Modified ultrathin lithium and preparation method and application thereof

Abstract

The invention discloses modified ultrathin lithium as well as a preparation method and application thereof. The modified ultrathin lithium provided by the invention comprises metal lithium and a doping agent doped in the metal lithium, the dopant is selected from metals having an electronegativity greater than the electronegativity of the metal lithium. The modified ultrathin lithium provided by the invention is used as the anode material of the lithium battery, so that the stability in dry air is remarkably improved, the reaction activity of the metal lithium is effectively reduced, the side reaction of an anode interface in the cycle process of the battery is inhibited, and the cycle life of the battery is remarkably prolonged. And on the other hand, the ultrathin lithium modification method provided by the invention is simple in preparation method and has very strong industrialization potential.

Description

Technical Field

[0001] This invention relates to the technical field of lithium batteries, specifically to a modified ultrathin lithium battery, its preparation method, and its applications. Background Technology

[0002] Lithium metal has become the preferred anode material for designing high-energy-density batteries due to its advantages of high energy density (3860 mAh / g) and low electrochemical potential (-3.04 V).

[0003] However, there are many challenges in the commercial application of lithium metal anodes, mainly due to the instability of the high reactivity of lithium metal in the electrolyte, which leads to problems such as the formation of a fragile and uneven SEI at the battery anode interface, lithium dendrite growth, and electrolyte decomposition.

[0004] Current research focuses on developing three-dimensional structural bodies, surface protective layers, novel electrolytes or additives to enhance SEI, and applying solid-state and polymer electrolytes to prevent side reactions.

[0005] While these methods improve the stability of lithium metal electrodes, they do not effectively improve battery cycle performance at high current densities. Summary of the Invention

[0006] The purpose of this invention is to provide a modified ultrathin lithium, its preparation method, and its applications. The modified ultrathin lithium provided by this invention significantly improves the stability of lithium-ion batteries in dry air (relative humidity <5%), effectively reduces the reactivity of metallic lithium, suppresses side reactions at the anode interface during battery cycling, and significantly improves battery cycle life. Furthermore, the ultrathin lithium modification method provided by this invention is simple to prepare and has strong industrialization potential.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A first aspect of the present invention is to provide a modified ultrathin lithium, the modified ultrathin lithium comprising metallic lithium and a dopant doped in the metallic lithium;

[0009] The dopant is selected from metals with electronegativity greater than that of lithium metal.

[0010] As a preferred implementation method,

[0011] The dopant is selected from at least one metal selected from beryllium, magnesium, aluminum, calcium, scandium, titanium, vanadium, chromium, manganese, iron, nickel, cobalt, copper, zinc, gallium, germanium, yttrium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, indium, tin, antimony, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, hafnium, tantalum, tungsten, osmium, iridium, platinum, gold, mercury, lead, bismuth, actinium, proton, thorium, neptunium, uranium, americium, plutonium, and curium; preferably at least one metal selected from tin, silver, or indium.

[0012] In a preferred embodiment, the thickness of the modified ultrathin lithium is ≤100µm.

[0013] As a preferred implementation method,

[0014] Preferably, the thickness of the modified ultrathin lithium is 10–50 μm; more preferably, it is 10–30 μm. For example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, or 50 μm.

[0015] In a preferred embodiment, the dopant is uniformly dispersed in the modified ultrathin lithium, serving as a preferential nucleation site for lithium and inducing uniform lithium deposition.

