CN112436131A - Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction - Google Patents
Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction Download PDFInfo
- Publication number
- CN112436131A CN112436131A CN202011426521.5A CN202011426521A CN112436131A CN 112436131 A CN112436131 A CN 112436131A CN 202011426521 A CN202011426521 A CN 202011426521A CN 112436131 A CN112436131 A CN 112436131A
- Authority
- CN
- China
- Prior art keywords
- composite material
- molten salt
- silicon
- attapulgite
- carbon composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a method for preparing a silicon-carbon composite material by using molten salt to assist magnesiothermic reduction, which comprises the steps of firstly carbonizing alginate and attapulgite serving as raw materials at high temperature to obtain an amorphous carbon coating-coated attapulgite composite material, then adding a reducing agent and molten salt to perform heat-assisted reduction reaction, and performing acid pickling treatment to obtain the silicon-carbon composite material. The invention realizes the method for preparing the silicon-carbon composite material by combining high-temperature carbonization and low-temperature molten salt heat assistance, effectively reduces the generation of silicon carbide through the molten salt heat assistance reduction reaction, and the carbon coating in the prepared silicon-carbon composite material coats silicon nano particles reduced by attapulgite and forms a gap structure through acid etching. The composite material is used for a lithium ion battery cathode material, and the carbon layer, the gaps and the porous structure can effectively relieve the volume expansion effect caused in the lithium intercalation and deintercalation process, and simultaneously improve the electronic conductivity, so that the composite material has excellent electrochemical lithium storage performance.
Description
Technical Field
The invention relates to a method for preparing a silicon-carbon composite material by molten salt assisted magnesiothermic reduction, which is mainly used for a lithium ion battery cathode material and belongs to the technical field of composite materials and new energy.
Background
The endurance of new energy automobiles and electronic products depends on the energy density of batteries, and with the continuous increase of consumer demand, automobiles and electronic products with long endurance are deeply favored by consumers. Therefore, the search for high energy density batteries will be the direction and power of future development. Of all the materials that can fulfill this need, silicon-based materials are one of the most promising candidates due to their high theoretical capacity (Si, 4200 mAh g)-1) Low operating potential, wide source and the like, so that the material becomes a high-hotspot material in application research. However, the silicon negative electrode material generates huge volume expansion (-300%) and serious interface side reaction in the processes of lithium intercalation and lithium deintercalation, which are key problems preventing the silicon negative electrode material from further realizing high-energy density stable application, and the problems can be solved to the greatest extent by reasonably designing the structure of the silicon negative electrode material and coating the carbon layer. Meanwhile, the method is also important for the selection of a silicon source and a carbon source, and the research on the preparation and the application of the silicon source and the carbon source is very important.
Attapulgite, also called attapulgite, is a natural inorganic material with wide source and low cost, and the ideal chemical component is Mg5Si8O20(OH)2(H2O)4.nH2O, wherein SiO2The content is about 57 percent, and SiO in the pretreated attapulgite2In an amount ofThe silicon nano material is improved to more than 65 percent, and the silicon nano material obtained by reducing the silicon nano material as a silicon source has wide application prospect and practical significance. Alginate is a pure natural polysaccharide and is a high-viscosity polymer compound. Because the silicon anode material has high-strength viscosity, the silicon anode material is selected as a carbon source to more easily realize the coating effect of a carbon coating, so that the silicon anode material has excellent specific capacity and long cycle service life. Therefore, the application of the attapulgite in the aspect of silicon-based negative electrode materials has profound influence, great application prospect and economic and commercial values.
The invention patent (publication number: CN 109873150A) discloses a method for directly reducing palygorskite into silicon nano-particles at high temperature, and then compounding the silicon nano-particles with carbon source graphene to obtain a silicon-carbon composite material. The reduction temperature used in the patent is high, the process is complex, and the preparation process comprises the steps of firstly reducing at high temperature to obtain a silicon simple substance, and then carrying out carbonization coating on the silicon simple substance to prepare the silicon-carbon composite material.
Disclosure of Invention
The invention aims to provide a method for preparing a silicon-carbon composite material by using molten salt to assist magnesiothermic reduction.
