Negative plate and battery

Abstract

The invention discloses a negative plate and a battery, and relates to the technical field of battery preparation. The negative electrode plate specifically comprises a negative electrode material, the negative electrode plate comprises the negative electrode material, the negative electrode material comprises an MOF derivative material, the mass ratio of the MOF derivative material in the negative electrode material is 1%-5%, and the specific surface area of the MOF derivative material is 200.0 m / g-1500.0 m / g. By introducing the MOF derivative material into the negative electrode material, the problems of limited capacity, slow ion migration, large volume change and the like of the existing graphite negative electrode can be solved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, and more particularly to a negative electrode and a battery. Background Technology

[0002] Lithium-ion batteries consist of a positive electrode, a negative electrode, a separator, and an electrolyte. Among these, the negative electrode material is the limiting factor in determining the fast-charging capability of a lithium-ion battery, and its specific capacity also significantly impacts the battery's energy density. Currently, the main commercially available negative electrode material is graphite, primarily synthetic graphite. Graphite possesses excellent chemical and thermal stability, a high lithium-ion diffusion coefficient, high electronic conductivity, and low cost. However, its specific capacity has almost reached its limit (theoretical specific capacity 372 mAh / g), and the small interlayer spacing of graphite's layered structure hinders lithium-ion diffusion and prolongs the lithium-ion fast-charging path. This also poses a risk of lithium plating during high-current charging, creating significant safety hazards for the cell and battery system. Therefore, optimizing conventional graphite to meet the demands for higher energy density and fast-charging performance is urgently needed. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a negative electrode sheet and a battery. By introducing MOF (Metal Organic Framework) derivative materials into the negative electrode material, the problems of limited capacity, slow ion migration, and large volume change of existing graphite negative electrodes can be solved, thereby meeting the requirements for higher energy density and fast charging performance.

[0004] The present invention provides a negative electrode sheet, the negative electrode sheet comprising a negative electrode material, the negative electrode material including a MOF-derived material, the mass percentage of the MOF-derived material in the negative electrode material being 1%-5%, and the specific surface area of ​​the MOF-derived material being 200.0 m² / g - 1500.0 m² / g.

[0005] In one embodiment of the present invention, the MOF-derived material is obtained by pyrolysis of a MOF precursor, the MOF precursor comprising metal ions and organic ligands.

[0006] In one embodiment of the present invention, the metal ion is selected from one of transition metal ions, lanthanide ions, and actinide ions.

[0007] In one embodiment of the present invention, the transition metal ion is selected from one or more of Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Mo, Cd, Au, Hg, V, Ti, and Sc.

[0008] In one embodiment of the present invention, the organic ligand is selected from ligands containing only C, H, and O elements, and ligands containing heteroatoms.

[0009] In one embodiment of the present invention, the ligand containing only C, H, and O elements is selected from one of carboxylic acid groups and benzene rings, and the ligand containing heteroatoms is selected from one of 2-methylimidazole and amino groups.

[0010] In one embodiment of the present invention, the pyrolysis is carried out under an inert atmosphere, the pyrolysis temperature is 350℃-800℃, the pyrolysis time is 1-4h, and the heating rate is 2-5℃ / min.

[0011] In one embodiment of the present invention, the negative electrode material further includes a carbon negative electrode material, wherein the carbon negative electrode material and the MOF-derived material together account for 96% of the total mass of the negative electrode material.

[0012] In one embodiment of the present invention, the carbon anode material includes one or more of graphite, hard carbon, and soft carbon.

[0013] The present invention also provides a battery comprising a positive electrode, a separator, an electrolyte, and a negative electrode as described above.

[0014] The present invention also provides a vehicle equipped with the battery described above.