[0016] As a preferred implementation method,

[0017] In the modified ultrathin lithium, the molar ratio of dopant to lithium metal is 0.001% to 10.0%:1; preferably, the molar ratio of dopant to lithium metal is 0.1% to 1%:1; for example, 0.001%:1, 0.1%:1, 0.2%:1, 0.3%:1, 0.4%:1, 0.5%:1, 0.6%:1, 0.7%:1, 0.8%:1, 0.9%:1, 1.0%:1, 1.1%:1, 1.2%:1, 1.3%:1, 1.4%:1, 1.5%:1, 1.6%:1, 1.7%:1. 1.8%: 1, 1.9%: 1, 2.0%: 1, 2.1%: 1, 2.2%: 1, 2.3%: 1, 2.4%: 1, 2.5%: 1, 2.6%: 1, 2.7%: 1, 2.8%: 1, 2.9%: 1, 3.0%: 1, 3.1%: 1, 3.2%: 1, 3.3%: 1, 3.4%: 1, 3.5%: 1, 3.6%: 1, 3.7%: 1, 3.8%: 1, 3.9%: 1, 4.0%: 1, 4.1%: 1, 4.2%: 1, 4.3%: 1, 4.4%: 1, 4.5%: 1. 4.6%: 1. 4.7%: 1. 4.8%: 1. 4.9%: 1. 5.0%: 1. 5.1%: 1. 5.2%: 1. 5.3%: 1. 5.4%: 1. 5.5%: 1. 5.6%: 1. 5.7%: 1. 5.8%: 1. 5.9%: 1. 6.0%: 1. 6.1%: 1. 6.2%: 1. 6.3%: 1. 6.4%: 1. 6.5%: 1. 6.6%: 1. 6.7%: 1. 6.8%: 1. 6.9%: 1. 7.0%: 1. 7.1%: 1. 7.2%: 1. 7.3% %: 1, 7.4%: 1, 7.5%: 1, 7.6%: 1, 7.7%: 1, 7.8%: 1, 7.9%: 1, 8.0%: 1, 8.1%: 1, 8.2%: 1, 8.3%: 1, 8.4%: 1, 8.5%: 1, 8.6%: 1, 8.7%: 1, 8.8%: 1, 8.9%: 1, 9.0%: 1, 9.1%: 1, 9.2%: 1, 9.3%: 1, 9.4%: 1, 9.5%: 1, 9.6%: 1, 9.7%: 1, 9.8%: 1, 9.9%: 1, 10.0%: 1.

[0018] A second aspect of the present invention is to provide a method for preparing modified ultrathin lithium according to the first aspect of the present invention, comprising the following steps:

[0019] (1) In a glove box filled with protective gas, metallic lithium is melted in a crucible; a dopant is added to the molten metallic lithium and melted to obtain a lithium-dopant mixture;

[0020] (2) After homogenizing the lithium-doped mixture, load the lithium-doped mixture onto the substrate and cool it to obtain modified ultrathin lithium.

[0021] As a preferred implementation method,

[0022] Step (1), the protective gas is argon; and / or,

[0023] The melting temperature is 180–400°C; for example: 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, 360°C, 370°C, 380°C, 390°C, 1, 400°C; and / or,

[0024] The molar ratio of dopant to lithium metal is 0.001% to 10.0%:1; preferably, the molar ratio is 0.1% to 1%:1; for example, 0.001%:1, 0.1%:1, 0.2%:1, 0.3%:1, 0.4%:1, 0.5%:1, 0.6%:1, 0.7%:1, 0.8%:1, 0.9%:1, 1.0%:1, 1.1%:1, 1.2%:1, 1.3%:1, 1.4%:1, 1.5%:1, 1.6%:1, 1.7%:1, 1.8%:1. 1.9%: 1, 2.0%: 1, 2.1%: 1, 2.2%: 1, 2.3%: 1, 2.4%: 1, 2.5%: 1, 2.6%: 1, 2.7%: 1, 2.8%: 1, 2.9%: 1, 3.0%: 1, 3.1%: 1, 3.2%: 1, 3.3%: 1, 3.4%: 1, 3.5%: 1, 3.6%: 1, 3.7%: 1, 3.8%: 1, 3.9%: 1, 4.0%: 1, 4.1%: 1, 4.2%: 1, 4.3%: 1, 4.4%: 1, 4.5%: 1, 4.6 %: 1, 4.7%: 1, 4.8%: 1, 4.9%: 1, 5.0%: 1, 5.1%: 1, 5.2%: 1, 5.3%: 1, 5.4%: 1, 5.5%: 1, 5.6%: 1, 5.7%: 1, 5.8%: 1, 5.9%: 1, 6.0%: 1, 6.1%: 1, 6.2%: 1, 6.3%: 1, 6.4%: 1, 6.5%: 1, 6.6%: 1, 6.7%: 1, 6.8%: 1, 6.9%: 1, 7.0%: 1, 7.1%: 1, 7.2%: 1, 7.3%: 1. 7.4%: 1. 7.5%: 1. 7.6%: 1. 7.7%: 1. 7.8%: 1. 7.9%: 1. 8.0%: 1. 8.1%: 1. 8.2%: 1. 8.3%: 1. 8.4%: 1. 8.5%: 1. 8.6%: 1. 8.7%: 1. 8.8%: 1. 8.9%: 1. 9.0%: 1. 9.1%: 1. 9.2%: 1. 9.3%: 1. 9.4%: 1. 9.5%: 1. 9.6%: 1. 9.7%: 1. 9.8%: 1. 9.9%: 1. 10.0%: 1.

