CN115632129A - High-capacity lithium ion battery Al negative electrode and preparation method thereof - Google Patents
High-capacity lithium ion battery Al negative electrode and preparation method thereof Download PDFInfo
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- CN115632129A CN115632129A CN202211254785.6A CN202211254785A CN115632129A CN 115632129 A CN115632129 A CN 115632129A CN 202211254785 A CN202211254785 A CN 202211254785A CN 115632129 A CN115632129 A CN 115632129A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000011888 foil Substances 0.000 claims abstract description 38
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002033 PVDF binder Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000006230 acetylene black Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007773 negative electrode material Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 239000010406 cathode material Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052744 lithium Inorganic materials 0.000 abstract description 13
- 238000003860 storage Methods 0.000 abstract description 9
- 230000009257 reactivity Effects 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 14
- 239000003792 electrolyte Substances 0.000 description 13
- 210000004027 cell Anatomy 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000010408 film Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- 238000010301 surface-oxidation reaction Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910010199 LiAl Inorganic materials 0.000 description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- -1 aluminum metals Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/46—Alloys based on magnesium or aluminium
- H01M4/463—Aluminium based
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a preparation method of an Al negative electrode material of a lithium ion battery. The method comprises the following specific steps: weighing NiF according to proportion 2 Acetylene black, polyvinylidene fluoride (PVDF, dissolved in N-methylpyrrolidone, concentration 0.02 g mL) ‑1 ) The above materials were mixed in an agate mortar to a uniform slurry. The aluminum foil was fixed on a coater equipped with a vacuum pump, and after the slurry was uniformly coated on the aluminum foil with a glass rod, 4 to 6h was baked with a baking lamp to evaporate N-methylpyrrolidone. Cutting the aluminum foil into round pieces of 14 mm size by a slicer, treating under a pressure of 6-8Mpa by the slicer, and finally drying 10h in a vacuum oven at 120 ℃ to obtain the load NiF 2 The aluminum electrode of (1). The Al cathode prepared by the invention has high reactivity and high lithium storage capacity, the preparation method is simple, and lithium ions are carried outThe method has important application value in the sub-battery.
Description
Technical Field
The invention relates to a preparation method of a novel lithium ion battery cathode material, in particular to a design of a novel high-capacity electrode based on aluminum foil, belonging to the field of electrochemical energy.
Background
As one of the energy storage devices, the lithium ion battery has the advantages of high specific energy, long cycle life, low self-discharge, no memory and the like. Determination of lithiumThe key to ion battery performance is the electrode material. Currently, the negative electrode material of the lithium ion battery is mainly a carbon material. Its theoretical capacity is low (372 mAh g) -1 ) And its lower discharge plateau may cause lithium dendrites to form on the electrode surface during discharge, piercing the separator and causing a safety hazard. The development of a novel cathode material with higher capacity and a safer discharge platform has important significance for the research and development of high-performance lithium ion batteries.
Aluminum is the most abundant metal element in the crust of the earth, and the current yield is ranked second among various types of metals. The related industrial technology of the aluminum metal is relatively mature and develops rapidly. Currently, aluminum metals and alloys are widely used in various fields such as home decoration, home appliances, vehicles, ships, aerospace, and the like. Meanwhile, aluminum can also be used as a lithium ion battery cathode material theoretically. Aluminum can form an alloy (LiAl, li) with lithium during discharge 3 Al 2 And Li 9 Al 4 ) The potential is 0.23 to 0.38V. The discharge potential is higher than the lithium insertion potential of graphite, and lithium dendrite formation in the discharge process can be effectively avoided. Meanwhile, the alloying reaction ensures that Al as the lithium ion battery can realize ultrahigh theoretical capacity (for example, the theoretical capacity of the formed LiAl is 993 mAh g -1 ) Far higher than graphite carbon cathode material. The advantages make Al an ideal cathode material, and have great research and application values. However, the current research reports on the Al negative electrode are less, and the main reason is that the Al activity is higher, a passivation film is easily formed on the surface, and the Li in the electrolyte is blocked + Reacts with active Al. The surface oxidation process of Al is related to its size, and as the particle size decreases, surface oxidation occurs more easily. Most of traditional Al negative electrodes are small-particle powder materials, the activity of the traditional Al negative electrodes is greatly reduced due to serious surface oxidation, and the capacity of the traditional Al negative electrodes is not more than 400 mAh g -1 This is disadvantageous for its practical use.
