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Preparation method of lithium iron phosphate

A lithium iron phosphate and lithium source technology, applied in chemical instruments and methods, phosphorus compounds, nanotechnology for materials and surface science, etc., can solve the problem of slow diffusion of lithium ions, poor conductivity of lithium iron phosphate, and increased process complexity issues such as safety and safety risks, and achieve the effects of large-scale commercial production, good electrochemical performance, and simple preparation methods

Inactive Publication Date: 2013-10-23
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of lithium iron phosphate is its poor conductivity and slow diffusion of lithium ions.
Both hydrothermal and solvothermal methods require high-pressure reaction devices to complete, and the high-pressure reaction environment increases the complexity of the preparation process and safety risks

Method used

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  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate

Examples

Experimental program
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Effect test

preparation example Construction

[0014] see figure 1 , the embodiment of the present invention provides a preparation method of lithium iron phosphate, which comprises the following steps:

[0015] S1, providing lithium source solution, ferrous source solution and phosphorus source solution respectively, the lithium source solution, ferrous source solution and phosphorus source solution are respectively obtained by dissolving lithium source compound, ferrous source compound and phosphorus source compound in an organic solvent ;as well as

[0016] S2, at a heating temperature of 90 degrees Celsius to 180 degrees Celsius, mix the lithium source solution, ferrous source solution and phosphorus source solution to form a mixed solution and maintain the heating temperature, the lithium source compound, ferrous source compound and phosphorus The source compound undergoes coprecipitation reaction in the mixed solution to generate a coprecipitation product, and the coprecipitation product is lithium iron phosphate. ...

Embodiment 1

[0041] In this embodiment, the lithium source compound is lithium hydroxide (LiOH·H 2 O), the ferrous source compound is ferrous sulfate (FeSO 4 ·7H 2 O), the phosphorus source compound is phosphoric acid (H 3 PO 4 ), wherein lithium: iron: the molar ratio of phosphorus is 3:1:1. The organic solvent is ethylene glycol. The reactor uses a N 2 Protected airtight container, the heating method is silicone oil bath heating. First, under the condition of strong stirring, 0.03mol of H 3 PO 4 and FeSO 4 ·7H 2 O was dissolved in 100ml of ethylene glycol to form the first solution, and then the first solution was slowly added to 200ml of LiOH·H 2 O in ethylene glycol solution to form a mixture. The mixed solution was coprecipitated under heating at 180 degrees Celsius for 60 minutes to form coprecipitates. The co-precipitation reaction is carried out under normal pressure. The airtight container was naturally cooled to room temperature, and the co-precipitated product was c...

Embodiment 2

[0043] The basic conditions of this example are the same as those of Example 1, except that the co-precipitation reaction is carried out in an air environment, and the obtained product is marked as P2.

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Abstract

The invention relates to a preparation method of lithium iron phosphate. The preparation method comprises the following steps of: respectively providing a lithium source solution, a ferrous iron source solution and a phosphorus source solution, wherein the lithium source solution, the ferrous iron source solution and the phosphorus source solution are respectively obtained by dissolving a lithium source compound, a ferrous iron source compound and a phosphorus source compound in an organic solvent; mixing the phosphorus source solution and the ferrous iron source solution to form a first solution; adding the first solution to the lithium source solution to form a mixed solution at the heating temperature of 90-180 DEG C, and keeping the heating temperature; carrying out coprecipitation reaction on the lithium source compound, the ferrous iron source compound and the phosphorus source compound in the mixed solution to generate the lithium iron phosphate. The method disclosed by the invention can be used for fast synthesizing the lithium iron phosphate at lower temperature.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate, in particular to a preparation method of lithium iron phosphate nanosheets. Background technique [0002] Olivine-type lithium iron phosphate, as a kind of positive electrode active material with good safety, low price and environmental friendliness, has been paid great attention to by people. However, the disadvantage of lithium iron phosphate is its poor conductivity and slow diffusion of lithium ions. The existing methods for improving the conductivity of lithium iron phosphate mainly include coating lithium iron phosphate with carbon materials and doping lithium iron phosphate with metal ions. In terms of improving the diffusion rate of lithium ions, people try to nanoscale lithium iron phosphate to shorten the diffusion channel of lithium ions. [0003] The methods for preparing lithium iron phosphate in the prior art include solid-phase method, co-precipitation method, hyd...

Claims

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Application Information

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IPC IPC(8): C01B25/45B82Y30/00B82Y40/00
CPCC01B25/45H01M4/5825Y02E60/10
Inventor 王莉何向明黄超超艾德生
Owner TSINGHUA UNIV
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