CN115377355A - Pure silicon cathode and preparation method and application thereof - Google Patents

Pure silicon cathode and preparation method and application thereof Download PDF

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Publication number
CN115377355A
CN115377355A CN202211080429.7A CN202211080429A CN115377355A CN 115377355 A CN115377355 A CN 115377355A CN 202211080429 A CN202211080429 A CN 202211080429A CN 115377355 A CN115377355 A CN 115377355A
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Prior art keywords
silicon
negative electrode
pure silicon
electrolyte
solid
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Chinese (zh)
Inventor
李刚
陈规伟
冀亚娟
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Eve Energy Co Ltd
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Eve Energy Co Ltd
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    • 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
    • H01M4/134—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
    • 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
    • H01M4/13—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
    • 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 pure silicon negative electrode and a preparation method and application thereof, wherein the pure silicon negative electrode comprises a current collector and an active substance layer arranged on the surface of the current collector, the active substance layer comprises silicon, a binder, an electrolyte and a conductive agent, the particle size of the silicon is 0.5-10 mu m, the pure silicon is used as a negative electrode active material, the pure silicon negative electrode can exert the advantage of high capacity of the silicon to the maximum extent and avoid the occurrence of various side reactions, and the advantages of the pure silicon and an all-solid-state battery can be exerted and the disadvantages of the pure silicon and the all-solid-state battery can be complemented and improved by combining the pure silicon and the all-solid-state battery.

Description

Pure silicon cathode and preparation method and application thereof
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a pure silicon cathode and a preparation method and application thereof.
Background
The domestic electric vehicle market is developed rapidly due to a series of national subsidy policies for the electric vehicle industry. However, based on the existing liquid electrolyte lithium ion power battery system, the energy density and safety performance of the battery after 2025 years cannot meet the national requirements. The use of a nonflammable solid electrolyte instead of a conventional liquid electrolyte can increase the energy density of the battery by about 66% while securing the safety performance of the battery, and thus the solid battery is considered to be an important direction of the next-generation battery technology.
The current major problem limiting the application of solid-state lithium batteries is the low energy density and power density of the batteries. Because the solid electrolyte used by the solid battery is generally thicker than the diaphragm used by the liquid battery, the energy density of the solid lithium battery can meet the requirement only when the material used by the negative electrode is greatly higher than the specific capacity of the graphite material. Silicon as a battery cathode not only has extremely high specific capacity, but also has rich storage capacity and no safety risk, is an ideal lithium battery cathode material, but also has the obvious defect that the volume can be violently expanded after lithium is embedded, and the electrical property is rapidly attenuated due to the structural damage caused by repeated volume change in the cycle process.
CN110233282A discloses an all-solid-state battery with a silicon cathode and a sulfide solid electrolyte, which comprises a battery core, wherein the battery core comprises a cathode, a solid electrolyte layer and an anode, the cathode comprises a current collector and a lithium embedding layer which is laminated and fixed on the side surface of the current collector, the lithium embedding layer is formed by pressing mixed powder comprising sulfide electrolyte powder particles and silicon cathode powder, the silicon content in the mixed powder is 40-53 wt%, the particle size of the sulfide electrolyte powder particles is 10-100 nm, the particle size of the silicon cathode powder is 10-100 nm, the porosity of the lithium embedding layer is 15-23%, the lithium embedding layer can adaptively adjust the expansion/contraction caused in the process of removing lithium embedding from the silicon cathode powder, the possibility of cracking of the lithium embedding layer is reduced, and the electric contact stability of the lithium embedding layer with the current collector and the solid electrolyte layer is ensured, so that the capacity attenuation of the high-silicon cathode solid-state battery is slowed down, and the cycle performance of the high-silicon cathode solid-state battery is improved.
CN112310361A discloses a silicon oxide negative electrode material, an electrode, a preparation method and an application thereof. Which comprises the following steps: under the condition of inert atmosphere, carrying out primary heat treatment and secondary heat treatment on the preimpregnated silicon negative electrode material to obtain the silicon negative electrode material; the preimpregnated silicon negative electrode material is powder obtained by drying a mixed solution of lithiation solution and silicon monoxide; the first coating agent in the first heat treatment is a substance which contains fluorine element and can release or decompose fluorine-containing gas below 500 ℃; in the second heat treatment, the second coating agent is carbon-containing organic gas or solid carbon-containing organic matter or liquid carbon-containing organic matter which can be gasified to form carbon-containing gas at the temperature of below 500 ℃.
The common method for improving the volume expansion and the cycle performance of the silicon cathode is to use silicon carbide, silicon oxide or mix with graphite, but the methods not only seriously affect the capacity exertion of the silicon, but also cause a series of complex side reactions and lower electrochemical performance.
