CN118367134A - Micron silicon-carbon negative electrode material and preparation method of micron silicon-carbon negative electrode piece - Google Patents
Micron silicon-carbon negative electrode material and preparation method of micron silicon-carbon negative electrode piece Download PDFInfo
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- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 38
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 38
- CWVRJTMFETXNAD-FWCWNIRPSA-N 3-O-Caffeoylquinic acid Natural products O[C@H]1[C@@H](O)C[C@@](O)(C(O)=O)C[C@H]1OC(=O)\C=C\C1=CC=C(O)C(O)=C1 CWVRJTMFETXNAD-FWCWNIRPSA-N 0.000 claims abstract description 34
- PZIRUHCJZBGLDY-UHFFFAOYSA-N Caffeoylquinic acid Natural products CC(CCC(=O)C(C)C1C(=O)CC2C3CC(O)C4CC(O)CCC4(C)C3CCC12C)C(=O)O PZIRUHCJZBGLDY-UHFFFAOYSA-N 0.000 claims abstract description 34
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- CWVRJTMFETXNAD-KLZCAUPSSA-N Neochlorogenin-saeure Natural products O[C@H]1C[C@@](O)(C[C@@H](OC(=O)C=Cc2ccc(O)c(O)c2)[C@@H]1O)C(=O)O CWVRJTMFETXNAD-KLZCAUPSSA-N 0.000 claims abstract description 34
- CWVRJTMFETXNAD-JUHZACGLSA-N chlorogenic acid Chemical compound O[C@@H]1[C@H](O)C[C@@](O)(C(O)=O)C[C@H]1OC(=O)\C=C\C1=CC=C(O)C(O)=C1 CWVRJTMFETXNAD-JUHZACGLSA-N 0.000 claims abstract description 34
- 229940074393 chlorogenic acid Drugs 0.000 claims abstract description 34
- FFQSDFBBSXGVKF-KHSQJDLVSA-N chlorogenic acid Natural products O[C@@H]1C[C@](O)(C[C@@H](CC(=O)C=Cc2ccc(O)c(O)c2)[C@@H]1O)C(=O)O FFQSDFBBSXGVKF-KHSQJDLVSA-N 0.000 claims abstract description 34
- 235000001368 chlorogenic acid Nutrition 0.000 claims abstract description 34
- BMRSEYFENKXDIS-KLZCAUPSSA-N cis-3-O-p-coumaroylquinic acid Natural products O[C@H]1C[C@@](O)(C[C@@H](OC(=O)C=Cc2ccc(O)cc2)[C@@H]1O)C(=O)O BMRSEYFENKXDIS-KLZCAUPSSA-N 0.000 claims abstract description 34
- 239000011230 binding agent Substances 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 21
- 239000010405 anode material Substances 0.000 claims abstract description 19
- 239000000378 calcium silicate Substances 0.000 claims abstract description 19
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 19
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 18
- 239000003292 glue Substances 0.000 claims abstract description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000010000 carbonizing Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 7
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 7
- 238000007581 slurry coating method Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000003763 carbonization Methods 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 12
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 8
- 238000000576 coating method Methods 0.000 abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 35
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012300 argon atmosphere Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002003 electrode paste Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- 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
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a micron silicon-carbon negative electrode material and a preparation method of a micron silicon-carbon negative electrode piece. Dissolving chlorogenic acid in ethanol, adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating to obtain chlorogenic acid coated composite material; and carbonizing the chlorogenic acid coated composite material at high temperature under inert gas to obtain the micron silicon-carbon anode material. Adding a binder into water to prepare a glue solution, adding lithium titanate and the micron silicon-carbon negative electrode material prepared by the method according to any one of claims 1-5 into the glue solution, mixing into slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The method can effectively improve the specific capacity, coulombic efficiency, multiplying power performance, cycle stability and energy density of the anode material, and improve the service life and safety of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of negative electrode materials, in particular to a micron silicon-carbon negative electrode material and a preparation method of a micron silicon-carbon negative electrode piece.
Background
Currently, the energy storage devices of various electric and electronic devices are mainly lithium ion batteries. Compared with other energy storage devices, the lithium ion battery has higher energy density and smaller volume, and is widely applied to the fields of electric energy storage, electric vehicles, portable electronic device energy supply and the like. However, currently, the current mainstream commercial lithium ion battery anode-graphite anode has gradually failed to meet the requirements of electric energy storage, electric vehicles and electronic devices for high performance lithium ion batteries in terms of energy density and system integration. This is because the theoretical specific capacity of the graphite anode is lower, only 372mAh/g, and the reversible specific capacity of the graphite anode material at present is close to the theoretical value. Therefore, graphite negative electrode materials have no rising space, and new negative electrode materials must be developed to meet the market demand for high performance lithium batteries.
Among the numerous lithium ion battery anode materials, silicon is currently the most desirable anode material to replace graphite. However, silicon anodes undergo severe volume expansion (> 300%) during charge and discharge due to the lithium intercalation/deintercalation process of silicon, and generate extreme stresses. This has serious consequences for the silicon anode: (1) The silicon is continuously pulverized in charge and discharge overcharge, so that the integrity of the silicon cathode is broken; (2) stress causes the silicon negative electrode and the current collector to separate; (3) Silicon powder causes the solid electrolyte interface layer (SEI) to continuously "grow-break-regenerate", continuously consuming lithium ions. This series of processes accelerates the collapse of the silicon anode and the deterioration of the battery capacity. In addition, the extremely poor electron conductivity of silicon also makes the electrochemical dynamic performance of the silicon negative electrode poor, and severely restricts the large-scale commercial use of the silicon negative electrode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a micron silicon-carbon negative electrode material and a preparation method of a micron silicon-carbon negative electrode plate, which can effectively improve the specific capacity, coulombic efficiency, rate capability, cycle stability and energy density of the negative electrode material and improve the service life and safety of a lithium ion battery.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the preparation method of the micron silicon-carbon anode material comprises the following steps:
(a) Dissolving chlorogenic acid in ethanol, adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating to obtain chlorogenic acid coated composite material;
(b) And (3) carbonizing the chlorogenic acid coated composite material at a high temperature under inert gas to obtain the micron silicon-carbon anode material.
Further, in the step (a), the mass ratio of chlorogenic acid to micron silicon and calcium silicate nano whisker is (90-100): 1: (0.2-0.5).
Further, in the step (a), the ratio of chlorogenic acid to ethanol is 90-100g:10mL.
Further, in the step (a), the evaporation temperature is 80-90 ℃ and the evaporation time is 1-2h.
Further, in the step (b), the high-temperature carbonization temperature is 500-600 ℃ and the treatment time is 1-4 hours.
The preparation method of the micron silicon carbon negative electrode plate comprises the steps of adding a binder into water to prepare a glue solution, adding lithium titanate and micron silicon carbon negative electrode materials into the glue solution, mixing to prepare slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon carbon negative electrode plate.
Further, the binder is carboxymethyl cellulose, and the mass ratio of the binder to water is 1:40-50.
Further, the mass ratio of the binder to lithium titanate to the micrometer silicon used in the preparation of the micrometer silicon-carbon anode material is 1:0.5-1:9-12.
Further, the slurry coating thickness is 0.1 to 0.3mm.
Further, the drying temperature is 110-120 ℃, and the drying time is 10-15h.
The beneficial effects of the invention are as follows:
The lithium ion battery is characterized in that micron silicon is used as an active material, chlorogenic acid is used for coating the micron silicon and the calcium silicate nanowhisker, and the micron silicon and the calcium silicate nanowhisker are compounded with lithium titanate, so that the volume expansion in the charge and discharge process can be slowed down, direct contact between the micron silicon and electrolyte is prevented, the specific capacity, coulomb efficiency, multiplying power performance, cycle stability and energy density of the cathode material can be effectively improved, and therefore the lithium ion battery with long service life and high safety is obtained through assembly, and the requirements of power batteries, consumer batteries and energy storage battery markets on the high-performance lithium ion battery are met.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
The preparation method of the modified micron silicon-carbon negative electrode material and the micron silicon-carbon negative electrode plate comprises the following steps:
(a) Dissolving chlorogenic acid in ethanol, adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating at 80-90 ℃ for 1-2h to obtain chlorogenic acid coated composite material; the mass ratio of chlorogenic acid to ethanol to micrometer silicon to calcium silicate nano whisker is (90-100) g:10mL:1g: (0.2-0.5) g.
