CN114975976B - Nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material and preparation method and application thereof - Google Patents
Nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a nano silicon inlaid three-dimensional honeycomb carbon composite anode material, a preparation method and application thereof. The three-dimensional honeycomb carbon porous conductive network formed by the carbon layer uniformly coated on the surface of the nano silicon particles and the carbon nano sheet can effectively improve the electronic conductivity of silicon, inhibit the structural damage and SEI film damage caused by the volume expansion effect of the silicon negative electrode, and effectively improve the electrochemical activity and the cycling stability when used as a negative electrode material of a lithium ion battery. The preparation method is simple and convenient, has good effect and has wide application prospect on the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of battery materials, in particular to a nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material, and a preparation method and application thereof.
Background
Silicon has the highest theoretical specific capacity of 4200 mAh/g as a negative electrode material of the lithium ion battery, has lower lithium intercalation potential (less than 0.5V vs Li) and rich reserve, and is considered as the most ideal negative electrode material of the next-generation lithium ion battery.
However, silicon itself has extremely low electron conductivity and poor electrochemical activity. And the volume expansion of the silicon anode after lithium intercalation can reach 300%, and a huge volume expansion effect can generate larger stress, so that the silicon anode material is pulverized, the contact between active materials is poor, the active materials are separated from a current collector, and the capacity is rapidly attenuated. In addition, the volumetric expansion effect of the silicon negative electrode also causes difficulty in forming a stable solid electrolyte interface (SEI film) on the surface thereof, severely affecting the specific capacity, stability, coulombic efficiency and the like.
Disclosure of Invention
The invention provides a nano-silicon-embedded three-dimensional honeycomb carbon composite anode material, a preparation method and application thereof, which are used for overcoming the defects in the prior art.
In order to achieve the above purpose, the invention provides a nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which is characterized in that the composite anode material comprises nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer.
In order to achieve the above purpose, the invention also provides a preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises the following steps:
s1: adding nano silicon powder into a mixed solution containing a surfactant, stirring, uniformly dispersing by ultrasonic, sequentially adding resorcinol and formaldehyde, stirring at a set temperature for reaction, adding tetraethoxysilane, continuously stirring for reaction, filtering, washing and drying to obtain precursor powder;
s2: ball-milling and uniformly mixing the precursor powder with organic acid sodium or organic acid potassium, and placing the mixture in an inert atmosphere for heat treatment to obtain sintered powder;
s3: and (3) placing the sintered powder into an aqueous solution for washing, filtering and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material.
In order to achieve the above purpose, the invention also provides application of the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material, and the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material is used as a lithium ion battery anode; the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material is the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material or the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material prepared by the preparation method; the mass fraction of silicon in the nano-silicon embedded three-dimensional honeycomb carbon composite anode material is 10-80 wt%.
Compared with the prior art, the invention has the beneficial effects that:
1. the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material provided by the invention comprises nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer. The three-dimensional honeycomb carbon porous conductive network formed by the carbon layer uniformly coated on the surface of the nano silicon particles and the carbon nano sheet can effectively improve the electronic conductivity of silicon, inhibit the structural damage and SEI film damage caused by the volume expansion effect of the silicon negative electrode, and effectively improve the electrochemical activity and the cycling stability when used as a negative electrode material of a lithium ion battery.
