CN114773555B - Pre-lithiation modified Schiff base polymer electrode material and preparation method thereof - Google Patents
Pre-lithiation modified Schiff base polymer electrode material and preparation method thereof Download PDFInfo
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- 239000002262 Schiff base Substances 0.000 title claims abstract description 73
- 150000004753 Schiff bases Chemical class 0.000 title claims abstract description 73
- 229920005601 base polymer Polymers 0.000 title claims abstract description 73
- 239000007772 electrode material Substances 0.000 title claims abstract description 24
- 238000006138 lithiation reaction Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 13
- 239000007773 negative electrode material Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 20
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 14
- FEHLIYXNTWAEBQ-UHFFFAOYSA-N 4-(4-formylphenyl)benzaldehyde Chemical compound C1=CC(C=O)=CC=C1C1=CC=C(C=O)C=C1 FEHLIYXNTWAEBQ-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 12
- 229920000877 Melamine resin Polymers 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 229910000103 lithium hydride Inorganic materials 0.000 claims description 9
- 239000007795 chemical reaction product Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 230000007935 neutral effect Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 150000004678 hydrides Chemical class 0.000 abstract description 2
- 238000002715 modification method Methods 0.000 abstract description 2
- 150000001450 anions Chemical class 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 description 11
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000010405 anode material Substances 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- SIAPCJWMELPYOE-UHFFFAOYSA-N lithium hydride Chemical compound [LiH] SIAPCJWMELPYOE-UHFFFAOYSA-N 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with substituted triazines
- C08G12/32—Melamines
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
-
- 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
- H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
- H01M4/602—Polymers
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Secondary Cells (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a pre-lithiation modified Schiff base polymer electrode material and a preparation method thereof, wherein the Schiff base polymer is modified by a chemical pre-lithiation method, active-NH-bonds in the Schiff base polymer are treated by using a reducing hydride LiH, so that-NH-sites are deprotonated, a neutral framework is changed into an anion framework, and a stable-N is used ‑ Li + Sites to modify the product, which can be used as negative electrode material in lithium ion batteries. The modification method disclosed by the invention is simple in process, environment-friendly, low in cost and easy for mass production, and the cycle performance of the organic electrode material is improved.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a modification method and application of an organic electrode material.
Background
Organic electronic materials have the potential to be sustainable and low carbon, mostly found widely in nature, or can be produced from natural products by using a process that is more environmentally friendly, thereby reducing the impact on the environment. However, the biggest disadvantage is the dissolution problem, namely that dissolution occurs to different extents in the aprotic electrolyte, severely affecting the cycle performance.
Furthermore, due to the formation of Solid Electrolyte Interfaces (SEI), an initial irreversible capacity loss is unavoidable, which generally results in excessive consumption of lithium ions, and a method to overcome this problem is prelithiation. Generally, in the lithium ion intercalation process, when the negative electrode potential is less than about 1V, the organic electrolyte undergoes side reactions at the anode surface to be reduced to form SEI. Although the SEI plays a key role in preventing the intercalation of ions into the electrode body in the electrolyte, a small portion of the lithium ions can become irreversibly immobilized in the electrode, resulting in additional consumption of lithium ions and abrupt changes in electrolyte concentration. Prelithiation is considered as an effective approach to solve the above problems, and has a positive effect on the cycle life of lithium ion batteries by constructing, regulating and optimizing SEI. Through pre-lithiation, the problem of high capacity irreversibility of the lithium ion battery can be effectively solved, and the circulation stability is improved.
The current pre-lithiation technology of the anode material mainly includes three kinds: the negative electrode is directly prelithiated by adding prelithiation agents such as stabilized lithium metal powder and lithium alloy compounds to the negative electrode; electrochemical prelithiation methods, based on the electrochemical reaction of an anode with lithium metal in the presence of an electrolyte, are similar to the anodic lithiation process in batteries; the invention adopts a chemical pre-lithiation method, utilizes a lithiation reagent with strong reducing power, transfers active lithium to the anode material through oxidation-reduction reaction, has simple and practical preparation process and better pre-lithiation effect.
Disclosure of Invention
Based on the problems existing in the prior art, the invention provides a pre-lithiation modified Schiff base polymer electrode material and a preparation method thereof, and aims to obtain a lithium ion battery anode material with excellent cycle performance.