[0025] As a preferred implementation method,

[0026] Step (2),

[0027] The homogenization temperature is 180–400℃; for example: 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, 260℃, 270℃, 280℃, 290℃, 300℃, 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, 380℃, 390℃, 400℃; and / or,

[0028] The homogenization time is 0.5 to 6 hours; for example: 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h, 5h, 5.5h, 6h.

[0029] As a preferred implementation method,

[0030] The substrate is selected from copper foil; preferably, the loading method is to impregnate one side of the copper foil with the homogenized lithium-doped agent mixture; and / or,

[0031] The thickness of the lithium-doped agent mixture loaded on the substrate after homogenization treatment is ≤100um; preferably 10-50um; more preferably 10-30um.

[0032] In this invention, wetting refers to conventional methods of loading liquid onto a substrate, such as dipping one side of a copper foil into the homogenized lithium-doped solution, which loads the lithium-doped solution onto the copper foil substrate.

[0033] As a more preferred embodiment, the method for preparing modified ultrathin lithium includes the following steps:

[0034] S1. Prepare the experimental environment. Conduct the lithium doping experiment in a glove box filled with argon gas to prevent lithium from reacting with moisture and oxygen in the air.

[0035] S2, Melting metallic lithium. A suitable mass of metallic lithium is placed in a nickel crucible and slowly heated at a certain temperature until the lithium is completely melted. Preferably, the mass of metallic lithium is 1–10 g, and the temperature is 180–400 °C.

[0036] S3, Doped Metal. The doped metal (in the form of a large metal wire) is immersed in molten lithium until it is completely melted.

[0037] S4, Homogenization treatment. The mixture of doped metal and molten lithium is ultrasonically stirred and kept at 180-400℃ for 1-4 hours to ensure that the doped metal is completely and uniformly dispersed in the lithium.

[0038] S5, Dip-coating foil. One side of the copper foil is dipped in molten lithium containing doped metal. Preferably, the thickness of the ultrathin lithium is controlled to be ≤100um; more preferably, the thickness is 10 to 30um; for example: 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, 50um.

[0039] S6, Cutting the foil. Cut the coated foil into circular pieces of the appropriate diameter to serve as electrodes. Preferably, the anode diameter of the coin cell is 10-16 mm.

[0040] The aforementioned foils refer to copper foil and modified ultrathin lithium layer, where the copper foil is used as the current collector in the lithium battery and the modified ultrathin lithium layer is used as the anode in the lithium battery.

[0041] A third aspect of the present invention is to provide the application of modified ultrathin lithium as an anode material for lithium batteries according to the first aspect of the present invention.

[0042] When providing modified ultrathin lithium as a lithium battery anode material in this invention, the commonly used electrolyte, separator material, etc. are all existing conventional battery materials, and the battery can be assembled using existing commonly used assembly methods.