[0015] Compared with existing technologies, the present invention has the following beneficial technical effects: This invention provides a negative electrode sheet and battery, optimizing the negative electrode material, which is a limiting factor in battery performance. This optimization primarily involves adding a certain amount of MOF-derived material to the negative electrode material. This material exhibits high specific capacity, serving as the main material for maximizing specific capacity and improving battery energy density. Furthermore, its unique porous structure, large specific surface area, and excellent conductivity accelerate the rapid migration of lithium ions within the material, improving electronic conductivity, enhancing fast-charging performance, and avoiding safety risks caused by lithium plating. Simultaneously, the porosity of the MOF-derived material mitigates the expansion and contraction caused by lithium ion insertion and extraction, resulting in reduced battery expansion force. This improves battery performance while lowering the mechanical requirements of the external support components during battery pack charging and discharging due to the expansion force. Detailed Implementation

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the examples. These examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0017] The present invention provides a negative electrode sheet, which includes a negative electrode material, wherein the negative electrode material includes a MOF-derived material, the mass percentage of the MOF-derived material in the negative electrode material is 1%-5%, and the specific surface area of ​​the MOF-derived material is 200.0 m² / g - 1500.0 m² / g.

[0018] In one embodiment of the present invention, the MOF-derived material is obtained by pyrolysis of a MOF precursor, which includes metal ions and organic ligands.

[0019] MOF-derived materials refer to a new type of porous functional material formed by using metal-organic framework (MOF) materials as precursors or sacrificial templates and transforming them through post-processing (mainly pyrolysis). During pyrolysis, the organic ligands in the MOF are partially carbonized into a conductive carbon network, while metal ions are reduced to elemental metals, oxides, or carbides, and highly dispersed in the carbon matrix. Simultaneously, the ordered porous structure of the original MOF framework is largely preserved or evolves into a new hierarchical porous structure. It is not a physical mixture of MOF and carbon materials, but rather a novel material formed through chemical transformation, integrating composition and structure.

[0020] MOF-derived materials perfectly combine the structural advantages of MOFs with the functional advantages of carbon materials / metal compounds: 1. Highly developed and adjustable hierarchical porous structure: Inheriting the regular microporous / mesoporous structure of MOF precursors, and potentially generating new pores during pyrolysis, the electrode exhibits several advantages: Shortened ion diffusion paths: Providing abundant transport channels for lithium ions, significantly improving the rate performance of the electrode. Increased electrode-electrolyte contact area: Promoting interfacial reactions and enhancing the utilization rate of active materials. Buffering volume changes: The pores effectively accommodate volume expansion / contraction during charge / discharge, improving electrode structural stability and cycle life.

[0021] 2. Excellent conductive network: Graphitized carbon, formed by the carbonization of organic ligands, transforms MOFs (Metal-Oxide-Fibers) that were originally poor insulators or conductors into good conductors. This creates a continuous electronic pathway through the electrode, reduces internal resistance, and improves electron transport efficiency, making it particularly suitable for high-current charge-discharge operations.

[0022] 3. Highly dispersed active sites: In MOFs, atomically dispersed metal ions embed into the carbon framework as nanoparticles or single atoms after pyrolysis. These metal species (such as Co, Ni, Fe, etc.) can serve as additional redox active centers, providing considerable pseudocapacitance and enhancing the overall capacity of the electrode. The carbon matrix prevents the aggregation of active nanoparticles, maintaining their high activity.

[0023] 4. Low density and high specific capacity: MOF-derived materials typically have low densities (e.g., 0.1–0.5 g / cm³, far lower than graphite's 2.2 g / cm³). Combined with their porous structure and additional active sites, their specific capacity often exceeds that of conventional graphite.

[0024] Therefore, applying MOF-derived materials in anode materials can solve the following problems: Due to the small interlayer spacing of graphite and slow ion diffusion (a bottleneck in fast charging), its theoretical capacity has reached its limit (an energy density bottleneck). Adding MOF-derived materials, with their highly developed and tunable hierarchical porous structure, can reduce the tortuosity of lithium-ion migration paths in the electrode, increase the lithium-ion insertion / extraction rate, improve battery rate performance, and alleviate the safety issue of lithium deposition under high current. Simultaneously, high porosity can improve the contact area between the electrolyte and the negative electrode, promoting rapid lithium-ion migration and enhancing battery rate performance. Furthermore, porosity can shorten the electrolyte wetting time in the negative electrode, reduce the aging time after electrolyte injection, and improve production efficiency. MOF-derived materials have high specific capacity, are lightweight, and have low density, far lower than graphite's 2.2 g / cm³. Therefore, adding MOF-derived materials can achieve both high battery capacity and high energy density, while also providing fast charging performance. Finally, the porous structure of MOF-derived materials can alleviate the volume changes caused by lithium-ion insertion / extraction, avoiding the potential risks of particle breakage and material deactivation caused by silicon material volume expansion, which would reduce battery capacity. At the same time, the reduction in battery expansion force also reduces the pressure on the external support components that may deform due to excessive battery expansion force when the battery is assembled into a battery pack.