The invention adopts the following technical scheme to solve the technical problems:
the preparation method of the pre-lithiated modified Schiff base polymer electrode material is characterized by comprising the following steps of: the preparation method comprises the steps of taking melamine and 4,4' -biphenyl dicarboxaldehyde as raw materials and dimethyl sulfoxide as a solvent, obtaining a Schiff base polymer through reflux reaction, and then carrying out heating and stirring reaction on the Schiff base polymer and lithium hydride, thereby obtaining the pre-lithiated modified Schiff base polymer electrode material. The method specifically comprises the following steps:
step 1, adding melamine and 4,4 '-biphenyl dicarboxaldehyde into dimethyl sulfoxide, and performing ultrasonic treatment until the melamine and the 4,4' -biphenyl dicarboxaldehyde are dissolved to obtain a mixed solution;
step 2, adding the mixed solution into a reflux device for reflux reaction, and performing suction filtration on an obtained reaction product to obtain a Schiff base polymer;
and step 3, heating and stirring the Schiff base polymer and lithium hydride for reaction, so as to obtain the pre-lithiation modified Schiff base polymer electrode material.
Further, the molar ratio of the melamine to the 4,4' -biphenyl dicarboxaldehyde is 1:0.75-1.5.
Further, the reflux reaction and the heating and stirring reaction are both carried out under the protection of nitrogen. .
Further, the temperature of the reflux reaction is 160-180 ℃ and the time is 12-24 hours.
Further, the washing reagent used in the suction filtration is ethanol and dichloromethane which are washed sequentially.
Further, the molar ratio of the Schiff base polymer to the lithium hydride is 1:2-5.
Further, the temperature of the heating and stirring reaction is 80-100 ℃ and the time is 8-12 h.
The pre-lithiated modified Schiff base polymer electrode material prepared by the preparation method can be used as a lithium ion battery negative electrode material. The preparation method of the pre-lithiation modified Schiff base polymer comprises the steps of modifying the Schiff base polymer by a chemical pre-lithiation method, treating active-NH-bond in the Schiff base polymer by using a reducing hydride LiH to deprotonate an-NH-site, changing a neutral framework into an anionic framework, and stabilizing the neutral framework by using stable-N - Li + Sites to modify the product, which can be used as negative electrode material in lithium ion batteries.
Compared with the prior art, the invention has the beneficial effects that:
1. the preparation method disclosed by the invention is simple in process, environment-friendly and low in cost, is suitable for large-scale production, and the modified Schiff base polymer prepared by the preparation method is excellent in electrochemical performance, so that the cycle performance of the organic electrode material when the organic electrode material is used as a negative electrode material of a lithium ion battery is greatly improved.
2. The results of the electrochemical test show that: the cyclic performance test is carried out under the same current density, the cyclic performance of the pre-lithiated modified Schiff base polymer is greatly improved, and the original Schiff base polymer starts to decay rapidly after being circulated for hundreds of circles. The electrode supplements extra lithium ions for the solid electrolyte interface in the first cycle process after the pre-lithiation, reduces the consumption of lithium salt in the electrolyte, eliminates the influence of a part of irreversible capacity, and in the long-term cycle, the pre-lithiated material and the electrolyte have larger polarity difference, thereby being beneficial to inhibiting the dissolution of the material and the electrolyte.
Drawings
FIG. 1 is a diagram of the synthetic steps of the Schiff base polymer and modified Schiff base polymer of the present invention;
FIG. 2 is a graph showing the IR spectrum of the Schiff base polymer before and after modification in example 1 of the present invention;
FIG. 3 is a structural unit formula of the modified Schiff base polymer obtained in the invention;
FIG. 4 is a scanning electron microscope image of the modified Schiff base polymer of example 1 of the present invention;
FIG. 5 is a graph of the rate capability of the modified Schiff base polymer of example 1 of the present invention;
FIG. 6 is a graph comparing cycle performance at a current density of 1A/g before and after modification of the Schiff base polymer in example 1 of the present invention;
FIG. 7 is a cyclic voltammogram of a modified Schiff base polymer at a sweep rate of 2mV/s in example 2 of the present invention;
FIG. 8 is a graph of the rate capability of the modified Schiff base polymer of example 2 of the present invention;
FIG. 9 is a graph comparing cycle performance at a current density of 0.5A/g before and after modification of the Schiff base polymer in example 2 of the present invention.
Detailed Description
The technical scheme of the present invention is described in detail below by specific examples, which are implemented on the premise of the technical scheme of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
And (3) weighing melamine and 4,4 '-biphenyl dicarboxaldehyde according to a molar ratio of 1:0.75, adding the melamine and the 4,4' -biphenyl dicarboxaldehyde into a beaker filled with dimethyl sulfoxide, performing ultrasonic treatment for 1 hour to form a transparent solution, transferring the solution into a three-neck flask of a reflux device, introducing nitrogen for protection, and performing heating reflux at 160 ℃ for 12 hours to obtain a reaction product. After the reaction product is cooled to room temperature, washing with excessive ethanol and dichloromethane alternately until the filtrate is clear and colorless, and drying the filter cake in a blast drying oven to obtain the Schiff base polymer.
