Disclosed in the present invention are nano-meter sheet ferric phosphate, a preparation method therefor and the use thereof. The preparation method includes the following steps: dissolving a phosphorus source and an iron source in an acidic solution, adding an oxidant, and mixing same to obtain a solution containing phosphorus and iron; adding a precipitation auxiliary agent into part of the solution containing phosphorus and iron, heating same until boiling, and then diluting same for a reaction to obtain a primary ferric phosphate slurry; and dropwise adding the remaining solution containing phosphorus and iron into the primary ferric phosphate slurry, and then heating same for a reaction to obtain ferric phosphate. In the present invention, a primary ferric phosphate is prepared by means of a dilution precipitation reaction, and the precipitation auxiliary agent is then added for two-step precipitation to regulate the growth of the ferric phosphate.

The invention relates to a novel process for the preparation of metal-containing compounds comprising the steps of a) forming a mixture comprising i) elemental phosphorus and ii) one or more metal-containing precursor compounds, and b) heating the mixture to a temperature of at least 150 C. Materials made by such a process are useful, for example, as electrode materials in alkali metal-ion battery applications.

The present invention provides a method for preparing battery-grade anhydrous iron phosphate from liquid crude monoammonium phosphate, and belongs to the technical field of chemical industry production. In the present invention, ferrous sulfate solution and liquid crude monoammonium phosphate are used as raw materials, and ferrous iron is oxidized to ferric iron and separates out iron phosphate precipitate under the action of an oxidizing agent to obtain iron phosphate intermediate slurry; and then battery-grade anhydrous iron phosphate is finally obtained through solid-liquid separation, washing, aging, solid-liquid separation, washing, drying, dehydration and breaking up. The method provided by the present invention realizes the resource utilization of liquid crude monoammonium phosphate, has simple process and convenient operation and produces less waste water.

A mixed-metallic phosphate compound is disclosed, which contains as the main metal copper in the divalent oxidation state in a proportion of at least 90.0 at-% and one or more doping metals in a total proportion of the doping metals of at least 0.01 to at most 10.0 at-%, wherein the doping metals are selected from the group consisting of the elements of the first and second main groups and the eighth subgroup of the elements of the periodic table, Al, Sn, Si, Bi, Cr, Mo, Mn, and the lanthanides. The stated metal proportions relate to the total amount of the metals in the mixed-metallic phosphate compound. The mixed-metallic compound has a phosphate content expressed as P.sub.2O.sub.5 in the range of 10 to 60 wt-%. Also disclosed is a method for producing the mixed-metallic phosphate compound and the use thereof.

Ferrous (II) phosphate (Fe.sub.3(PO.sub.4).sub.2) powders, lithium iron phosphate (LiFePO.sub.4) powders for a Li-ion battery and methods for manufacturing the same are provided. The lithium iron phosphate powders are represented by the following formula (II):

LiFe.sub.(1-a)M.sub.aPO.sub.4 (II)

wherein, M, and a are defined in the specification, the lithium iron phosphate powders are composed of plural flake powders, the length of each of the flake powders is 0.1-10 m, and a ratio of the length and the thickness of each of the flake powder is in a range from 11 to 400.

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.

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.

Disclosed in the present invention are a modified iron phosphate precursor, and modified lithium iron phosphate and a preparation method therefor. The modified iron phosphate precursor is prepared by dissolving a soluble ferric salt in a niobium diselenide suspension and then reacting with a phosphoric acid source. The modified iron phosphate precursor can effectively adsorb a lithium source, thereby significantly improving the conductivity of lithium iron phosphate.

The invention relates to a method of recycling lithium iron phosphate batteries with the aim of enabling the isolated recovery of elements from black mass. Black mass comprising at least cathodic and anodic components is immersed in a pH 13-14 solution to obtain a first leachate and first solid residue. The first leachate is immersed in a 4-6M acid solution to obtain a second leachate. The second leachate is passed through a first ion-exchange column where fluoride ions are retained and a second ion-exchange column where copper ions are to obtain a second eluate. The pH of the second eluate is adjusted to about 2.5-5 and a quantity of phosphoric acid that is sufficient to achieve an equivalent stoichiometric ratio of ferric iron and phosphate anions is added to obtain a first solution and an iron (III) phosphate precipitate. The first solution is combined with the first leachate to obtain a second solution. The pH of the second solution is adjusted to about 6.5 to a residual precipitate and a lithium solution.

Ferrous (II) phosphate (Fe.sub.3(PO.sub.4).sub.2) powders, lithium iron phosphate (LiFePO.sub.4) powders for a Li-ion battery and methods for manufacturing the same are provided. The lithium iron phosphate powders are represented by the following formula (II):
LiFe.sub.(1-a)M.sub.aPO.sub.4(II)
wherein, M, and a are defined in the specification, the lithium iron phosphate powders are composed of plural flake powders, the length of each of the flake powders is 0.1-10 m, and a ratio of the length and the thickness of each of the flake powder is in a range from 11 to 400.