As revealed in Fig. 9, for SnO2 anodes, using carbon shell coating coupled with the adding Cu particles to form homogeneous composites of pomegranate-structured SnO2@C/Cu, and further to prevent the agglomeration of active materials and the capacity fading in cycling process, is promising for high-performance LIBs especially at low temperature. Moreover, the LIBs in practical application were usually carried out under direct-current mode. As presented in Fig. 9c, according to scattering theory of electron transport across the interface, the total resistance of SnO2@C/Cu in batteries is determined by the resistance of Cu particles, which is much smaller than the carbon shell in the composites of SnO2@C. Thus, the improvement of conductivity in electrode can result in a low interface polarization, which is considered to be responsible for the enhancement of the electrochemical performance.