(B) And (3) carbonizing the chlorogenic acid coated composite material at high temperature (carbonization temperature is 500-600 ℃ and treatment time is 1-4 hours) under inert gas (nitrogen, argon or mixed gas of the nitrogen and the argon), and cooling the material to room temperature to obtain the micron silicon-carbon anode material.
(C) Adding a binder into water to prepare a glue solution (the binder is carboxymethyl cellulose, the mass ratio of the binder to the water is 1:40-50), adding a micron silicon-carbon negative electrode material and lithium titanate into the glue solution, mixing to obtain a slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The mass ratio of the binder to lithium titanate to the micrometer silicon used in the preparation of the micrometer silicon-carbon anode material is 1:0.5-1:9-12; the thickness of the slurry coating is 0.1-0.3mm; the drying temperature is 110-120 ℃, and the drying time is 10-15h.
The specific embodiment is as follows:
Example 1 preparation of micron SiCcarbon negative electrode Material and micron SiCcarbon negative electrode sheet
(A) Dissolving chlorogenic acid in ethanol (the dosage ratio of chlorogenic acid to ethanol is 100g:10 mL), adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating at 80 ℃ for 1.5h to obtain a chlorogenic acid coated composite material; chlorogenic acid and ethanol, micron silicon and calcium silicate nanowhisker dosage ratio is 100g:10mL:1g:0.3g.
(B) And (3) carbonizing the chlorogenic acid coated composite material at high temperature in an argon atmosphere (heating to 500 ℃ at a speed of 5 ℃/min and treating for 1h at 500 ℃), and cooling the material to room temperature to obtain the micron silicon-carbon anode material.
(C) Adding a binder into water to prepare a glue solution (the binder is carboxymethyl cellulose, the mass ratio of the binder to the water is 1:47), adding a micron silicon-carbon negative electrode material and lithium titanate into the glue solution, mixing into a slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The mass ratio of the binder to lithium titanate to the micrometer silicon used for preparing the micrometer silicon-carbon anode material is 1:0.5:10; the thickness of the slurry coating is 0.2mm; the drying temperature was 110℃and the drying time was 15 hours.
Example 2 preparation of micron SiCcarbon negative electrode Material and micron SiCcarbon negative electrode sheet
(A) Dissolving chlorogenic acid in ethanol (the dosage ratio of chlorogenic acid to ethanol is 90g:10 mL), adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating at 80 ℃ for 1.5h to obtain a chlorogenic acid coated composite material; chlorogenic acid and ethanol/micron silicon and calcium silicate nanowhisker weight ratio is 90g:10mL:1g:0.2g.
(B) And (3) carbonizing the chlorogenic acid coated composite material at high temperature in an argon atmosphere (heating to 500 ℃ at a speed of 5 ℃/min and treating for 1h at 500 ℃), and cooling the material to room temperature to obtain the micron silicon-carbon anode material.
(C) Adding a binder into water to prepare a glue solution (the binder is carboxymethyl cellulose, the mass ratio of the binder to the water is 1:45), adding a micron silicon-carbon negative electrode material and lithium titanate into the glue solution, mixing into a slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The mass ratio of the binder to lithium titanate to the micrometer silicon used for preparing the micrometer silicon-carbon anode material is 1:0.6:11; the thickness of the slurry coating is 0.2mm; the drying temperature was 110℃and the drying time was 15 hours.
Comparative example 1
(A) Dissolving chlorogenic acid in ethanol (the dosage ratio of chlorogenic acid to ethanol is 100g:10 mL), adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating at 80 ℃ for 1.5h to obtain a chlorogenic acid coated composite material; the mass ratio of chlorogenic acid to micron silicon and calcium silicate nano whisker is 100:1:0.3.
(B) Adding a binder into water to prepare a glue solution (the binder is carboxymethyl cellulose, the mass ratio of the binder to the water is 1:47), adding chlorogenic acid coated composite material and lithium titanate into the glue solution, mixing to obtain a slurry, coating the slurry on the surface of a conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The mass ratio of the binder to the lithium titanate to the micrometer silicon used for preparing the chlorogenic acid coated composite material is 1:0.5:10; the thickness of the slurry coating is 0.2mm; the drying temperature was 110℃and the drying time was 15 hours.