[0025] In addition, the MOF-derived materials provided by this invention have a specific surface area of ​​200.0 m² / g - 1500.0 m² / g, for example, 200.0 m² / g, 400.0 m² / g, 600.0 m² / g, 800.0 m² / g, 1000.0 m² / g, and 1500 m² / g, ensuring that the material has moderate porosity, which can improve ion transport without causing serious side reactions due to excessive specific surface area. This is different from traditional porous carbon that pursues extremely high specific surface area. The pyrolysis transformation of MOF ensures that the MOF-derived materials possess the core characteristics of integrated structure and highly dispersed metal sites, which cannot be achieved by simply mechanically mixing other porous carbon and metal powders. Furthermore, setting the addition ratio of MOF-derived materials to 1%-5%, for example, 1%, 2%, 3%, 4%, and 5%, as a "performance enhancer" maximizes performance at the lowest cost, avoiding the negative effects of high addition amounts (such as excessively thick SEI films and processing difficulties).

[0026] In one embodiment of the present invention, the metal ion is selected from one of transition metal ions, lanthanide ions, and actinide ions.

[0027] In one embodiment of the present invention, the transition metal ion is selected from one or more of Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Mo, Cd, Au, Hg, V, Ti, and Sc.

[0028] In one embodiment of the present invention, the organic ligand is selected from ligands containing only C, H, and O elements, and ligands containing heteroatoms.

[0029] In one embodiment of the present invention, the ligand containing only C, H and O elements is selected from one of carboxylic acid group and benzene ring, and the ligand containing heteroatoms is selected from one of 2-methylimidazole and amino group.

[0030] Among them, metal ions can act as redox active sites, and organic ligands can adopt functional groups with the ability to store and transfer charge, which can accommodate more lithium ions and improve battery capacity.

[0031] In one embodiment of the present invention, the MOF-derived material is obtained by pyrolysis of the MOF precursor. The pyrolysis is carried out under an inert atmosphere, with the pyrolysis temperature ranging from 350°C to 800°C, for example, 350°C, 400°C, 500°C, 600°C, 700°C, or 800°C; the pyrolysis time ranging from 1 to 4 hours, for example, 1 hour, 2 hours, 3 hours, or 4 hours; and the heating rate ranging from 2 to 5°C / min, for example, 2°C / min, 3°C / min, 4°C / min, or 5°C / min. By adjusting process parameters such as the pyrolysis temperature and time, MOF-derived materials with pore sizes of different dimensions can be obtained. The MOF-derived material can have a hollow structure, a layered structure, etc., and its size ranges from nanometers to tens of micrometers, smaller than or equal to the size of graphite particles, thus preventing material agglomeration.

[0032] In one embodiment of the present invention, the negative electrode material further includes a carbon negative electrode material, and the carbon negative electrode material and the MOF-derived material account for 96% of the total mass of the negative electrode material, with the remainder being materials such as binders and conductive agents.

[0033] In one embodiment of the present invention, the carbon anode material includes one or more of graphite, hard carbon, and soft carbon.

[0034] The present invention also provides a battery comprising a positive electrode, a separator, an electrolyte, and a negative electrode as described above.

[0035] The present invention also provides a vehicle equipped with the battery described above.

[0036] The present invention will be further illustrated below with reference to the embodiments.