Preparation of silicon-carbon composite material
The method for preparing the silicon-carbon composite material by using the molten salt to assist the magnesiothermic reduction comprises the following steps of:
(1) pretreating attapulgite, uniformly dispersing in an ethanol-water mixed solution to obtain an attapulgite dispersion liquid, dissolving alginate in deionized water to obtain an alginate solution, uniformly mixing the attapulgite dispersion liquid and the alginate solution, stirring, and carbonizing at high temperature under the protection of inert gas to obtain the amorphous carbon coating-coated attapulgite composite material. The attapulgite pretreatment comprises the steps of drying and dewatering the attapulgite at 100-300 ℃, and then washing the attapulgite with HCl with the concentration of 2-10 mol/L. In the ethanol-water mixed solution, the volume ratio of ethanol to water is 1: 0.25-1: 4. The alginate is potassium alginate or sodium alginate. The mass ratio of the alginate to the attapulgite is 1: 1-1: 5. The high-temperature carbonization temperature is 700-1000 ℃, and the high-temperature carbonization time is 1-5 h.
(2) Mixing the amorphous carbon coating coated attapulgite composite material, reducing agent magnesium powder and molten salt, reacting for 2-8 h at 650-850 ℃ under the protection of inert gas, cooling to room temperature, washing with hydrochloric acid and hydrofluoric acid, washing with deionized water and absolute ethyl alcohol, and drying to obtain the silicon-carbon composite material. Wherein the mass ratio of the amorphous carbon coating coated attapulgite composite material to the reducing agent magnesium powder is 1: 1-1: 5. The molten salt is sodium chloride or potassium chloride, and the mass ratio of the amorphous carbon coating coated attapulgite composite material to the molten salt is 1: 10-1: 30.
Structural characterization of di-silicon-carbon composite material
The structure of the silicon-carbon composite material prepared by the invention is characterized by an X-ray diffraction pattern (XRD) and a Scanning Electron Microscope (SEM).
FIG. 1 is an X-ray diffraction pattern (XRD) of a silicon carbon composite material prepared according to the present invention. It can be seen from fig. 1 that the diffraction peaks of the silicon-carbon composite materials prepared in examples 1 and 2 completely coincide with the strong diffraction peak of the simple substance Si phase (JCPDS card number 27-1402), indicating that the silicon-carbon composite material was successfully synthesized, and it can be seen from the figure that the material prepared in example 2 contains a large amount of impurity silicon carbide, indicating that the reduction temperature is increased and the content of the impurity silicon carbide is increased.
Fig. 2 is a Scanning Electron Microscope (SEM) image of the silicon carbon composite material prepared by the present invention. The morphology of the silicon-carbon composite materials prepared in examples 1 and 2 can be seen from fig. 2, and it can be seen from both figures that the reduced silicon nanoparticles are coated in the carbon layer and agglomerated into a large block, and the void-groove structure formed by acid etching can also be seen. The particles in example 1 were found to be smaller than those in example 2 by comparison, indicating that an increase in the reduction temperature would result in an increase in the sample particles.
Performance test of silicon-carbon composite material as negative electrode material of lithium ion battery
The test method comprises the following steps: grinding a certain amount of silicon-carbon composite material, sodium alginate and acetylene black to prepare slurry, assembling the slurry into a button cell, and testing the cycle performance of the button cell by adopting a blue test system.
FIG. 3 is a cycle performance diagram of the silicon-carbon composite material prepared by the invention as a lithium ion battery cathode. It can be seen from FIG. 3 that the silicon-carbon composite materials prepared in examples 1 and 2 are 200mA g/g when used as the negative electrode material of a lithium ion battery-1Respectively has 1221.1 mAh g at current density-1、1352.8 mAh g-1The initial reversible specific capacity of the catalyst is 68.66 percent and 59.38 percent respectively. After 100 cycles, the reversible specific capacity is respectively maintained at 731.3 mAh g-1And 514.7 mAh g-1The silicon-carbon composite material prepared by the invention has good cycling stability.
In conclusion, the invention uses alginate and attapulgite as raw materials, firstly carries out high-temperature carbonization to obtain the amorphous carbon coating coated attapulgite composite material, then adds a reducing agent and molten salt to carry out heat-assisted reduction reaction, and carries out acid pickling treatment to obtain the silicon-carbon composite material. The invention realizes the method for preparing the silicon-carbon composite material by combining high-temperature carbonization and low-temperature molten salt heat assistance, effectively reduces the generation of silicon carbide through the molten salt heat assistance reduction reaction, and the carbon coating in the prepared silicon-carbon composite material coats silicon nano particles reduced by attapulgite and forms a gap structure through acid etching. The composite material is used for a lithium ion battery cathode material, and the carbon layer, the gaps and the porous structure can effectively relieve the volume expansion effect caused in the lithium intercalation and deintercalation process, and simultaneously improve the electronic conductivity, so that the composite material has excellent electrochemical lithium storage performance.
