High-temperature-cycle-resistant lithium battery negative electrode material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lithium batteries, in particular to a high-temperature-cycle-resistant lithium battery negative electrode material as well as a preparation method and application thereof. The negative electrode material comprises single-particle artificial graphite, a binder and a conductive agent, the single-particle artificial graphite is adopted, the use amount of the conductive agent is reduced, and the surface area of the conductive agent is increased, so that the contradictory problem that the dynamic performance is reduced while active sites on the surface of the graphite are reduced is solved; according to the invention, the charge-discharge stability of the lithium ion battery under a high-temperature condition is improved, the high-temperature storage performance is improved, the high-temperature cycle life is prolonged, the processability is improved, meanwhile, the capacity exertion of the positive electrode material is not influenced, and the comprehensive performance has obvious advantages.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a high-temperature cycling resistant lithium battery anode material, its preparation method, and its application. Background Technology

[0002] The increasing size of batteries complicates heat dissipation, impacting lifespan and potentially causing safety issues. Furthermore, summer ambient temperatures frequently exceed 40°C, and conventional battery performance is highly temperature-sensitive, requiring thermal management adjustments that increase cooling system energy consumption and costs. Therefore, the development of high-temperature cycle-resistant batteries presents a significant market demand and promising prospects. High-temperature batteries reduce the cost of cooling devices, save energy and space investment, and improve high-temperature cycle life, effectively lowering battery usage and maintenance costs and significantly enhancing product competitiveness. Currently, most energy storage battery systems have a cycle life of around 1500 cycles (80% SOH) at 45°C, which is generally low, thus reducing the battery's throughput capacity over its entire lifespan under high-temperature conditions. There is an urgent need to develop a high-temperature resistant battery anode material to extend the 45°C cycle life to over 2500 cycles. Summary of the Invention

[0003] In view of this, the present invention proposes a high-temperature cycling resistant lithium battery anode material, its preparation method, and its application. By using single-particle artificial graphite and simultaneously reducing the amount of conductive agent and increasing its surface area, the contradictory problem of reducing the active sites on the graphite surface while causing a decrease in kinetic performance is solved, significantly improving the high-temperature storage performance and high-temperature cycling performance of the battery.

[0004] Research has revealed that during the charging and discharging process of lithium-ion batteries, a uniform and stable SEI film forms on the surface of graphite particles. However, due to the numerous irregular morphologies on the negative electrode graphite surface, a large number of active sites are generated. The SEI film formed at these active sites is easily damaged, especially under high-temperature conditions. This process repeats itself, accelerating the consumption of lithium salts and film-forming additives in the electrolyte. As the electrolyte is consumed, the battery capacity gradually decreases, ultimately reducing the battery's cycle life. This invention aims to find a negative electrode material that reduces the number of active sites on the graphite surface while ensuring that the negative electrode's kinetic performance and specific capacity do not decrease. This system significantly improves high-temperature storage performance and high-temperature cycling performance, meeting the target of 2500 cycles at 45°C (an improvement in cycle life of over 1000 cycles).

[0005] The technical solution of this invention is implemented as follows: In a first aspect, the present invention provides a lithium battery anode material, wherein the raw materials of the lithium battery anode material include single-particle artificial graphite, a binder, and a conductive agent; the specific surface area of ​​the single-particle artificial graphite is 1.0~1.2m². 2 / g.

[0006] Single-particle graphite has a smooth spherical or near-spherical morphology, while secondary-particle artificial graphite is a porous and fluffy spherical shape with an internal network structure composed of primary particles and binder carbon bridges. This invention uses single-particle artificial graphite to replace secondary-particle artificial graphite as the negative electrode of the battery, reducing the specific surface area of ​​the graphite particles, reducing the active sites of graphite, and reducing the occurrence of side reactions, thereby improving high-temperature storage capacity and cycle life.

[0007] Reducing the specific surface area of ​​graphite particles leads to a decrease in the kinetic performance of the negative electrode, reducing the battery's specific capacity by 0.8-1.0 mAh / g, which fails to meet the design requirement of a specific capacity greater than 145 mAh / g. This invention addresses this by reducing the amount of conductive agent used while increasing its specific surface area. The aim is to reduce the amount of conductive agent used, thereby decreasing the generation of active sites, and simultaneously increasing its specific surface area. This enhances the coating and bonding effect of the conductive agent on graphite particles per unit amount, improving the conductivity of individual graphite particles. The synergistic effect of the larger specific surface area and lower dosage ensures the kinetic performance and specific capacity of the negative electrode graphite material.

