US 2020/0028171 A1Published application

Method of synthesizing phosphate salt of high purity for preparation of electrode material

AssigneesGuangxi Nowphene Energy Storage Technologies Co., Ltd, Boston Global Technologies, LLC

InventorsGuiqing Huang, Boshan Mo, Youde Mo

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Abstract

The present invention provides a cost-effective method of synthesizing phosphate salt of a metal M such as Fe and Mn that can be used for electrode active material of a lithium secondary battery. An oxidization-precipitation reaction is carried out on metal such as Fe(II) and Mn(II) to produce phosphate salt and hydroxide of the metal oxidized e.g. Fe(III) and Mn(III). With overdosed phosphoric acid, hydroxide of the oxidized metal is then converted to a phosphate salt. The invention also provides a method of preparing “wet” phosphate salt nanoparticles and their application in the synthesis of a cathode material. The present invention exhibits numerous technical merits such as lower cost, easier operation, and being environmentally friendly.

Claims20

Dependent claims

A method of synthesizing a high-purity phosphate salt of a metal M, comprising:

(i) providing an aqueous solution of metal M(Va) having a first valence value Va;
(ii) adding a precipitating-oxidizing composition to the aqueous solution to produce a liquid phase and a precipitate of metal M(Vb) having a second valence value Vb, wherein the second valence value Vb is greater than the first valence value Va, and wherein the precipitate of metal M(Vb) comprises phosphate salt of metal M(Vb), hydroxide of metal M(Vb), or any mixture thereof;
(iii) isolating said precipitate of metal M(Vb) from the liquid phase;
(iv) adding phosphoric acid and water to the isolated precipitate of metal M(Vb), and heating the reaction mixture to an elevated temperature to convert hydroxide of metal M(Vb) in the isolated precipitate to phosphate salt of metal M(Vb).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/038,155Filed 17 Jul 2018
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H01M 4/5825
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
C01B 25/37
Phosphates: phosphates of heavy metals
C01B 25/45
Phosphates: containing plural metal, or metal and ammonium
H01M 4/0442
Activating, forming or electrochemical attack of the supporting material: anodisation, Oxidation