Drawings
FIG. 1 is an X-ray diffraction pattern (XRD) of a silicon carbon composite material prepared according to various embodiments of the present invention;
FIG. 2 is a Scanning Electron Microscope (SEM) image of a silicon carbon composite material prepared according to various embodiments of the present invention;
fig. 3 is a graph of cycle performance of the silicon-carbon composite material prepared in different embodiments of the present invention as a negative electrode of a lithium ion battery.
Detailed Description
The preparation and properties of the silicon-carbon composite material of the present invention are described in detail by the following specific examples.
Example 1
(1) Firstly drying attapulgite at 200 deg.C to remove water, washing with 4mol/L HCl solution, and uniformly dispersing 2g pretreated attapulgite in 300mL ethanol-water mixed solution (V)Ethanol: VWater (W)=1: 4), obtaining attapulgite dispersion liquid; dissolving 2g of sodium alginate in 100ml of deionized water to form a sodium alginate solution; mixing and stirring the attapulgite dispersion liquid and the sodium alginate solution, and carbonizing at 800 ℃ for 5 hours under the protection of inert gas to obtain the amorphous carbon coating-coated attapulgite composite material.
(2) Mixing the amorphous carbon coating coated attapulgite composite material with magnesium powder according to the mass ratio of 1:1, mixing and grinding the amorphous carbon coating coated attapulgite composite material with potassium chloride according to the mass ratio of 1:15, reacting for 5 hours at 650 ℃ under the protection of inert gas, cooling to room temperature, washing with hydrochloric acid and hydrofluoric acid, washing with deionized water and absolute ethyl alcohol, and drying to obtain the silicon-carbon composite material.
When the composite material is used as a negative electrode material of a lithium ion battery, the concentration of the composite material is 200mA g-1Has a current density of 1221.1 mAh g-1The initial reversible specific capacity of the catalyst is 68.66 percent in the first coulombic efficiency. After 100 cycles, 731.3 mAh g can be kept-1Has excellent cycle stability.
Example 2
(1) Firstly drying attapulgite at 300 deg.C to remove water, washing with 8mol/L HCl solution, and uniformly dispersing 4g pretreated attapulgite in 300mL ethanol-water mixed solution (V)Ethanol: VWater (W)=1: 4), obtaining attapulgite dispersion liquid; dissolving 2g of potassium alginate in 100ml of deionized water to form a potassium alginate solution; mixing and stirring the attapulgite dispersion liquid and the potassium alginate solution, and carbonizing at 900 ℃ for 2h under the protection of inert gas to obtain the amorphous carbon coating-coated attapulgite composite material.
(2) Mixing the amorphous carbon coating coated attapulgite composite material with magnesium powder according to the mass ratio of 1:3, mixing and grinding the amorphous carbon coating coated attapulgite composite material with potassium chloride according to the mass ratio of 1:25, reacting for 6 hours at 750 ℃ under the protection of inert gas, cooling to room temperature, washing with hydrochloric acid and hydrofluoric acid, washing with deionized water and absolute ethyl alcohol, and drying to obtain the silicon-carbon composite material.
When the composite material is used as a negative electrode material of a lithium ion battery, the concentration of the composite material is 200mA g-1Has a current density of 1352.8 mAh g-1The first coulombic efficiency of the reversible specific capacity is 59.38 percent. After 100 cycles, 514.7 mAh g can be maintained-1Has good cycle stability.
Claims (9)
1. A method for preparing a silicon-carbon composite material by molten salt assisted magnesiothermic reduction comprises the following steps:
(1) pretreating attapulgite, uniformly dispersing in an ethanol-water mixed solution to obtain an attapulgite dispersion liquid, dissolving alginate in deionized water to obtain an alginate solution, mixing the attapulgite dispersion liquid and the alginate solution, stirring, and carbonizing at high temperature under the protection of inert gas to obtain an amorphous carbon coating coated attapulgite composite material;
(2) mixing the amorphous carbon coating coated attapulgite composite material, reducing agent magnesium powder and molten salt, reacting for 2-8 h at 650-850 ℃ under the protection of inert gas, cooling to room temperature, washing with hydrochloric acid and hydrofluoric acid, washing with deionized water and absolute ethyl alcohol, and drying to obtain the silicon-carbon composite material.
2. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (1), the attapulgite is pretreated by drying and dewatering the attapulgite at 100-300 ℃, and then washing the attapulgite with HCl with the concentration of 2-10 mol/L.
3. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (1), the volume ratio of ethanol to water in the ethanol-water mixed solution is 1: 0.25-1: 4.
4. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (1), the alginate is potassium alginate or sodium alginate.
5. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (1), the mass ratio of the alginate to the attapulgite is 1: 1-1: 5.
6. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (1), the high-temperature carbonization temperature is 700-1000 ℃, and the high-temperature carbonization time is 1-5 h.
7. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (2), the mass ratio of the amorphous carbon coating coated attapulgite composite material to the reducing agent magnesium powder is 1: 1-1: 5.
8. The method for preparing the silicon-carbon composite material by the molten salt assisted magnesiothermal reduction according to claim 1, wherein the molten salt assisted magnesiothermal reduction comprises the following steps: in the step (2), the molten salt is sodium chloride or potassium chloride, and the mass ratio of the amorphous carbon coating coated attapulgite composite material to the molten salt is 1: 10-1: 30.
9. The silicon-carbon composite material prepared by the method of claim 1 is used as a negative electrode material of a lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426521.5A CN112436131B (en) | 2020-12-09 | 2020-12-09 | Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426521.5A CN112436131B (en) | 2020-12-09 | 2020-12-09 | Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112436131A true CN112436131A (en) | 2021-03-02 |
| CN112436131B CN112436131B (en) | 2023-01-06 |
Family
ID=74691805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011426521.5A Active CN112436131B (en) | 2020-12-09 | 2020-12-09 | Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112436131B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113998702A (en) * | 2021-10-13 | 2022-02-01 | 昆明理工大学 | Method for preparing Si/C negative electrode material by using micro silicon powder as raw material |
| CN115353118A (en) * | 2022-09-23 | 2022-11-18 | 淮阴工学院 | Method for modifying attapulgite clay by molten salt |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577082A (en) * | 2015-01-09 | 2015-04-29 | 南京大学 | Nano-silicon material and application thereof |
| CN105762338A (en) * | 2016-02-04 | 2016-07-13 | 天津大学 | Method for preparing lithium battery silicon carbon anode material by utilizing magnesiothermic reduction |
| CN106374088A (en) * | 2016-10-14 | 2017-02-01 | 浙江天能能源科技股份有限公司 | Method for preparing silicon/carbon composite material with magnesiothermic reduction process |
| CN106848273A (en) * | 2017-01-19 | 2017-06-13 | 深圳市沃特玛电池有限公司 | A kind of preparation method of Si-C composite material |
| CN108923039A (en) * | 2018-07-09 | 2018-11-30 | 天津工业大学 | A kind of preparation method of concave convex rod based nano silicon material |
| CN109286014A (en) * | 2018-11-23 | 2019-01-29 | 浙江众泰汽车制造有限公司 | A kind of Si-C composite material and its preparation method and application that surface is modified |
| CN109755482A (en) * | 2017-11-01 | 2019-05-14 | 同济大学 | Silicon/carbon composite and preparation method thereof |
| CN110783555A (en) * | 2019-09-16 | 2020-02-11 | 安徽若水化工有限公司 | Nano silicon material with low cost and high yield and preparation method thereof |
| CN110817881A (en) * | 2019-11-28 | 2020-02-21 | 中国科学院广州地球化学研究所 | Silicon-transition metal silicide nano composite material and preparation method and application thereof |
| CN111019249A (en) * | 2019-11-28 | 2020-04-17 | 柯祥 | Rubber and preparation process |
| CN111276683A (en) * | 2020-02-14 | 2020-06-12 | 中南大学 | Silicon dioxide sulfur positive electrode rich in aluminum hydroxyl and preparation method thereof |
| US20210359337A1 (en) * | 2019-03-18 | 2021-11-18 | Zhuhai Cosmx Battery Co., Ltd. | Composite material, preparation method thereof and lithium ion battery |
-
2020
- 2020-12-09 CN CN202011426521.5A patent/CN112436131B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577082A (en) * | 2015-01-09 | 2015-04-29 | 南京大学 | Nano-silicon material and application thereof |
| CN105762338A (en) * | 2016-02-04 | 2016-07-13 | 天津大学 | Method for preparing lithium battery silicon carbon anode material by utilizing magnesiothermic reduction |
| CN106374088A (en) * | 2016-10-14 | 2017-02-01 | 浙江天能能源科技股份有限公司 | Method for preparing silicon/carbon composite material with magnesiothermic reduction process |
| CN106848273A (en) * | 2017-01-19 | 2017-06-13 | 深圳市沃特玛电池有限公司 | A kind of preparation method of Si-C composite material |
| CN109755482A (en) * | 2017-11-01 | 2019-05-14 | 同济大学 | Silicon/carbon composite and preparation method thereof |
| CN108923039A (en) * | 2018-07-09 | 2018-11-30 | 天津工业大学 | A kind of preparation method of concave convex rod based nano silicon material |
| CN109286014A (en) * | 2018-11-23 | 2019-01-29 | 浙江众泰汽车制造有限公司 | A kind of Si-C composite material and its preparation method and application that surface is modified |
