Preparation method and application of high-performance carbon-silicon composite negative electrode material with cell-like structure
By preparing a cell-like carbon-silicon composite anode material, the problems of low specific capacity and poor cycle performance of lithium-ion battery anode materials have been solved, achieving high-performance electrochemical stability and charge/discharge capacity, making it suitable for lithium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANKANG UNIV
- Filing Date
- 2022-11-11
- Publication Date
- 2026-05-01
AI Technical Summary
Existing lithium-ion battery anode materials suffer from problems such as low specific capacity, poor cycle performance, and large volume changes during charge and discharge. In particular, silicon anodes expand by up to 400% during charge and discharge, leading to electrode structure collapse and poor electrochemical stability.
A high-performance carbon-silicon composite anode material with a cell-like structure is used. Through steps such as ball milling, preparation of nano-silicon suspension and high-temperature fluidized boiling, a structure of flake graphite-coated silicon nanospheres is formed, which alleviates volume expansion and improves electrochemical stability.
It achieved a high initial discharge specific capacity of 1650 mAh/g, maintained a discharge capacity of 800 mAh/g after 200 cycles, and had a coulombic efficiency of over 99%, significantly improving the electrochemical performance of lithium-ion batteries.
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Figure CN115642240B_ABST
Abstract
Description
Preparation method and application of a high-performance carbon-silicon composite anode material with a cell-like structure Technical Field
[0001] This invention relates to a carbon-silicon composite anode material and its preparation method. Background Technology
[0002] Short driving range and long charging time have always been bottlenecks restricting the widespread application of power lithium-ion batteries. Currently, graphite anodes, mainly made of artificial graphite and natural graphite, have problems that urgently need to be solved, such as low specific capacity (<300mAh / g) during high current charging and discharging, poor cycle performance, and the formation of lithium dendrites on the electrode surface, which pose safety hazards.
[0003] Silicon anode materials possess a theoretical specific capacity of 4200 mAh / g and a lithium intercalation potential 0.15 V higher than carbon anodes, exhibiting a suitable electrochemical voltage window, making them a promising next-generation anode material. However, silicon anodes experience volume expansion of up to 400% during charge and discharge. This high volume deformation makes it difficult to form a stable solid electrolyte interface film on the silicon electrode surface, leading to the pulverization of active materials and the collapse of the overall electrode structure. Consequently, electrode capacity and cycle stability decrease dramatically, severely impacting the application of silicon anode materials in lithium-ion batteries. Summary of the Invention
[0004] The purpose of this invention is to solve the problems of low specific capacity, poor cycle performance, and large volume change during charge and discharge of existing lithium-ion battery anodes, and to provide a method for preparing and applying a high-performance carbon-silicon composite anode material with a cell-like structure.
[0005] A method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure is specifically carried out according to the following steps:
[0006] I. Ball mill:
[0007] ① First ball milling: Mix oxidized flake graphite and mesophase carbon microspheres in a certain proportion, then put them into a ball mill for liquid phase ball milling, and dry them after ball milling to obtain a mixture from the first ball milling.
[0008] ② Secondary ball milling: The mixture from the primary ball milling is placed in a ball mill for solid-phase ball milling to obtain a mixed material;
[0009] II. Preparation of nano-silicon suspension:
[0010] Nano-silicon was added to the dispersion and stirred to obtain a nano-silicon suspension;
[0011] III. Preparation of flake graphite-coated graphite carbon-silicon composite materials:
[0012] The mixed materials and nano-silicon suspension were added to a V-type mixer and stirred. Then, they were added to a fluidized bed device for high-temperature fluidization and boiling. At high temperature, the oxygen-containing functional groups of the oxidized flake graphite were removed and reduced. The flake graphite layer after high-temperature reduction curled up to obtain the original flake graphite-coated graphite carbon-silicon composite material.
[0013] IV. The flake graphite-coated graphite carbon-silicon composite material is subjected to planetary ball milling, sieving, and secondary heating carbonization treatment to obtain a high-performance carbon-silicon composite anode material with a cell-like structure.
[0014] A high-performance carbon-silicon composite anode material with a cell-like structure is used as an anode material for lithium-ion batteries.
