrode is connected to the battery body; and the separator is located between the long fiber positive electrode and the long fiber negative electrode.

[0016] Furthermore, the connection method between the tab of the long fiber positive electrode and the external connecting tab includes one of ultrasonication, riveting, mechanical pressing, and polymer conductive bonding, and / or, the connection method between the tab of the long fiber negative electrode and the external connecting tab includes one of ultrasonication, riveting, mechanical pressing, and polymer conductive bonding.

[0017] By applying the technical solution of this invention, long fiber precursors are prepared from the electrode spinning solution, and the resulting long fiber fabric is woven on a weft loom. The long fiber fabric has extremely high mechanical strength, and the resulting battery cell has high torsional stiffness and other high-strength physical structural characteristics, which reduces the thermal runaway problem caused by physical deformation. Furthermore, since the substances forming the electrode spinning solution have high flame retardancy and conductivity, the long fiber precursors prepared from the electrode spinning solution have strong flame retardancy. The resulting long fiber electrode has strong flame retardancy and strong conductivity, preventing combustion and explosion under thermal runaway conditions and improving the safety performance of the battery. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A schematic flowchart of a first embodiment of a method for preparing long fiber electrodes according to the present invention is shown;

[0020] Figure 2a , Figure 2b A schematic diagram of the structure of a second embodiment of the method for preparing long fiber electrodes according to the present invention is shown;

[0021] Figure 3 A schematic diagram of the structure of a third embodiment of the method for preparing long fiber electrodes according to the present invention is shown;

[0022] Figure 4 An enlarged schematic diagram at point A is shown in the third embodiment of the method for preparing long fiber electrodes according to the present invention;

[0023] Figure 5 A schematic diagram of the structure of a fourth embodiment of the method for preparing long fiber electrodes according to the present invention is shown;

[0024] Figure 6 An enlarged schematic diagram at point B is shown in the fourth embodiment of the method for preparing long fiber electrodes according to the present invention.

[0025] The above figures include the following reference numerals:

[0026] 100. Battery body;

[0027] 200. Long fiber negative electrode sheet; 210. Long fiber negative electrode precursor; 220. Long fiber negative electrode fabric;

[0028] 300. Long-fiber positive electrode sheet; 310. Long-fiber positive electrode precursor; 320. Long-fiber positive electrode fabric; 330. Composite impregnation solution;

[0029] 400. Diaphragm;

[0030] 10. Solid electrolyte; 20. Positive electrode active material; 30. SP carbon black conductive agent; 40. CNTS carbon nanotubes; 50. Negative electrode active material. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0035] Combination Figures 1 to 4 As shown in the figure, a method for preparing long fiber electrodes is provided according to a specific embodiment of the present invention.

[0036] Specifically, such as Figure 1As shown, the method for preparing long fiber electrodes includes preparing an electrode spinning solution, wherein the electrode spinning solution includes a positive electrode spinning solution and a negative electrode spinning solution; preparing long fiber precursors based on the electrode spinning solution, wherein the long fiber precursors include long fiber positive electrode precursors and long fiber negative electrode precursors; weaving the long fiber precursors using a weft loom to obtain a long fiber fabric, wherein the long fiber fabric includes long fiber positive electrode fabric and long fiber negative electrode fabric; coating the long fiber fabric with a composite impregnation solution; and drying the long fiber fabric coated with the composite impregnation solution to obtain long fiber electrodes, wherein the long fiber electrodes include long fiber positive electrode electrodes and long fiber negative electrode electrodes.

[0037] In this embodiment, long fiber precursors are prepared from the electrode spinning solution, and the resulting long fiber fabric is woven on a weft loom. The long fiber fabric has extremely high mechanical strength, and the resulting battery cell has high torsional stiffness and other high-strength physical structural characteristics, which reduces the thermal runaway problem caused by physical deformation. Furthermore, since the material forming the electrode spinning solution has high flame retardancy and conductivity, the long fiber precursors prepared from the electrode spinning solution have strong flame retardancy. The resulting long fiber electrode has strong flame retardancy and strong conductivity, preventing combustion and explosion under thermal runaway conditions and improving the safety performance of the battery.