| US20210359337A1 (en) * | 2019-03-18 | 2021-11-18 | Zhuhai Cosmx Battery Co., Ltd. | Composite material, preparation method thereof and lithium ion battery |
| CN110783555A (en) * | 2019-09-16 | 2020-02-11 | 安徽若水化工有限公司 | Nano silicon material with low cost and high yield and preparation method thereof |
| CN110817881A (en) * | 2019-11-28 | 2020-02-21 | 中国科学院广州地球化学研究所 | Silicon-transition metal silicide nano composite material and preparation method and application thereof |
| CN111019249A (en) * | 2019-11-28 | 2020-04-17 | 柯祥 | Rubber and preparation process |
| CN111276683A (en) * | 2020-02-14 | 2020-06-12 | 中南大学 | Silicon dioxide sulfur positive electrode rich in aluminum hydroxyl and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 茹亚超等: "乳化-凝胶化法制备硅碳复合负极材料", 《第30届全国化学与物理电源学术年会》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113998702A (en) * | 2021-10-13 | 2022-02-01 | 昆明理工大学 | Method for preparing Si/C negative electrode material by using micro silicon powder as raw material |
| CN113998702B (en) * | 2021-10-13 | 2023-10-13 | 昆明理工大学 | Method for preparing Si/C anode material by taking micro silicon powder as raw material |
| CN115353118A (en) * | 2022-09-23 | 2022-11-18 | 淮阴工学院 | Method for modifying attapulgite clay by molten salt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112436131B (en) | 2023-01-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108767260B (en) | Carbon-coated FeP hollow nano-electrode material and preparation method and application thereof | |
| Gong et al. | Ultrasmall antimony nanodots embedded in carbon nanowires with three-dimensional porous structure for high-performance potassium dual-ion batteries | |
| CN104966824A (en) | Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof | |
| Nulu et al. | Silicon and porous MWCNT composite as high capacity anode for lithium-ion batteries | |
| CN107464938B (en) | Molybdenum carbide/carbon composite material with core-shell structure, preparation method thereof and application thereof in lithium air battery | |
| CN112436131B (en) | Method for preparing silicon-carbon composite material by molten salt assisted magnesiothermic reduction | |
| Yang et al. | Self-assembled FeF3 nanocrystals clusters confined in carbon nanocages for high-performance Li-ion battery cathode | |
| Jin et al. | Preparation and electrochemical properties of novel silicon-carbon composite anode materials with a core-shell structure | |
| CN110611092A (en) | Preparation method of nano silicon dioxide/porous carbon lithium ion battery cathode material | |
| CN113023705A (en) | Preparation method of hydrogen-rich carbon material and application of hydrogen-rich carbon material in lithium-sodium-potassium energy storage | |
| CN114314673B (en) | Preparation method of flaky FeOCl nano material | |
| Kong et al. | Hierarchical Co 1.4 Ni 0.6 P@ C hollow nanoflowers assembled from ultrathin nanosheets as an anode material for high-performance lithium-ion batteries | |
| CN112289985B (en) | C @ MgAl2O4Composite coating modified silicon-based negative electrode material and preparation method thereof | |
| CN111285375A (en) | Silicon nano material and preparation method and application thereof | |
| Chang et al. | Plasma-processed homogeneous magnesium hydride/carbon nanocomposites for highly stable lithium storage | |
| CN114105145B (en) | Carbon-coated three-dimensional porous silicon anode material and preparation method and application thereof | |
| CN114530598A (en) | Nitrogen-oxygen-sulfur doped carbon negative electrode material and preparation method and application thereof | |
| CN113540430A (en) | Preparation method and application of graphene-based composite electrode material | |
| CN111864204A (en) | Self-supporting graphene carbon conductive network material and preparation method and application thereof | |
| CN111063890A (en) | Graphene modified silicon-carbon material, preparation method and application thereof | |
| CN115092924B (en) | Serpentine-derived porous silicon nano-sheet negative electrode active material, preparation thereof and application thereof in lithium ion battery | |
| CN113422008B (en) | Synthesis method of micron-sized silicon monoxide @ carbon nanotube composite lithium ion battery anode material | |
| CN114436274B (en) | Method for preparing silicon-carbon nano hybrid material by wrapping silicon particles with neoprene and lithium ion battery cathode | |
| CN115832254B (en) | Silicon-carbon composite anode material and preparation method thereof | |
| CN117374262B (en) | Endogenous heterojunction anode material, preparation method thereof, negative electrode and lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |