CN118299521A - Preparation method of silicon-based lithium ion negative plate for improving multiplying power performance of battery cell and lithium ion battery - Google Patents
Preparation method of silicon-based lithium ion negative plate for improving multiplying power performance of battery cell and lithium ion battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 42
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 36
- 239000010703 silicon Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 16
- 239000004917 carbon fiber Substances 0.000 claims abstract description 16
- 239000011267 electrode slurry Substances 0.000 claims abstract description 8
- 239000002109 single walled nanotube Substances 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000002134 carbon nanofiber Substances 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011889 copper foil Substances 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 239000007773 negative electrode material Substances 0.000 claims abstract description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 229910021389 graphene Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000002070 nanowire Substances 0.000 claims description 3
- 239000002620 silicon nanotube Substances 0.000 claims description 3
- 229910021430 silicon nanotube Inorganic materials 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- 150000001721 carbon Chemical class 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 239000004584 polyacrylic acid Substances 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000002210 silicon-based material Substances 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 238000009830 intercalation Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 230000002687 intercalation Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 3
- 239000002156 adsorbate Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910001437 manganese ion Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910001414 potassium ion Inorganic materials 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910005025 Li13Si4 Inorganic materials 0.000 description 1
- 229910011184 Li7Si3 Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000002409 silicon-based active material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to the technical field of lithium ion batteries, and discloses a preparation method of a silicon-based lithium ion negative plate for improving the multiplying power performance of a battery cell and a lithium ion battery. The preparation method of the silicon-based lithium ion negative electrode plate for improving the multiplying power performance of the battery cell comprises the following steps: (1) preparation of an adhesive: the weight ratio of the adhesive to the solvent is 1:2-98, and uniformly mixing to obtain a mixture A; (2) preparation of a negative electrode material: adding active Si, conductive carbon black, single-wall carbon nano tube and modified carbon fiber into the mixture A to prepare negative electrode slurry, coating the negative electrode slurry on the surface of a copper foil, drying and rolling to obtain a negative electrode plate. According to the silicon-based lithium ion negative electrode plate, the VGCF, the carbon fiber, the hollow carbon fiber and other long-range conductive materials with high electronic conductivity are introduced to participate in preparing the silicon-based lithium ion battery negative electrode, so that the long Cheng Daodian capacity inside the silicon-based lithium ion battery negative electrode plate is improved, and the problem of insufficient multiplying power performance caused by expansion of the silicon-based materials is solved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a silicon-based lithium ion negative plate for improving the multiplying power performance of a battery cell and a lithium ion battery.
Background
At present, most commercial lithium ion batteries adopt graphite cathodes, and although the lithium ion batteries adopting the graphite cathodes have the advantages of high coulombic efficiency, good cycle performance and the like, the theoretical capacity of the lithium ion batteries is very low, and the improvement of the specific capacity of the whole battery is limited. Silicon and lithium can form Li-Si alloys in various phase states such as Li 12Si7、Li7Si3、Li13Si4, li 22Si5 and the like; the voltage of lithium intercalation silicon is lower than 0.5V, and the co-intercalation of solvent molecules does not exist in the intercalation process, so that the lithium intercalation silicon is very suitable for being used as a cathode material of a lithium ion battery. However, the biggest problem of silicon-based materials is that there is a huge volume change in Li intercalation and deintercalation, which eventually leads to the destruction of the internal structure of the material, thereby causing serious morphological changes of the material, and further affecting the cycle performance of the electrode material. In addition, the conventional conductive agent SP and CNT are smaller in size (< 1 μm) and are usually attached to the surface of a single main material particle, so that the conductive connection effect between particles is small, electrons in the Si material negative electrode sheet are difficult to conduct between particles, and the rate capability of the battery core is insufficient.
The invention relates to a battery cathode and a preparation method thereof, and solves the problems that the internal structure of the material is damaged and the cycle performance of an electrode material is affected due to the huge volume change of the existing silicon-based material serving as the battery cathode in Li insertion and extraction. However, although this patent application solves some of the problems of huge volume change and cycle performance, there are also technical problems of insufficient contact between the polar material particles, insufficient rate capability of the battery cell, and the like.
Disclosure of Invention
The invention aims to overcome the defects of the background art, and provides a preparation method of a silicon-based lithium ion negative plate for improving the multiplying power performance of a battery core and a lithium ion battery, wherein the prepared negative plate can improve the capacity of a long Cheng Daodian inside the negative plate of the silicon-based lithium ion battery and solve the problem of the insufficient multiplying power performance caused by expansion of a silicon-based material.
In order to achieve the purpose of the invention, the preparation method of the silicon-based lithium ion negative plate for improving the multiplying power performance of the battery cell comprises the following steps:
(1) And (3) preparation of an adhesive: the weight ratio of the adhesive to the solvent is 1:2-98, and uniformly mixing to obtain a mixture A;
(2) Preparation of a negative electrode material: adding active Si, conductive carbon black, single-wall carbon nano tube and modified carbon fiber into the mixture A to prepare negative electrode slurry, coating the negative electrode slurry on the surface of a copper foil, drying and rolling to obtain a negative electrode plate.
Further, in some embodiments of the invention, the copper foil has a thickness of 5-50 μm.
Further, in some embodiments of the present invention, the mass ratio of the active Si, the conductive carbon black, the single-walled carbon nanotubes, the modified carbon fiber, and the binder is 86 to 96:0.8-2.2:0.8-2.2:0.8-8.5:1.5-11.5.
Further, in some embodiments of the present invention, the method for preparing the modified carbon fiber comprises the steps of:
(a) Mixing graphene and potassium permanganate solution: 0.8-1.2 parts by weight of graphene and potassium permanganate: 96-99, diluting the obtained mixture with deionized water until the mass ratio of the mixture is 0.9-1.1%, and obtaining a mixed solution for standby;
(b) Adding carbon fibers: adding carbon fibers into the mixed solution obtained in the step (a), uniformly stirring, placing in a hearth of a tube furnace, closing the sealing covers at the two ends, and vacuumizing;
the graphene reacts with the potassium permanganate, so that the oxidation degree of the graphite is enhanced, the structure becomes loose, the adsorption efficiency is improved, on the other hand, the potassium permanganate is used as an adsorbate, the molecular diameter of the potassium permanganate is 1.13nm and is smaller than the pore size of the activated carbon fiber, and the potassium permanganate is rolled into a fluffy column shape;
(c) High-temperature modification: heating the tube furnace to 175-185 ℃, then continuously heating to the target temperature of 555-565 ℃ within 85-95 minutes, slowly adding protective gas while heating, controlling the pressure between 0.03-0.035MPa, maintaining the pressure at 555-565 ℃ for 9-11 minutes, slowly cooling, and taking out the sample after cooling to 178-182 ℃ within 28-32 minutes without adding the protective gas.
Due to the modification, active manganese ions and potassium ions are generated, hydroxyl is added to the surface functional groups of the active carbon fibers, the chemical adsorptivity of the active carbon fibers is improved, and the electrochemical performance is improved due to the addition of graphene.
Further, in some embodiments of the present invention, the binder in step (1) is selected from one or more of sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, modified polyacrylic acid, polyvinylidene fluoride, and polyethylene oxide.
Further, in some embodiments of the present invention, the solvent in step (1) is deionized water.
Further, in some embodiments of the present invention, the active Si in step (2) is selected from one or more of silicon oxides, porous carbon deposited silicon, silicon nanowires, and silicon nanotubes.
Further, in some embodiments of the invention, the carbon fibers are VGCF (vapor grown carbon fibers) or hollow carbon fibers.
On the other hand, the invention also provides a silicon-based lithium ion negative electrode plate, which is prepared by adopting the preparation method for improving the multiplying power performance of the battery cell.
In still another aspect, the invention further provides a lithium ion battery for improving the multiplying power performance of an electric core, and the lithium ion battery comprises the silicon-based lithium ion negative plate.
Compared with the prior art, the invention has the following advantages:
(1) In the preparation of the modified carbon fiber, graphene reacts with potassium permanganate, so that the oxidation degree of graphite is enhanced, the structure becomes loose, the adsorption efficiency is improved, the potassium permanganate is used as an adsorbate, the molecular diameter of the potassium permanganate is 1.13nm and is smaller than the pore size of the activated carbon fiber, the potassium permanganate is rolled into a fluffy column shape, active manganese ions and potassium ions are generated, hydroxyl is added to the surface functional groups of the activated carbon fiber, the chemical adsorptivity of the activated carbon fiber is improved, and the electrochemical performance is improved due to the addition of the graphene.
