CN114094076A - Negative plate and lithium ion battery comprising same - Google Patents
Negative plate and lithium ion battery comprising same Download PDFInfo
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- CN114094076A CN114094076A CN202111348705.9A CN202111348705A CN114094076A CN 114094076 A CN114094076 A CN 114094076A CN 202111348705 A CN202111348705 A CN 202111348705A CN 114094076 A CN114094076 A CN 114094076A
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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
- 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
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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
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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
- H01M4/36—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
- H01M4/581—Chalcogenides or intercalation compounds thereof
- H01M4/5815—Sulfides
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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
- H01M4/36—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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- 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 negative plate and a lithium ion battery comprising the same, wherein the negative plate comprises a negative current collector, a first negative active material layer and a second negative active material layer; the first negative active material layer includes a first negative active material selected from graphite, the second negative active material layer includes a second negative active material selected from SnS-MoS2. By introducing SnS-MoS into the negative plate2The quick charge performance of the lithium ion battery can be improved, and the negative active material in the negative plate can be improvedThe expansion and the crushing are realized, so that the volume expansion of the negative plate is relieved, and the long circulation stability of the lithium ion battery is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative plate and a lithium ion battery comprising the same.
Background
With the development of lithium ion secondary batteries, consumers have increasingly high demands on charging speed, endurance time, and safety performance. However, with the increase of the charging speed, under the condition of high-rate charging, the lithium precipitation phenomenon is easy to occur on the surface of the negative electrode due to the non-uniformity of the electrode potential and the electrolyte concentration of the negative electrode sheet of the lithium ion battery, and in addition, the expansion and crushing phenomenon of the negative electrode active material is easy to occur on the negative electrode sheet, which seriously affects the performance of the lithium ion battery.
Disclosure of Invention
The invention provides a negative plate and a lithium ion battery comprising the same, and aims to solve the problems that lithium is easy to precipitate on the surface of a negative electrode due to the nonuniformity of electrode potential and electrolyte concentration of the negative plate under the condition of high-rate charging of the conventional lithium ion battery, and a negative active material in the negative plate is expanded and crushed. The lithium ion battery assembled by the negative pole pieces has excellent cycle performance under the condition of high multiplying power, can avoid lithium precipitation of the negative pole pieces, and can improve the expansion and crushing of the negative pole active materials in the negative pole pieces, so that the volume expansion of the negative pole pieces is relieved, and the long cycle stability of the lithium ion battery is improved.
In the present invention, the "large rate" means a charge rate of 2C or more.
The purpose of the invention is realized by the following technical scheme:
a negative electrode sheet comprising a negative electrode current collector, a first negative electrode active material layer, and a second negative electrode active material layer; the first negative electrode active material layer is arranged on the first surface of the negative electrode current collector, and the second negative electrode active material layer is arranged on the surface of the first negative electrode active material layer;
the first negative active material layer includes a first negative active material selected from graphite, the second negative active material layer includes a second negative active material selected from SnS-MoS2。
According to the invention, the SnS-MoS2Has an interlayer covalent assembly structure.
According to the invention, the SnS-MoS2Is MoS covalently linked with SnS nano-dots2Hollow super-module made of nanosheets, i.e. said SnS-MoS2Is MoS covalently linked with SnS nano-dots2The nanosheets are made into hollow structures with interlayer covalent assembly, which can be used for high-rate lithium storage.
According to the invention, the SnS-MoS2Is prepared by the following method:
firstly, MoS2SiO modified by nano-sheet deposited on sulfonic acid group2On nanospheres, subsequent deposition of SnS on MoS2On the nano-scale, then SnS anchored MoS2The SnS-MoS is formed by covalently assembling nano sheets into a hollow super component2。
According to the invention, the SnS-MoS2In the formula, the mass percentage of SnS is 20 wt% -50 wt%, preferably 30 wt% -35 wt%.
Illustratively, the SnS-MoS2Has an interlayer covalent assembly structure and is prepared by adopting a hydrothermal method through covalent assembly. Specifically, the preparation method comprises the following steps:
firstly, SiO modified by sulfonic acid group2Nanospheres as template, which are dispersed in a dispersion containing Na2MoO4、Na2SnO3And CH3CSNH2In the reaction solution of (1); then, carrying out hydrothermal reaction to obtain the SnS-MoS with the interlayer covalent assembly structure2。
Wherein the temperature of the hydrothermal reaction is 160-300 ℃, such as 200 ℃; the hydrothermal reaction time is 8-16 hours, such as 12 hours.
