Abstract: Disclosed are a separator and a battery including the separator. The separator includes a separator base layer and a ceramic coating disposed on a first surface of the separator base layer. The ceramic coating includes ceramic particles. One or more of a surface and an interior of the ceramic coating have micropores. A porosity of the ceramic coating ranges from 40% to 80%. In the micropores, a volume of pores with apertures greater than 0.1 microns occupies 45%-90% of a total pore volume, and a volume of pores with apertures greater than 1.0 micron occupies 40%-80% of the total pore volume. In the present disclosure, a porosity of the separator is improved, and a rate, a residual liquid volume, low-temperature discharging performance, and cycling performance of the battery are improved. In addition, separator nail penetration strength, self-discharging performance, and safety performance are not affected.

Abstract: The present invention provides a method for preparing a polyanion type sodium battery positive electrode material on the basis of an organic acid dissolution method, comprising the following steps: step S1: preparing a mixture of a transition metal source, a sodium source, and a polyanion source, and putting the mixture into a reactor, the transition metal source being a transition metal simple substance or a transition metal oxide; step S2, adding organic acid into the reactor, heating, and continuously stirring until the transition metal source is completely dissolved; step S3, adding a carbon source, stirring, and drying to obtain precursor powder; and step S4, heating the precursor powder in an inert gas atmosphere, and after the heating treatment is completed, cooling the precursor powder to room temperature along with a furnace to obtain the polyanion type sodium battery positive electrode material.

Abstract: Disclosed are a separator and a battery including the separator. The separator includes a separator base layer and a ceramic coating disposed on a first surface of the separator base layer. The ceramic coating includes ceramic particles. One or more of a surface and an interior of the ceramic coating have micropores. A porosity of the ceramic coating ranges from 40% to 80%. In the micropores, a volume of pores with apertures greater than 0.1 microns occupies 45%-90% of a total pore volume, and a volume of pores with apertures greater than 1.0 micron occupies 40%-80% of the total pore volume. In the present disclosure, a porosity of the separator is improved, and a rate, a residual liquid volume, low-temperature discharging performance, and cycling performance of the battery are improved. In addition, separator nail penetration strength, self-discharging performance, and safety performance are not affected.