PREPARATION METHOD FOR LITHIUM IRON PHOSPHATE COATED WITH FERROBORON ALLOY

Title:

PREPARATION METHOD FOR LITHIUM IRON PHOSPHATE COATED WITH FERROBORON ALLOY

Document Type and Number:

WIPO Patent Application WO/2023/179100

Kind Code:

A1

Abstract:

The present invention relates to a preparation method for lithium iron phosphate coated with a ferroboron alloy, the method comprising: preparing ferrous phosphate and lithium phosphate, mixing the ferrous phosphate and lithium phosphate and then adding a hydrazine hydrate solution thereto, grinding the resulting mixture, drying same and then calcining same, adding pure water to the obtained calcined material and grinding same, adding PEG, ferrous sulfate crystals and EDTA disodium to the obtained slurry, stirring same for dissolution, continuously adding a sodium borohydride solution and a sodium hydroxide solution under a stirring condition, maintaining the pH at 8.5-10.5 during the process, reacting the mixture for 15-30 min, filtering same, washing same and vacuum drying same to obtain lithium iron phosphate coated with a ferroboron alloy. By means of the method, the interface resistance can be reduced, while improving the conductivity, the corrosion resistance, the oxidation resistance and the product compactness degree.

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Inventors:

WANG QIN (CN)

Application Number:

PCT/CN2022/137775

Publication Date:

September 28, 2023

Filing Date:

December 09, 2022

Export Citation:

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Assignee:

HUBEI WANRUN NEW ENERGY TECH CO LTD (CN)

International Classes:

H01M4/36; H01M4/58

Foreign References:

CN114649518A	2022-06-21
CN102255074A	2011-11-23
CN101621122A	2010-01-06
CN102867949A	2013-01-09
CN109301216A	2019-02-01
CN111952547A	2020-11-17
JP2019192513A	2019-10-31
CN202210294927A	2022-03-24
CN201710370271A	2017-05-23
CN201510227614A	2015-05-06
CN201110190384A	2011-07-07

Attorney, Agent or Firm:

ZHONG LUN LAW FIRM (CN)

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