[0043] The beneficial effects of this invention are as follows:

[0044] On the one hand, the modified ultrathin lithium electrode significantly improves the stability in dry air (relative humidity <5%), effectively reduces the reactivity of metallic lithium, suppresses the occurrence of side reactions at the anode interface during battery cycling, and significantly improves the battery cycle life.

[0045] On the other hand, the ultrathin lithium modification method provided by this invention is simple to prepare and has strong industrialization potential. Attached Figure Description

[0046] Figure 1 This is an SEM image of the interface of the modified ultrathin lithium obtained in Example 1 of the present invention;

[0047] Figure 2 This is a data diagram of the pure ultrathin lithium symmetric battery prepared in Comparative Example 1 of this invention;

[0048] Figure 3 This is a data diagram of the modified ultrathin lithium symmetric battery prepared in Example 1 of the present invention;

[0049] Figure 4 This is a data diagram of the modified ultrathin lithium symmetric battery prepared in Example 2 of the present invention;

[0050] Figure 5 This is a data graph of the modified ultrathin lithium symmetric battery prepared in Example 3 of the present invention;

[0051] Figure 6 This is a data graph of the modified ultrathin lithium symmetric battery prepared in Example 4 of the present invention;

[0052] Figure 7 This is a data graph of the modified ultrathin lithium symmetric battery prepared in Example 5 of the present invention;

[0053] Figure 8 This is a data graph of the modified ultrathin lithium symmetric battery prepared in Example 6 of the present invention;

[0054] Figure 9 This is a data graph of the modified ultrathin lithium symmetric battery prepared in Example 7 of the present invention;

[0055] Figure 10 This is a graph showing the charge-discharge cycle data of the pure ultrathin lithium full battery prepared in Comparative Example 1 of this invention.

[0056] Figure 11 This is a graph showing the charge-discharge cycle data of the modified ultrathin lithium full battery prepared in Example 1 of the present invention;

[0057] Figure 12 This is a graph showing the charge-discharge cycle data of the modified ultrathin lithium full battery prepared in Example 4 of the present invention;

[0058] Figure 13 This is a graph showing the charge-discharge cycle data of the modified ultrathin lithium full battery prepared in Example 5 of the present invention;

[0059] Figure 14 This is a graph showing the charge-discharge cycle data of the modified ultrathin lithium full battery prepared in Example 6 of the present invention;

[0060] Figure 15 This is a graph showing the charge-discharge cycle data of the modified ultrathin lithium full battery prepared in Example 7 of the present invention;

[0061] Figure 16 These are comparison images of the electrodes of Example 1 and Comparative Example 1 of the present invention before and after being placed in a drying room for seven days. Detailed Implementation

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] Example 1

[0064] An ultrathin lithium-modified anode is prepared by the following method, comprising:

[0065] S1. Prepare the experimental environment. Conduct the lithium doping experiment in a glove box filled with argon gas to prevent lithium from reacting with moisture and oxygen in the air.

[0066] S2, Melting lithium metal. A suitable mass of lithium metal is placed in a nickel crucible and slowly heated at a certain temperature to completely melt the lithium. The mass of the lithium metal is 2g, and the temperature is 250℃.

[0067] S3, doped with 0.03g of metallic silver (Ag). The metallic silver (Ag) (in the form of a large metal wire) is immersed in molten lithium until it is completely melted.

[0068] S4, Homogenization treatment. The mixture of doped metal and molten lithium is ultrasonically stirred at 250°C for 2 hours to ensure that the doped metal is completely and uniformly dispersed in the lithium.

[0069] S5, Dip-coated thin film. A copper foil is dipped on one side into molten lithium containing doped metals (i.e., one side of the copper foil is dipped into a mixture of molten lithium containing doped metals). After cooling and forming, a composite foil (i.e., including the copper foil and a modified ultrathin lithium layer loaded on the copper foil) is obtained. The thickness of the modified ultrathin lithium layer loaded on the copper foil is measured to be 23 μm. Specific measurement results are as follows... Figure 1 As shown.

[0070] S6, Cutting the foil. Cut the composite foil into circular pieces of the appropriate diameter to serve as electrodes; specifically, the anode diameter for a coin cell is 15mm.