Comparative example 2
(A) Adding the pickled micrometer silicon and calcium silicate nano whisker powder into ethanol, uniformly mixing, and evaporating at 80 ℃ for 1.5 hours to obtain a mixture, wherein the dosage ratio of the ethanol to the micrometer silicon to the calcium silicate nano whisker is 10mL:1g:0.3g;
(b) Carbonizing the mixture at high temperature in argon atmosphere (heating to 500 ℃ at a speed of 5 ℃/min, and treating for 1h at 500 ℃), and cooling the material to room temperature to obtain the micron silicon-carbon anode material;
(c) Adding the binder into water to prepare a glue solution, adding the micron silicon-carbon negative electrode material and lithium titanate into the glue solution, mixing into slurry, coating the slurry on the surface of the conductive substrate, and drying to prepare the micron silicon-carbon negative electrode plate. The mass ratio of the micrometer silicon to the calcium silicate nano whisker is 1:0.3; the binder is carboxymethyl cellulose, and the mass ratio of the binder to water is 1:47; the mass ratio of the binder to the micrometer silicon used for preparing the micrometer silicon-carbon anode material is 1:10:0.5; the thickness of the slurry coating is 0.2mm; the drying temperature was 110℃and the drying time was 15 hours.
Comparative example 3
The negative electrode material and negative electrode tab were prepared as in example 1, but without the addition of calcium silicate nanowhiskers in step (a).
Comparative example 4
The negative electrode material and negative electrode tab were prepared as in example 1, but no lithium titanate was added in step (c).
The negative electrode materials prepared in example 1 and comparative examples 1 to 4 were assembled into button-type and soft-pack lithium ion batteries, and the performance was tested, and the results are shown in Table 1 (the extensibility was tested according to YBT 5289-2017 electrode paste extensibility test method).
TABLE 1
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (10)
1. The preparation method of the micron silicon-carbon anode material is characterized by comprising the following steps of:
(a) Dissolving chlorogenic acid in ethanol, adding the pickled micrometer silicon and calcium silicate nano whisker powder, uniformly mixing, and evaporating to obtain chlorogenic acid coated composite material;
(b) And (3) carbonizing the chlorogenic acid coated composite material at a high temperature under inert gas to obtain the micron silicon-carbon anode material.
2. The preparation method of the micron silicon-carbon anode material according to claim 1, wherein in the step (a), the mass ratio of chlorogenic acid to micron silicon and calcium silicate nanowhiskers is (90-100): 1: (0.2-0.5).
3. The method for preparing the micron silicon-carbon negative electrode material according to claim 1, wherein in the step (a), the ratio of chlorogenic acid to ethanol is 90-100g:10mL.
4. The method for preparing a micron silicon-carbon negative electrode material according to claim 1, wherein in the step (a), the evaporation temperature is 80-90 ℃ and the evaporation time is 1-2h.
5. The method for preparing a micron silicon-carbon negative electrode material according to claim 1, wherein in the step (b), the high-temperature carbonization temperature is 500-600 ℃ and the treatment time is 1-4 hours.
6. A method for preparing a micron silicon-carbon negative electrode plate, which is characterized in that a binder is added into water to prepare a glue solution, lithium titanate and the micron silicon-carbon negative electrode material prepared by the method according to any one of claims 1-5 are added into the glue solution, the glue solution is mixed into slurry, the slurry is coated on the surface of a conductive substrate, and the conductive substrate is dried to prepare the micron silicon-carbon negative electrode plate.
7. The preparation method of the micron silicon-carbon negative electrode plate according to claim 6, wherein the binder is carboxymethyl cellulose, and the mass ratio of the binder to water is 1:40-50.
8. The preparation method of the micron silicon-carbon negative electrode plate according to claim 6, wherein the mass ratio of the binder to lithium titanate to the micron silicon used in the preparation of the micron silicon-carbon negative electrode material is 1:0.5-1:9-12.
9. The method for preparing the micron silicon-carbon negative electrode plate according to claim 6, wherein the thickness of the slurry coating is 0.1-0.3mm.
10. The method for preparing the micron silicon-carbon negative electrode plate according to claim 6, wherein the drying temperature is 110-120 ℃ and the drying time is 10-15h.
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