[0038] Further, the preparation of electrode spinning solutions includes preparing a positive electrode spinning solution, wherein the positive electrode spinning solution includes at least one selected from the following: positive electrode active material, conductive agent, polymer resin, solid electrolyte, silicon oxide, aluminum oxide, calcium oxide, boron oxide, polyester, polyimide, nylon, copper, and nickel. The preparation of electrode spinning solutions also includes preparing a negative electrode spinning solution, wherein the negative electrode spinning solution includes at least one selected from the following: negative electrode active material, conductive agent, polymer resin, solid electrolyte, polyethylene oxide, polyacrylonitrile long fiber, calcium oxide, silicon oxide, aluminum oxide, boron oxide, polyimide, copper, and nickel. The positive electrode spinning solution and the negative electrode spinning solution are used to prepare long-fiber positive electrode precursor and long-fiber negative electrode precursor, respectively, and the substances contained in the positive electrode spinning solution and the negative electrode spinning solution are different. Adding positive and negative electrode active materials and conductive agents to the electrode spinning solution allows the long fiber precursor prepared from the electrode spinning solution to contain positive and negative electrode materials. The ion and electron transport distance of the long fiber electrode formed in this way is greatly shortened, and the power output and fast charging performance can be improved by more than 10%.

[0039] Furthermore, the composite impregnation solution includes at least one of PVDF-HFP, EP, LATP, and LLZO. The composite impregnation solution is used to impregnate the fibers of long-fiber spun fabrics with a sizing solution, which improves the bonding strength of the long-fiber spun fabrics, enhances their stiffness, and reduces their heat shrinkage ratio.

[0040] Furthermore, the positive electrode active material includes at least one of LiFePO4, LiNixCoyMnzO2, LiFexMnyPO4, LMR, and NCMA. The positive electrode active material is mainly used to provide the lithium source and energy.

[0041] Furthermore, the negative electrode active material includes at least one of graphite, hard carbon, soft carbon, mesophase carbon microspheres, metallic lithium, and metal alloys. The negative electrode active material functions to collect lithium sources and store energy.

[0042] Furthermore, the conductive agent includes at least one of SP super carbon black, multi-walled carbon nanotubes, single-walled carbon nanotubes, and flake graphite. The conductive agent increases the conductive contact between active materials and improves electronic conductivity. SP super carbon black is a commonly used and inexpensive conductive agent; multi-walled and single-walled carbon nanotubes can improve the high and low temperature performance of the product, enhance its thermal conductivity, and extend its cycle life; flake graphite can improve electronic conductivity and reduce the amount of conductive agent required.

[0043] Furthermore, the solid electrolyte includes at least one of LATP, LLZO, sulfides, halides, PEO, and HFP-PVDF. A solid electrolyte is a solid ionic conductor electrolyte with high safety, no leakage of toxic organic liquids, low flammability, non-volatility, thermal stability, and the ability to achieve higher power density and cycleability.

[0044] Furthermore, at least one of Li5FeO4, Li2NiO2, and Li2CO3 lithium replenishing additives or interface repair agents is added to the positive electrode active material. Li5FeO4, Li2NiO2, and Li2CO3 can pre-lithiate the electrode material, thereby improving battery life by replenishing lithium losses during cycling. When the battery capacity, health, and State of Harm (SOH) value decay to 80%, the Battery Management System (BMS) initiates high-voltage repair, which can automatically repair the interface and replenish active lithium losses.

[0045] Furthermore, in the step of preparing the positive electrode spinning solution, the positive electrode active material, conductive agent, and solid electrolyte undergo silane hydrolysis pretreatment before being added to the positive electrode spinning solution. Similarly, in the step of preparing the negative electrode spinning solution, the negative electrode active material, conductive agent, and solid electrolyte undergo silane hydrolysis pretreatment before being added to the negative electrode spinning solution. Silane hydrolysis pretreatment enhances the bonding strength between the inorganic and organic interfaces.