[0071] Example 2

[0072] An ultrathin lithium-modified anode, wherein, apart from 2g of metallic lithium and 0.31g of doped metallic silver (Ag), other conditions are consistent with those in Example 1.

[0073] Example 3

[0074] An ultrathin lithium-modified anode, wherein, apart from 2g of metallic lithium and 0.006g of doped metallic silver (Ag), other conditions are consistent with those in Example 1.

[0075] Example 4

[0076] An ultrathin lithium-modified anode, wherein, apart from 2g of metallic lithium and 0.17g of doped metallic tin (Sn), other conditions are consistent with those in Example 1.

[0077] Example 5

[0078] An ultrathin lithium-modified anode, wherein, apart from 2g of metallic lithium and 0.033g of indium (In) doped metal, other conditions are consistent with those in Example 1.

[0079] Example 6

[0080] An ultrathin lithium-modified anode, wherein, apart from 2g of lithium metal and 0.019g of zinc (Zn) doping, other conditions are consistent with those in Example 1.

[0081] Example 7

[0082] An ultrathin lithium-modified anode, wherein, apart from 2g of metallic lithium and 0.008g of doped metallic aluminum (Al), other conditions are consistent with those in Example 1.

[0083] Comparative Example 1

[0084] A pure ultrathin lithium anode, without any other metals, was used as the anode material for Comparative Example 1, with other conditions remaining the same as in Example 1. Conventional commercial lithium iron phosphate cathode sheets were assembled into CR2025 batteries, which were then used to assemble symmetrical cells and full cells. The charge / discharge current density of the symmetrical cells was 2 mA / cm². 2 The capacity is 1mAh / cm 2 The full cell was charged and discharged at a 1C rate and a voltage range of 2.5–4.0V. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetrical cell are shown in Table 1. Figure 2 and Figure 10 As shown.

[0085] Performance testing:

[0086] The ultrathin lithium metal prepared in Example 1 was used as the anode, and a conventional commercial electrolyte was used. Conventional commercial lithium iron phosphate cathode sheets were assembled into CR2025 batteries, which were then used to assemble symmetrical cells and full cells. The charge / discharge current density of the symmetrical cells was 2 mA / cm². 2 The capacity is 1mAh / cm 2 The full cell was charged and discharged at a 1C rate and a voltage range of 2.5–4.0V. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetrical cell are shown in Table 1. Figure 3 and Figure 11 As shown.

[0087] The ultrathin lithium metal prepared in Example 2 was selected as the anode, and other conditions remained the same as in Example 1. A symmetrical cell was assembled and tested. The stabilization time and polarization voltage of the symmetrical cell are shown in Table 1. Figure 4 As shown.

[0088] The ultrathin lithium metal prepared in Example 3 was selected as the anode, and other conditions were kept consistent with those in Example 1. A symmetrical cell was assembled and tested. The stabilization time and polarization voltage of the symmetrical cell are shown in Table 1. Figure 5 As shown.

[0089] The ultrathin lithium metal prepared in Example 4 was selected as the anode, and other conditions remained consistent with those in Example 1. Symmetric cells and full cells were assembled and tested. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetric cells are shown in Table 1. Figure 6 and Figure 12 As shown.

[0090] The ultrathin lithium metal prepared in Example 5 was selected as the anode, and other conditions remained consistent with those in Example 1. Symmetric cells and full cells were assembled and tested. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetric cells are shown in Table 1. Figure 7 and Figure 13 As shown.

[0091] The ultrathin lithium metal prepared in Example 6 was selected as the anode, and other conditions remained consistent with those in Example 1. Symmetric cells and full cells were assembled and tested. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetric cells are shown in Table 1. Figure 8 and Figure 14 As shown.

[0092] The ultrathin lithium metal prepared in Example 7 was selected as the anode, and other conditions were kept consistent with those in Example 1. Symmetric cells and full cells were assembled and tested. The specific capacity, initial efficiency, capacity retention after 300 cycles at room temperature, and the stabilization time and polarization voltage of the symmetric cells are shown in Table 1. Figure 9 and Figure 15 As shown.