Based on the above background, the present patent aims to develop a novel Al anode material with high capacity. Aiming at the problem that the surface of Al powder particles is easy to oxidize and lose reactivity, the Al powder particles adopt an Al thin film structure, and the surface is inhibited by utilizing high crystallinity and small specific surface area of Al in the thin filmPassivation, mitigating the resulting decrease in activity. Meanwhile, an F-containing auxiliary layer with an etching function on the Al film is introduced to the surface of the electrode, so that the reaction of the electrolyte and the Al matrix electrode is promoted, and the synergistic effect is generated with the Al active matrix, and finally the Al cathode material with excellent performance is obtained. The Al cathode material prepared by the method has high capacity (1000 mAh g) -1 Left and right), showing important application value.
Disclosure of Invention
A novel preparation method of an Al cathode of a lithium ion battery comprises the step of coating NiF with certain etching effect on an oxide layer on the surface of an Al foil with oxidized surface 2 The wettability of the Al foil and the electrolyte is enhanced, the Al foil and the Al generate a synergistic effect, and the lithium storage activity of the Al cathode is obviously improved. The method comprises the following specific steps:
mixing NiF 2 ·4H 2 Dissolving O, acetylene black and PVDF in N-methylpyrrolidone, mixing the materials into uniform slurry in an agate mortar, coating the slurry on aluminum foil, baking the aluminum foil to form a coating, pressing the coating, and drying the coating in vacuum to obtain the Al cathode material of the lithium ion battery.
The NiF 2 ·4H 2 The mass ratio of O to acetylene black to PVDF is 8:0.5-2:0.5-2.
The NiF 2 ·4H 2 The total mass concentration of O, acetylene black and PVDF dissolved in N-methyl pyrrolidone is 0.12-0.36 g/mL.
The coating amount of the slurry is 0.2-0.4 mg/cm 2 The thickness of the aluminum foil is 20 mm.
The storage condition of the aluminum foil is that a thin oxide layer with the purity of 99.9 percent exists on the surface of the aluminum foil in the air environment at normal temperature.
The temperature in the baking process is 40-60 ℃, and the baking time is 4-6h.
And pressing the aluminum foil snips coated with the coating for 2-5s at 6-8 MPa. When the pressure is too low, the material will fall off from the surface of the aluminum foil, and when the pressure is too high, the aluminum foil will adhere to the press and will not fall off.
The vacuum drying condition is that the drying is carried out for 7 to 10 hours under the pressure of minus 1 to 0.1MPa and at the temperature of 100 to 120 ℃.
Because Al has high reaction activityAnd an oxide film is generated on the surface of the Al-based material when the Al-based material is stored in the air, so that the contact and reaction of the electrolyte and Al are hindered, and the Al-based material has poor reactivity and low lithium storage capacity. The patent is specially aimed at the Al material, preferably film Al material, and NiF with etching effect on alumina is coated on the surface 2 The contact and reaction of the electrolyte and Al are promoted, and the electrolyte and Al generate synergistic effect in the charging and discharging processes, so that the capacity of the Al cathode is remarkably improved.
The Al negative electrode and the preparation method thereof have the following obvious advantages:
high lithium storage capacity, low lithium storage potential and safety. The lithium storage capacity of the Al negative electrode is 1000 mAh g when the total mass of the Al foil and the coating material is considered -1 Left and right. The charging platform and the discharging platform are respectively positioned near 0.25V and 0.38V, and the method has important application value. The Al cathode takes the ready-made Al foil as a raw material, has low cost and wide source and is beneficial to the practical application; the preparation method of the Al cathode is simple, the Al raw material does not need to be additionally processed, and the repeatability is good.
Drawings
FIG. 1. Example 1 electrolytic solution was dropped onto a wafer.
FIG. 2 shows the first charge/discharge curve (a) and the cycle performance diagram (b) of example 1.
FIG. 3. Electrode sheet pulverization after the cycle of example 1.
FIG. 4 XRD of the powder obtained by powdering the electrode sheet after the cycle of example 1.
Figure 5. Example 2 the electrolyte was dropped onto the wafer.
Fig. 6 half cell test slump for example 2.
FIG. 7. Example 3 an electrolyte was dropped onto a wafer before dropping (a) and after dropping (b).
