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1. 发明公开

EP4393874A1 METHOD FOR PREPARING LITHIUM IRON PHOSPHATE FROM TITANIUM DIOXIDE BY-PRODUCT OF FERROUS SULFATE 审中-实审
公开(公告)号：EP4393874A1
公开(公告)日：2024-07-03
申请号：EP22931667.4
申请日：2022-07-26
申请人： Shenzhen Warrant New Energy Co., Ltd.
发明人： TIAN, Yihong
IPC分类号： C01B25/45 , H01M4/58 , H01M10/0525 , C01B32/05
CPC分类号： Y02E60/10
摘要： The present invention relates to the field of lithium battery material preparation technologies, particularly to a method for preparing lithium iron phosphate using the by-product ferrous sulfate from titanium dioxide. The method comprises the following steps: adjusting the pH of water by adding sulfuric acid, then dissolving by-product ferrous sulfate from titanium dioxide in the water, and adding iron powder for stirring and reaction; adding iron phosphate or lithium iron phosphate waste powder to the solution, heating and stirring the mixture, allowing the mixture to settle and cool, and filtering the cooled mixture to obtain a purified ferrous sulfate solution; and adding phosphoric acid and a lithium hydroxide solution in a co-current manner in an autoclave, and finally adding the purified ferrous sulfate solution, heating the mixture under stirring, then filtering, washing, and drying the mixture to obtain lithium iron phosphate powder. In the present invention, during the purification of the ferrous sulfate solution, iron phosphate or lithium iron phosphate waste powder is used as a precipitant. The resultant ferrous sulfate solution has a titanium content of less than 10 ppm, with no impurity elements other than iron, phosphorus, and lithium introduced. The ferrous sulfate solution is used as an iron source for preparing lithium-ion battery positive electrode materials, and the material exhibits excellent electrochemical performance, achieving effective utilization of titanium dioxide by-products.

2. 发明公开

EP4393875A1 HYDROTHERMAL SYNTHESIS METHOD FOR NANO LITHIUM MANGANESE IRON PHOSPHATE 审中-实审
公开(公告)号：EP4393875A1
公开(公告)日：2024-07-03
申请号：EP22937121.6
申请日：2022-08-05
申请人： Shenzhen Warrant New Energy Co., Ltd.
发明人： TIAN, Yihong
IPC分类号： C01B25/45 , C01B32/15 , B82Y40/00 , B82Y30/00
CPC分类号： Y02E60/10
摘要： The present invention relates to the technical field of preparation of lithium battery raw materials, especially to a hydrothermal synthesis method for nano lithium iron manganese phosphate, including the following steps: mixing lithium phosphate with water, adding them to autoclave 1, heating from room temperature to 140-150°C while stirring to obtain slurry A; dissolving ferrous sulfate and manganese sulfate in water, adding them to autoclave 2, and heating to 140-150°C to obtain slurry B; heating autoclave 3 to 140-150°C, adding slurry A and slurry B in concurrent flow to autoclave 3, stirring, maintaining reaction at 140-150°C for 2-4 hours; stopping heating, cooling, opening a discharge valve, filtering product, washing filter cake, drying in vacuum to obtain lithium iron manganese phosphate powder, and coating with carbon. High-temperature mixing of reaction raw materials creates a true molecular mixing reaction starting condition. Prepared material particles are uniform with a three-dimensional scale reaching a nano scale, which is conducive to shortening lithium ion diffusion paths, fundamentally improving electrochemical performance of the material and prolonging its cycle life.

3. 发明公开

EP4393583A1 PRODUCTION APPARATUS FOR SYNTHESIZING LITHIUM IRON PHOSPHATE BY MEANS OF HYDROTHERMAL METHOD 审中-实审
公开(公告)号：EP4393583A1
公开(公告)日：2024-07-03
申请号：EP22939662.7
申请日：2022-07-26
申请人： Shenzhen Warrant New Energy Co., Ltd.
发明人： TIAN, Yihong
IPC分类号： B01J19/18 , C01B25/45 , F26B25/06 , F24H9/1809 , F17D1/14 , F17D3/01 , F17D3/18
摘要： The present invention relates to the field of lithium battery raw material preparation technologies, in particular to a production apparatus for hydrothermal synthesis of lithium iron phosphate. The production apparatus comprises first stirring devices, a preheating device, a second stirring device, and a drying device, wherein there are two first stirring devices, and the preheating device comprises a housing, a heating box, two feeding pumps, two first transfer assemblies, and several first heating tubes; the two first transfer assemblies each comprise an inlet pipe, an outlet pipe, and several transfer branch tubes. In the present application, the arrangement of multiple transfer branch tubes increases the heated surface area of the slurry, enhances the thermal conduction efficiency, and improves the heating effect. The equidistant arrangement of the transfer branch tubes ensures uniform heating of the slurry within the multiple transfer branch tubes, guaranteeing the heating effect. The arrangement of the preheating device can reduce the heating time of the slurry, thereby enhancing the heating effect

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