Disclosure of Invention
The pure silicon cathode is used as a cathode active material, can exert the advantage of high capacity of silicon to the maximum extent and avoid various side reactions, and can exert the advantages of the pure silicon and the all-solid-state battery and complement and improve the disadvantages of the pure silicon and the all-solid-state battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a pure silicon anode, including a current collector and an active material layer disposed on a surface of the current collector, the active material layer including silicon, a binder, an electrolyte, and a conductive agent, the silicon having a particle size of 0.5 to 10 μm, for example: 0.5 μm,1 μm, 2 μm, 5 μm, 8 μm, 10 μm, or the like.
According to the invention, the pure silicon material is used as the cathode of the solid electrolyte, no side reaction occurs between the pure silicon material and the electrolyte, the stability of the battery is effectively improved, the pure silicon can exert the high capacity advantage to the maximum extent, the battery core has extremely high energy density, when the silicon grain diameter is less than 0.5 μm, the raw material preparation cost is too high, meanwhile, when the large specific surface area causes the side reaction to increase, the first effect is reduced, when the grain diameter is more than 10 μm, the repeated change of the volume in the circulation process easily causes the grain breakage, and the structural integrity is damaged.
Preferably, the morphology of the silicon comprises any one of a sphere, a rod or a flake or a combination of at least two, preferably a sphere.
Preferably, the silicon has a purity of > 99%.
Preferably, the binder includes any one of polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), sodium carboxymethyl cellulose (CMC), or Styrene Butadiene Rubber (SBR), or a combination of at least two thereof.
Preferably, the conductive agent comprises any one of or a combination of at least two of conductive carbon black, conductive graphite, carbon fiber, or carbon nanotube.
Preferably, the electrolyte comprises any one of a halide, a sulfide or an oxide or a combination of at least two thereof.
Preferably, the morphology of the electrolyte is spherical.
Preferably, the particle size of the electrolyte is 0.1 to 0.5 μm, for example: 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, or the like.
The electrolyte with smaller particle size is just complementary with the silicon particles with larger particle size, so that the pores can be better filled, the contact between the electrolyte and the silicon particles is increased, the stress of the silicon particles can be relieved by the softer electrolyte, and the damage of the silicon particles is reduced.
Preferably, the mass ratio of the silicon, the binder, the electrolyte and the conductive agent is (77-88.9): 0.1-1): 10-20): 0.5-2, such as: 80.
When the addition amount of the binder is less than 0.1%, the low binder content leads to the situation that the binder molecules cannot effectively wrap the silicon particles, the silicon particles cannot be completely connected, the film forming structural strength is poor, the silicon particles cannot be normally used, and when the addition amount is higher than 1%, the too high binder causes the situation that the contact among the silicon particles is reduced, the transmission of ions and electrons is hindered, and the performance of the electrical property of a negative electrode is not facilitated.
In a second aspect, the present invention provides a method for preparing a pure silicon anode as described in the first aspect, the method comprising the steps of:
(1) Mixing a binder and a solvent to obtain a glue solution, adding silicon particles, an electrolyte and a conductive agent into the glue solution, and adjusting the viscosity and the solid content to obtain a negative electrode slurry;
(2) And coating the negative electrode slurry on the surface of a current collector, and drying to obtain the pure silicon negative electrode.
Preferably, the mixing speed of step (1) is 1500 to 2500rpm, for example: 1500rpm, 1800rpm, 2000rpm, 2200rpm, 2500rpm, or the like.
Preferably, the mixing time is from 100 to 150min, for example: 100min, 110min, 120min, 130min, 140min or 150min and the like.
Preferably, the solid content of the anode slurry in the step (1) is 40 to 60%, for example: 40%, 45%, 50%, 55%, 60%, etc.
Preferably, the viscosity of the negative electrode slurry is 4000 to 5000mPa · s, for example: 4000 mPas, 4200 mPas, 4500 mPas, 4800 mPas, or 5000 mPas.
When the viscosity is less than 4000mPa & s, the slurry is too thin, so that the surface density is not uniform and the thickness is not uniform during coating, when the viscosity is more than 5000mPa & s, the sizing material is too thick, the slurry cannot be normally coated during coating, the coating thickness is also non-uniform, the viscosity of the slurry is generally controlled by solid content, usually, the solid content is slightly high in the homogenizing process, the viscosity is slightly high, and the solid content is reduced by increasing a solvent so as to achieve the required viscosity.
Preferably, the thickness of the current collector in the step (2) is 5 to 10 μm, for example: 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm, etc.
