Lithium iron phosphate material, and preparation method and application thereof

A lithium iron phosphate and lithium source technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of complex modification process and inability to industrialize production, and achieve easy repetition and amplification, easy control, and energy The effect of low consumption

Active Publication Date: 2020-09-11
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification process is complex and cannot be produced industrially

Method used

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  • Lithium iron phosphate material, and preparation method and application thereof
  • Lithium iron phosphate material, and preparation method and application thereof
  • Lithium iron phosphate material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A preparation method of lithium iron phosphate material comprises the steps:

[0065] (1) Lithium hydroxide, ferrous oxalate, phosphoric acid, water, urea and ethylenediaminetetraacetic acid are mixed uniformly to obtain a raw material mixed solution, the lithium element in the lithium hydroxide, the iron element in the ferrous oxalate, The mol ratio of phosphorus element in phosphoric acid and water is 3:1:1:51, and the content of described urea is 1wt% of lithium hydroxide, ferrous oxalate and phosphoric acid total amount, and the content of described ethylenediaminetetraacetic acid is 0.5wt% of the total amount of lithium hydroxide, ferrous oxalate and phosphoric acid;

[0066] (2) The raw material mixed solution is subjected to a hydrothermal reaction at 140° C. under a pressure of 5 atm, and the reaction time is 5 hours to obtain a pre-product;

[0067] (3) After aging the pre-product for 5 hours, filter it, and then dry it at 80°C for 18 hours to obtain a lithium...

Embodiment 2

[0069] The difference from Example 1 is that the pressure in step (2) is 1 atm.

Embodiment 3

[0071] The difference with Example 1 is that the pressure in step (2) is 35 atm, and the obtained lithium iron phosphate material such as figure 2 As shown, it can be seen from the figure that the morphology of the obtained lithium iron phosphate is a three-dimensional spherical flower structure formed by stacking sheet-like structures, and the sheet-like structures of lithium iron phosphate are not bonded. Compared with the phosphoric acid obtained in Example 1 The pore size of the iron-lithium material is small and the packing density is high.

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Abstract

The invention relates to a lithium iron phosphate material, and a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing a lithium source, aniron source, a phosphorus source, a template and a chelating agent in water to prepare a raw material mixed solution, wherein the template can generate bubbles in the water; and (2) carrying out a hydrothermal reaction on the raw material mixed solution under a preset pressure to obtain a pre-product. The template and the chelating agent are added into the raw material mixed solution, the templatecan generate bubbles in water to form vacuole films, further, lithium iron phosphate crystals in the raw material mixed solution are promoted to directionally grow along gaps among the vacuole films,the chelating agent can make the vacuole films stably exist in the reaction system under the predetermined pressure, and the size of the vacuole films is controlled by adjusting the pressure of the system so as to stably control the pore size and the morphology of the lithium iron phosphate.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and in particular relates to a lithium iron phosphate material, a preparation method and application thereof. Background technique [0002] With the continuous development of human society, environmental problems have become increasingly prominent. With the rise of the national new energy strategy, lithium-ion batteries, as a clean energy source, have been used since the early 1990s due to their small size, high energy density, safety and environmental protection. So far, it has been widely used. [0003] At present, the common positive electrode materials of lithium ion batteries mainly include lithium cobaltate, lithium manganese oxide, ternary materials and lithium iron phosphate. The advantages of high platform, long cycle life, non-toxic and harmless, and high safety make it stand out from many cathode materials and become the first choice for cathode materials for power-type and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525B82Y40/00
CPCC01B25/45H01M4/5825H01M10/0525B82Y40/00C01P2004/03C01P2006/12C01P2006/17C01P2006/40Y02E60/10
Inventor 危钰王张健吴小珍杨顺毅黄友元
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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