[0008] Based on the above technical solutions, preferably, the specific surface area of ​​the single-particle artificial graphite is 1.1 m². 2 / g.

[0009] Based on the above technical solutions, preferably, the amount of the conductive agent is 0.4% to 1.0% based on a total mass percentage of 100%.

[0010] Based on the above technical solutions, a further preferred embodiment is that the amount of the conductive agent is 0.6% to 0.8% based on a total mass percentage of 100%.

[0011] Based on the above technical solutions, and even more preferably, the amount of the conductive agent is 0.6% based on a total mass percentage of 100%.

[0012] Based on the above technical solutions, preferably, the specific surface area of ​​the conductive agent is 50~90m². 2 / g.

[0013] Based on the above technical solution, a further preferred embodiment is that the specific surface area of ​​the conductive agent is 50~70m². 2 / g.

[0014] Based on the above technical solution, and even more preferably, the specific surface area of ​​the conductive agent is 70m². 2 / g.

[0015] Based on the above technical solutions, preferably, the amount of the single-particle artificial graphite is 95.4%~96.2% and the amount of the binder is 3.4%~3.6% based on a total mass percentage of 100%.

[0016] Based on the above technical solution, a further preferred embodiment is that, based on a total mass percentage of 100%, the amount of the single-particle artificial graphite is 95.9%, and the amount of the binder is 3.5%.

[0017] Based on the above technical solutions, preferably, the conductive agent includes any one of superconducting carbon black (SP), acetylene black, and Ketjen black.

[0018] Based on the above technical solutions, a further preferred embodiment is superconducting carbon black.

[0019] Based on the above technical solutions, preferably, the binder is sodium carboxymethyl cellulose (CMC) (purchased from Weiyi Technology, model 2300).

[0020] Artificial graphite is an active material in lithium-ion batteries, serving as a "container" and "transfer station" for lithium ions, storing and releasing them during charging and discharging. Superconducting carbon black itself does not provide capacity; its core function is to enhance the conductivity of artificial graphite. The electronic conductivity of artificial graphite itself is limited, especially after the artificial graphite particles are linked and encapsulated, which further hinders the flow of electrons. The role of superconducting carbon black is to build an efficient electronic conduction channel between these non-conductive or poorly conductive areas. It fills the spaces between artificial graphite particles, forming a continuous three-dimensional conductive network through mutual contact, connecting isolated graphite particles, allowing electrons to pass through quickly and ultimately converge onto the copper foil.

[0021] Secondly, a method for preparing the lithium battery anode material as described above is provided, comprising the following steps: S1, Dissolve the adhesive in water and stir until homogeneous, controlling the solid content to be 1.8~2.2wt%; S2, then add a conductive agent to make a conductive adhesive, and stir evenly; S3, then add artificial graphite and knead. After kneading, add 18-22 wt% water of the total dry powder and stir evenly to obtain the negative electrode material.

[0022] Based on the above technical solutions, preferably, the water is deionized water.

[0023] Based on the above technical solutions, preferably, in step S1, the stirring time is 55-65 min and the rotation speed is 900-1100 rpm; in step S2, the stirring time is 25-35 min and the rotation speed is 1400-1600 rpm; in step S3, the kneading time is 55-65 min and the rotation speed is 180-220 rpm, and the stirring speed is 1900-2100 rpm.

[0024] Based on the above technical solutions, in a further preferred embodiment, in step S1, the stirring time is 60 minutes and the rotation speed is 1000 rpm; in step S2, the stirring time is 30 minutes and the rotation speed is 1500 rpm; in step S3, the kneading time is 60 minutes and the rotation speed is 200 rpm, and the stirring speed is 2000 rpm.

[0025] Thirdly, a lithium battery is provided, which includes the lithium battery negative electrode material as described above.

[0026] Fourthly, a method for preparing a lithium battery as described above is provided, wherein a positive electrode active material, a conductive agent, and a binder are coated onto an aluminum foil, a negative electrode active material is coated onto a copper foil, and the positive electrode active material is coated onto a copper foil. After being wound with a separator, the positive electrode active material is assembled into a battery cell, placed in a casing, and then subjected to encapsulation, baking, liquid injection, formation, and capacity testing processes to obtain an aluminum-cased battery cell.