During the hydrothermal reaction, due to sulfonic acid groups and MoO4 2-Interaction between anions, MoS with lower Ksp value2Preference is given to very small MoS2The nano-sheet is precipitated and deposited on SiO2The surface of the nanospheres; the active surface acts as a nucleation site to further promote the deposition of the SnS nanodots. SnS nano-dots in MoS2The tight anchoring of the nanoplate surface may limit the growth of the nanoplate thickness, promoting the growth of the nanoplate along a plane. Subsequently, MoS with large overlapping boundary regions2Continuous growth of the nanoplates triggers MoS using SnS nanodots as the linkage between the nanoplates2Covalent assembly of the nanoplates resulting in MoS2the/SnS nano-sheet completely covers the whole SiO2On the nanosphere. Finally, MoS2SnS removing SiO by simple etching process2SnS-MoS with interlayer covalent assembly structure is obtained after template of nanosphere2。
In the research process of the invention, the electrochemical theory calculation finds that in the negative plate, the potential of the active material layer close to the surface of the diaphragm is lower, the risk of lithium precipitation is higher, and the overall expansion rate of the lithium ion battery is further influenced. Based on the scheme, the invention provides the SnS-MoS2The lithium ion battery has an interlayer covalent assembly structure, so that the lithium ion battery has a lower Li ion diffusion potential barrier and lower hoop and radial tensile stress, the lower Li ion diffusion potential barrier can improve the quick charge performance of the lithium ion battery, and the lower hoop and radial tensile stress can improve the expansion and breakage of a negative active material in a negative plate, so that the volume expansion of the negative plate is relieved, and the long cycle stability of the lithium ion battery is improved.
According to the present invention, the median particle diameter Dv of the first negative electrode active material1 50Satisfies the following conditions: dv is less than or equal to 1 mu m1 50Less than or equal to 50 μm, preferably satisfying: dv is less than or equal to 5 mu m1 50Less than or equal to 25 mu m; for example, the median particle diameter Dv of the first negative electrode active material1 505 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm or 50 μm.
According to the present invention, the median particle diameter Dv of the second negative electrode active material2 50Satisfies the following conditions: dv is not less than 100nm2 50Less than or equal to 600 nm; for example, the median particle diameter Dv of the second negative electrode active material2 50Is 100nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm or 600 nm.
According to the invention, in the first negative electrode active materialMedian diameter Dv1 50And a median particle diameter Dv of the second negative electrode active material2 50The ratio of (A) to (B) satisfies: dv is not less than 81 50/Dv2 50200 or less, for example, the median particle diameter Dv of the first negative electrode active material1 50And a median particle diameter Dv of the second negative electrode active material2 50Is 8, 10, 20, 30, 40, 50, 75, 80, 90, 100, 120, 150, 180, or 200. When Dv is reached1 50/Dv2 50<When 8, it is shown that the particle diameter of the second negative electrode active material is too large, the conductivity of the second negative electrode active material itself is lowered, the rate capability is deteriorated, and when Dv is too large1 50/Dv2 50>At 200 f, it is shown that the particle size of the second negative electrode active material is too small, and at this time, the surface side reaction of the second negative electrode active material increases, and the cell cycle capacity retention ratio becomes low.
According to the present invention, the thickness L of the first anode active material layer110 to 200 μm, such as 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm.
According to the present invention, the thickness L of the first anode active material layer1And a thickness L of the second anode active material layer2Ratio L of2/L1Satisfies the following conditions: l is more than or equal to 0.052/L1≦ 0.15, e.g., thickness L of the first negative electrode active material layer1And a thickness L of the second anode active material layer2Ratio L of2/L10.05, 0.1 or 0.15. When L is2/L1<When the thickness of the second negative active material layer is 0.05, the thickness of the second negative active material layer is too small to improve the rate capability of the whole pole piece, and when L is less than L, the ratio performance of the whole pole piece is improved2/L1>At 0.15, it is shown that the thickness of the second negative electrode active material is too large, at which time the surface side reaction of the second negative electrode active material increases and the cell cycle capacity retention rate becomes low.
According to the invention, the negative current collector is selected from copper foils.
According to the invention, the thickness of the negative current collector is 6-12 μm.
According to the present invention, the first negative electrode active material layer is further provided on a second surface of the negative electrode current collector opposite to the first surface, and the second negative electrode active material layer is provided on a surface of the first negative electrode active material layer.
According to the present invention, the first anode active material layer further includes a first conductive agent and a first binder.
According to the present invention, the second anode active material layer further includes a second conductive agent and a second binder.
According to the present invention, the first anode active material layer includes the following components in mass fraction: 90-99.2 wt% of a first negative electrode active material, 0.2-4 wt% of a first conductive agent, and 0.6-6 wt% of a first binder.