(2) According to the silicon-based lithium ion negative electrode plate, the VGCF, the carbon fiber, the hollow carbon fiber and other long-range conductive materials with high electronic conductivity are introduced to participate in preparing the silicon-based lithium ion battery negative electrode, so that the long Cheng Daodian capacity inside the silicon-based lithium ion battery negative electrode plate is improved, and the problem of insufficient multiplying power performance caused by expansion of the silicon-based materials is solved.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is intended to be illustrative of the invention and not restrictive.
The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
The singular forms include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or event may or may not occur, and that the description includes both cases where the event occurs and cases where the event does not.
The indefinite articles "a" and "an" preceding an element or component of the invention are not limited to the requirement (i.e. the number of occurrences) of the element or component. Thus, the use of "a" or "an" should be interpreted as including one or at least one, and the singular reference of an element or component includes the plural reference unless the amount clearly dictates otherwise.
Furthermore, the descriptions of the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., described below mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. The technical features of the respective embodiments of the present invention may be combined with each other as long as they do not collide with each other.
The active Si is selected from one or more of silicon oxide, porous carbon deposited silicon, silicon nanowires and silicon nanotubes, and the performance of the negative electrode plate obtained by selecting the active Si has no obvious difference.
Example 1
Sequentially adding 0.1g of graphene and 9.9g of potassium permanganate into a beaker filled with 990g of deionized water, and stirring at a stirring speed of 500 revolutions per minute for 30 minutes to obtain a mixture of potassium permanganate and graphene; taking 10gVGCF g of the prepared mixture of potassium permanganate and graphene, uniformly stirring the mixture by using a glass rod, pouring the mixture into a ceramic boat, vacuumizing the ceramic boat to-0.09 MPa, heating to 180 ℃ firstly, then introducing nitrogen, keeping the pressure at 0.03-0.035 MPa, continuously heating the mixture for 90 minutes to 560 ℃, keeping the temperature for 10 minutes, then cooling the mixture for 30 minutes to 180 ℃, then closing the nitrogen, and taking out the sample to obtain the modified VGCF.
10G sodium carboxymethylcellulose (CMC) was added to a beaker containing 490g deionized water with stirring, and stirred at 800 rpm for 2 hours to give a clear, transparent solution having a solids content of 2%; adding active Si, conductive carbon black, single-walled carbon nanotubes and modified VGCF into the sodium carboxymethyl cellulose solution to prepare negative electrode slurry, wherein the weight ratio of the active Si to the conductive carbon black to the single-walled carbon nanotubes to the modified carbon fibers to the binder is 95:1:1:1:2; coating the negative electrode slurry on a copper foil with the thickness of 10 mu m, and drying and rolling to obtain a negative electrode plate; and matching the prepared positive plate with a negative electrode to prepare the lithium ion battery.
Examples 2 to 9 and comparative examples 1 to 3
The addition amounts of the silicon active material, the conductive carbon black, the binder, the single-walled carbon nanotube, the modified carbon fiber and the like are different, and the rest are the same.
Performance test method
Charging the battery to 4.2V at a constant current of 0.2C, and keeping the constant voltage to 0.05C; standing for 5 minutes; constant-current discharge of 0.2C to 2.5V, and 0.2C discharge capacity is obtained; standing for 30 minutes;
Constant current charging is carried out to 4.2V at 0.2C, and constant voltage is carried out to 0.05C; standing for 5 minutes; constant-current discharging of 1C to 2.5V to obtain 1C discharge capacity; standing for 30 minutes;
Constant current charging is carried out to 4.2V at 0.2C, and constant voltage is carried out to 0.05C; standing for 5 minutes; constant-current discharging of 2C to 2.5V to obtain 2C discharge capacity; standing for 30 minutes;
Constant current charging is carried out to 4.2V at 0.2C, and constant voltage is carried out to 0.05C; standing for 5 minutes; 3C constant current discharge to 2.5V, obtain 3C discharge capacity; standing for 30 minutes;
the 1C capacity retention ratio is the ratio of the capacity of 1C discharge to the 0.2C discharge capacity;
the 2C capacity retention ratio is the ratio of the capacity of 2C discharge to the 0.2C discharge capacity;
the 3C capacity retention rate is the ratio of the capacity of the 3C discharge to the 0.2C discharge capacity.