[0027] Based on the above technical solutions, preferably, the housing is an aluminum housing.

[0028] Based on the above technical solutions, preferably, after the liquid injection, the battery cell is placed at 43~47℃ and left to stand for 23~25 hours; more preferably, the battery cell is placed at 45℃ and left to stand for 24 hours.

[0029] The purpose of allowing the electrode to stand at high temperature after electrolyte injection is to ensure that the fresh electrolyte fully wets the electrode, so that the entire electrode has a lithium-ion transport channel during formation, and to prevent interface defects such as local black spots and purple spots.

[0030] The high-temperature cycling-resistant lithium battery anode material, its preparation method, and its application of the present invention have the following advantages over the prior art: 1. The graphite of this invention uses single-particle artificial graphite, replacing the currently commonly used secondary-particle artificial graphite. This type of graphite has a regular particle morphology and fewer surface active sites, which can effectively reduce the occurrence of side reactions, thereby improving the charge-discharge stability of lithium-ion batteries under high-temperature conditions. This is unmatched by existing secondary-particle artificial graphite. Even when using single-particle and secondary-particle artificial graphite with the same specific surface area, the particle size of secondary-particle artificial graphite will be larger than that of single-particle artificial graphite due to structural differences. Using secondary-particle artificial graphite with the same specific surface area will sacrifice kinetic performance and affect specific capacity.

[0031] 2. This invention employs a high specific surface area conductive agent to enhance the conductivity of graphite while reducing the amount of conductive agent used. This combination ensures both the kinetic performance of the negative electrode and reduces active sites and defects on the negative electrode surface. The reduced amount of conductive agent also improves processing performance, decreases slurry fineness, and enhances material processing capabilities. In summary, compared to existing technologies, this invention not only improves the charge-discharge stability of lithium-ion batteries under high-temperature conditions, enhances high-temperature storage performance and high-temperature cycle life, but also improves processing performance without affecting the capacity utilization of the positive electrode material, demonstrating significant advantages in overall performance. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a diagram of the reactive sites on the surface of a single-particle artificial graphite in this invention. Figure 2 This is a diagram of the reactive sites on the surface of the secondary particle artificial graphite in this invention. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] The single-particle artificial graphite used in this invention was purchased from Carbon Technology: model CN-0, with a specific surface area of ​​0.9 m². 2 / g, the specific surface area of ​​model CN-1 is 1.0m².2 / g, the specific surface area of ​​model CN-2 is 1.1m³. 2 / g, the specific surface area of ​​model CN-3 is 1.2m². 2 / g, the specific surface area of ​​model CN-4 is 1.3m². 2 / g; Secondary granular artificial graphite was purchased from Carbon Technology, model FN-1, with a specific surface area of ​​1.3m². 2 / g, the specific surface area of ​​model FN-3 is 1.6m². 2 / g; Superconducting carbon black purchased from Dongheng Technology: Model A4 has a specific surface area of ​​40m². 2 / g, the specific surface area of ​​model A5 is 50m². 2 / g, the specific surface area of ​​model A6 is 60m². 2 / g, the specific surface area of ​​model A7 is 70m². 2 / g, the specific surface area of ​​model A8 is 90m². 2 / g, the specific surface area of ​​model A9 is 100m². 2 / g; The adhesive was purchased from Weiyi Technology, model 2300.

[0036] Example 1 Preparation of an artificial graphite anode material.

[0037] Dissolve 3.5g of binder in deionized water and stir at 1000rpm for 60min, controlling the solid content to be 2wt%. Weigh 1.0g of conductive agent SP and add it to the stirred binder. SP has a specific surface area of ​​50m². 2 / g, to prepare a conductive adhesive, and stir at high speed of 1500rpm for 30 minutes; then add 95.5g of single-particle artificial graphite (specific surface area 1.1m²). 2 Knead the dry powder (g) at 200 rpm for 60 minutes. After kneading, add 20 wt% of deionized water and stir at 2000 rpm until homogeneous to obtain the negative electrode material.

[0038] Example 2 Preparation of an artificial graphite anode material.

[0039] Dissolve 3.4g of binder in deionized water and stir at 900rpm for 55min, controlling the solid content to be 1.8wt%. Weigh 0.4g of conductive agent SP and add it to the stirred binder. SP has a specific surface area of ​​50m². 2 / g, to prepare a conductive adhesive, and stir at high speed of 1400rpm for 25 minutes; then add 96.2g of single-particle artificial graphite (specific surface area 1.0m²). 2Knead the mixture at 180 rpm for 55 minutes (g), then add 18 wt% of deionized water and stir at 1900 rpm until homogeneous to obtain the negative electrode material.

