A positive electrode plate comprising a current collector , a positive active material layer and a safety coating disposed between the current collector and the positive active material layer , the safety coating comprising a polymer matrix, a conductive material and an inorganic filler, wherein the polymer matrix is fluorinated polyolefin and/or chlorinated polyolefin and a weight ratio of the polymer matrix to the conductive material is 2 or more; wherein the polymer matrix is fluorinated polyolefin and/or chlorinated polyolefin having a crosslinked structure by a crosslinking treatment, the crosslinking treatment is achieved by introducing an activator and a crosslinking agent, and the crosslinking agent is selected from at least one of polyisocyanates, polyamines, polyols, glycidyl ethers, inorganic substances, glyoxal, aziridine, ethylenically unsaturated compounds, organosilicons, benzenesulfonic acids, organic peroxides, and metal organic compounds; wherein the role of the activator is to remove HF or HCl from fluorinated polyolefin and/or chlorinated polyolefin to form a C = C double bond and the role of the crosslinking agent is to crosslink the C=C double bond; wherein the conductive material is selected from at least one of a conductive carbon-based material, a conductive metal material, and a conductive polymer material; and the inorganic filler is selected from at least one of metal oxides, non-metal oxides, metal carbides, non-metal carbides, and inorganic salts, all optionally modified with at least one of a conductive carbon coating, a conductive metal coating or a conductive polymer coating; and wherein in the safety coating , relative to the total weight of the inorganic filler, the polymer matrix and the conductive material, the weight percentage of the inorganic filler is 10 wt% to 60 wt%; and/or the weight percentage of the polymer matrix is 35 wt% to 75 wt%; and/or the weight percentage of the conductive material is from 5 wt% to 25 wt%. wherein the polymer matrix is fluorinated polyolefin and/or chlorinated polyolefin having a crosslinked structure by a crosslinking treatment, the crosslinking treatment is achieved by introducing an activator and a crosslinking agent, and the crosslinking agent is selected from at least one of polyisocyanates, polyamines, polyols, glycidyl ethers, inorganic substances, glyoxal, aziridine, ethylenically unsaturated compounds, organosilicons, benzenesulfonic acids, organic peroxides, and metal organic compounds; wherein the role of the activator is to remove HF or HCl from fluorinated polyolefin and/or chlorinated polyolefin to form a C = C double bond and the role of the crosslinking agent is to crosslink the C=C double bond; wherein the conductive material is selected from at least one of a conductive carbon-based material, a conductive metal material, and a conductive polymer material; and the inorganic filler is selected from at least one of metal oxides, non-metal oxides, metal carbides, non-metal carbides, and inorganic salts, all optionally modified with at least one of a conductive carbon coating, a conductive metal coating or a conductive polymer coating; and wherein in the safety coating , relative to the total weight of the inorganic filler, the polymer matrix and the conductive material, the weight percentage of the inorganic filler is 10 wt% to 60 wt%; and/or the weight percentage of the polymer matrix is 35 wt% to 75 wt%; and/or the weight percentage of the conductive material is from 5 wt% to 25 wt%. <EOS>