According to the present invention, the second anode active material layer includes the following components in mass fraction: 90-99.2 wt% of a second negative electrode active material, 0.2-4 wt% of a second conductive agent, and 0.6-6 wt% of a second binder.
According to the present invention, the first negative active material is selected from artificial graphite and/or natural graphite.
According to the invention, the first conductive agent and the second conductive agent are the same or different and are independently selected from one or more of conductive carbon black, acetylene black, ketjen black, conductive graphite, conductive carbon fiber, carbon nano tube, metal powder and conductive fiber.
According to the invention, the first binder and the second binder are the same or different and are independently selected from one or more of polyvinyl alcohol, sodium carboxymethyl cellulose, styrene-butadiene latex, polytetrafluoroethylene and polyethylene oxide.
The invention also provides a preparation method of the negative plate, which comprises the following steps:
1) preparing slurry for forming a first negative electrode active material layer and slurry for forming a second negative electrode active material layer respectively;
2) and coating the slurry for forming the first negative electrode active material layer and the slurry for forming the second negative electrode active material layer on the first surface of the negative electrode current collector by using a double-layer coating machine to prepare the negative electrode sheet.
According to the present invention, in step 1), the solid contents of the slurry for forming the first anode active material layer and the slurry for forming the second anode active material layer are 40 wt% to 50 wt%.
According to the invention, in step 2), the slurry for forming the first negative electrode active material layer and the slurry for forming the second negative electrode active material layer are coated on a second surface, opposite to the first surface, of the negative electrode current collector to prepare the negative electrode sheet.
The invention also provides a lithium ion battery which comprises the negative plate.
According to the invention, the lithium ion battery further comprises a positive plate, a diaphragm and electrolyte.
The invention has the beneficial effects that:
the invention provides a negative plate and a lithium ion battery comprising the same, wherein the negative plate comprises a negative current collector, a first negative active material layer and a second negative active material layer; the first negative active material layer includes a first negative active material selected from graphite, the second negative active material layer includes a second negative active material selected from SnS-MoS2。
By introducing SnS-MoS into the negative plate2The lithium ion battery has the advantages that the quick charge performance of the lithium ion battery can be improved, the expansion and breakage of the negative active material in the negative plate are improved, the volume expansion of the negative plate is relieved, and the long cycle stability of the lithium ion battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode sheet according to a preferred embodiment of the present invention.
Reference numerals: 1 is a negative current collector; 2 is a first anode active material layer; and 3 is a second anode active material layer.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
In the description of the present invention, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and do not indicate or imply relative importance.
SnS-MoS used in the following examples2The material is prepared by the following method:
SiO modified with sulfonic acid group2Nanospheres dispersed in Na-containing solution2MoO4、Na2SnO3And CH3CSNH2In the reaction solution of (Na)2MoO4:Na2SnO3:CH3CSNH2SiO modified by sulfonic acid group2The mass ratio of the nanospheres is 1:1:2:1.2), hydrothermal reaction is carried out for 12h at 200 ℃, a hydrothermal product is washed and dried, and SiO is removed by an etching process2Nanospheres, SnS-MoS with interlayer covalent assembly structure2。
Example 1
(1) By the particle diameter Dv1 50Negative electrode slurry 1 was prepared for 15 μm artificial graphite as a first negative electrode active material: mixing artificial graphite, a conductive agent SP and a binder SBR according to a mass ratio of 96.8:1.2:2, dispersing the mixture in water, and uniformly stirring to prepare a negative electrode slurry 1, wherein the viscosity of the slurry is 2000-5000 mPa & s, and the solid content of the slurry is 40-50 wt%.
(2) By the particle diameter Dv2 50SnS-MoS of 300nm2Preparation of negative electrode slurry 2 using the material as a second negative electrode active material: SnS-MoS2Mixing the conductive agent SP and the binder SBR according to a mass ratio of 96.8:1.2:2, dispersing the mixture in water, and uniformly stirring to prepare negative electrode slurry 2, wherein the viscosity of the slurry is 2000-5000 mPa & s, and the solid content is40～50wt％。
(3) And (3) simultaneously coating the negative electrode slurry prepared in the steps (1) and (2) on a negative electrode current collector, wherein the negative electrode slurry 2 is borne on the negative electrode slurry 1, and the negative electrode slurry 1 is borne on the negative electrode current collector, so that the coating work of two sides of the negative electrode current collector is completed in the same way. The total thickness of the single surfaces of the negative plate after coating, drying and rolling is 55 μm, wherein the thickness of the first negative active material layer is 50 μm, and the thickness of the second negative active material layer is 5 μm.
