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High-compaction iron phosphate and preparation method of high-compaction lithium iron phosphate

A real lithium iron phosphate, real iron phosphate technology, applied in the preparation/purification of carbon, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of small lithium iron phosphate particles and low compaction density, and achieve a primary particle size. Small, large BET, easy to grind

Inactive Publication Date: 2020-08-14
蒋达金
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particles of lithium iron phosphate are small, and in general, the compaction density is low

Method used

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  • High-compaction iron phosphate and preparation method of high-compaction lithium iron phosphate
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  • High-compaction iron phosphate and preparation method of high-compaction lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method of high compacted ferric phosphate, which comprises the following steps:

[0059] (1) Prepare ferrous sulfate solution, add the oxidant and ammonia water to the ferrous sulfate solution at the same time under agitation, adjust the final pH of the solution to 7.5, then continue to stir for 60min, keep the temperature of the whole process at 45°C, and the stirring speed Be 500r / min, obtain ferric hydroxide colloid;

[0060] (2) Warm up the ferric hydroxide colloid to a temperature of 95°C, then add ammonium bicarbonate solution and phosphoric acid solution simultaneously under stirring, the stirring speed is 400r / min, adjust the pH value of the solution to 1.8, and then continue to react for 60min, Then filter to obtain a filter residue and a filtrate, and the filter residue is washed to obtain a washed filter residue;

[0061] (3) adding the washed filter residue to the sucrose solution, then stirring and dispersing at a high speed, and spray-drying...

Embodiment 2

[0085] A preparation method of high compacted ferric phosphate, which comprises the following steps:

[0086] (1) Prepare the ferrous sulfate solution, add the oxidant and ammonia water to the ferrous sulfate solution at the same time under the condition of stirring, adjust the final pH of the solution to 8, then continue to stir for 60min, keep the temperature of the whole process at 25°C, and the stirring speed Be 300r / min, obtain ferric hydroxide colloid;

[0087] (2) Raise the temperature of the ferric hydroxide colloid to 90°C, then add the ammonium bicarbonate solution and the phosphoric acid solution simultaneously under stirring, the stirring speed is 400r / min, adjust the pH value of the solution to 2.2, and then continue the reaction for 50min, Then filter to obtain a filter residue and a filtrate, and the filter residue is washed to obtain a washed filter residue;

[0088] (3) adding the washed filter residue to the sucrose solution, then stirring and dispersing at ...

Embodiment 3

[0109] A preparation method of high compacted ferric phosphate, which comprises the following steps:

[0110] (1) Prepare ferrous sulfate solution, add the oxidant and ammonia water to the ferrous sulfate solution under stirring conditions, adjust the end point pH of the solution to 7.7, then continue to stir for 50min, keep the temperature of the whole process at 35°C, and the stirring speed Be 400r / min, obtain ferric hydroxide colloid;

[0111] (2) Warm up the ferric hydroxide colloid to a temperature of 93°C, then add ammonium bicarbonate solution and phosphoric acid solution simultaneously under stirring, the stirring speed is 300r / min, adjust the pH value of the solution to 2, and then continue the reaction for 50min, Then filter to obtain a filter residue and a filtrate, and the filter residue is washed to obtain a washed filter residue;

[0112] (3) adding the washed filter residue to the sucrose solution, then stirring and dispersing at a high speed, and spray-drying ...

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Abstract

The invention discloses high-compaction iron phosphate and a preparation method of high-compaction lithium iron phosphate. Firstly, ferric hydroxide colloid is prepared; subsequently, the ferric hydroxide colloid is used as a matrix, phosphoric acid and ammonium bicarbonate are added at high temperature, and iron phosphate with smaller primary particles is obtained; meanwhile, a process of removing crystal water from the obtained ferric phosphate dihydrate is carried out; spray drying after slurrying is performed by adopting a glucose solution, and calcining is performed to obtain iron phosphate. The method comprises the following steps: taking high-compaction iron phosphate as a raw material, grinding slurry by adopting a composite carbon source, carrying out spray drying and primary sintering, adding a dispersing agent (polyethylene glycol solution), carrying out spray drying, coating the surface of lithium iron phosphate with the dispersing agent, and sintering at a higher temperature for a shorter time, thereby obtaining the high-compaction lithium iron phosphate. The obtained high-compaction lithium iron phosphate is small in primary particle size, large in BET, less in particle adhesion and easy to grind, and the prepared high-compaction lithium iron phosphate is high in compaction density, small in primary particle size and good in capacity and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of high-pressure compacted iron phosphate and high-pressure compacted lithium iron phosphate, belonging to the technical field of new energy sources. Background technique [0002] Lithium iron phosphate cathode material has the advantages of high safety and long life, and is an ideal cathode material for lithium-ion power batteries. With the rapid development of new energy vehicles and other related industries, the market demand for power batteries has grown rapidly, and the demand for lithium iron phosphate cathode materials has also grown rapidly. [0003] The preparation process of lithium iron phosphate cathode material is various. Among them, the advantages of using iron phosphate as the precursor to prepare lithium iron phosphate through the carbothermal reduction process have gradually been recognized by people, and may develop into a standard process for the preparation of lithium iron phosphate. ...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01B25/45C01B32/05H01M4/36H01M4/58H01M4/62
CPCC01B25/375C01B25/45C01P2002/72C01P2004/03C01P2004/61C01P2006/12C01B32/05H01M4/366H01M4/5825H01M4/625Y02E60/10
Inventor 蒋达金
Owner 蒋达金
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