Organic positive electrode material, preparation method and application of organic positive electrode material in alkali metal ion battery
A technology of alkali metal ions and positive electrode materials, which is applied in the fields of organic positive electrode materials, applications and preparation of alkali metal ion batteries, can solve the problems such as the energy density, rate performance and cycle stability of sodium/potassium ion full batteries need to be further improved. , to achieve the effect of excellent battery performance
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Embodiment 1
[0052] This embodiment provides an organic positive electrode material, the organic positive electrode material is named 2PTCDA, and the structural formula is as follows:
[0053]
[0054] The preparation method of the organic cathode material 2PTCDA is as follows:
[0055] Step 1: Perylenetetracarboxylic dianhydride PTCDA (1.00 g, 2.55 mmol), 1-hexanol (0.61 g, 6 mmol) and 1-bromohexane (1.24 g, 7.5 mmol) were added to a 250 mL Schlenk flask. Then 40 mL of N,N-dimethylformamide (DMF) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU; 1.52 g, 10 mmol) were added to the mixture. The mixture was stirred at 80°C for 3 days and then cooled to room temperature. The reaction solution was poured into a mixed solvent (absolute ethanol:water=1:20), stirred and left to stand for 5 hours. After filtration, the solid was redissolved in dichloromethane (DCM) and purified on a silica gel column using petroleum ether (PE) as eluent. After removing the solvent under vacuum, the crude product ...
Embodiment 2
[0061] This embodiment provides a positive electrode sheet, a 2PTCDA electrode sheet, and the specific preparation method is as follows:
[0062] First, mix the 2PTCDA (65wt%), conductive carbon additive (25wt%) and binder (10wt%) prepared in Example 1; then evenly coat it on the aluminum foil; the loading mass of 2PTCDA on the electrode sheet is greater than 2mg cm -2 . Press into circular aluminum electrode sheet; apply this electrode sheet to alkali metal ion half-cell and full-cell; test its redox potential, actual specific capacity, cycle stability and rate performance. The subsequent performance of alkali metal ion batteries proves that 2PTCDA is a new type of organic small molecule cathode material with high capacity, high rate performance, high voltage and high stability in alkali metal ion batteries.
Embodiment 3
[0064] About the performance test of 2PTCDA in lithium-ion batteries
[0065] This example provides a half-cell: using the 2PTCDA electrode sheet prepared in Example 2 as the positive electrode, metal lithium as the negative electrode, and 6M LiTFSI+DME / DOL as the electrolyte.
[0066] The performance test results are as image 3 shown. Specifically as image 3 middle:
[0067] From Figure (a), it can be seen that the redox voltage of 2PTCDA is 2.35V (vs. Li + / Li), the peak specific capacity can reach 142mAh g -1 .
[0068] It can be seen from Figure (b) that at 62.5mA g -1 After 200 cycles at the current density of (0.5C), the capacity retention rate was 83% (124~102mAh g -1 );
[0069] It can be seen from Figure (d) that at high current (1000mA g -1 ) cycle, it can still maintain 66% specific capacity (110~73mAh g) after 3000 cycles -1 ).
[0070] It can be seen from Figure (c) that 2PTCDA also has excellent rate performance in lithium-ion batteries: at 100 / 200 / 5...
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