Abstract: A polycrystalline cobalt-nickel-manganese ternary positive material is provided. The polycrystalline cobalt-nickel-manganese ternary positive material comprises more than two basic crystalline structures of Liz—CoO2, LizNiO2, LizMnO2, LizCo1-(x+y)NixMnyO2, LizNixMn1-xO2, LizCoxNi1-xO2 and Li2MnO3. Further, a method for preparing the positive material by high-temperature fusion is provided. The positive material has the compacted density of 3.9-4.3 g/cm3, the capacity of 145 mAh/g or more when the discharging rate is 0.5-1C and the capacity retention rate of more than 90% after 300 cycles. The positive material prepared by high-temperature fusion has high volume energy density, excellent electrochemical performance, and improved safety and is manufactured economically. Further, a lithium ion secondary battery comprising the positive material is provided.

Abstract: Provided are a high manganese polycrystalline anode material, preparation method thereof and dynamic lithium ion battery. The general formula of the high manganese polycrystalline anode material is LiwMnx(CoNi)yOz, wherein x=0.4-2.0, y=0.1-0.6, x+y<2, z?2, and w?1. The weight of Mn is not less than 40% of the weight of LiwMnx(CoNi)yOz, and the particle size thereof is 7-20 microns. The high manganese polycrystalline anode material has more than two lattice structures selected from LiMn2O4, LiCOn(NiMn)1-nO2, LiNi0.8Co0.2O2, LiCoO2, LiNinMn1-nO2, LiMn2nNi2(1-n)O4 and LiNiO2, which are in mixed state or intergrowth state, wherein n<1. The specific energy of the anode material is more than 155 Wh/K, the conservation rate of the capacity is not less than 80% after 500 charging and discharging circles when the charging and discharging multiplying dynamic is 1C and at 55° C., and at 25° C., its cycle life is not less than 1000 times and the conservation rate of the capacity is more than 80%.

Abstract: A polycrystalline cobalt-nickel-manganese ternary positive material is provided. The polycrystalline cobalt-nickel-manganese ternary positive material comprises more than two basic crystalline structures of Liz—CoO2, LizNiO2, LizMnO2, LizCo1-(x+y)NixMnyO2, LizNixMn1-xO2, LizCoxNi1-xO2 and Li2MnO3. Further, a method for preparing the positive material by high-temperature fusion is provided. The positive material has the compacted density of 3.9-4.3 g/cm3, the capacity of 145 mAh/g or more when the discharging rate is 0.5-1C and the capacity retention rate of more than 90% after 300 cycles. The positive material prepared by high-temperature fusion has high volume energy density, excellent electrochemical performance, and improved safety and is manufactured economically. Further, a lithium ion secondary battery comprising the positive material is provided.