[0037] Example 1 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of Cd-MOF, a MOF precursor, and is added to the negative electrode material at a rate of 1%. Graphite, Cd-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Cd-MOF-derived material in the negative electrode material is 96%. After forming the slurry, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0038] Example 2 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Cd-MOF as a MOF precursor, and the amount added to the negative electrode material is 2%. Graphite, Cd-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the total mass percentage of graphite and Cd-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0039] Example 3 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Cd-MOF as a MOF precursor, and the amount added to the negative electrode material is 5%. Graphite, Cd-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the total mass percentage of graphite and Cd-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0040] Example 4 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Co-MOF as a MOF precursor, and the amount added to the negative electrode material is 1%. Graphite, Co-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Co-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0041] Example 5 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Co-MOF as a MOF precursor, and the amount added to the negative electrode material is 3%. Graphite, Co-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Co-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0042] Example 6 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Co-MOF as a MOF precursor, and the amount added to the negative electrode material is 5%. Graphite, Co-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Co-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0043] Example 7 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Zn-BTC as a MOF precursor, and the amount added to the negative electrode material is 1%. Graphite, Zn-BTC-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Zn-BTC-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0044] Example 8 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of Zn-BTC, a MOF precursor, and is added to the negative electrode material at an amount of 3%. Graphite, Zn-BTC-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Zn-BTC-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0045] Example 9 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Zn-BTC as a MOF precursor, and the amount added to the negative electrode material is 5%. Graphite, Zn-BTC-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Zn-BTC-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0046] Example 10 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of ZIF-67, a MOF precursor, and is added to the negative electrode material at a rate of 1%. Graphite, ZIF-67-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and ZIF-67-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0047] Example 11 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of ZIF-67, a MOF precursor, and is added to the negative electrode material at a rate of 4%. Graphite, ZIF-67-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and ZIF-67-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0048] Example 12 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of ZIF-67, a MOF precursor, and is added to the negative electrode material at a rate of 5%. Graphite, ZIF-67-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and ZIF-67-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0049] Example 13 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of Fe-MOF, a MOF precursor, and is added to the negative electrode material at a rate of 1%. Graphite, Fe-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Fe-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0050] Example 14 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material. The MOF-derived material is obtained by pyrolysis of Fe-MOF, a MOF precursor, and is added to the negative electrode material at a rate of 3%. Graphite, Fe-MOF-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Fe-MOF-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form the negative electrode sheet.

[0051] Example 15 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Cu-BTC as a MOF precursor, and the amount added to the negative electrode material is 2%. Graphite, Cu-BTC-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Cu-BTC-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0052] Example 16 A negative electrode sheet includes a negative electrode material, which includes a MOF-derived material obtained by pyrolysis of Cu-BTC as a MOF precursor, and the amount added to the negative electrode material is 4%. Graphite, Cu-BTC-derived material, SP, SBR, and CMC are mixed and dispersed in a certain proportion to form a slurry, wherein the sum of the mass percentages of graphite and Cu-BTC-derived material in the negative electrode material is 96%. After the slurry is formed, it is coated on copper foil and then rolled and stamped to form a negative electrode sheet.

[0053] Comparative Example 1 In the negative electrode of Comparative Example 1, except that MOF-derived materials were not added to the negative electrode material, all other processes were the same as in the Example.

[0054] The negative electrode sheets prepared in Examples 1-16 and Comparative Example 1 were then assembled into half-cells with lithium sheets, separators, and electrolytes. The specific surface area (BET), reversible capacity, and other related properties were tested. The test results are shown in Table 1.

[0055] Similarly, positive electrode material, SP, CNT, and PVDF are mixed and dispersed in a certain proportion to form a slurry, which is then coated onto aluminum foil. The slurry is then processed into a positive electrode sheet through rolling, slitting, and die-cutting processes. The negative electrode sheet, separator, and positive electrode sheet prepared in Examples 1-16 and Comparative Example 1 are stacked to form an electrode core. The positive and negative electrode tabs are then welded to the positive and negative electrode cover plates, placed in a casing, and injected with electrolyte. The battery is then prepared through formation, capacity testing, and other processes. The batteries prepared above are then tested for rate performance and fast-charge cycle performance: rate... Tests: The battery was placed at 25℃ and charged at 0.33C within the 2.0-3.75V voltage range. It was then discharged at 0.33C, 1C, 2C, 4C, and 6C, and the capacity retention rate was calculated at each rate. Fast charging cycle test: The battery was placed at 25℃ and subjected to a fast charging cycle test within the 2.0-3.75V voltage range (fast charging adopted a stepped charging strategy, with an average charging current of 4C and a discharging current of 1C). After 800 cycles, the capacity retention rate was calculated, and the results are shown in Tables 2 and 3.

[0056] Table 1. Specific surface area (BET) and reversible capacity test results of batteries prepared in Examples 1-16 and Comparative Example 1.