FIG. 8 shows the first charge/discharge curve (a) and the cycle performance diagram (b) of example 3.
FIG. 9 shows the first charge/discharge curve (a) and the cycle performance diagram (b) of example 4.
FIG. 10 shows the first charge/discharge curve (a) and the cycle performance diagram (b) of example 5.
FIG. 11 shows the first charge/discharge curve (a) and the cycle performance diagram (b) of example 6.
Detailed Description
Example 1
Taking NiF 2 ·4H 2 O: acetylene black: PVDF (polyvinylidene fluoride) mass ratio of 8 2 ·4H 2 The total mass concentration of the mixed material formed by O, acetylene black and PVDF is 0.3 g mL -1 The materials are evenly mixed in an agate mortar to form slurry. In addition, the aluminum foil is placed on a coating machine, and the coating machine has the function of flatly paving the aluminum foil on a plane; the principle is that air below the aluminum foil is pumped by a vacuum pump, the upper part of the aluminum foil is still exposed to the air, so that a pressure difference is formed up and down to enable the aluminum foil to be flatly pressed on a coating machine, then a flat glass rod is used for uniformly coating slurry on the aluminum foil, and the coating amount of the slurry is 0.3 mg/cm 2 After coating, 4-6h was baked with a baking lamp to evaporate the binder solvent N-methylpyrrolidone. And cutting the aluminum foil into electrode slices with the size of 14 mm by a slicer, flattening the electrode slices under the pressure of 6-8Mpa so that the edge is flat and burr-free, and finally drying the electrode slices in a vacuum drying box at the temperature of 120 ℃ for 10h to obtain the Al cathode material of the lithium ion battery.
Assembling a half cell, taking a metal lithium sheet with the diameter of 14 mm as a counter electrode, taking a Celgard 2400 polypropylene microporous membrane as a diaphragm material, and taking an electrolyte as a solution dissolved in EC: DMC: liPF of DEC (volume ratio 1 6 And (3) solution. The assembly was carried out in a glove box filled with argon (volume fractions of water and oxygen are less than one part per million) and the cell model was 2025. As shown in fig. 1, the electrode sheet has a good wetting effect with the electrolyte. The assembled cell was sealed using a sealer at 50 Mpa pressure, followed by resting 8-10 h. The charge and discharge test is performed on Land CT2001, the test voltage interval is 3-0.01V, and the current density is 0.02A g -1 . As shown in FIG. 2, the electrode has obvious discharging and charging platforms near 0.25 and 0.38V, and the first discharging capacity is 1169 mAh g -1 The charge capacity is 972 mAh g -1 The initial coulombic efficiency was 83.21%. The charging and discharging curve and the capacity correspond to the Al cathode, which shows that the prepared electrodeThe medium Al has lithium storage activity. At the same time, the cycled cell was disassembled and it was found that the Al electrode had reacted completely to form a uniform powdered electrode (optical picture shown in fig. 3). XRD testing of the powder in the fully charged state showed that the major components of the powder corresponded to those of standard card PDF #01-1180 for Al (FIG. 4).
Example 2
A half cell was assembled as described in example 1 directly using an Al foil with a diameter of 14 mm as the counter electrode. As shown in fig. 5, the Al foil did not sufficiently wet with the electrolyte. During the test, the cell was protected from a sudden drop in voltage and failed to show lithium storage activity (fig. 6).
Example 3
Only 0.2 g mL of Al foil is dripped -1 Was dissolved in NMP, electrode sheets were prepared and assembled into batteries as described in example 1. As shown in fig. 7, the electrode was coated to better wet with the electrolyte. At 0.01A g -1 Electrochemical tests were carried out and the cell showed a similar charge-discharge curve as example 1, but a lower overall capacity (fig. 8). The main reasons are as follows: 1) The PVDF shrinks after being coated on the aluminum foil, so that the uniformity of bonding with the Al foil is poor; 2) PVDF has no activity and cannot well generate a synergistic effect with Al foil in circulation.
Example 4
The Al powder was mixed with acetylene black and PVDF in a ratio of 8. At 0.2A g -1 The first charge and discharge curve and the cycle performance of the current density charge and discharge of (2) are shown in fig. 9, a platform of lithium aluminum alloy can appear, but the capacity is lower. The first charge and discharge capacity is 144.2 mAh g -1 、82.8 mAh g -1 The first effect is 57.37 percent, and the first effect is maintained at 40 mAh g after 3 times of circulation -1 Left and right.
