Figure 2.

(a) Schematic diagram of carbon coating [44]. Reproduced with permission from Electrochimica Acta; published by Elsevier, 2011; (b) TEM image of LiFePO₄/C with bridge network and graphene nanofiber as the insert [48]. Reproduced with permission from Electrochimica Acta; published by Elsevier, 2016; (c) HRTEM image of MnO₂-coated LVP/C cathode, and (d) schematic illustration of its structure and diffusion path [50]. Reproduced with permission from Journal of Materials Science; published by Springer, 2017; (e) cycling performance of LiFePO₄/C with different contents of coating at 1 C and −20 °C, where G−0, G−3, and G−7 represent the composites with 0 wt.%, 3 wt.%, and 7 wt.% graphene nanofibers, respectively [48]. Reproduced with permission from Electrochimica Acta; published by Elsevier, 2016; (f) first charge and discharge curves of M−3 and M−0 at −20 °C [50]. Reproduced with permission from Journal of Materials Science; published by Springer, 2017.