2. The preparation method of the nano silicon inlaid three-dimensional honeycomb carbon composite anode material provided by the invention firstly takes resorcinol, formaldehyde, organic acid sodium or organic acid potassium salt and the like as carbon sources, and the raw materials are cheap and easy to obtain. Secondly, uniformly coating the nano silicon on a phenolic resin organic layer, further coating a silicon dioxide inorganic layer, uniformly ball-milling and mixing with organic sodium or potassium acid, and performing heat treatment in an inert atmosphere to carbonize the phenolic resin organic layer, the organic sodium or potassium acid at high temperature to form a nano silicon carbon coating layer and a three-dimensional honeycomb carbon structure; and the silicon dioxide inorganic layer reacts with organic sodium or organic potassium in a high-temperature inert atmosphere to form silicate, which can be conveniently removed by washing, thus forming the nano-silicon inlaid three-dimensional honeycomb carbon composite material with a hollow structure. The preparation method provided by the invention adopts the raw materials which are low in price and easy to obtain, has a simple preparation process and can realize mass preparation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a Scanning Electron Microscope (SEM) image of a nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material in example 1: magnification of 1 ten thousand times;
fig. 2 is a Scanning Electron Microscope (SEM) image of the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material in example 1: magnification of 5 ten thousand times;
fig. 3 is a graph of cycle performance of a nano-silicon-inlaid three-dimensional honeycomb carbon composite negative electrode material of example 1 and a lithium ion battery assembled from silicon-superconducting carbon of comparative example 1.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The drugs/reagents used are all commercially available without specific description.
The invention provides a nano-silicon inlaid three-dimensional honeycomb carbon composite anode material which is characterized by comprising nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer.
The nanocrystallization and the porosification can effectively inhibit structural damage caused by volume expansion in the circulation process of the silicon negative electrode, so that the electrochemical activity and the stability of the silicon negative electrode are improved; the carbon layer is coated on the surface of the active silicon nano particles or a conductive network is constructed, so that on one hand, the electronic conductivity between the silicon particles can be effectively improved, the capacity and the rate capability are improved, and on the other hand, the stability of the SEI film can be improved, and the cycle performance is improved. Therefore, the construction of the nano-silicon inlaid three-dimensional porous carbon composite anode structure is beneficial to fully utilizing the advantages of nanocrystallization, porosification and three-dimensional conductive network, and effectively improving the overall electrochemical performance of the silicon anode.
Preferably, the particle size of the nano silicon particles is 30-300 nm; the thickness of the carbon nano sheet is 5-50 nm, and the pore diameter of the three-dimensional honeycomb carbon in the three-dimensional honeycomb carbon porous network is 0.5-1.5 mu m; the thickness of the carbon layer coated on the surface of the nano silicon particle is 5-50 nm.
The invention also provides a preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises the following steps:
s1: adding nano silicon powder into a mixed solution containing a surfactant, stirring, uniformly dispersing by ultrasonic, sequentially adding resorcinol and formaldehyde, stirring at a set temperature for reaction, adding tetraethoxysilane, continuously stirring for reaction, filtering, washing and drying to obtain SiO 2 An @ RF @ Si precursor powder;
s2: ball-milling and uniformly mixing the precursor powder with organic acid sodium or organic acid potassium, and placing the mixture in an inert atmosphere for heat treatment to obtain sintered powder;
s3: and (3) placing the sintered powder into an aqueous solution for washing, filtering and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material.
Preferably, in step S1, the surfactant is at least one of dodecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and polyvinylpyrrolidone; the grain diameter of the nanometer silicon powder is 30-300 nm. Proper amount of surfactant is added to facilitate the uniform dispersion of the nano silicon powder in the solution.
Preferably, in step S1, the mixed solution is a mixed solution of water, alcohol and ammonia water, and the volume ratio of alcohol to water is 50-1: 1, the volume ratio of ammonia water to water is 1: 1-20.
Preferably, in step S1, the mass ratio of the surfactant to the mixed solution is 0.1-2: 100; the mol ratio of resorcinol to formaldehyde is 1: 1-2; the mass ratio of the nano silicon powder to the resorcinol is 0.2-20: 1, a carbon coating layer with a certain thickness is formed on the surface of nano silicon; the ratio of the nano silicon powder to the mixed solution is 0.01-0.5 g:100ml, so that the nano silicon powder is fully and uniformly dispersed in the solution; the ratio of the ethyl orthosilicate to the nanometer silicon powder is 5-10 ml:0.2g. The proper proportion of the solvent and the reaction raw materials is beneficial to controlling the reaction rate to uniformly coat the phenolic resin on the surface of the nano silicon.
