Abstract: The present disclosure relates to a method for activating a crop seed by high-voltage electric field cold plasma (HVCP), and use thereof, belonging to the technical field of crop planting. The present disclosure provides a method for activating a crop seed by HVCP, including the following steps: (1) mixing a crop seed with water and immersing the crop seed in water for 4 h to 24 h to obtain an immersed crop seed; and (2) conducting discharge activation on the immersed crop seed at a voltage of 80 kV to 130 kV to obtain an activated crop seed. In the present disclosure, the method can improve heat-resistant and disease-resistant properties of crops, and provide a scientific basis for subsequent acquisition of excellent seeds.

Abstract: Provided is a sodium ion battery cathode material and a preparation method therefor and application thereof. A chemical formula of the sodium ion battery cathode material is NamNixFeyMnzO2, where 0.1?x?0.25, 0.5?y?0.8, 0.1?z?0.25, 0.8?m?1.1, 0.95?x/z?1.05, and x+y+z=1, m, x, y and z are molar percentages of corresponding elements, respectively, and each component in the chemical formula satisfies charge conservation and stoichiometry conservation.

Abstract: Provided is a preparation method for a lithium oxide material, including the following steps: mixing lithium carbonate, a carbon source and a dispersant according to a certain proportion, stirring and dispersing and carrying out wet grinding to obtain an intermediate solution; carrying out spray drying on the intermediate solution to obtain an intermediate, and sintering and pulverizing the intermediate under a protection atmosphere to obtain a lithium oxide material. The prepared lithium oxide is uniform in particle and high in purity. The technical process is simple, and suitable for large-scale industrial production. A prepared lithium oxide material is also provided.

Abstract: The present disclosure provides a carbon-encapsulated lithium manganese iron phosphate material having a composition of: LiFe1-x-yMnxMyPO4@C, where M includes at least one of Mg, V, Zr, Nb, In, Al, Co and Ni, 0.5?x?0.8, 0<y?0.02, and C is encapsulated carbon. The material has a secondary gradation structure with tightly bound material gradation, high compaction density, and excellent electrochemical performance. The present disclosure further provides a method for preparing a carbon-encapsulated lithium manganese iron phosphate material, which has a simple process flow and is suitable for application in large-scale industrial production. The present disclosure further provides a lithium ion battery in which the carbon-encapsulated lithium manganese iron phosphate material is applied.

Abstract: The present disclosure provides a method for preparing lithium iron phosphate from ferric hydroxyphosphate, including: purifying ferrous sulfate to form a ferrous sulfate solution, adding hydrogen peroxide, phosphoric acid, an ammonium dihydrogen phosphate solution and ammonia water into the ferrous sulfate solution and then reacting to form a mixed slurry, holding the mixed slurry at a temperature for a period of time, and then washing with water and subjecting to press filtration to form ferric hydroxyphosphate precursors with different iron-phosphorus ratios; then flash drying, sintering at a high temperature, and pulverizing to obtain ferric hydroxyphosphate precursors with different iron-phosphorus ratios and different specific surface areas.

Abstract: The present disclosure relates to the technical field of lithium ion battery cathode materials, and particularly discloses a method for preparing a carbon-coated lithium iron phosphate material from ferrous phosphate. The method comprises: mixing self-made ferrous phosphate with a carbon source, and sintering at a low temperature under nitrogen to remove a part of crystal water to obtain carbon-coated ferrous phosphate with a small amount of crystal water; evenly mixing ferrous phosphate with a lithium source, a phosphorus source and multiple carbon sources, and adjusting until a proper iron-to-phosphorus ratio is 0.960-0.975 and a carbon content is 1.5%-1.8%; subsequently drying slurry to obtain material powder; and sintering the material powder through a two-stage temperature rising curve, naturally cooling and then pulverizing to obtain the carbon-coated lithium iron phosphate material.

Abstract: The present disclosure belongs to technical field of cathode materials of lithium batteries, and discloses a preparation method of high-safety high-capacity lithium manganese iron phosphate.

Abstract: The present disclosure belongs to the technical field of lithium battery cathode materials, and discloses a preparation method of multiple carbon-coated high-compaction lithium iron manganese phosphate, comprising the following steps: (1) synthesizing a carbon and vanadium co-doped ferromanganese phosphate precursor through a co-precipitation method, sintering, and removing crystal water to obtain an anhydrous ferromanganese phosphate precursor; (2) adding lithium phosphate, a supplemental phosphorus source, an organic carbon source, a dopant and deionized water, and performing ball milling, wet sanding, spray drying and sintering to obtain an intermediate material; and (3) adding deionized water and the organic carbon source, then performing ball milling, sanding, spray drying, sintering and air jet pulverization to obtain multiple carbon-coated high-compaction lithium iron manganese phosphate.