Example 5
Al powder and NiF are weighed in equal amount 2 ·4H 2 O (mass of Al powder and NiF) mixed thoroughly 2 ·4H 2 O mass 10u foil and prepared into electrode sheets as described in example 1 and assembled into batteries. At 0.2A g -1 The first charge and discharge curve and the cycle performance of the current density charge and discharge of (1) are shown in figure 10, and the current density charge and discharge has a platform of lithium-aluminum alloy. The first charging and discharging capacity is 151.3 mAh g -1 、270.1 mAh g -1 The first effect is 56.01%, and the first effect is maintained at 100 mA h g after 3 times of circulation -1 Left and right.
Example 6
NiF in the slurry 2 ·4H 2 The ratio of O to acetylene black, PVDF, was raised to 20, 1, and the slurry was coated on aluminum foil as in example 1, and the assembled cell showed a similar charge and discharge curve as in example 1, but the capacity fade was faster for the first three cycles (fig. 11). The main reason for this is the excess of NiF 2 ·4H 2 The corrosion degree of O to the aluminum foil is increased, so that more aluminum in the aluminum foil is exposed, the reaction of the aluminum foil and the electrolyte is too violent, and the irreversible reaction degree is higher.
Claims (7)
1. The preparation method of the Al cathode material of the lithium ion battery is characterized in that NiF is added 2 ·4H 2 Dissolving O, acetylene black and PVDF in N-methylpyrrolidone, mixing the materials into uniform slurry in an agate mortar, coating the slurry on aluminum foil, baking the aluminum foil to form a coating, pressing the coating, and drying the coating in vacuum to obtain the Al cathode material of the lithium ion battery.
2. The preparation method of the Al negative electrode material of the lithium ion battery as claimed in claim 1, wherein NiF 2 ·4H 2 The mass ratio of O to acetylene black to PVDF is 8:0.5-2:0.5-2.
3. The preparation method of the Al negative electrode material of the lithium ion battery as claimed in claim 2, wherein NiF 2 ·4H 2 The total mass concentration of O, acetylene black and PVDF dissolved in N-methyl pyrrolidone is 0.12-0.36 g/mL.
4. The lithium ion battery of claim 3The preparation method of the Al negative electrode material is characterized in that the coating amount of the slurry is 0.2 to 0.4 mg/cm 2 。
5. The preparation method of the Al negative electrode material of the lithium ion battery, according to claim 4, is characterized in that the baking process is carried out at the temperature of 40-60 ℃ for 4-6h.
6. The method for preparing the Al negative electrode material of the lithium ion battery according to claim 5, wherein the aluminum foil cut sheet coated with the coating is pressed for 2-5s under the pressure of 6-8 Mpa.
7. The preparation method of the Al negative electrode material of the lithium ion battery as claimed in claim 5, wherein the drying is carried out under the vacuum drying condition of-1 to 0.1MPa at the temperature of 100 to 120 ℃ for 7 to 10 hours.
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| WO2024084937A1 (en) * | 2022-10-20 | 2024-04-25 | 住友化学株式会社 | Negative electrode for lithium secondary batteries, negative electrode precursor for lithium secondary batteries, lithium secondary battery, and method for producing negative electrode for lithium secondary batteries |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050263A (en) * | 2021-11-09 | 2022-02-15 | 远景动力技术(江苏)有限公司 | Negative electrode material and preparation method and application thereof |
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| CN114050263A (en) * | 2021-11-09 | 2022-02-15 | 远景动力技术(江苏)有限公司 | Negative electrode material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| YONGFA HUANG ET AL.: "Tetragonal MF2 (M=Ni, Co) micro/nanocrystals anodes for lithium/ sodium-ion capacitors", 《ELECTROCHIMICA ACTA》, vol. 329, 24 October 2019 (2019-10-24), pages 2, XP085919393, DOI: 10.1016/j.electacta.2019.135138 * |
Cited By (1)
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| WO2024084937A1 (en) * | 2022-10-20 | 2024-04-25 | 住友化学株式会社 | Negative electrode for lithium secondary batteries, negative electrode precursor for lithium secondary batteries, lithium secondary battery, and method for producing negative electrode for lithium secondary batteries |
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