And weighing Schiff base polymer and lithium hydride according to a molar ratio of 1:2, heating and stirring for reaction for 8 hours at 80 ℃ under the protection of nitrogen, filtering the product sequentially by ethanol and dichloromethane after the reaction is finished, washing the product by ethanol until the filtrate is neutral, and drying to obtain the modified Schiff base polymer.
FIG. 1 is a diagram showing the steps of synthesis of the Schiff base polymer and the modified Schiff base polymer in example 1 of the present invention, and FIG. 2 is a diagram showing the IR spectrum comparison of the Schiff base polymer before and after modification at 1600cm -1 ～1400cm -1 And 810cm -1 The nearby peaks are characteristic signals of triazine ring and benzene ring structures respectively, and prove that the embodiment successfully prepares the Schiff base polymer, and the chemical structure of the Schiff base polymer is not destroyed after modification, and the chemical formula of the structural unit is shown in figure 3.
Fig. 4 is a scanning electron microscope image of the schiff base polymer obtained in this example, in which it can be seen that the modified schiff base polymer is a block formed by aggregation of particles.
The Schiff base polymer and the modified Schiff base polymer prepared in the embodiment are respectively and uniformly mixed with conductive carbon black and polyvinylidene fluoride according to the mass ratio of 5:4:1, and a proper amount of N-methyl pyrrolidone is added to prepare slurry. And uniformly coating the slurry on a copper foil by using a 200 mu m scraper, and vacuum drying at 80 ℃ for 12 hours to obtain the Schiff base polymer pole piece.
Stamping the manufactured Schiff base polymer pole piece into a wafer with the diameter of 12 mm; taking a metal lithium sheet with the diameter of 16mm as a positive electrode and Celgard2400 as a diaphragm; dissolving electrolyte lithium hexafluorophosphate in a mixed solution of dimethyl carbonate and ethylene carbonate in a volume ratio of 1:1 to prepare an electrolyte with a concentration of 1 mol/L; assembled into a button cell in an argon filled glove box. The button cell was tested at 0.01-3V charge-discharge voltage using a NEWARE-CT-4008T battery test system and a CHI660E electrochemical workstation.
FIG. 5 is a graph showing the rate performance of the assembled button cell of the modified Schiff base polymer in this example, after cycling at a plurality of different current densities of 0.1A/g, 0.3A/g, 0.5A/g, 1A/g, 3A/g, 5A/g, the capacity can still be recovered to 299.6mAh/g, indicating that the material has excellent cycling stability and rate performance.
FIG. 6 is a graph showing the cycle performance of the assembled button cell of the modified Schiff base polymer electrode material of this example at a current density of 1A/g. After 1000 circles of circulation, only 266mAh/g specific capacity of the Schiff base polymer is remained, and the modified Schiff base polymer reaches 588mAh/g, so that the circulation performance of the electrode material after the pre-lithiation modification is successfully proved to be greatly improved.
Example 2
And weighing melamine and 4,4 '-biphenyl dicarboxaldehyde according to a molar ratio of 1:1.5, adding the melamine and the 4,4' -biphenyl dicarboxaldehyde into a beaker filled with dimethyl sulfoxide, performing ultrasonic treatment for 1 hour to form a transparent solution, transferring the solution into a three-neck flask of a reflux device, introducing nitrogen for protection, and performing heating reflux for 24 hours at 180 ℃ to obtain a reaction product. After the reaction product is cooled to room temperature, washing with excessive ethanol and dichloromethane alternately until the filtrate is clear and colorless, and drying the filter cake in a blast drying oven to obtain the Schiff base polymer.
And weighing Schiff base polymer and lithium hydride according to a molar ratio of 1:5, heating and stirring for reaction for 12 hours at 100 ℃ under the protection of nitrogen, filtering the product sequentially by ethanol and dichloromethane after the reaction is finished, washing the product by ethanol until the filtrate is neutral, and drying to obtain the modified Schiff base polymer.
The modified Schiff base polymer prepared in the embodiment is uniformly mixed with conductive carbon black and polyvinylidene fluoride according to the mass ratio of 5:4:1, and a proper amount of N-methyl pyrrolidone is added to prepare slurry. And uniformly coating the slurry on a copper foil by using a 200 mu m scraper, and vacuum drying at 80 ℃ for 12 hours to obtain the Schiff base polymer pole piece.
Stamping the manufactured Schiff base polymer pole piece into a wafer with the diameter of 12 mm; taking a metal lithium sheet with the diameter of 16mm as a positive electrode and Celgard2400 as a diaphragm; dissolving electrolyte lithium hexafluorophosphate in a mixed solution of dimethyl carbonate and ethylene carbonate in a volume ratio of 1:1 to prepare an electrolyte with a concentration of 1 mol/L; assembled into a button cell in an argon filled glove box. The button cell was tested at 0.01-3V charge-discharge voltage using a NEWARE-CT-4008T battery test system and a CHI660E electrochemical workstation.