(4) Mixing a positive electrode active material (lithium cobaltate), a conductive agent (conductive carbon black) and a binder (PVDF) according to a mass ratio of 96:2.5:1.5, dispersing the mixture in N-methyl pyrrolidone (NMP), uniformly stirring to prepare slurry, uniformly coating the slurry on the two side surfaces of an aluminum foil of a positive electrode current collector, and baking for 4-8 hours at 100-150 ℃ to prepare a positive electrode plate.
(5) And rolling, die cutting and cutting the obtained positive and negative electrode sheets, winding and assembling into a roll core, packaging with an aluminum plastic film after a short circuit test is qualified, baking in an oven to remove water until the water content reaches a water content standard required by liquid injection, injecting electrolyte, aging for 24-48h, and completing primary charging by a hot pressing formation process to obtain the activated lithium ion battery.
Examples 2 to 11
The other operations were the same as in example 1 except that the particle diameters of the first and second anode active materials were different and/or the thicknesses of the first and second anode active material layers were different, as specifically shown in table 1.
Comparative example 1
(1) By the particle diameter Dv1 50Negative electrode slurry 1 was prepared for 15 μm artificial graphite as a first negative electrode active material: mixing artificial graphite, a conductive agent SP and a binder SBR according to a mass ratio of 96.8:1.2:2, dispersing the mixture in water, and uniformly stirring to prepare a negative electrode slurry 1, wherein the viscosity of the slurry is 2000-5000 mPa & s, and the solid content of the slurry is 40-50 wt%.
(2) And (3) coating the negative electrode slurry prepared in the step (1) on a negative electrode current collector, wherein the negative electrode slurry 1 is carried on the negative electrode current collector, and coating work of two sides of the negative electrode current collector is completed in the same manner. The total thickness of the single surface of the negative electrode sheet after coating, drying and rolling is 55 μm, that is, the thickness of the first negative electrode active material layer is 55 μm.
(3) A positive electrode active material (lithium cobaltate), a conductive agent (conductive carbon black) and a binder (PVDF) are mixed according to a mass ratio of 96.5%: 2.5%: 1.5 percent of the components are mixed, dispersed in N-methyl pyrrolidone (NMP) and evenly stirred to prepare slurry, evenly coated on the two side surfaces of the aluminum foil of the positive current collector, and baked for 4 to 8 hours at the temperature of 100 ℃ and 150 ℃ to prepare the positive plate.
(4) And rolling, die cutting and cutting the obtained positive and negative electrode sheets, winding and assembling into a roll core, packaging with an aluminum plastic film after a short circuit test is qualified, baking in an oven to remove water until the water content reaches a water content standard required by liquid injection, injecting electrolyte, aging for 24-48h, and completing primary charging by a hot pressing formation process to obtain the activated lithium ion battery.
Comparative examples 2 to 3
The other operations were the same as in comparative example 1 except that the particle size of the first anode active material was different, as shown in table 1.
Comparative example 4
(1) By the particle diameter Dv2 50SnS-MoS of 300nm2Preparation of negative electrode slurry 2 using the material as a second negative electrode active material: SnS-MoS2The conductive agent SP and the binder SBR are mixed according to the mass ratio of 96.8:1.2:2, dispersed in water and uniformly stirred to prepare negative electrode slurry 2, the viscosity of the slurry is 2000-5000 mPa & s, and the solid content is 40-50 wt%.
(2) And (3) coating the negative electrode slurry prepared in the step (1) on the surfaces of two sides of a negative electrode current collector. The total thickness of the single surface of the negative electrode sheet after coating, drying and rolling is 55 μm, that is, the thickness of the second negative electrode active material layer is 55 μm.
(3) A positive electrode active material (lithium cobaltate), a conductive agent (conductive carbon black) and a binder (PVDF) are mixed according to a mass ratio of 96.5%: 2.5%: 1.5 percent of the components are mixed, dispersed in N-methyl pyrrolidone (NMP) and evenly stirred to prepare slurry, evenly coated on the two side surfaces of the aluminum foil of the positive current collector, and baked for 4 to 8 hours at the temperature of 100 ℃ and 150 ℃ to prepare the positive plate.
(4) And rolling, die cutting and cutting the obtained positive and negative electrode sheets, winding and assembling into a roll core, packaging with an aluminum plastic film after a short circuit test is qualified, baking in an oven to remove water until the water content reaches a water content standard required by liquid injection, injecting electrolyte, aging for 24-48h, and completing primary charging by a hot pressing formation process to obtain the activated lithium ion battery.