[0046] Furthermore, in the steps of preparing long-fiber positive and negative electrode sheets, before coating the long-fiber positive and negative electrode fabrics with the composite impregnation solution, the long-fiber positive and negative electrode fabrics are surface-treated with silane hydrolysis solution and ammonium carbonate. Silane hydrolysis pretreatment improves the bonding strength between the inorganic and organic interfaces.

[0047] According to another aspect of the present invention, a battery having long fiber electrodes is provided. The long fiber electrodes include a long fiber positive electrode and a long fiber negative electrode, which are prepared by the above-described method for preparing long fiber electrodes. The battery includes a battery body, a long fiber positive electrode, a long fiber negative electrode, and a separator. The long fiber positive electrode is connected to the battery body; the long fiber negative electrode is connected to the battery body; and the separator is located between the long fiber positive electrode and the long fiber negative electrode.

[0048] Specifically, the long-fiber spun electrode structure differs from traditional extrusion-coated electrodes. It is formed from a spinning melt containing positive and negative electrode active materials, conductive agents, polymer resins, solid electrolytes, silicon dioxide, aluminum oxide, calcium oxide, boron oxide, polyester, polyimide, nylon, pure copper, and pure nickel, creating long-fiber precursors which are then woven into long-fiber electrodes. The long-fiber spun electrode exhibits extremely high mechanical strength, and the resulting battery cell possesses high torsional stiffness and other high-strength physical structural characteristics. The torsional stiffness of the battery cell itself is increased by ≥50%, significantly reducing the risk of thermal runaway caused by physical deformation. Flame-retardant materials such as silicon dioxide, aluminum oxide, calcium oxide, boron oxide, and polyimide are specially added to the long-fiber spun electrode structure, giving the long-fiber spinning itself strong flame retardancy. This, in turn, ensures the flame retardancy of both the long-fiber electrode and the battery cell, achieving intrinsic safety for the battery cell. In the long-fiber spinning structure, carbon black and carbon nanotubes are added, and the spinning structure itself forms a conductive framework. This framework is used to prepare composite electrodes. Because the long-fiber composite framework has excellent 3D conductivity, the positive and negative electrode foil current collectors can be omitted, increasing energy density by ≥15%. During the long-fiber spinning process, positive and negative electrode active materials and solid electrolytes can be added to form a three-dimensional electron and ion pathway, which can greatly shorten the electron and ion transport distance, improve the high-power and fast-charging characteristics of the battery cell, and achieve >6C fast charging characteristics. Due to the inherent conductivity of the long fibers, the aluminum foil and copper foil current collector structures can be eliminated, greatly reducing the weight of the battery cell. The battery weight is reduced by more than 10% compared to conventional batteries.

[0049] Furthermore, a battery with long fiber electrodes is a long fiber reinforced power battery composed of long fiber positive electrode, long fiber negative electrode, polymer separator or semi-solid or solid electrolyte and shell structure; its assembly structure can be "Z" shaped stacking, roll-to-roll hot pressing, stacking and other structures, and the number of layers is determined by the required capacity of the battery, and can be set as needed from 0 to 100,000 layers. The long-fiber structure has a fiber length of 6-100mm, with a preferred range of 6-25mm; the fiber diameter is 0.05nm-400μm. This long-fiber conductive framework forms a three-dimensional electron-ion conductive network, improving fast-charging performance and power output by ≥20%. Under 6C fast charging conditions, the temperature rise is <25℃, and the overall cell temperature distribution difference is ≤3℃. Self-healing active materials are added to the long-fiber structure. When the battery capacity, health, and State of Harmony (SOH) value decay to 80%, the Battery Management System (BMS) sets a repair program. The specific repair stages are as follows: the upper limit of the cell charging voltage is adjusted to a usable voltage of 4.6V; the repair material is activated through high voltage to replenish lithium loss and repair the solid electrolyte interface. Simultaneously, the long-fiber inorganic structure possesses strong flame retardancy, improving cell safety at the electrode level and significantly enhancing safety characteristics compared to traditional cells.

