Facile Preparation of MoS<sub>2</sub> Nanocomposites for Efficient Potassium‐Ion Batteries by Grinding‐Promoted Intercalation Exfoliation
Honglei Wang, Honglei Wang, Jiazheng Niu, Jun Shi, Wenzhen Lv, Hongguang Wang, Hongguang Wang, Peter A. van Aken, Zhonghua Zhang, Runfeng Chen, Wei Huang
Abstract
Abstract Efficient exfoliations of bulk molybdenum disulfide (MoS 2 ) into few‐layered nanosheets in pure phase are highly attractive because of the promising applications of the resulted 2D materials in diversified optoelectronic devices. Here, a new exfoliation method is presented to prepare semiconductive 2D hexagonal phase (2 H phase) MoS 2 –cellulose nanocrystal (CNC) nanocomposites using grinding‐promoted intercalation exfoliation (GPIE). This method with facile grinding of the bulk MoS 2 and CNC powder followed by conventional liquid‐phase exfoliation in water can not only efficiently exfoliate 2 H ‐MoS 2 nanosheets, but also produce the 2 H ‐MoS 2 /CNC 2D nanocomposites simultaneously. Interestingly, the intercalated CNC sandwiched in MoS 2 nanosheets increases the interlayer spacing of 2 H ‐MoS 2 , providing perfect conditions to accommodate the large‐sized ions. Therefore, these nanocomposites are good anode materials of potassium‐ion batteries (KIBs), showing a high reversible capacity of 203 mAh g −1 at 200 mA g −1 after 300 cycles, a good reversible capacity of 114 mAh g −1 at 500 mA g −1 , and a low decay of 0.02% per cycle over 1500 cycles. With these impressive KIB performances, this efficient GPIE method will open up a new avenue to prepare pure‐phase MoS 2 and promising 2D nanocomposites for high‐performance device applications.