[0040] Example 3 Preparation of an artificial graphite anode material.

[0041] Dissolve 3.6g of binder in deionized water and stir at 1100rpm for 65min, controlling the solid content to be 2.2wt%. Weigh 1.0g of conductive agent SP and add it to the stirred binder. SP has a specific surface area of ​​90m². 2 / g, to prepare a conductive adhesive, and stir at high speed of 1600rpm for 35 minutes; then add 95.5g of single-particle artificial graphite (specific surface area 1.2m²). 2 Knead the mixture at 220 rpm for 65 minutes (g), then add 22 wt% of deionized water and stir at 2100 rpm until homogeneous to obtain the negative electrode material.

[0042] Comparative Example 1 Preparation of an artificial graphite anode material.

[0043] The preparation method of this comparative example is basically the same as that of Example 1, except that single-particle artificial graphite is replaced with an equal amount of secondary-particle artificial graphite (specific surface area of ​​1.6 m²). 2 / g).

[0044] High-temperature cycle life test: The negative electrode materials prepared in Examples 1-3 and Comparative Example 1 were used to prepare batteries. Positive electrode active materials, conductive agents, and binders were coated onto aluminum foil. The negative electrode active materials from Examples 1-3 and Comparative Example 1 were coated onto copper foil. After being wound with a separator, these were assembled into a battery cell. The cell was then placed in a casing and subjected to encapsulation, baking, electrolyte injection, formation, and capacity testing to obtain an aluminum-cased battery cell. After electrolyte injection, the battery cell was placed at 45°C for 24 hours. The high-temperature cycle life of the battery was tested using conventional testing methods, and the results are shown in Table 1.

[0045] Table 1. High-temperature cycle life test results of different types of artificial graphite

[0046] pass Figure 1 As can be seen, single-particle artificial graphite has a regular surface and few active sites, resulting in low surface activity, minimal capacity loss, and good high-temperature performance at high temperatures; while secondary-particle artificial graphite has an irregular surface and many active sites (such as...). Figure 2 As shown in the figure, the surface activity is high at high temperatures, making it prone to side reactions, resulting in significant capacity loss and poor high-temperature performance. Figure 1and Figure 2 The red box in the image represents the active site region.

[0047] As shown in Table 1, single-particle artificial graphite has a more regular surface morphology and a relatively smaller specific surface area than secondary-particle artificial graphite. Under the same ratio, the capacity retention rate after 7 days of storage at 55℃ is increased by 0.2~0.4%, and the capacity retention rate after 500 cycles at 45℃ is increased by 0.4~0.6%, while the battery capacity remains unchanged.

[0048] Example 4 Preparation of an artificial graphite anode material.

[0049] The preparation method of this comparative example is basically the same as that of Example 1, except that an equal amount of material with a specific surface area of ​​1.1 m² is used. 2 / g of single-particle artificial graphite.

[0050] Example 5 Preparation of an artificial graphite anode material.

[0051] The preparation method of this comparative example is basically the same as that of Example 1, except that an equal amount of material with a specific surface area of ​​1.2 m² is used. 2 / g of single-particle artificial graphite.

[0052] Comparative Example 2 Preparation of an artificial graphite anode material.

[0053] The preparation method of this comparative example is basically the same as that of Example 1, except that an equal amount of material with a specific surface area of ​​0.9 m² is used. 2 / g of single-particle artificial graphite.

[0054] Comparative Example 3 Preparation of an artificial graphite anode material.

[0055] The preparation method of this comparative example is basically the same as that of Example 1, except that an equal amount of material with a specific surface area of ​​1.3 m² is used. 2 / g of single-particle artificial graphite.

[0056] Comparative Example 4 Preparation of an artificial graphite anode material.

[0057] The preparation method of this comparative example is basically the same as that of Example 1, except that an equal amount of material with a specific surface area of ​​1.3 m² is used. 2 / g of secondary particle artificial graphite.