Preferably, in step S1, the stirring reaction at the set temperature is specifically: the reaction is carried out for 12-36 hours at 20-80 ℃, so that the reaction rate of the phenolic resin is controlled, and the uniform coating is realized to obtain the phenolic resin coated silicon powder RF@Si;
the continuous stirring reaction of the added tetraethoxysilane specifically comprises the following steps: the reaction is carried out for 2 to 10 hours at the temperature of 20 to 60 ℃ so as to be beneficial to controlling the reaction rate of the tetraethoxysilane, and a layer of SiO is uniformly coated on the surface of the phenolic resin coated silicon powder RF@Si 2 An inorganic layer.
Preferably, in step S2, the organic acid sodium is sodium citrate or sodium ascorbate; the organic acid potassium is potassium citrate or potassium ascorbate, forms sodium/potassium carbonate through subsequent high-temperature heat treatment, promotes cracking and carbonization of carbon-containing materials, and contributes to forming three-dimensional honeycomb carbon consisting of carbon nano-sheets.
The mass ratio of the precursor powder to the organic acid sodium or organic acid potassium is 0.1-2: 1, proper reactant proportion is selected to help the carbon coated silicon particles to be uniformly distributed in a three-dimensional honeycomb carbon network consisting of carbon nano-sheets, and simultaneously, the organic acid sodium/potassium and SiO at high temperature are facilitated 2 The inorganic layer reacts to form a water-soluble silicate, which is readily removed during subsequent water washing.
Preferably, in step S2, the inert atmosphere is Ar gas, N 2 Or Ar/H 2 Cracking phenolic resin and organic sodium/potassium into carbon under inert atmosphere, and simultaneously preventing silicon from oxidizing; the temperature of the heat treatment is 500-800 ℃ and the time is 0.1-2 h, so that the phenolic resin and the organic acid sodium/potassium are carbonized and cracked completely, and simultaneously the organic acid sodium/potassium and SiO are promoted at high temperature 2 The inorganic layer reacts thoroughly to form a water-soluble silicate.
Preferably, in step S3, the ratio of the sintered powder to the aqueous solution is 0.1 to 10g:100ml of the water solution is selected to be suitable for effectively removing the water-soluble silicate and saving the cost.
The invention also provides application of the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material, and the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material is used as a lithium ion battery anode; the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material is the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material or the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material prepared by the preparation method; the mass fraction of silicon in the nano-silicon embedded three-dimensional honeycomb carbon composite anode material is 10-80 wt%.
Example 1
The embodiment provides a nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer. The particle size of the nano silicon is 70-100 nm, the thickness of the carbon nano sheet is 20-50 nm, and the pore diameter of the three-dimensional honeycomb carbon is 1-3 mu m.
The invention also provides a preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises the following steps:
(1) Adding 1.5g of nano silicon powder with the particle size of 80-100 nm into a mixed solution of 80ml of water containing 0.2g of dodecyl trimethyl ammonium bromide, 320ml of ethanol and 6ml of ammonia water, stirring, uniformly dispersing by ultrasonic, sequentially adding 10ml of ethanol solution containing 2.0 g resorcinol and 2.4g of formaldehyde solution, stirring at 30 ℃ for reacting for 12 hours, finally adding 6ml of tetraethoxysilane, continuously stirring for reacting for 3 hours, filtering, washing and drying to obtain SiO 2 Precursor powder of @ rf @ si;
(2) Taking 1.0 g precursor powder and 2g sodium citrate, ball-milling and mixing uniformly, heating to 500 ℃ under high-purity Ar atmosphere, reacting for 0.5h at constant temperature, and naturally cooling to obtain black powder;
(3) And (3) placing the obtained black sintered powder into 100ml of aqueous solution, washing to remove soluble impurities such as sodium silicate, filtering, and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material.
As shown in fig. 1 and 2, which are SEM images of the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material prepared in this embodiment, it can be seen from the figures that the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material prepared in this embodiment is composed of three-dimensional porous honeycomb carbon composed of carbon nano-sheets uniformly distributed with carbon coated with nano-silicon, the particle size of the nano-silicon is 70-100 nm, the thickness of the carbon nano-sheets is 20-50 nm, and the pore diameter of the three-dimensional honeycomb carbon is 1-3 um.