Preferably, the thickness of the coating is 20 to 40 μm, for example: 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, or the like.
Coating thickness is obtained according to the face capacity and the face density that design, and the thickness size influences electric core performance greatly, and pole piece face capacity is low excessively when thickness is less than 20 mu m, can cause electric core energy density low, and too high face capacity can cause electric core too thick, causes the electrode polarization increase, influences battery performance.
Preferably, the temperature of the drying is 100 to 150 ℃, for example: 100 ℃, 110 ℃,120 ℃, 130 ℃, 140 ℃ or 150 ℃, etc.
Preferably, the drying time is 10-15 h, for example: 10h, 11h, 12h, 13h, 14h or 15h, etc.
In a third aspect, the present invention provides an all-solid-state battery comprising a pure silicon negative electrode as defined in the first aspect.
The invention gives a certain pressure to the negative plate in the process of preparing the solid-state battery, the external pressure has great influence on the performance of the silicon negative electrode all-solid-state battery, under a larger pressure, the silicon negative electrode is more fully contacted with the solid-solid interface of the solid electrolyte, the interface impedance can be effectively reduced, the larger pressure can also reduce the volume expansion of the silicon negative electrode in charging and discharging, the close contact of the interface is continuously maintained after the volume change, the electrical property is greatly improved, but the excessive pressure can limit the volume expansion of the silicon negative electrode, the lithium is difficult to be embedded, the failure of effective lithium embedding can cause the great reduction of the reversible capacity, and the high capacity of the silicon negative electrode is not favorably exerted, therefore, the reasonable selection of the pressure is very important. Reasonable pressure range is 50MPa to 100MPa (preferably 75 MPa). Below 50MPa will result in reduced cycle performance, and above 100MPa will result in reduced capacity. Compared with various composite silicon materials, the pure silicon material can effectively avoid the occurrence of side reactions per se, the stability of the pure silicon material and various solid electrolytes is very excellent, the all-solid-state battery has no liquid electrolyte, the continuous reaction of silicon and the electrolyte can be avoided, the solid-state battery can also provide certain external pressure, and the external pressure can slow down the volume change of a silicon cathode and the structural damage caused by the change.
In order to improve the structural stability of the solid-state battery, in the charging and discharging process of the solid-state battery, the first 2 times of charging and discharging are carried out by adopting 0.1C low multiplying power, a stainless steel clamp is used for applying 150MPa high voltage outside the battery, and after 2 cycles, the battery core is taken out of the clamp, so that the structural stability process is completed. Because silicon can take place the inflation after lithium is inlayed, the expanded silicon can occupy the hole of negative pole during first charging, lead to the porosity to show and reduce, the density improves, first discharge can cause the violent shrink of volume again, produce a large amount of holes, if stable solid interface contact can not appear at this moment will produce adverse effect to subsequent circulation stability, first 2 circulations carry out under higher constant voltage and can make the silicon negative pole still keep complete solid contact interface after discharging, effectively improve the structural stability of electric core.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the pure silicon material is used as the cathode of the solid electrolyte, no side reaction occurs between the pure silicon material and the electrolyte, the stability of the battery is effectively improved, the high capacity advantage of the pure silicon can be exerted to the greatest extent, and the battery core has extremely high energy density.
(2) The invention gives a certain pressure to the negative plate in the process of preparing the solid-state battery, the external pressure has great influence on the performance of the silicon negative electrode all-solid-state battery, under a larger pressure, the silicon negative electrode is more fully contacted with the solid-solid interface of the solid electrolyte, the interface impedance can be effectively reduced, the larger pressure can also reduce the volume expansion of the silicon negative electrode in charging and discharging, the close contact of the interface is continuously maintained after the volume change, the electrical property is greatly improved, but the excessive pressure can limit the volume expansion of the silicon negative electrode, the lithium is difficult to be embedded, the failure of effective lithium embedding can cause the great reduction of the reversible capacity, and the high capacity of the silicon negative electrode is not favorably exerted, therefore, the reasonable selection of the pressure is very important.
(3) The pure silicon cathode all-solid-state battery prepared by the invention has the advantages that the 3C discharge capacity retention rate can reach 90.12%, the capacity retention rate can reach 95.48% after the battery is cycled for 100 circles at 1C, and the pure silicon cathode all-solid-state battery has excellent rate performance and cycling stability.