Fig. 7 is a cyclic voltammogram of a button cell assembled from the modified schiff base polymer electrode material of this example, and it can be observed that CV curves almost overlap after the second turn, indicating that the oxidation-reduction reaction occurring on the schiff base polymer has high stability and reversibility.
FIG. 8 is a graph showing the rate performance of the modified Schiff base polymer electrode material button cell in this example, after the modified Schiff base polymer electrode material button cell is cycled at a plurality of different current densities of 0.1A/g, 0.3A/g, 0.5A/g, 1A/g, 3A/g and 5A/g, the capacity of the modified Schiff base polymer electrode material button cell can still be recovered to 305.4mAh/g, which indicates that the material is excellent in cycling stability and rate performance.
Fig. 9 is a graph showing the cycle performance of the assembled button cell of the modified front and rear schiff base polymer electrode materials of this example at a current density of 0.5A/g. The Schiff base polymer had a capacity of up to about 600mAh/g after 400 cycles, and then began to drop continuously, leaving only 446mAh/g after the subsequent 100 cycles. The specific capacity of the modified Schiff base polymer is up to 571mAh/g at 500 circles, which strongly proves that the cycle performance of the pre-lithiation modification is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A preparation method of a pre-lithiated modified Schiff base polymer electrode material is characterized by comprising the following steps: taking melamine and 4,4' -biphenyl dicarboxaldehyde as raw materials and dimethyl sulfoxide as a solvent, obtaining a Schiff base polymer through reflux reaction, and then carrying out heating and stirring reaction on the Schiff base polymer and lithium hydride to obtain a pre-lithiation modified Schiff base polymer electrode material; the molar ratio of the Schiff base polymer to the lithium hydride is 1:2-5.
2. The method of manufacturing according to claim 1, comprising the steps of:
step 1, adding melamine and 4,4 '-biphenyl dicarboxaldehyde into dimethyl sulfoxide, and performing ultrasonic treatment until the melamine and the 4,4' -biphenyl dicarboxaldehyde are dissolved to obtain a mixed solution;
step 2, adding the mixed solution into a reflux device for reflux reaction, and performing suction filtration on an obtained reaction product to obtain a Schiff base polymer;
and step 3, heating and stirring the Schiff base polymer and lithium hydride for reaction, so as to obtain the pre-lithiation modified Schiff base polymer electrode material.
3. The preparation method according to claim 1 or 2, characterized in that: the molar ratio of the melamine to the 4,4' -biphenyl dicarboxaldehyde is 1:0.75-1.5.
4. The preparation method according to claim 1 or 2, characterized in that: both the reflux reaction and the heating and stirring reaction are carried out under the protection of nitrogen.
5. The preparation method according to claim 1 or 2, characterized in that: the temperature of the reflux reaction is 160-180 ℃ and the time is 12-24 hours.
6. The preparation method according to claim 2, characterized in that: the washing reagent used in the suction filtration is ethanol and dichloromethane.
7. The preparation method according to claim 1 or 2, characterized in that: the temperature of the heating and stirring reaction is 80-100 ℃ and the time is 8-12 h.
8. A prelithiated modified schiff base polymer electrode material prepared by the preparation method of any one of claims 1-7.
9. Use of the prelithiation modified schiff base polymer electrode material according to claim 8 in a negative electrode material of a lithium ion battery.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200019105A (en) * | 2018-08-13 | 2020-02-21 | 주식회사 엘지화학 | Modified conjugated diene polymer and preparation method thereof |
| CN112510186A (en) * | 2020-12-03 | 2021-03-16 | 珠海冠宇电池股份有限公司 | Pre-lithiated silicon negative electrode material, silicon negative electrode piece, preparation method of silicon negative electrode piece and lithium battery |
| CN112940156A (en) * | 2021-01-25 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Pre-lithiation polymer and preparation method and application thereof |
| CN113248672A (en) * | 2021-06-25 | 2021-08-13 | 安徽大学 | Schiff base polymer electrode material with increased capacity in circulation process and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200019105A (en) * | 2018-08-13 | 2020-02-21 | 주식회사 엘지화학 | Modified conjugated diene polymer and preparation method thereof |
| CN112510186A (en) * | 2020-12-03 | 2021-03-16 | 珠海冠宇电池股份有限公司 | Pre-lithiated silicon negative electrode material, silicon negative electrode piece, preparation method of silicon negative electrode piece and lithium battery |
| CN112940156A (en) * | 2021-01-25 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Pre-lithiation polymer and preparation method and application thereof |
| CN113248672A (en) * | 2021-06-25 | 2021-08-13 | 安徽大学 | Schiff base polymer electrode material with increased capacity in circulation process and preparation method thereof |
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