[0015] The principle of this invention:
[0016] I. Compared with other carbon-silicon composite materials, the high-performance carbon-silicon composite anode material with a cell-like structure prepared in this invention has a novel cell-like structure. The outer layer of flake graphite is similar to a cell membrane, the mesophase carbon microspheres are similar to cytoplasm filling the flake graphite layers, and the silicon nanospheres are similar to a cell nucleus within the entire microstructure of the composite material. Compared with other carbon-silicon anodes, the carbon-silicon composite anode material with a cell-like structure in this invention combines the advantages of graphite anodes and silicon anodes. During charge and discharge, the cell membrane-flake graphite coating and the internal pores of the cytoplasm-mesophase carbon microspheres alleviate the volume expansion of the cell nucleus-silicon nanospheres during charge and discharge, which can enhance the electrochemical stability and cycle performance of the carbon-silicon anode. The flake graphite and mesophase carbon microspheres can increase the electrode conductivity, increase the electrochemical reaction sites, shorten the ion diffusion path, and improve the rate performance of the carbon-silicon anode. In addition, the lithium storage performance of the flake graphite and mesophase carbon microspheres themselves increases the charge and discharge capacity of the carbon-silicon anode, which can significantly improve the performance and application scenarios of lithium-ion batteries.
[0017] Advantages of this invention:
[0018] I. Compared with the prior art, the preparation process of this invention is controllable, the production cost is low, and it is easy to scale up production.
[0019] II. The high-performance carbon-silicon composite anode material with a cell-like structure prepared by this invention has an initial discharge specific capacity of up to 1650 mAh / g, and the discharge capacity remains at 800 mAh / g after 200 cycles, with a coulombic efficiency that is stable at over 99%.
[0020] This invention provides a high-performance carbon-silicon composite anode material with a cell-like structure. Attached Figure Description
[0021] Figure 1 is a scanning electron microscope image of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1;
[0022] Figure 2 is a transmission electron microscope image of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1;
[0023] Figure 3 shows the charge-discharge curves of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1. In the figure, 1 is the first charge-discharge curve, 2 is the second charge-discharge curve, and 3 is the third charge-discharge curve.
[0024] Figure 4 shows the cycling performance of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1;
[0025] Figure 5 shows the cycling performance of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 2. Detailed Implementation
[0026] The following embodiments further illustrate the content of the present invention, but should not be construed as limiting the present invention. Any modifications and substitutions made to the methods, steps, or conditions of the present invention without departing from the essence of the invention are within the scope of the present invention.
[0027] Specific Implementation Method 1: This implementation method describes a method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure, which is specifically completed according to the following steps:
[0028] I. Ball mill:
[0029] ① First ball milling: Mix oxidized flake graphite and mesophase carbon microspheres in a certain proportion, then put them into a ball mill for liquid phase ball milling, and dry them after ball milling to obtain a mixture from the first ball milling.
[0030] ② Secondary ball milling: The mixture from the primary ball milling is placed in a ball mill for solid-phase ball milling to obtain a mixed material;
[0031] II. Preparation of nano-silicon suspension:
[0032] Nano-silicon was added to the dispersion and stirred to obtain a nano-silicon suspension;
[0033] III. Preparation of flake graphite-coated graphite carbon-silicon composite materials:
[0034] The mixed materials and nano-silicon suspension were added to a V-type mixer and stirred. Then, they were added to a fluidized bed device for high-temperature fluidization and boiling. At high temperature, the oxygen-containing functional groups of the oxidized flake graphite were removed and reduced. The flake graphite layer after high-temperature reduction curled up to obtain the original flake graphite-coated graphite carbon-silicon composite material.
[0035] IV. The flake graphite-coated graphite carbon-silicon composite material is subjected to planetary ball milling, sieving, and secondary heating carbonization treatment to obtain a high-performance carbon-silicon composite anode material with a cell-like structure.
[0036] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that: the median particle size D50 of the mesophase carbon microspheres mentioned in step one ① is between 0.5 μm and 15 μm; the mass ratio of oxidized flake graphite to mesophase carbon microspheres mentioned in step one ① is (5-20):1. Other steps are the same as in Specific Implementation Method One.
