Cream rolls-inspired advanced MnS/C composite for sodium-ion batteries: Encapsulating MnS creams into hollow N, S co-doped carbon rolls
With advantages of high theoretical capacity and low cost, manganese sulfide (MnS) becomes a potential electrode material for sodium-ion batteries (SIBs). However, complicated preparations and limited cycle life still hinder its application. Inspired by cream rolls in our daily life, MnS/N, S co-doped carbon tubes (MnS/NSCTs) composite with 3D cross-linked tubular structure is prepared via an ultra-simple and low cost method in this work. As anode for SIBs, the cream rolls-like MnS/NSCTs composite delivers the best electrochemical performance until now (the highest capacity of 550.6 mA h g-1 at 100 mA g-1, the highest capacity of 447.0 mA h g-1 after 1400 cycles at 1000 mA g-1, and the best rate performance of 319.8 mA h g-1 at 10000 mA g-1). Besides, According to several in-situ and ex-situ techniques, the sodium storage mechanism of MnS/NSCTs is mainly made of conversion reaction, and the superior electrochemical performance of MnS/NSCTs is mainly attributed to the unique cream rolls-like structure. More importantly, this simple method may be feasible for other anode materials, which will greatly promote the development of SIBs.