DIAPHRAGM AND HIGH-VOLTAGE BATTERY COMPRISING SAME

A diaphragm and a high-voltage battery including the diaphragm. A modification layer is coated on a surface of an inorganic ceramic particle, the modification layer can adsorb transition metal ions precipitated from an electrode material, thereby preventing the transition metal ions from forming transition metal precipitates on a surface of a negative electrode and improving safety, rate performance and cycle performance of the battery. At the same time, since the modification layer is coated on the surface of the inorganic ceramic particle, thus it will not have a significant impact on an internal resistance of the battery, and thereby not reducing the rate, low temperature, and cycle performances of the battery. Moreover, an introduction of the modification material can realize adsorption of trace HF produced in a battery system, which, on one hand, can inhibit dissolution of the transition metal ions, stabilize a surface structure of a positive electrode and improve the performance of the battery; on the other hand, can reduce a corrosion of HF on a battery cover material and improve the safety performance of the battery.