[0037] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in the following ways: the solvent used for liquid-phase ball milling in step one ① is water or anhydrous ethanol; the ball-to-material ratio in step one ① is (1-5):1, the solid-liquid ratio is (2-10):1, and the milling time is 30-120 minutes, with alternating forward and reverse rotation every 15-30 minutes; the drying temperature in step one ① is 80℃-120℃, and the drying time is 120-600 minutes. Other steps are the same as in Specific Implementation Method One or Two.
[0038] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that: the solid-phase ball milling time in step one ② is 30 min to 120 min, with alternating forward and reverse rotation every 15 min to 30 min, and the ball-to-material ratio is (1 to 5):1. Other steps are the same as in Specific Implementation Methods One to Three.
[0039] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that: the stirring speed in step two is 500 r / min to 5000 r / min, and the stirring time is 15 min to 150 min; the particle size of the nano-silicon in step two is 80 to 120 nm. Other steps are the same as in Specific Implementation Methods One to Four.
[0040] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that: the dispersion in step two is a saturated sucrose solution; the mass ratio of nano-silicon to the dispersion in step two is (1-5):1. Other steps are the same as in Specific Implementation Methods One to Five.
[0041] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: the mass ratio of the mixed material to the nano-silica suspension in step three is (5-35):1; the power of the V-type mixer in step three is 1kW-5kW; and the stirring time is 15min-60min. Other steps are the same as in Specific Implementation Methods One to Six.
[0042] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One through Seven in that: the temperature of the high-temperature fluidized bed boiling in step three is 600℃~1200℃; the feed rate of the fluidized bed equipment in step three is 0.1~10kg / min, and the nitrogen gas feed rate is 0.2~10 standard m³. 3 The feed rate is 0.000 m / min, and the feeding method is screw feeding. Other steps are the same as in specific implementation methods one to seven.
[0043] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in the following ways: the planetary ball milling time in step four is 30-120 minutes, with alternating forward and reverse rotation every 15-30 minutes, and the ball-to-material ratio is (1-5):1; the sieving in step four is through a 140-400 mesh sieve; the secondary heating carbonization treatment in step four is at a temperature of 600℃-1400℃ for 120-600 minutes, and the atmosphere is nitrogen. Other steps are the same as in Specific Implementation Methods One to Eight.
[0044] Specific Implementation Method 10: This implementation method describes the use of a high-performance carbon-silicon composite anode material with a cell-like structure as an anode material for lithium-ion batteries.
[0045] The beneficial effects of the present invention are verified using the following embodiments:
[0046] Example 1: A method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure, which is carried out according to the following steps:
[0047] I. Ball mill:
[0048] ① First ball milling: Mix oxidized flake graphite and mesophase carbon microspheres in a certain proportion, then put them into a ball mill for liquid phase ball milling, and dry them after ball milling to obtain a mixture from the first ball milling.
[0049] The median particle size D50 of the mesophase carbon microspheres mentioned in step 1① is 0.5 μm;
[0050] The mass ratio of oxide flake graphite to mesophase carbon microspheres mentioned in step 1① is 10:2;
[0051] The solvent used in the liquid phase ball milling described in step 1① is water;
[0052] In step 1①, the ball-to-material ratio of the liquid phase ball mill is 4:1, the solid-to-liquid ratio is 2:1, the ball milling time is 90 minutes, and the forward and reverse rotations are alternated every 15 minutes.
[0053] The drying temperature described in step 1① is 100℃, and the drying time is 600min;
[0054] ② Secondary ball milling: The mixture from the primary ball milling is placed in a ball mill for solid-phase ball milling to obtain a mixed material;
[0055] The solid-phase ball milling time described in step 1② is 30 minutes, with alternating forward and reverse rotation every 15 minutes, and a ball-to-material ratio of 1:1.