And (3) performance testing:
the lithium ion batteries prepared in the above examples and comparative examples were fully charged at 0.5C, and the ratio of the energy E of 0.5C discharge to the lithium ion battery volume V was the energy density ED in Wh. L-1。
The lithium ion batteries prepared in the above examples and comparative examples were charged at a 3C rate, discharged at a 1C rate, and subjected to a capacity retention rate test for 700 cycles, and the lithium ion batteries after 700 charging and discharging cycles were dissected to examine the swelling and crushing conditions of the negative active material in the negative electrode sheet.
The lithium ion batteries prepared in the above examples and comparative examples were charged at 5C rate, and the lithium ion batteries were dissected to examine lithium analysis after 20 weeks of cycles of 0.5C rate discharge.
Table 1 compositions and performance test results of lithium ion batteries of examples and comparative examples
As can be seen from Table 1, compared with the lithium ion batteries of comparative examples 1-3, the lithium ion battery prepared by the invention solves the problems of lithium separation, cycle capacity retention rate and energy density improvement of the lithium ion battery; compared with the lithium ion battery of comparative example 4, the energy density of the lithium ion battery is remarkably improved on the premise of ensuring no lithium precipitation.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A negative electrode sheet comprising a negative electrode current collector, a first negative electrode active material layer, and a second negative electrode active material layer; the first negative electrode active material layer is arranged on the first surface of the negative electrode current collector, and the second negative electrode active material layer is arranged on the surface of the first negative electrode active material layer;
the first negative active material layer includes a first negative active material selected from graphite, the second negative active material layer includes a second negative active material selected from SnS-MoS2。
2. The negative plate of claim 1, wherein the SnS-MoS2Is MoS covalently linked with SnS nano-dots2The nano-sheet is made into a hollow structure with interlayer covalent assembly.
3. The negative electrode sheet of claim 1 or 2, wherein the SnS-MoS2In the formula, the mass percentage of SnS is 20-50 wt%.
4. The negative electrode sheet according to any one of claims 1 to 3, wherein the median particle diameter Dv of the first negative electrode active material1 50Satisfies the following conditions: dv is less than or equal to 1 mu m1 50≤50μm；
And/or the median particle diameter Dv of the second negative electrode active material2 50Satisfies the following conditions: dv is not less than 100nm2 50≤600nm。
5. The negative electrode sheet according to claim 4, wherein the median particle diameter Dv of the first negative electrode active material1 50And a median particle diameter Dv of the second negative electrode active material2 50The ratio of (A) to (B) satisfies: dv is not less than 81 50/Dv2 50≤200。
6. The negative electrode sheet according to any one of claims 1 to 5, wherein the thickness L of the first negative electrode active material layer110 to 200 μm;
and/or the thickness L of the first anode active material layer1And a thickness L of the second anode active material layer2The ratio of (A) to (B) satisfies: l is more than or equal to 0.052/L1≤0.15。
7. The negative electrode sheet according to any one of claims 1 to 6, wherein the first negative electrode active material layer is further provided on a second surface of the negative electrode current collector opposite to the first surface, and the second negative electrode active material layer is provided on a surface of the first negative electrode active material layer.
8. The negative electrode sheet according to any one of claims 1 to 7, wherein the first negative electrode active material layer further comprises a first conductive agent and a first binder;
and/or the second anode active material layer further includes a second conductive agent and a second binder.
9. The negative electrode sheet according to any one of claims 1 to 8, wherein the first negative electrode active material layer comprises the following components in mass fraction: 90-99.2 wt% of a first negative electrode active material, 0.2-4 wt% of a first conductive agent, and 0.6-6 wt% of a first binder;
and/or the second anode active material layer comprises the following components in percentage by mass: 90-99.2 wt% of a second negative electrode active material, 0.2-4 wt% of a second conductive agent, and 0.6-6 wt% of a second binder.
10. A lithium ion battery comprising the negative electrode sheet of any one of claims 1 to 9.
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| CN104821240A (en) * | 2015-04-29 | 2015-08-05 | 岭南师范学院 | SnS2/MoS2 composite material one-step hydrothermal synthesizing method and application thereof |
| US20180287145A1 (en) * | 2016-07-04 | 2018-10-04 | Lg Chem, Ltd. | Negative electrode for secondary battery |
| CN108807878A (en) * | 2018-05-07 | 2018-11-13 | 同济大学 | A method of preparing molybdenum disulfide/vulcanization tin composite material of hollow structure |
| CN113410432A (en) * | 2020-05-08 | 2021-09-17 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method and lithium ion battery comprising negative plate |
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