A comprehensive recycling method for a waste lithium iron phosphate battery relates to a waste lithium ion battery recycling technology, and particularly comprises: first selectively extracting lithium, and then using a lithium extraction residue to prepare iron phosphate, the using the lithium extraction residue to prepare the iron phosphate comprising: adding the lithium extraction residue to water to form a slurry, adding hydrochloric acid and stirring to react, so that iron is completely dissolved, performing solid-liquid separation, on the basis of iron and phosphorus contents of the obtained liquid, adding trisodium phosphate or ferric chloride, and then adding a sodium hydroxide solution to precipitate crude iron phosphate; and then performing reverse three-stage washing to remove impurities to obtain a battery iron phosphate product. The problem of environmental protection is solved and meanwhile, all of the valuable elements are recycled, and a relative cost is greatly reduced by about 25%.

A method for manufacturing metal phosphate hydrate nanoparticles wherein metal reactants are selected from metal precursors of transition metals,phosphate precursors are selected from: Trisodium phosphate Na.sub.3PO.sub.4, disodium phosphate Na.sub.2HPO.sub.4, phosphoric acid H.sub.3PO.sub.4 and hypophosphoric acid H.sub.4P.sub.2O.sub.6, wherein said method comprises the following step of a reaction medium comprising at least a metal reactant, a phosphate precursor and a solvent, is submitted to a solvothermal treatment at a pressure superior to 50 MPa, and at a temperature of from 100 to 350° C.

An energy storage composition can be used as a new Na-ion battery cathode material. The energy storage composition with an alluaudite phase of A.sub.xT.sub.y(PO4).sub.z, Na.sub.xT.sub.y(PO4).sub.z, Na.sub.1.702Fe.sub.3(PO4).sub.3 and Na.sub.0.872Fe.sub.3(PO4).sub.3, is described including the hydrothermal synthesis, crystal structure, and electrochemical properties. After ball milling and carbon coating, the compositions described herein demonstrate a reversible capacity, such as about 140.7 mAh/g. In addition these compositions exhibit good cycling performance (93% of the initial capacity is retained after 50 cycles) and excellent rate capability. These alluaudite compounds represent a new cathode material for large-scale battery applications that are earth-abundant and sustainable.

The present invention relates to a process for forming or obtaining vivianite in or from a phosphorus-containing waterbody, sediment and/or sludge, to an apparatus for obtaining vivianite from a phosphorus-containing waterbody, sediment and/or sludge, and to the use of a composition comprising at least one alkaline earth metal peroxide and a magnetic separating apparatus for obtaining vivianite from a phosphorus-containing waterbody, sediment and/or sludge.

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. The nano lithium iron phosphate material prepared by the method has high compaction, high capacity and long cycle performance.

A method of preparing ferric phosphate from iron-containing waste, including: step a) providing a ferric chloride-containing mixture solution obtained from acidolysis of iron-containing waste; step b) adjusting pH of the ferric chloride-containing mixture solution to satisfy 0<pH≤2 and Fe.sup.3+ concentration to 10-80 g/L with an alkaline compound and water, to obtain an iron source solution; step c) mixing and reacting the iron source solution obtained from the step b) with a solution of calcium dihydrogen phosphate in a molar ratio of P to Fe of 1 : 1-1.8, to obtain a slurry with a pH of 0.2-2; and step d) performing aging and crystal transformation on the slurry, to obtain ferric phosphate. A battery-grade ferric phosphate with high purity and good product quality can be obtained without the need for deep purification of raw materials.

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. The method includes the steps: (1) synthesizing a ferrous phosphate precursor through a co-precipitation process, and sintering to obtain an anhydrous ferrous phosphate precursor; (2) synthesizing a manganese phosphate precursor through co-precipitation process, and sintering to obtain an anhydrous manganese phosphate precursor; (3) adding lithium phosphate and deionized water into anhydrous ferrous phosphate precursor, and performing ball milling and wet sanding to obtain slurry A; (4) adding lithium phosphate, an organic carbon source, a dispersant, a dopant and deionized water into anhydrous manganese phosphate precursor, and performing ball milling and wet sanding to obtain slurry B; and (5) mixing slurry A with slurry B, and performing ball milling, spray drying, sintering and air jet pulverization to obtain high-safety high-capacity lithium manganese iron phosphate.

The present invention relates to strongly coloured manganese ferrite colour pigments, to the production thereof and to the use thereof.

An LFP electrode material is provided which has improved impedance, power during cold cranking, rate capacity retention, charge transfer resistance over the current LFP based cathode materials. The electrode material comprises crystalline primary particles and secondary particles, where the primary particle is formed from a plate-shaped single-phase spheniscidite precursor and a lithium source. The LFP includes an LFP phase behavior where the LFP phase behavior includes an extended solid-solution range.

A preparation method of battery composite material includes steps of providing a manganese-contained compound, phosphoric acid, a lithium-contained compound, a carbon source, and deionized water; processing a reaction of the manganese-contained compound, the phosphoric acid, and a portion of the deionized water to produce a first product; placing the first product at a first temperature for at least a first time period to produce a first precursor, wherein the chemical formula of the first precursor is written by Mn.sub.5(HPO.sub.4).sub.2(PO.sub.4).sub.2(H.sub.2O).sub.4; and processing a reaction of at least the first precursor, the lithium-contained compound, and another portion of the deionized water, adding the carbon source, and then calcining to produce battery composite material. Therefore, the preparation time is shortened, the energy consuming is reduced, the phase forming of the precursor is more stable, and the advantages of reducing the cost of preparation and enhancing the quality of products are achieved.