[0056] II. Preparation of nano-silicon suspension:
[0057] Nano-silicon was added to the dispersion and stirred to obtain a nano-silicon suspension;
[0058] The stirring speed in step two is 800 r / min, and the stirring time is 30 min;
[0059] The nano-silicon mentioned in step two has a particle size of 100 nm;
[0060] The dispersion mentioned in step two is a saturated sucrose solution;
[0061] The mass ratio of nano-silicon to dispersion in step two is 2:1;
[0062] III. Preparation of flake graphite-coated graphite carbon-silicon composite materials:
[0063] The mixed materials and nano-silicon suspension were added to a V-type mixer and stirred. Then, they were added to a fluidized bed device for high-temperature fluidization and boiling. At high temperature, the oxygen-containing functional groups of the oxidized flake graphite were removed and reduced. The flake graphite layer after high-temperature reduction curled up to obtain the original flake graphite-coated graphite carbon-silicon composite material.
[0064] The mass ratio of the mixed material to the nano-silicon suspension mentioned in step three is 30:2;
[0065] The V-type mixer mentioned in step three has a power of 2kW; the mixing time is 60min.
[0066] The temperature for the high-temperature fluidized bed boiling described in step three is 750°C;
[0067] The feed rate of the fluidized bed equipment mentioned in step three is 0.2 kg / min, and the nitrogen gas feed rate is 1 standard m³. 3 / min, the feeding method is screw feeding;
[0068] IV. The flake graphite-coated graphite carbon-silicon composite material is subjected to planetary ball milling, sieving, and secondary heating carbonization treatment to obtain a high-performance carbon-silicon composite anode material with a cell-like structure.
[0069] The planetary ball mill described in step four has a milling time of 120 minutes, with alternating forward and reverse rotation every 15 minutes, and a ball-to-material ratio of 2:1.
[0070] The sieving mentioned in step four refers to passing the material through a 140-mesh sieve;
[0071] The secondary heating carbonization treatment in step four is carried out at a temperature of 1350°C for 180 minutes in a nitrogen atmosphere.
[0072] Figure 1 is a scanning electron microscope image of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1;
[0073] Figure 2 is a transmission electron microscope image of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1;
[0074] As shown in Figures 1 and 2, the composite material prepared by this invention has an overall morphology of a spherical structure encapsulated by graphite flakes. The spherical size of the mesophase carbon microspheres is between 200-600 nm, basically maintaining the original spherical structure. After heating, dehydration, and deoxidation, the rolled-up flake graphite sheets encapsulate the surface of the carbon microspheres and fill the spaces between them. The 100 nm silicon nanospheres are not obviously exposed on the material surface; they are encapsulated and filled between the carbon microspheres by the flake graphite sheets or embedded inside the flake graphite-carbon microsphere composite material during heating or ball milling, thus forming a cell-like composite material. That is, the outer layer of flake graphite is similar to a cell membrane, the mesophase carbon microspheres are similar to cytoplasm filling the flake graphite sheets, and the silicon nanospheres are similar to a cell nucleus within the entire microstructure of the composite material.
[0075] Figure 3 shows the charge-discharge curves of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1. In the figure, 1 is the first charge-discharge curve, 2 is the second charge-discharge curve, and 3 is the third charge-discharge curve.
[0076] As shown in Figure 3, at a current density of 0.1 A / g, the initial discharge capacity of the carbon-silicon composite anode material is 2360 mAh / g, and the initial charge capacity is 1554 mAh / g. The coulombic efficiency is relatively low in the first cycle, mainly due to the formation of an SEI film on the electrode surface during the first charge and discharge process. The irreversible formation of the SEI film consumes some of the Li. + The charge-discharge capacities for the second and third cycles were 1477 mAh / g, 1656 mAh / g, 1376 mAh / g, and 1433 mAh / g, respectively. After 2-3 charge-discharge cycles, the charge-discharge capacity of the carbon-silicon composite anode material gradually stabilized and was significantly higher than that of the carbon anode material.
[0077] Figure 4 shows the cycling performance of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 1.
[0078] As shown in Figure 4, at a constant current density of 0.5 A / g, the charge-discharge capacity of the carbon-silicon composite anode material stabilizes after 20 cycles, with a discharge capacity of 820 mAh / g. After 100 cycles, the discharge capacity remains at 670 mAh / g. After 300 cycles, the discharge capacity remains around 590 mAh / g, with the coulombic efficiency consistently above 99%. The capacity loss per week from 20 to 100 cycles is 1.87 mAh / g, with a capacity retention rate of 81.7%. The capacity loss per week from 100 to 300 cycles is only 0.4 mAh / g, with a capacity retention rate of 88.1%. This demonstrates that the high-performance carbon-silicon composite anode material with a cell-like structure prepared in this invention possesses stable charge-discharge cycle performance.