The nano silicon-inlaid three-dimensional honeycomb carbon composite anode material prepared in the embodiment can be used for anode materials of lithium ion batteries, and the silicon-carbon nano tube composite material, superconducting carbon and adhesive LA133 are mixed according to the mass ratio of 8:1:1 dispersing in aqueous solution (solid content 20%) and stirring for 12h to obtain uniform silicon anode slurry, coating the slurry on copper foil by using a bar knife coater, drying, and cutting into pole pieces with diameter of 12mm, wherein the silicon loading capacity on the pole pieces is 1.0mg/cm 2 The pole piece is adoptedAnd assembling the lithium battery, the lithium negative electrode and the diaphragm into a lithium ion battery in a glove box, and performing charge-discharge and cycle performance tests.
FIG. 3 is a graph showing the cycle performance of the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material prepared in this example and the silicon-superconducting carbon composite anode prepared in comparative example 1, wherein the first discharge capacity of the silicon-carbon nanotube composite anode is 2542.6mAh/g at 0.1C rate, the discharge capacity after 25 cycles is 2158.7mAh/g, and the capacity retention rate is 84.9%. Compared with the silicon-superconducting carbon composite anode prepared in comparative example 2 (the first discharge capacity is 2246mAh/g, 454.9mAh/g after 25 times of circulation, and the capacity retention rate is 20.2%), the discharge capacity and the circulation performance are both obviously improved.
Example 2
The embodiment provides a nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer. The grain diameter of the nano silicon is 100-150 nm, and the thickness of the carbon nano sheet is 10-20 nm.
The invention also provides a preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises the following steps:
(1) Adding 1.5g of nano silicon powder with the particle size of 100-150 nm into a mixed solution of 80ml of water containing 0.3g of dodecyl trimethyl ammonium bromide, 320ml of ethanol and 10ml of ammonia water, stirring, uniformly dispersing by ultrasonic, sequentially adding 10ml of ethanol solution containing 2.0 g resorcinol and 2.4g of formaldehyde solution, stirring at 30 ℃ for reacting for 12 hours, finally adding 10ml ethyl orthosilicate, continuously stirring for reacting for 2 hours, filtering, washing and drying to obtain SiO 2 Precursor powder of @ rf @ si;
(2) 1.0 g of SiO was taken 2 Uniformly ball-milling and mixing the @ RF @ Si precursor powder and 1.5g of potassium citrate, heating to 600 ℃ under high-purity Ar atmosphere, reacting for 0.5h at constant temperature, and naturally cooling to obtain black powder;
(3) And (3) placing the obtained black sintered powder into 100ml of aqueous solution, washing to remove soluble impurities such as potassium silicate, filtering, and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material.
Example 3
The embodiment provides a nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises nano-silicon particles and carbon nano-sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer. The grain diameter of the nano silicon is 100-150 nm, and the thickness of the carbon nano sheet is 10-20 nm.
The invention also provides a preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material, which comprises the following steps:
(1) Adding 1.5g of nano silicon powder with the particle size of 100-150 nm into a mixed solution of 80ml of water containing 0.3g of dodecyl trimethyl ammonium bromide, 320ml of ethanol and 10ml of ammonia water, stirring, uniformly dispersing by ultrasonic, sequentially adding 10ml of ethanol solution containing 2.0 g resorcinol and 2.4g of formaldehyde solution, stirring at 30 ℃ for reacting for 12 hours, finally adding 10ml ethyl orthosilicate, continuously stirring for reacting for 2 hours, filtering, washing and drying to obtain SiO 2 An @ RF @ Si precursor powder;
(2) 1.0 g of SiO was taken 2 Uniformly ball-milling and mixing the @ RF @ Si precursor powder and 3g sodium ascorbate, heating to 600 ℃ under high-purity Ar atmosphere, reacting for 1h at constant temperature, and naturally cooling to obtain black powder;
(3) And (3) placing the obtained black sintered powder into 100ml of aqueous solution, washing to remove soluble impurities such as sodium silicate, filtering, and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material.