[0050] Furthermore, the battery obtained using this preparation method possesses a high elastic modulus (≥230 GPa), a tensile strength (≥5000 MPa), and can increase the battery's weight energy density by up to 15% and its volumetric energy density by up to 10%. Battery systems or vehicle chassis manufactured using this battery exhibit a torsional stiffness ≥50000 N. With a torque of m / °, the battery prepared using this method can be assembled into a high-torsional-stiffness battery system or an integrated automotive chassis structure. This battery significantly improves energy density, power density, and fast-charging performance, while effectively preventing cell deformation and breakage during crash tests, greatly enhancing safety.

[0051] Furthermore, the connection methods between the tabs of the long-fiber positive electrode and the external connecting tabs include one of the following: ultrasonic bonding, riveting, mechanical pressing, and bonding with a conductive polymer. The connection methods between the tabs of the long-fiber negative electrode and the external connecting tabs also include one of the following: ultrasonic bonding, riveting, mechanical pressing, and bonding with a conductive polymer. The external connecting tab is a battery casing or an external module connector. The tab is a metallic conductor led out from the positive and negative terminals of the battery, and the connection methods between the tab and the external connecting tab are diverse.

[0052] As shown in Figure 2, in another embodiment of this application, the battery with long fiber electrodes includes a battery body 100, a long fiber negative electrode 200, a long fiber positive electrode 300, and a separator 400.

[0053] like Figure 3As shown, the positive electrode spinning solution is formed from solid electrolyte 10, positive electrode active material 20, SP carbon black conductive agent 30, CNTS carbon nanotubes 40, NMP, polyoxyethylene, polyacrylonitrile, silicon dioxide, aluminum oxide, calcium oxide, and boron oxide. The positive electrode spinning solution is spun to obtain long-fiber positive electrode precursor filament 310, in which the total content of ceramic components such as silicon dioxide, aluminum oxide, calcium oxide, and boron oxide is 5-10% wt. The long-fiber positive electrode precursor filament 350 is weft-woven on a loom to obtain long-fiber positive electrode fabric 320. The long-fiber positive electrode sheet 300 is composed of long-fiber positive electrode fabric 320 and a PVDF-HFP, EP, LATP, and LLZO composite impregnation solution 330.

[0054] like Figure 4 As shown, the negative electrode spinning solution is composed of solid electrolyte 10, negative electrode active material 50, SP carbon black conductive agent 30, CNTS carbon nanotubes 40, deionized water, polyoxyethylene, polyacrylonitrile, silicon dioxide, aluminum oxide, calcium oxide, and boron oxide. The negative electrode spinning solution is spun to obtain long-fiber negative electrode precursor filament 210, wherein the total content of ceramic components such as silicon dioxide, aluminum oxide, calcium oxide, and boron oxide is 5-10% wt. The long-fiber negative electrode precursor filament 210 is weft-woven on a loom to obtain long-fiber negative electrode fabric 220. The long-fiber negative electrode sheet 200 is composed of long-fiber negative electrode fabric 220 and a PVDF-HFP, EP, LATP, LLZO composite impregnation solution 330.

[0055] The battery body 100 has external dimensions of 30mm × 300mm × 102mm, adopts a square aluminum shell encapsulation structure, and has a capacity of 220Ah. In the preparation of the composite spinning solution, the positive electrode active material 20 is LiNi. 0.9 Co 0.05 Mn 0.05 O2, SP carbon black conductive agent 30, CNTS carbon nanotubes 40, NMP, polyoxyethylene, and polyacrylonitrile. The negative electrode active material 50 is made of graphite and silicon-oxygen-Pre-Li, with a content of 95%. Simultaneously, a PVDF-HFP and LATP composite impregnation solution was prepared at a ratio of 1:9, with a solid content of 10%. A 5µm composite impregnation solution was coated onto the positive and negative electrode long-fiber fabric using gravure printing. After drying, the finished positive and negative electrode long-fiber sheets were obtained.