[0079] Example 2: A method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure, which is carried out according to the following steps:
[0080] I. Ball mill:
[0081] ① First ball milling: Mix oxidized flake graphite and mesophase carbon microspheres in a certain proportion, then put them into a ball mill for liquid phase ball milling, and dry them after ball milling to obtain a mixture from the first ball milling.
[0082] The median particle size D50 of the mesophase carbon microspheres mentioned in step 1① is 0.5 μm;
[0083] The mass ratio of oxide flake graphite to mesophase carbon microspheres mentioned in step 1① is 10:1;
[0084] The solvent used in the liquid phase ball milling described in step 1① is water;
[0085] In step 1①, the ball-to-material ratio of the liquid phase ball mill is 4:1, the solid-to-liquid ratio is 2:1, the ball milling time is 90 minutes, and the forward and reverse rotations are alternated every 15 minutes.
[0086] The drying temperature described in step 1① is 100℃, and the drying time is 600min;
[0087] ② Secondary ball milling: The mixture from the primary ball milling is placed in a ball mill for solid-phase ball milling to obtain a mixed material;
[0088] The solid-phase ball milling time described in step 1② is 30 minutes, with alternating forward and reverse rotation every 15 minutes, and a ball-to-material ratio of 1:1.
[0089] II. Preparation of nano-silicon suspension:
[0090] Nano-silicon was added to the dispersion and stirred to obtain a nano-silicon suspension;
[0091] The stirring speed in step two is 800 r / min, and the stirring time is 30 min;
[0092] The nano-silicon mentioned in step two has a particle size of 100 nm;
[0093] The dispersion mentioned in step two is a saturated sucrose solution;
[0094] The mass ratio of nano-silicon to dispersion in step two is 2:1;
[0095] III. Preparation of flake graphite-coated graphite carbon-silicon composite materials:
[0096] The mixed materials and nano-silicon suspension were added to a V-type mixer and stirred. Then, they were added to a fluidized bed device for high-temperature fluidization and boiling. At high temperature, the oxygen-containing functional groups of the oxidized flake graphite were removed and reduced. The flake graphite layer after high-temperature reduction curled up to obtain the original flake graphite-coated graphite carbon-silicon composite material.
[0097] The mass ratio of the mixed material to the nano-silica suspension in step three is 30:1;
[0098] The V-type mixer mentioned in step three has a power of 2kW; the mixing time is 60min.
[0099] The temperature for the high-temperature fluidized bed boiling described in step three is 800℃;
[0100] The feed rate of the fluidized bed equipment mentioned in step three is 0.2 kg / min, and the nitrogen gas feed rate is 1 standard m³. 3 / min, the feeding method is screw feeding;
[0101] IV. The flake graphite-coated graphite carbon-silicon composite material is subjected to planetary ball milling, sieving, and secondary heating carbonization treatment to obtain a high-performance carbon-silicon composite anode material with a cell-like structure.
[0102] The planetary ball mill described in step four has a milling time of 120 minutes, with alternating forward and reverse rotation every 15 minutes, and a ball-to-material ratio of 2:1.
[0103] The sieving mentioned in step four refers to passing the material through a 140-mesh sieve;
[0104] The secondary heating carbonization treatment in step four is carried out at a temperature of 1100℃ for 240 minutes in a nitrogen atmosphere.
[0105] Figure 5 shows the cycling performance of the high-performance carbon-silicon composite anode material with a cell-like structure prepared in Example 2.
