构建CEI膜提升氯化镍正极热电池放电性能OA北大核心CSTPCD

A electrochemical interface(CEI)thin film between the cathode and the separator was con-structed by using carbon materials to avoid the direct contact between the cathode and separator ma-terials.The elements on the surface of the separator material after discharge were characterized and analyzed by using energy dispersive spectroscopy(EDS).The results show that the electrical perfor-mance of the cell with multi walled carbon nanotubes constructed CEI film improves significantly at a low current density of 100 mA/cm2.Compared to 1#batteries without CEI film,the discharge ca-pacity of 3#batteries with CEI-1 powder effectively increases by more than 40%.With a cut-off volt-age of 2.0 V for the cell,the discharge time is 824 s,the discharge specific capacity reaches 994 A·s/g,and the utilization rate of the cathode material reaches 89%.The effective capacity of the cathode material is fully utilized.Therefore,using multi walled carbon nanotube materials to construct CEI thin films between the cathode and separator can effectively prevent the mutual melting of the cath-ode and separator materials,and avoid the short circuit in the later stage of the battery.