To meet the demands of long cycle life under high rate for lithium-ion batteries, the advancement of anode materials with stable structural properties is necessarily demanded. Such promotion needs to design reasonable structure to facilitate the transportation of electron and lithium ions (Li). Herein, a novel C/FeO sea-sponge-like structure was synthesized by ultrasonic spray pyrolysis following thermal decomposition process. On the basis of sea-sponge carbon (SSC) excellences in electronic conductivity and short Li diffusion pathway, nano-FeO anchored on stable SSC skeleton can deliver high electrochemical performance with long cycle life under high rate. During electrochemical cycling, well-dispersed nano-FeO in ∼6 nm not only averts excessive pulverization and is enveloped by solid electrolyte interphase film, but also increases Li diffusion efficiency. The much improved electrochemical properties showed a capacity of around 460 mAh g at a high rate of 1.5C with a retention rate of 93%, which is maintained without degradation up to 1000 cycles (1C = 1000 mA g).
Development of highly stabile battery-type electrode materials with superior capacity has been a critical challenge for hybrid supercapacitors. We report a high-performance electrode material, tubular sandwich-structured CNT@Ni@Ni 2 (CO 3 )(OH) 2 , synthesized via a scalable, dynamic, controlled in situ reduction− chemical deposition process. Applied as a battery-type electrode material, this novel nanostructure exhibits excellent electrochemical stability, majorly attributed to the Ni midshell serving a dual role as "capacity supplement" and "electron highway", which, to our knowledge, was incorporated into the nanocomposite electrodes for the first time. Also benefiting from the high conductivity of carbon nanotubes (CNTs) and the high capacity of the amorphous NiOOH ultrathin film [converted from the Ni 2 (CO 3 )(OH) 2 outer shell], the resulting CNT@Ni@Ni 2 (CO 3 )(OH) 2 material as a battery-type electrode achieves a superior capacity of 221 mAh•g −1 at 5 A•g −1 with 76% capacity retention at 50 A•g −1 and maintains 81% capacity after 9000 cycles at 5 A•g −1 . An advanced aqueous hybrid supercapacitor using activated carbon and CNT@Ni@Ni 2 (CO 3 )(OH) 2 nanocomposite as the negative and positive electrodes, respectively, delivers a high energy density of 179 Wh•kg −1 at a power density of 2880 W•kg −1 with capacitance retention in excess of 85% over 5500 cycles. The outstanding performance demonstrates its practical potential in advanced hybrid supercapacitors.
For the purpose of stable performance in energy storage systems, a new hollow nanostructure of seasponge-C/SiC@SiC/C (SCS/SiC@SiC/C) has been successfully fabricated by the SCS/SiC nanospheres coated with SiC/C shells through an in situ reduction process. Based on SCSs and the carbon shells, the stable hollow structures of SCS/SiC@SiC/C can contain large proportion of active SiC layers, which are adhered to both SCSs and the inner surfaces of carbon shells. Such nanostructured anode enables an excellent cycling stability with a capacity of 612 mAh/g at a current density of 0.5 A/g after 1,800 cycles, achieving an excellent stable Li + -storage capability.
A novel clustered MnO2–S@NCG micro-nanostructure was successfully constructed, and exhibits superior electrochemical activity and cycling stability, promising as candidate to high-performance Li–S batteries.
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