[0057] As can be seen from Table 1, compared with the negative electrode sheet without MOF-derived material in Comparative Example 1, the specific surface area (BET) and reversible capacity of the negative electrode sheets in Examples 1-16 were improved after adding MOF-derived material; and for the same MOF-derived material, the specific surface area (BET) and reversible capacity also increased with the increase of the amount added.

[0058] Table 2. Test results of rate discharge capacity retention of batteries prepared in Examples 1-16 and Comparative Example 1.

[0059] Table 3. Capacity retention and expansion force test results of fast-charging cycles (average rate 4C) prepared in Examples 1-16 and Comparative Example 1.

[0060] As shown in Tables 2 and 3, at different discharge rates, the capacity retention rates of the batteries containing MOF-derived materials in Examples 1-16 were all superior to those of the pure graphite battery in Comparative Example 1. Furthermore, the capacity retention rate increased with the increase in the amount of MOF-derived material added, indicating that the high porosity of the MOF-derived material shortens the migration distance of lithium ions in the electrode, improves the lithium ion insertion / extraction rate, and enhances the battery's rate performance. In fast charging cycles, the batteries in Examples 1-16 with added MOF-derived materials exhibited higher capacity retention rates than the pure graphite battery in Comparative Example 1, while the corresponding increase in expansion force was also less. This indicates that the porous structure of the MOF-derived material can alleviate the material volume changes caused by lithium ion insertion / extraction, reduce the changes in expansion force during charging and discharging, and facilitate the mechanical performance stress during subsequent battery pack assembly. However, the amount of MOF-derived material added should not be too high, as its large specific surface area may lead to a thicker SEI film on the negative electrode, deterioration of the electrode interface, and reduced battery performance.

[0061] As described above, the negative electrode sheet and battery provided by this invention optimize the negative electrode material, which is a limiting factor. This optimization primarily involves adding a certain amount of MOF-derived material to the negative electrode material. This material exhibits high specific capacity, serving as the main material for maximizing specific capacity and improving battery energy density. Furthermore, its unique pore structure, large specific surface area, and excellent conductivity accelerate the rapid migration of lithium ions within the material, improving electronic conductivity, enhancing fast-charging performance, and avoiding safety risks caused by lithium plating. Simultaneously, the porosity of the MOF-derived material alleviates the expansion and contraction caused by lithium ion insertion and extraction processes. This results in reduced battery expansion force, improving battery performance while lowering the mechanical performance requirements of the external support components during battery charging and discharging.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A negative electrode sheet, characterized in that, The negative electrode sheet contains a negative electrode material, which includes a MOF-derived material. The MOF-derived material accounts for 1%-5% of the mass of the negative electrode material, and the specific surface area of ​​the MOF-derived material is 200.0 m² / g - 1500.0 m² / g.

2. The negative electrode sheet according to claim 1, characterized in that, The MOF-derived material is obtained by pyrolysis of MOF precursors, which include metal ions and organic ligands.

3. The negative electrode sheet according to claim 2, characterized in that, The metal ion is selected from one of the transition metal ions, lanthanide ions, and actinide ions.

4. The negative electrode sheet according to claim 3, characterized in that, The transition metal ions are selected from one or more of Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Mo, Cd, Au, Hg, V, Ti, and Sc.

5. The negative electrode sheet according to claim 2, characterized in that, The organic ligand is selected from ligands containing only C, H, and O elements, or ligands containing heteroatoms.

6. The negative electrode sheet according to claim 5, characterized in that, The ligand containing only C, H, and O elements is selected from one of carboxylic acid groups and benzene rings, and the ligand containing heteroatoms is selected from one of 2-methylimidazole and amino groups.

7. The negative electrode sheet according to claim 2, characterized in that: The pyrolysis is carried out under an inert atmosphere, at a temperature of 350℃-800℃, for a time of 1-4 hours, and at a heating rate of 2-5℃ / min.

8. The negative electrode sheet according to claim 1, characterized in that: The anode material also includes a carbon anode material, and the combined mass percentage of the carbon anode material and the MOF-derived material in the anode material is 96%.

9. The negative electrode sheet according to claim 8, characterized in that: The carbon anode material includes one or more of graphite, hard carbon, and soft carbon.

10. A battery, characterized in that, It includes a positive electrode, a separator, an electrolyte, and a negative electrode as described in any one of claims 1-9.

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