[0106] As shown in Figure 5, at a constant current density of 0.5 A / g, the charge-discharge capacity of the carbon-silicon composite anode material tends to stabilize after 20 cycles, with a discharge capacity of 1250 mAh / g. After 100 cycles, the discharge capacity of the carbon-silicon composite anode material can be maintained at 880 mAh / g. After 300 cycles, the discharge capacity of the carbon-silicon composite anode material can be maintained at around 870 mAh / g, and the coulombic efficiency is stably maintained above 99%. The capacity loss per week from 20 to 100 cycles is 4.63 mAh / g, with a capacity retention rate of 70.4%. The capacity loss per week from 100 to 300 cycles is only 0.03 mAh / g, with a capacity retention rate of 98.9%. The discharge capacity and electrochemical cycling performance in Figure 5 and Figure 4 are significantly different, indicating that when factors such as raw material ratio, boiling temperature, carbonization temperature, and carbonization time change, the discharge capacity and electrochemical cycling stability of the carbon-silicon composite anode material prepared in this invention will also change accordingly.
Claims
1. A method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure, characterized in that... The preparation method is specifically carried out according to the following steps: I. Ball milling: ① First ball milling: Oxide flake graphite and mesophase carbon microspheres are mixed in a certain proportion, then placed in a ball mill for liquid-phase ball milling, and dried after ball milling to obtain the mixture from the first ball milling; ② Second ball milling: The mixture from the first ball milling is placed in a ball mill for solid-phase ball milling to obtain a mixed material; II. Preparation of nano-silicon suspension: Nano-silicon is added to the dispersion and stirred to obtain a nano-silicon suspension; III. Preparation of flake graphite-coated graphite carbon-silicon composite material: The mixed material and nano-silicon suspension are added to a V-type mixer and stirred, then added to a fluidized bed device for high-temperature fluidized boiling. At high temperature, the oxygen-containing functional groups of the oxidized flake graphite are removed and reduced. The flake graphite layer after high-temperature reduction curls to obtain... The process involves: 1) Obtaining a graphite carbon-silicon composite material coated with flake graphite; 2) Performing a planetary ball milling, sieving, and secondary heating carbonization treatment on the flake graphite coated graphite carbon-silicon composite material to obtain a high-performance carbon-silicon composite anode material with a cell-like structure; 3) Performing a planetary ball milling for 30-120 minutes, alternating forward and reverse rotation every 15-30 minutes, with a ball-to-material ratio of (1-5):1; 4) Performing a secondary heating carbonization treatment for 600-1400℃ for 120-600 minutes in a nitrogen atmosphere.
2. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The median particle size D50 of the mesophase carbon microspheres mentioned in step 1① is 0.5µm to 15µm; the mass ratio of the oxide flake graphite to the mesophase carbon microspheres mentioned in step 1① is (5~20):
1.
3. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The solvent used in the liquid phase ball milling in step 1① is water or anhydrous ethanol; the ball-to-material ratio in the liquid phase ball milling in step 1① is (1~5):1, the solid-liquid ratio is (2~10):1, the milling time is 30min~120min, and the forward and reverse rotations are alternated every 15min~30min; the drying temperature in step 1① is 80℃~120℃, and the drying time is 120min~600min.
4. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The solid-phase ball milling time in step 1② is 30min~120min, with alternating forward and reverse rotation every 15min~30min, and the ball-to-material ratio is (1~5):
1.
5. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The stirring speed in step two is 500 r / min to 5000 r / min, and the stirring time is 15 min to 150 min; the particle size of the nano-silicon in step two is 80 to 120 nm.
6. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The dispersion in step two is a saturated sucrose solution; the mass ratio of nano-silicon to dispersion in step two is (1~5):
1.
7. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The power of the V-type mixer mentioned in step three is 1kW~5kW; the mixing time is 15min~60min.
8. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The feed rate of the fluidized bed equipment mentioned in step three is 0.1~10 kg / min, and the nitrogen gas feed rate is 0.2~10 standard m³. 3 / min, the feeding method is screw feeding.
9. The method for preparing a high-performance carbon-silicon composite anode material with a cell-like structure according to claim 1, characterized in that... The sieving mentioned in step four refers to sieving through a 140-400 mesh sieve.
10. The application of a high-performance carbon-silicon composite anode material with a cell-like structure prepared by the preparation method according to claim 1, characterized in that... A high-performance carbon-silicon composite anode material with a cell-like structure is used as an anode material for lithium-ion batteries.