Comparative example 1
The comparative example proposes a preparation method of a silicon-superconducting carbon composite anode material, which comprises the following steps: grinding or ball milling 0.15g of nano silicon powder (with the particle size of 80-100 nm) and 0.04g of superconducting carbon for 1h to obtain the silicon-superconducting carbon composite anode material.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The preparation method of the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material is characterized by comprising the following steps of:
s1: adding nano silicon powder into a mixed solution containing a surfactant, stirring, performing ultrasonic dispersion uniformly, sequentially adding resorcinol and formaldehyde, stirring at 20-80 ℃ for reaction for 12-36 h, adding ethyl orthosilicate, stirring at 20-60 ℃ for reaction for 2-10 h, filtering, washing and drying to obtain SiO 2 Precursor powder of @ rf @ si; the mixed solution is a mixed solution of water, alcohol and ammonia water;
s2: ball-milling and uniformly mixing the precursor powder with organic acid sodium or organic acid potassium, and placing the mixture in an inert atmosphere for heat treatment to obtain sintered powder; the organic acid sodium is sodium citrate or sodium ascorbate; the organic acid potassium is potassium citrate or potassium ascorbate; the temperature of the heat treatment is 500-800 ℃ and the time is 0.1-2 h;
s3: placing the sintered powder into an aqueous solution for washing, filtering and drying to obtain the nano-silicon inlaid three-dimensional honeycomb carbon composite anode material; the composite anode material comprises nano silicon particles and carbon nano sheets; the carbon nano-sheets are assembled into a three-dimensional honeycomb carbon porous network, and the nano-silicon particles are uniformly distributed in the three-dimensional honeycomb carbon porous network; and the surfaces of the nano silicon particles are coated with a carbon layer.
2. The preparation method according to claim 1, wherein in step S1, the surfactant is at least one of dodecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and polyvinylpyrrolidone; the grain diameter of the nanometer silicon powder is 30-300 nm.
3. The preparation method of claim 1, wherein in step S1, the volume ratio of alcohol to water in the mixed solution is 50-1: 1, the volume ratio of ammonia water to water is 1: 1-20.
4. A method according to any one of claims 1 to 3, wherein in step S1, the mass ratio of the surfactant to the mixed solution is 0.1 to 2:100; the mol ratio of resorcinol to formaldehyde is 1: 1-2; the mass ratio of the nano silicon powder to the resorcinol is 0.2-20: 1, the ratio of the nano silicon powder to the mixed solution is 0.01-0.5 g:100ml; the ratio of the ethyl orthosilicate to the nanometer silicon powder is 5-10 ml:0.2g.
5. The preparation method according to claim 1, wherein in step S2, the mass ratio of the precursor powder to the organic acid sodium or organic acid potassium is 0.1 to 2:1.
6. the method according to claim 1, wherein in step S2, the inert atmosphere is Ar/H 2 Or (3) Ar gas or N 2 。
7. The nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material is characterized by being prepared by the preparation method of any one of claims 1-6.
8. The nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material of claim 7, wherein the particle size of the nano-silicon particles is 30-300 nm; the thickness of the carbon nano sheet is 5-50 nm, and the pore diameter of the three-dimensional honeycomb carbon in the three-dimensional honeycomb carbon porous network is 0.5-1.5 mu m; the thickness of the carbon layer coated on the surface of the nano silicon particle is 5-50 nm.
9. The application of the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material is characterized in that the nano-silicon-inlaid three-dimensional honeycomb carbon composite anode material is used as a lithium ion battery anode; the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material is prepared by the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material of claim 7 or 8 or the preparation method of any one of claims 1-6.
10. The application of the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material according to claim 9, wherein the mass fraction of silicon in the nano-silicon-embedded three-dimensional honeycomb carbon composite anode material is 10-80 wt%.
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| CN115763822B (en) * | 2023-01-06 | 2023-08-04 | 碳佳(北京)科技有限公司 | Silicon-carbon negative electrode composite material, application and lithium battery |
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