Table 1 material compositions and performance test results for each of the examples and comparative examples
The test results show that the addition of the modified carbon fiber obviously improves the rate discharge retention rate of the battery.
It will be readily appreciated by those skilled in the art that the foregoing is merely illustrative of the present invention and is not intended to limit the invention, but any modifications, equivalents, improvements or the like which fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The preparation method of the silicon-based lithium ion negative electrode plate for improving the multiplying power performance of the battery cell is characterized by comprising the following steps of:
(1) And (3) preparation of an adhesive: the weight ratio of the adhesive to the solvent is 1:2-98, and uniformly mixing to obtain a mixture A;
(2) Preparation of a negative electrode material: adding active Si, conductive carbon black, single-wall carbon nano tube and modified carbon fiber into the mixture A to prepare negative electrode slurry, coating the negative electrode slurry on the surface of a copper foil, drying and rolling to obtain a negative electrode plate.
2. The method for preparing the silicon-based lithium ion negative electrode sheet for improving the rate capability of a battery cell according to claim 1, wherein the method for preparing the modified carbon fiber comprises the following steps:
(a) Mixing graphene and potassium permanganate solution: 0.8-1.2 parts by weight of graphene and potassium permanganate: 96-99, diluting the obtained mixture with deionized water until the mass ratio of the mixture is 0.9-1.1%, and obtaining a mixed solution for standby;
(b) Adding carbon fibers: adding carbon fibers into the mixed solution obtained in the step (a), uniformly stirring, placing in a hearth of a tube furnace, closing the sealing covers at the two ends, and vacuumizing;
(c) High-temperature modification: heating the tube furnace to 175-185 ℃, then continuously heating to the target temperature of 555-565 ℃ within 85-95 minutes, slowly adding protective gas while heating, controlling the pressure between 0.03-0.035MPa, maintaining the pressure at 555-565 ℃ for 9-11 minutes, slowly cooling, and taking out the sample after cooling to 178-182 ℃ within 28-32 minutes without adding the protective gas.
3. The method for preparing the silicon-based lithium ion negative electrode sheet for improving the rate performance of a battery cell according to claim 1, wherein the thickness of the copper foil is 5-50 μm.
4. The preparation method of the silicon-based lithium ion negative electrode sheet for improving the rate performance of the battery cell according to claim 1, wherein the mass ratio of active Si, conductive carbon black, single-walled carbon nano-tubes, modified carbon fibers and binders is 86-96:0.8-2.2:0.8-2.2:0.8-8.5:1.5-11.5.
5. The method for preparing a silicon-based lithium ion negative electrode sheet for improving the rate capability of a battery cell according to claim 1, wherein the solvent in the step (1) is deionized water.
6. The method for preparing the silicon-based lithium ion negative electrode sheet for improving the rate capability of the battery cell according to claim 1, wherein the adhesive in the step (1) is one or more selected from sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, modified polyacrylic acid, polyvinylidene fluoride and polyethylene oxide.
7. The method for preparing a silicon-based lithium ion negative electrode sheet for improving the rate capability of a battery cell according to claim 1, wherein the active Si in the step (2) is one or more selected from the group consisting of silicon oxide, porous carbon deposited silicon, silicon nanowires and silicon nanotubes.
8. The method for preparing the silicon-based lithium ion negative electrode sheet for improving the rate capability of a battery cell according to claim 1, wherein the carbon fiber is VGCF or hollow carbon fiber.
9. A silicon-based lithium ion negative electrode sheet, characterized in that the silicon-based lithium ion negative electrode sheet is prepared by the preparation method of any one of claims 1-8.
10. A lithium ion battery capable of improving the rate capability of an electric core, which is characterized by comprising the silicon-based lithium ion negative electrode plate of claim 8.
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