[0093] Table 1 Performance Test Results

[0094]

[0095] As can be seen from the full-cell test results in Table 1, the modified ultrathin lithium provided by the present invention has higher cycle retention and first-cycle efficiency. In terms of specific capacity, the specific capacity of the modified ultrathin lithium examples is slightly lower than that of the comparative examples due to the doping of metals, but the capacity retention is significantly improved.

[0096] As can be seen from the symmetric cell test results in Table 1, the modified ultrathin lithium provided by this invention exhibits a lower polarization voltage and a longer stable cycling time, effectively suppressing interfacial side reactions. This demonstrates that the modified ultrathin lithium provided by this invention, due to the addition of dopants, is more conducive to providing a truly reversible lithium electrode with a stable electrode-electrolyte interface, enabling the preparation of ultrathin lithium foil (≤50µm) and achieving long-life cycling at high energy density.

[0097] from Figure 16The comparison results before and after seven days of drying in a dry room show that the modified ultrathin lithium provided by this invention significantly improves the stability of lithium battery anode material in dry air.

[0098] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A modified ultrathin lithium, characterized in that: The modified ultrathin lithium comprises metallic lithium and a dopant doped in the metallic lithium; The dopant is selected from metals with electronegativity greater than that of lithium metal.

2. The modified ultrathin lithium according to claim 1, characterized in that: The dopant is selected from at least one metal selected from beryllium, magnesium, aluminum, calcium, scandium, titanium, vanadium, chromium, manganese, iron, nickel, cobalt, copper, zinc, gallium, germanium, yttrium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, indium, tin, antimony, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, hafnium, tantalum, tungsten, osmium, iridium, platinum, gold, mercury, lead, bismuth, actinium, proton, thorium, neptunium, uranium, americium, plutonium, and curium; preferably at least one metal selected from tin, silver, or indium.

3. The modified ultrathin lithium according to claim 1, characterized in that: The thickness of the modified ultrathin lithium is ≤100um.

4. The modified ultrathin lithium according to claim 1, characterized in that: The thickness of the modified ultrathin lithium is 10–50 μm; preferably 10–30 μm.

5. The modified ultrathin lithium according to claim 1, characterized in that: In the modified ultrathin lithium, the molar ratio of dopant to lithium metal is 0.001% to 10.0%:1; preferably, the molar ratio of dopant to lithium metal is 0.1% to 1%:

1.

6. The method for preparing modified ultrathin lithium according to any one of claims 1-5, characterized in that, Includes the following steps: (1) In a glove box filled with protective gas, metallic lithium is melted in a crucible; a dopant is added to the molten metallic lithium and melted to obtain a lithium-dopant mixture; (2) After homogenizing the lithium-doped mixture, load the lithium-doped mixture onto the substrate and cool it to obtain modified ultrathin lithium.

7. The method for preparing modified ultrathin lithium according to claim 6, characterized in that: Step (1), the protective gas is argon; and / or, The melting temperature is 180–400°C; and / or, The molar ratio of dopant to lithium metal is 0.001% to 10.0%:1; preferably, the molar ratio of dopant to lithium metal is 0.1% to 1%:

1.

8. The method for preparing modified ultrathin lithium according to claim 6, characterized in that: Step (2), The homogenization temperature is 180–400 °C; and / or, The homogenization process takes 0.5 to 6 hours.

9. The method for preparing modified ultrathin lithium according to claim 6, characterized in that: The substrate is selected from copper foil; preferably, the loading method is to impregnate one side of the copper foil with the homogenized lithium-doped agent mixture; and / or, The thickness of the lithium-doped agent mixture loaded on the substrate after homogenization treatment is ≤100um; preferably 10-50um; more preferably 10-30um.

10. The application of the modified ultrathin lithium according to any one of claims 1-5 as an anode material for lithium batteries.

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