A novel rose-with-thorn ternary MoS 2 @carbon@polyaniline nanocomposite as a rechargeable magnesium battery cathode displaying stable capacity and low-temperature performance.

Developing high-performance cathode materials for magnesium (Mg) batteries is of great significance. Here, a novel rose-with-thorn ternary MoS 2 @C@polyaniline (PANI) nanocomposite composed of carbon and PANI nanoneedles co-coated on rose-like MoS 2 is developed. The conductive PANI needles on the surface of MoS 2 improve the conductivity, and the inner MoS 2 is wrapped by a carbon layer which is beneficial for the aniline coating. The MoS 2 @C@PANI-based Mg battery cathode displays a good capacity of 114 mA h g -1 after 100 cycles, and a recoverable rate-performance after repeated measurements. In addition, a stable capacity of 105 mA h g -1 when cycled at a low temperature of -5 °C is also achieved, indicating good potential for applications.