Lithium-sulfur battery additive, positive electrode material containing the additive and preparation method thereof
A technology of positive electrode materials and additives, which is applied in the field of lithium-sulfur battery additives, positive electrode materials containing the additives and its preparation, and can solve the problem of reducing sulfur utilization rate, specific capacity and cycle performance, increasing electrolyte viscosity and ion migration resistance, etc. problems, achieve the effects of reducing adverse effects, inhibiting dissolution, and improving cycle performance
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Embodiment 1
[0034] In this embodiment, the additive is purified DNA, and the added amount of DNA is relatively high. The physical adsorption method is used to load DNA in the carbon material, specifically: 4g activated carbon (C) is added to a high concentration (2.67 mg·mL) -1 ) In the DNA solution, add ultrapure water (UP) to 30 mL of C / DNA, heat and evaporate to dryness in an oil bath at 80°C to obtain the C / DNA complex. The composite method of C / DNA and S is the same as in the comparative example. The final C / S / DNA composite cathode material contains C: 58wt%, S: 40.00 wt%, DNA: 2.00 wt%, and the preparation and assembly of the positive pole piece The battery and battery test methods are the same as in the comparative example. The battery charge and discharge test results show that the first charge and discharge specific capacity of the battery is: 992 mAh·g -1 . Specific capacity after 50 cycles: 746mAh·g -1 ,The specific capacity after 100 cycles is: 711 mAh·g -1 . Compared with th...
Embodiment 2
[0036] In this example, the additive is purified DNA, and the amount of DNA added is medium, and the content of DNA is 0.27 mg·mL -1 . The physical adsorption method is used to load DNA in the carbon material, and the specific method is the same as in Example 1. The composite method of C / DNA and S is the same as that in the comparative example. The final C / S / DNA composite cathode material contains C: 59.80 wt%, S: 40.00 wt%, and DNA: 0.20 wt%. The battery assembly and battery test methods are the same as in the comparative example. The constant current charge and discharge test of the battery shows that the first discharge specific capacity is: 1117 mAh·g -1 . Specific capacity after 50 cycles: 785 mAh·g -1 ,The specific capacity after 100 cycles is 761 mAh·g -1 . See the result figure 2 Shown. Compared with the battery without additives, the specific discharge capacity and cycle stability of the battery after the addition of DNA additives are greatly improved, and the elec...
Embodiment 3
[0038] In this example, the additive is purified DNA, and the amount of DNA added is clarified. The content of DNA is 0.027 mg·mL -1 . The physical adsorption method is used to load DNA in the carbon material, and the specific method is the same as in Example 1. The composite method of C / DNA and S is the same as that in the comparative example. In the final C / S / DNA composite cathode material, C: 59.90 wt%, S: 40.00 wt%, DNA: 0.1 wt%, and the preparation of positive pole pieces, The battery assembly and battery test methods are the same as in the comparative example. The constant current charge and discharge test of the battery shows that the first discharge specific capacity is: 1002 mAh·g -1 . Specific capacity after 50 cycles: 738 mAh·g -1 ,The specific capacity after 100 cycles is: 719 mAh·g -1 . Compared with the battery without additives, the specific discharge capacity and cycle stability of the battery after the addition of DNA additives are greatly improved, and the e...
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Abstract
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