[0058] Batteries were fabricated using the negative electrode materials prepared in Examples 1, 4, and 5, as well as Comparative Examples 2-4. Positive electrode active materials, along with a conductive agent and a binder, were coated onto aluminum foil. The negative electrode active materials from Examples 1, 4, and 5, as well as Comparative Examples 2-4, were coated onto copper foil. These materials were then wound with a separator and assembled into a battery cell. After being placed in a casing, the cell underwent encapsulation, baking, electrolyte injection, formation, and capacity testing to obtain an aluminum-cased battery cell. After electrolyte injection, the cell was placed at 45°C for 24 hours. The electrical performance of the batteries was tested using conventional testing methods, and the results are shown in Table 2.

[0059] Table 2. Experimental results on the effect of specific surface area of ​​different types of artificial graphite on electrical properties

[0060] Examples 1, 4, and 5 used single-particle artificial graphite with specific surface areas of 1.0 m², respectively. 2 / g, 1.1m 2 / g, 1.2m 2 / g, both the gram capacity and processing performance meet the requirements.

[0061] Comparative Examples 2 and 3 used a specific surface area of ​​0.9 m². 2 / g and 1.3m 2 The high-temperature storage capacity retention rate of Comparative Example 3 was 0.3% lower than that of Example 1, which is the same as that of Comparative Example 1. The reason for the lower high-temperature storage retention rate is that the specific surface area of ​​the single-particle artificial graphite increases, resulting in more active sites, which leads to a decrease in high-temperature storage performance and thus affects the high-temperature cycle life. The capacity of Comparative Example 2 was 0.4 mAh / g lower than that of Example 1. The main reason is that as the specific surface area of ​​the single particle decreases, the lithium intercalation channels decrease. After the specific surface area decreases to a certain value, its kinetic performance decreases, which ultimately affects the capacity.

[0062] Even when using secondary graphite particles with the same specific surface area as single-particle artificial graphite (Comparative Example 4), its high-temperature storage capacity retention rate is 0.2% lower than that of Example 1, and its specific capacity is 0.4 mAh / g lower than that of Example 1 and Comparative Example 3. The main reason is that secondary particles with the same specific surface area have a slightly larger particle volume than single particles, which leads to a decrease in their kinetic performance and thus affects their specific capacity.

[0063] Example 6 Preparation of an artificial graphite anode material.

[0064] The preparation method of this embodiment is basically the same as that of Example 1, except that the amount of conductive agent SP is 0.4g, and the amount of single-particle artificial graphite is adjusted to 95.9g accordingly.

[0065] Example 7 Preparation of an artificial graphite anode material.

[0066] The preparation method of this embodiment is basically the same as that of Example 1, except that the amount of conductive agent SP is 0.6g, and the amount of single-particle artificial graphite is adjusted to 96.1g accordingly.

[0067] Example 8 Preparation of an artificial graphite anode material.

[0068] The preparation method of this embodiment is basically the same as that of Example 1, except that the amount of conductive agent SP is 0.7g, and the amount of single-particle artificial graphite is adjusted to 95.9g accordingly.

[0069] Example 9 Preparation of an artificial graphite anode material.

[0070] The preparation method of this embodiment is basically the same as that of Example 1, except that the amount of conductive agent SP is 0.8g, and the amount of single-particle artificial graphite is adjusted to 95.7g accordingly.

[0071] Comparative Example 5 Preparation of an artificial graphite anode material.

[0072] The preparation method of this comparative example is basically the same as that of Example 1, except that the amount of conductive agent SP is 0.2g, and the amount of single-particle artificial graphite is adjusted to 96.3g accordingly.

[0073] Comparative Example 6 Preparation of an artificial graphite anode material.

[0074] The preparation method of this comparative example is basically the same as that of Example 1, except that the amount of conductive agent SP is 1.2g, and the amount of single-particle artificial graphite is adjusted to 95.3g accordingly.

[0075] High-temperature cycle life test: The negative electrode materials prepared in Examples 1, 6-9, and Comparative Examples 5-6 were used to prepare batteries according to the above method. The high-temperature cycle life of the batteries was tested using conventional testing methods, and the results are shown in Table 3.

[0076] Table 3. High-temperature cycling life test results of SP with different contents

[0077] As can be seen, with the decrease of SP content, the capacity retention rate after 7 days of storage at 55℃ gradually increases. Among them, the group with SP content of 0.6wt% (Example 7) shows the highest capacity retention rate improvement of 0.4%, and the capacity retention rate after 500 cycles at 45℃ also increases by 0.4%. At the same time, the battery specific capacity gradually decreases with the decrease of SP content. Based on the SP content of 0.6wt%, the SP specific surface area was further optimized.

