Quinone compounds are among the most promising candidate organic materials for energy storage due to advantages such as their higher theoretical energy density. In the present paper, a one-step condensation method is described for connecting anthraquinone units via thioether bonds to generate a poly (anthraquinone sulfide) (PAQS) material as a promising lithium energy-storage system. Poly(anthraquinone sulfide)/carbon nanotube (PAQS/CNT) frameworks are then prepared via an insitu chemical solution method. The good electrochemical performance of the PAQS/CNT composite with 2 wt % carbon nanotubes is then demonstrated, with a significantly higher discharge specific capacity (187.2 mA h g À 1 ) than that of a pure PAQS electrode (101.0 mA h g À 1 ). Moreover, the specific capacity remains at 168.4 mA h g À 1 after 200 cycles, with a retention rate of 90.0 %. It is confirmed that CNTs play a number of roles in the composite polymer material, such as stabilizing the material structure during battery charging and discharging, improving the electronic conductivity, and alleviating the dissolution of the components of the organic electrolyte.
Materials with NASICON structure, such as NaTi2(PO4)3 (NTP), are widely studied in the field of sodium ion battery. They have potential applications, but their conductivity is poor. Nanostructure can shorten the ion and electron transport paths and make
electrolytes permeable easily. Generally speaking, the electric conductivity of battery materials can be improved by adding appropriate amount of carbon. In this paper, large-scale NTP/C nanomaterial of kilogram level was prepared by spray drying. The as-prepared NTP/C nanomaterial shows good
electrochemical performance. At 5 C, the initial specific capacity is 69 mA h g–1, and the capacity after 2000 cycles is about 73.2% of the initial capacity.
The commercialization of sulfur batteries is hindered by a few inherent drawbacks. In this study, crumpled N-doped graphene anchored with cobalt (Co-NCG) was fabricated in one pot via a sample solvothermal method and applied to lithium-sulfur (LiÀ S) batteries. The crumpled structure not only gives graphene a large specific surface area and abundant pores, but also endows graphene superb stability by preventing its restacking; these features are beneficial for loading and efficient utilization of sulfur. The lone pair electrons on the nitrogen atom underwent strong chemical interactions with Li ions, which lent the Co-NCG/S material the ability to chemically immobilize polysulfide species. Cobalt acts as an electrocatalyst in the battery and kinetically accelerates sulfur redox reactions. As a result of these multifunctional arrangements, the Co-NCG/ S cathode showed excellent capacity retention and reaction kinetics and high sulfur loading capacity.
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