A kind of preparation method of basic lithium iron phosphate composite material

A technology of lithium iron phosphate and composite materials, applied in phosphorus compounds, chemical instruments and methods, structural parts, etc., can solve the problems of non-standard purity of basic lithium iron phosphate LiFePO and high production cost, and solve the problems of unstable quality, Resolve the effect of low purity

Active Publication Date: 2021-06-29
SHENGNUO OPTOELECTRONICS TECH QH CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a basic lithium iron phosphate composite material and a preparation method thereof, which solves the problem of preparing basic lithium iron phosphate LiFePO by a high-temperature solid-state reaction method. 4 (OH), the production cost is too high, basic lithium iron phosphate LiFePO 4 The purity of (OH) does not meet the standard

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A basic lithium iron phosphate composite material and a preparation method thereof, the method is based on the chemical formula of H 2 SO 4 dilute sulfuric acid with the chemical formula H 3 PO 4 phosphoric acid, lithium hydroxide with chemical formula LiOH and iron powder as raw materials, hydrogen peroxide H 2 o 2 As a catalyst, after the reaction in the reaction vessel, the extraction of basic lithium iron phosphate includes the following steps:

[0029] The first step: selection and placement of the reaction beaker

[0030] Choose two beakers of different sizes, one with a capacity of 500mL and the other with a capacity of 800mL, place a tripod and iron stand on the top of the test bench, place the 500mL beaker on top of the tripod, place the 800mL beaker Asbestos net placed on the iron frame;

[0031] The second step: ferrous sulfate FeSO 4 preparation of

[0032] Hold the 500mL beaker steady by hand, and measure an appropriate amount of 30% dilute sulfuric...

Embodiment 2

[0038] A basic lithium iron phosphate composite material and a preparation method thereof, the method is based on the chemical formula of H 2 SO 4 dilute sulfuric acid with the chemical formula H 3 PO 4 phosphoric acid, lithium hydroxide with chemical formula LiOH and iron powder as raw materials, hydrogen peroxide H 2 o 2 As a catalyst, after the reaction in the reaction vessel, the extraction of basic lithium iron phosphate includes the following steps:

[0039] The first step: selection and placement of the reaction beaker

[0040] Choose two beakers of different sizes, one with a capacity of 500mL and the other with a capacity of 800mL, place a tripod and iron stand on the top of the test bench, place the 500mL beaker on top of the tripod, place the 800mL beaker Asbestos net placed on the iron frame;

[0041] The second step: ferrous sulfate FeSO 4 preparation of

[0042] Hold the 500mL beaker steady with your hands, and measure an appropriate amount of 50% dilute ...

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Abstract

The invention belongs to the technical field of preparation of basic lithium iron phosphate, and in particular relates to a preparation method of basic lithium iron phosphate composite material. The invention comprises the following steps: 1) adding excess iron powder into dilute sulfuric acid to obtain a ferrous sulfate solution; 2) filtering the ferrous sulfate solution prepared in step 1), adding phosphoric acid solution to the filtered solution, and then Adding solid lithium hydroxide and hydrogen peroxide; 3) heating step 2) to obtain a mixed solution, making it react at 68-85° C. to prepare basic lithium iron phosphate. The present invention uses ferrous sulfate as an iron source and adds hydrogen peroxide as a catalyst, so that low-temperature synthesis of basic lithium iron phosphate can be well realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of basic lithium iron phosphate, and in particular relates to a preparation method of basic lithium iron phosphate composite material. Background technique [0002] Lithium battery is a kind of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution. In the 1970s, it was proposed and began to study lithium ion batteries. Due to the very active chemical properties of lithium metal, lithium metal processing, Storage and use have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream now. [0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium metal battery, the fifth generation product of rechargeable battery, was ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/485H01M4/58H01M10/0525
CPCC01B25/45C01P2006/40H01M4/485H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 张成荣刘江华刘冠华展怀瑾马晓东
Owner SHENGNUO OPTOELECTRONICS TECH QH CO LTD
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