[0078] Example 10 Preparation of an artificial graphite anode material.

[0079] The preparation method in this embodiment is basically the same as that in Example 7, except that the specific surface area of ​​the conductive agent SP is adjusted to 60m². 2 / g.

[0080] Example 11 Preparation of an artificial graphite anode material.

[0081] The preparation method in this embodiment is basically the same as that in Example 7, except that the specific surface area of ​​the conductive agent SP is adjusted to 70m². 2 / g.

[0082] Example 12 Preparation of an artificial graphite anode material.

[0083] The preparation method in this embodiment is basically the same as that in Example 7, except that the specific surface area of ​​the conductive agent SP is adjusted to 90m². 2 / g.

[0084] Comparative Example 7 Preparation of an artificial graphite anode material.

[0085] The preparation method in this embodiment is basically the same as that in Example 7, except that the specific surface area of ​​the conductive agent SP is adjusted to 40m². 2 / g.

[0086] Comparative Example 8 Preparation of an artificial graphite anode material.

[0087] The preparation method in this embodiment is basically the same as that in Example 7, except that the specific surface area of ​​the conductive agent SP is adjusted to 100m². 2 / g.

[0088] High-temperature cycle life test: The negative electrode materials prepared in Examples 7, 10, 11, and 12, as well as Comparative Examples 7 and 8, were used to prepare batteries according to the above method. The high-temperature cycle life of the batteries was tested using conventional testing methods, and the results are shown in Table 4.

[0089] Table 4. Comparison of SP high-temperature cycling (45℃) results with different specific surface areas

[0090] Table 4 shows that when the SP dosage is 0.6wt% and different SP specific surface area tables are used, the specific surface area is 50~70m². 2 The SP groups (Examples 7, 10, 11, and 12) showed a gram capacity increase of 0.3 to 0.6 mAh / g compared to the control groups (Comparative Examples 7 and 8), and a 0.2% improvement in capacity retention after 7 days of storage at 55°C.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lithium battery anode material, characterized in that: The raw materials for the lithium battery anode material include single-particle artificial graphite, a binder, and a conductive agent; the specific surface area of ​​the single-particle artificial graphite is 1.0~1.2m². 2 / g.

2. The lithium battery anode material as described in claim 1, characterized in that: The amount of the conductive agent is 0.4% to 1.0% based on a total mass percentage of 100%.

3. The lithium battery anode material as described in claim 2, characterized in that: The specific surface area of ​​the conductive agent is 50~90m². 2 / g.

4. The lithium battery anode material as described in claim 1, characterized in that: The amount of the single-particle artificial graphite is 95.4% to 96.2% based on a total mass percentage of 100%, and the amount of the binder is 3.4% to 3.6%.

5. The lithium battery anode material as described in claim 1, characterized in that: The conductive agent includes any one of superconducting carbon black, acetylene black, and Ketjen black.

6. The method for preparing the lithium battery anode material as described in claim 1, characterized in that, Includes the following steps: S1, Dissolve the adhesive in water and stir until homogeneous, controlling the solid content to be 1.8~2.2wt%; S2, then add a conductive agent to make a conductive adhesive, and stir evenly; S3, then add artificial graphite and knead. After kneading, add 18-22 wt% water of the total dry powder and stir evenly to obtain the negative electrode material.

7. The method for preparing the lithium battery anode material as described in claim 6, characterized in that: In step S1, the stirring time is 55-65 min and the rotation speed is 900-1100 rpm; in step S2, the stirring time is 25-35 min and the rotation speed is 1400-1600 rpm; in step S3, the kneading time is 55-65 min and the rotation speed is 180-220 rpm, and the stirring speed is 1900-2100 rpm.

8. A lithium battery, characterized in that: It includes the lithium battery anode material as described in claim 1.

9. A method for preparing a lithium battery as described in claim 8, characterized in that: The positive electrode active material, conductive agent, and binder are coated onto aluminum foil, and the negative electrode active material is coated onto copper foil. After being wound with a separator, they are assembled into a battery cell, placed in a housing, and then subjected to packaging, baking, liquid injection, formation, and capacity testing processes to obtain an aluminum-cased battery cell.

10. The method for preparing a lithium battery as described in claim 9, characterized in that: The process after electrolyte injection also includes placing the battery cell at 43-47°C for 23-25 ​​hours.

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