Manufacturing method of lithium ion hybrid capacitor
By mixing and assembling the positive electrode and negative electrode materials in a lithium-ion battery in a specific proportion, the problem that the prior art is difficult to take into account high energy density and high power density is solved, and the high energy density and high power density of lithium-ion hybrid capacitors are achieved. Take into account both.
Patent Information
- Application Number
- CN202410694348.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-10
AI Technical Summary
Existing lithium-ion batteries and supercapacitors each have high energy density and high power density, but it is difficult to take into account both. How to design energy storage devices that take into account both high energy density and high power density is a difficult problem.
By mixing the materials of the positive electrode and the negative electrode in a specific proportion, adding components such as binder and conductive agent to make a slurry, coating, drying, cutting into a wafer, assembled into a lithium-ion mixing capacitor, using activated carbon of a specific proportion and Conductive agent to improve capacitor performance.
On the basis of maintaining the high energy density of lithium-ion batteries, its power density and rate performance are improved.
Abstract
Description
Technical Field
[0001] The present invention relates to the field of lithium ion hybrid capacitors, and in particular to a method for manufacturing a lithium ion hybrid capacitor. Background Art
[0002] Supercapacitors and lithium-ion batteries are two energy storage devices with different mechanisms. Supercapacitors have the advantage of high power density, but low energy density; while lithium-ion batteries have the advantage of high energy density but low power density. How to develop energy storage devices with both high energy density and high power density is a difficult problem; how to design a device that combines the energy storage mechanisms of the two and develop lithium-ion hybrid capacitors is a hot topic of research. Summary of the invention
[0003] The present invention provides a method for manufacturing a lithium ion hybrid capacitor. The specific technical solution is as follows: 1. A method for making a lithium-ion hybrid capacitor, characterized in that it includes the following steps: S1, mixing ternary positive electrode NCM 622 and activated carbon in different proportions of the positive electrode, and sequentially adding a binder, a conductive agent, and a positive electrode active material to make a positive electrode slurry; then coating, drying, cutting into discs, and drying to obtain a positive electrode sheet. S2, sequentially adding a binder. A conductive agent, and a negative electrode active material to make a negative electrode slurry; then coating, drying, cutting into discs, and drying to obtain a negative electrode sheet. S3, using the positive electrode sheet obtained in S1, the negative electrode sheet obtained in S2, a PP separator, and a ternary electrolyte to assemble a lithium-ion hybrid capacitor. 2. Preferably, the content of activated carbon is 5%~20wt%. 3. Preferably, the conductive agent is SP:GN=1:1. 4. Preferably, the ratio of active material, conductive agent, and binder is 8:1:1. 5. Preferably, the pre-lithiation time is 30min. The beneficial effects obtained by the present invention are as follows: while maintaining the high energy density of the lithium-ion battery, the power density and rate performance thereof are further improved.
[0004] Example 1: 1.6g pure NCM 622, 0.2g PVDF, 0.1g SP, and 0.1g GN were dispersed in 7.5mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and re-drying; 1.6g hard carbon, 0.2g PVDF, 0.1g SP, and 0.1g GN were dispersed in 7.5mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and re-drying; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
[0005] Example 2: 1.44 g NCM 622 and 0.16 g activated carbon were fully mixed, and then dispersed together with 0.2 g PVDF, 0.1 g SP, and 0.1 g GN in 7.5 mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and drying again; 1.6 g hard carbon, 0.2 g PVDF, 0.1 g SP, and 0.1 g GN were dispersed in 7.5 mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and drying again; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
[0006] Example 3: 1.28 g NCM 622 and 0.32 g activated carbon were fully mixed, and then dispersed together with 0.2 g PVDF, 0.1 g SP, and 0.1 g GN in 7.5 mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and drying again; 1.6 g hard carbon, 0.2 g PVDF, 0.1 g SP, and 0.1 g GN were dispersed in 7.5 mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and drying again; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
[0007] Example 4: 1.12 g NCM 622 and 0.48 g activated carbon were fully mixed, and then dispersed together with 0.2 g PVDF, 0.1 g SP, and 0.1 g GN in 7.5 mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and drying again; 1.6 g hard carbon, 0.2 g PVDF, 0.1 g SP, and 0.1 g GN were dispersed in 7.5 mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and drying again; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
[0008] Example 5: 0.96 g NCM 622 and 0.64 g activated carbon were fully mixed, and then dispersed together with 0.2 g PVDF, 0.1 g SP, and 0.1 g GN in 7.5 mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and drying again; 1.6 g hard carbon, 0.2 g PVDF, 0.1 g SP, and 0.1 g GN were dispersed in 7.5 mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and drying again; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
[0009] Example 6: 0.8 g NCM 622 and 0.8 g activated carbon were fully mixed, and then dispersed together with 0.2 g PVDF, 0.1 g SP, and 0.1 g GN in 7.5 mL NMP solution, and the positive electrode sheet was obtained by coating, drying, cutting, and drying again; 1.6 g hard carbon, 0.2 g PVDF, 0.1 g SP, and 0.1 g GN were dispersed in 7.5 mL NMP solution, and the negative electrode sheet was obtained by coating, drying, cutting, and drying again; the obtained negative electrode sheet was pre-lithiated for 30 minutes, and a lithium-ion hybrid capacitor was assembled.
Claims
1. A method for manufacturing a lithium-ion hybrid capacitor, characterized in that: The following steps are involved: S1. Mixing ternary positive electrode NCM 622 and activated carbon in different proportions of positive electrode, adding binder, conductive agent and positive electrode active material in sequence to prepare positive electrode slurry; then coating, drying, cutting into discs and drying again to obtain positive electrode sheets; S2, add binder, conductive agent and negative electrode active material in sequence to make negative electrode slurry; then apply, dry, cut into discs and dry again to obtain negative electrode sheets; S3. Use the positive electrode sheet obtained in S1, the negative electrode sheet obtained in S2, the PP separator and the ternary electrolyte to assemble a lithium-ion hybrid capacitor.
2. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The content of activated carbon is 0%~50wt%, preferably 5%~20wt%.
3. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The conductive agent used is one or more of SP, KB, GN, CNT, and KS-6.
4. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The binder used was PVDF and the solvent was NMP.
5. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The negative electrode active material is one or more of hard carbon, soft carbon, graphite, and mesophase carbon microspheres.
6. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The diameter of the positive electrode piece is 12 μm.
7. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The diameter of the negative electrode piece is 16 μm.
8. The method for manufacturing a lithium ion hybrid capacitor according to claim 1, characterized in that: The negative electrode needs to be pre-lithiated. Drop a drop of electrolyte on the lithium sheet, then stick the negative electrode sheet on the lithium sheet and pre-lithiate for 10-60 minutes.