LAUSR

Carbon-coated LiMnBO3/C is synthesized by a sol-gel method using polyethylene glycol 6000 (PEG-6000) as carbon source. The influences of different sintering temperatures on the crystal structure, morphology, and electrochemical performance of LiMnBO3/C composites are investigated. XRD results indicate that the samples consist of the monoclinic phase LiMnBO3 (m-LiMnBO3) and the hexagonal phase LiMnBO3 (h-LiMnBO3), and the amount of m-LiMnBO3 is reduced and the h-LiMnBO3 is increased with the increasing sintering temperature. The particle size of the samples is about 500 nm, and the surface of the particles is coated with a thick amorphous carbon layer. The LiMnBO3/C synthesized at 750 °C exhibits the initial discharge capacities of 213.4, 170.8, and 109.7 mAh g−1 at 0.025, 0.05, and 0.5 C rates, respectively, and shows better cycling performance than that of bare LiMnBO3. The enhanced electrochemical performance might be largely attributed to the uniformly coated carbon layers from decomposition of the PEG-6000.