Detailed Description
The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a pure silicon negative electrode, and a preparation method of the pure silicon negative electrode comprises the following steps:
(1) Mixing PVDF and NMP solvent to obtain glue solution with solid content of 6%, mixing spherical silicon particles with the particle size of 2 microns and the purity of 99.9%, spherical yttrium lithium chloride electrolyte with the particle size of 0.3 microns and conductive carbon black with the glue solution, adding NMP to adjust the solid content to obtain negative electrode slurry with the solid content of 50% and the viscosity of 4500mPa.s, wherein in the solid of the negative electrode slurry, the silicon content accounts for 80%, the yttrium lithium chloride content accounts for 18%, the PVDF content accounts for 0.5%, and the conductive carbon black content accounts for 1.5%;
(2) And coating the cathode slurry on the surface of a copper foil with the thickness of 8 mu m, wherein the coating thickness is 30 mu m, and drying at 120 ℃ for 12h to obtain the pure silicon cathode.
Example 2
The embodiment provides a pure silicon negative electrode, and a preparation method of the pure silicon negative electrode comprises the following steps:
(1) Mixing PAA and NMP solvent to obtain glue solution with solid content of 6%, mixing flaky silicon particles with the particle size of 8 mu m and the purity of 99.9%, spherical yttrium lithium chloride electrolyte with the particle size of 0.5 mu m and carbon nano tubes with the glue solution, adding NMP to adjust the solid content to obtain negative electrode slurry with the solid content of 50% and the viscosity of 4500mPa.s, wherein in the solid of the negative electrode slurry, the silicon content accounts for 85%, the yttrium lithium chloride content accounts for 14%, the PVDF content accounts for 0.1%, and the conductive carbon black content accounts for 0.9%;
(2) And coating the cathode slurry on the surface of a copper foil with the thickness of 8 mu m, wherein the coating thickness is 30 mu m, and drying at 120 ℃ for 12h to obtain the pure silicon cathode.
Example 3
This example is different from example 1 only in that the mass ratio of the binder in the solids of the negative electrode slurry was 0.05%, and the film formation was not possible under the same conditions and parameters as in example 1.
Example 4
This example is different from example 1 only in that the binder content in the solid of the anode slurry was 1.5% by mass, and the other conditions and parameters were exactly the same as those of example 1.
Example 5
This example is different from example 1 only in that the viscosity of the negative electrode slurry was 3500mPa · s, and the other conditions and parameters were exactly the same as those of example 1.
Example 6
This example is different from example 1 only in that the viscosity of the negative electrode slurry was 5500mPa · s, and other conditions and parameters were completely the same as those of example 1.
Example 7
This example is different from example 1 only in that the coating thickness is 15 μm, and other conditions and parameters are exactly the same as example 1.
Example 8
This example differs from example 1 only in that the coating thickness was 45 μm, and the other conditions and parameters were exactly the same as those of example 1.
Comparative example 1
This comparative example is different from example 1 only in that the silicon particles have a particle size of 0.3 μm, and other conditions and parameters are exactly the same as those of example 1.
Comparative example 2
This comparative example is different from example 1 only in that the silicon particles have a particle size of 12 μm and other conditions and parameters are exactly the same as those of example 1.
And (4) performance testing:
the required all-solid-state soft package battery can be obtained by laminating, packaging, isostatic pressing and other steps of the silicon negative electrode plate, an all-solid-state battery positive electrode plate and a solid electrolyte membrane, wherein the positive electrode plate is an NCM positive electrode, and is prepared by uniformly stirring NCM, PVDF, conductive carbon black and lithium yttrium chloride in NMP according to the proportion of 80; the solid electrolyte membrane is a yttrium chloride lithium electrolyte membrane, and is prepared by dissolving yttrium chloride lithium and SBR in 97% by weight in n-heptane, coating the solution on a PET film, drying and removing the PET film. The solid-state battery was subjected to a performance test, and the test results are shown in table 1:
TABLE 1
Figure BDA0003832873750000091
In Table 1, example 3 failed to form a film and was not tested and was marked as "-".
As can be seen from Table 1, in the example 1-2, the ACR of the pure silicon negative electrode can reach less than 26.15m omega, the discharge capacity retention rate of the battery 3C prepared by the pure silicon negative electrode can reach more than 88.25 percent, and the capacity retention rate can reach more than 93.69 percent after 100 cycles at 1C.
Compared with the embodiment 1 and the embodiments 3 to 4, in the preparation process of the pure silicon negative electrode piece, after the binder is dissolved in the solvent, the molecular chain is in an unfolded state, the molecular chain can be fully contacted and wound with the silicon particles, when the addition amount of the binder is less than 0.1%, the low binder content causes that the binder molecules cannot effectively wrap the silicon particles, the silicon particles cannot be completely connected, the film-forming structural strength is poor, the normal use is impossible, and when the addition amount is more than 1%, the too high binder causes that the contact among the silicon particles is reduced, the transmission of ions and electrons is blocked, and the performance of the electrical property of the negative electrode is not facilitated.
