Haomiao Li

A high performance sulfur-doped disordered carbon anode for sodium ion batteries

Sulfur-doped disordered carbon is facilely synthesized and investigated as an anode for sodium ion batteries. Benefiting from the high sulfur doping (∼26.9 wt%), it demonstrates a high reversible capacity of 516 mA h g−1, excellent rate capability as well as superior cycling stability (271 mA h g−1 at 1 A g−1 after 1000 cycles).

Layered SnS2 cross-linked by carbon nanotubes as a high performance anode for sodium ion batteries

A SnS2@CNT nanocomposite as a high performance sodium-ion battery anode material is prepared via a facile sintering route. Benefiting from the high conductivity and strong mechanical properties of the CNTs, the SnS2@CNT with a unique nanostructure of 2D SnS2 sheets cross-linked by 1D CNTs, delivers a high reversible capacity of 758 mA h g−1 at 100 mA g−1 and an excellent cyclability with a capacity retention of 87% over 300 cycles. More impressively, over 445 mA h g−1 can be obtained at a high current density of 5 A g−1, demonstrating a superior rate capability.

Molten salt electrochemical synthesis of sodium titanates as high performance anode materials for sodium ion batteries

Sodium ion batteries are attractive alternatives to lithium ion batteries for stationary energy storage technology, and titanates are considered as promising anode materials for sodium ion batteries. Herein, a series of sodium titanates were synthesized via a simple, fast and controllable electrochemical route from solid TiO2 in molten salts of NaF–NaCl–NaI. For the first time, the as-prepared Na0.23TiO2 and Na0.46TiO2 were utilized as anode materials for sodium ion batteries, with a sodium storage capacity of 185 mA h g−1 and 215 mA h g−1 after 200 cycles, respectively. High rate and long term tests indicated the excellent cycle performance due to the formation of a 3D porous electrode structure during the long term charge/discharge processes.

Controllable Electrochemical Synthesis of Copper Sulfides as Sodium-Ion Battery Anodes with Superior Rate Capability and Ultralong Cycle Life

Sodium-ion batteries (SIBs) are prospective alternative to lithium-ion batteries for large-scale energy-storage applications, owing to the abundant resources of sodium. Metal sulfides are deemed to be promising anode materials for SIBs due to their low-cost and eco-friendliness. Herein, for the first time, series of copper sulfides (Cu2S, Cu7S4, and Cu7KS4) are controllably synthesized via a facile electrochemical route in KCl-NaCl-Na2S molten salts. The as-prepared Cu2S with micron-sized flakes structure is first investigated as anode of SIBs, which delivers a capacity of 430 mAh g-1 with a high initial Coulombic efficiency of 84.9% at a current density of 100 mA g-1. Moreover, the Cu2S anode demonstrates superior capability (337 mAh g-1 at 20 A g-1, corresponding to 50 C) and ultralong cycle performance (88.2% of capacity retention after 5000 cycles at 5 A g-1, corresponding to 0.0024% of fade rate per cycle). Meanwhile, the pseudocapacitance contribution and robust porous structure in situ formed during cycling endow the Cu2S anodes with outstanding rate capability and enhanced cyclic performance, which are revealed by kinetics analysis and ex situ characterization.