[0056] Long fiber electrode rolls for both positive and negative electrodes are assembled into positive and negative working components through roll-to-roll hot pressing. The electrode sheets are then cut to the required size. The positive and negative working components are connected in parallel and then hot-pressed to form a battery cell core structure.

[0057] Following conventional cell packaging procedures, the core and outer casing are encapsulated to produce a battery with long fiber electrodes. The power battery manufactured using this method can achieve a gravimetric energy density of 350Wh / kg, a volumetric energy density of 770Wh / L, and a fast-charging capability of 6C.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing long fiber electrode sheets, characterized in that, include: Prepare an electrode spinning solution, wherein the electrode spinning solution includes a positive electrode spinning solution and a negative electrode spinning solution; Long fiber precursors are prepared based on the electrode spinning solution, wherein the long fiber precursors include long fiber positive electrode precursors and long fiber negative electrode precursors; The long fiber precursor is weft-woven using a weft loom to obtain a long fiber fabric, wherein the long fiber fabric includes a long fiber positive electrode fabric and a long fiber negative electrode fabric; A composite impregnation solution is coated onto the long-fiber spun fabric, and the long-fiber spun fabric coated with the composite impregnation solution is dried to obtain a long-fiber electrode sheet, wherein the long-fiber electrode sheet includes a long-fiber positive electrode sheet and a long-fiber negative electrode sheet; an electrode sheet spinning solution is prepared, including the preparation of a positive electrode spinning solution, wherein the positive electrode spinning solution includes a positive electrode active material, a solid electrolyte, silicon oxide, aluminum oxide, calcium oxide, boron oxide, polyester, polyimide, nylon, copper, and nickel; The preparation of electrode spinning solution includes the preparation of negative electrode spinning solution, wherein the negative electrode spinning solution includes negative electrode active material, solid electrolyte, polyethylene oxide, polyacrylonitrile long fiber, calcium oxide, silicon oxide, aluminum oxide, boron oxide, polyimide, copper and nickel. A battery with long fiber electrodes is a long fiber reinforced power battery composed of long fiber positive electrode, long fiber negative electrode, polymer separator or semi-solid or solid electrolyte, and shell structure.

2. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, The composite impregnation solution includes at least one of PVDF-HFP, EP, LATP, and LLZO.

3. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, The positive electrode active material includes LiFePO4.

4. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, The negative electrode active material includes at least one of graphite, hard carbon, soft carbon, mesophase carbon microspheres, lithium metal, and metal alloys.

5. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, The solid electrolyte includes at least one of LATP, LLZO, sulfides, halides, PEO, and HFP-PVDF.

6. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, A lithium-supplementing additive is added to the positive electrode active material, wherein the lithium-supplementing additive includes at least one of Li5FeO4, Li2NiO2, and Li2CO3.

7. The method for preparing long fiber electrode sheets according to claim 1, characterized in that, In the step of preparing long fiber positive electrode sheet and long fiber negative electrode sheet, before the long fiber positive electrode fabric and the long fiber negative electrode fabric are coated with the composite impregnation solution, the long fiber positive electrode fabric and the long fiber negative electrode fabric are surface treated with silane hydrolysate and ammonium carbonate.

8. A battery having long fiber electrodes, characterized in that, The long fiber electrode sheet includes a long fiber positive electrode sheet and a long fiber negative electrode sheet, which are prepared by the method for preparing long fiber electrode sheets according to any one of claims 1 to 7.

9. The battery with long fiber electrodes according to claim 8, characterized in that, The connection method between the tab of the long fiber positive electrode and the external connecting tab includes one of ultrasonication, riveting, mechanical pressing, and polymer conductive bonding, and / or the connection method between the tab of the long fiber negative electrode and the external connecting tab includes one of ultrasonication, riveting, mechanical pressing, and polymer conductive bonding.

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