Compared with the examples 5 to 6, in the preparation process of the pure silicon negative electrode plate, the viscosity of the slurry affects the performance of the prepared electrode plate, when the viscosity is less than 4000mPa · s, the slurry is too thin, the surface density and the thickness are uneven when the slurry is coated, when the viscosity is more than 5000mPa · s, the glue is too thick, the slurry cannot be normally coated when the slurry is coated, the coating thickness is uneven, the viscosity of the slurry is generally controlled by solid content, usually, the solid content is slightly high in the homogenizing process, the viscosity is slightly high, and the solid content is reduced by increasing a solvent to reach the required viscosity.
Compared with the embodiment 1 and the embodiments 7 to 8, the preparation process of the pure silicon negative pole piece of the invention has the advantages that the coating thickness of the slurry can influence the performance of the prepared pole piece, when the thickness is less than 20 mu m, the surface capacity of the pole piece is too low, the energy density of a battery cell is low, when the surface capacity is too high, the battery cell is too thick, the polarization of the electrode is increased, and the performance of the battery is influenced
Compared with the comparative examples 1 and 2, the silicon particle size used in the invention can obviously affect the performance of the prepared pure silicon pole piece, when the silicon particle size is less than 0.5 μm, the raw material preparation cost is overhigh, meanwhile, when the specific surface area is overlarge, side reaction is increased, the first effect is reduced, when the particle size is more than 10 μm, the repeated change of the volume in the circulation process can easily cause the particle fracture, and the structural integrity is damaged.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. The pure silicon negative electrode is characterized by comprising a current collector and an active substance layer arranged on the surface of the current collector, wherein the active substance layer comprises silicon, a binder, an electrolyte and a conductive agent, and the particle size of the silicon is 0.5-10 mu m.
2. The pure silicon anode according to claim 1, wherein the morphology of the silicon comprises any one of spherical, rod-like or flake-like or a combination of at least two thereof, preferably spherical;
preferably, the silicon has a purity of > 99%.
3. The pure silicon negative electrode of claim 1 or 2, wherein the binder comprises any one of polyvinylidene fluoride, polyacrylic acid, sodium carboxymethylcellulose, or styrene butadiene rubber, or a combination of at least two thereof;
preferably, the conductive agent comprises any one of or a combination of at least two of conductive carbon black, conductive graphite, carbon fiber, or carbon nanotubes.
4. The pure silicon anode according to any one of claims 1 to 3, wherein the electrolyte comprises any one of a halide, a sulfide or an oxide or a combination of at least two thereof;
preferably, the morphology of the electrolyte is spherical;
preferably, the particle size of the electrolyte is 0.1 to 0.5 μm.
5. The pure silicon negative electrode as claimed in any one of claims 1 to 4, wherein the mass ratio of the silicon, the binder, the electrolyte and the conductive agent is (77-88.9), (0.1-1), (10-20) and (0.5-2).
6. A method for preparing a pure silicon anode according to any one of claims 1 to 5, comprising the steps of:
(1) Mixing a binder and a solvent to obtain a glue solution, adding silicon particles, an electrolyte and a conductive agent into the glue solution, and adjusting the viscosity and the solid content to obtain a negative electrode slurry;
(2) And coating the negative electrode slurry on the surface of a current collector, and drying to obtain the pure silicon negative electrode.
7. The method of claim 6, wherein the mixing in step (1) is performed at a speed of 1500 to 2500rpm;
preferably, the mixing time is 100 to 150min.
8. The production method according to claim 6 or 7, wherein the solid content of the negative electrode slurry in the step (1) is 40 to 60%;
preferably, the viscosity of the negative electrode slurry is 4000 to 5000mPa · s.
9. The manufacturing method according to any one of claims 6 to 8, wherein the thickness of the current collector in the step (2) is 5 to 10 μm;
preferably, the thickness of the coating is 20 to 40 μm;
preferably, the drying temperature is 100-150 ℃;
preferably, the drying time is 10-15 h.
10. An all-solid-state battery comprising the pure silicon negative electrode according to any one of claims 1 to 5.
CN202211080429.7A 2022-09-05 2022-09-05 Pure silicon cathode and preparation method and application thereof Pending CN115377355A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117374373A (en) * 2023-11-23 2024-01-09 高能时代(珠海)新能源科技有限公司 All-solid-state soft-package battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117374373A (en) * 2023-11-23 2024-01-09 高能时代(珠海)新能源科技有限公司 All-solid-state soft-package battery

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