Lithium iron phosphate material as well as preparation method and application thereof

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of lithium-ion battery cathode materials, can solve the problems of the limit of nanometerization, low energy utilization rate, and high energy consumption, so as to reduce the difficulty of nanometerization, improve the energy density of batteries, and The effect of simple process

Pending Publication Date: 2021-07-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The nanonization process in this process generally uses the zirconium balls in the sand mill to squeeze and crush the raw materials. The energy utilization rate of this process is low. If the high-magnification lithium iron phosphate material is prepared, in order to achieve the required The slurry needs to be repeatedly ground, and there is a grinding limit, so the process is time-consuming and energy-intensive
In addition, in some preparation processes, dispersants such as polyethylene glycol are added during grinding to improve the degree of nanonization of particles, but there is still a limit to the degree of nanonization.

Method used

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  • Lithium iron phosphate material as well as preparation method and application thereof

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preparation example Construction

[0024] The first aspect of the present invention provides a method for preparing a lithium iron phosphate material, comprising the following steps:

[0025] Mix and stir the ferric phosphate and the organic acid solution to obtain a mixed solution;

[0026] Grinding the mixed solution until the iron phosphate particle size D50≤150nm, then mixing and stirring it with lithium carbonate and carbon source to obtain a slurry;

[0027] The slurry is dried, granulated, and calcined to obtain a lithium iron phosphate material.

[0028] The preparation method utilizes that organic acids can ionize hydrogen ions and iron phosphate has the characteristics of being easily dissociated under the action of hydrogen ions. First, lithium iron phosphate is mixed and ground with an organic acid solution. Since the organic acid ionizes hydrogen ions, lithium iron phosphate It is easier to be ground, so that the iron phosphate particles can quickly reach the required degree of nanometerization un...

Embodiment 1

[0039] The preparation method of lithium iron phosphate in the present embodiment specifically comprises the following steps:

[0040] Weigh 1000kg of ferric phosphate and add it into 1500L of acetic acid solution with a concentration of 0.05mol / L, and stir for 0.5h to obtain a mixed solution;

[0041] After the mixed solution was ground to D50=100-150nm by a sand mill, 249kg of lithium carbonate and 110kg of glucose monohydrate were added thereto, and after stirring for 1 hour, a slurry was obtained;

[0042] The slurry is dried and granulated by a centrifugal spray dryer to obtain a lithium iron phosphate precursor;

[0043] The lithium iron phosphate precursor is calcined in a nitrogen-protected atmosphere furnace at a temperature of 620°C for 5 hours to obtain a lithium iron phosphate material; if necessary, the lithium iron phosphate material can be crushed into a required particle size by a jet mill .

Embodiment 2

[0055] The difference between the preparation method of the lithium iron phosphate material in this example and Example 1 is that in the step of obtaining the mixed solution, the concentration of the acetic acid solution is 0.09 mol / L.

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Abstract

The invention discloses a lithium iron phosphate material and a preparation method and application thereof. The preparation method of the lithium iron phosphate material comprises the following steps: mixing and stirring iron phosphate and an organic acid solution to obtain a mixed solution; grinding the mixed solution until the particle size D50 of the iron phosphate is less than or equal to 150 nm, and then mixing and stirring the iron phosphate with lithium carbonate and a carbon source to obtain slurry; and drying, granulating and calcining the slurry to prepare the lithium iron phosphate material. According to the preparation method, the lithium iron phosphate material with high rate capability can be prepared at a relatively low cost, and the preparation method is simple in process flow and high in production efficiency and has application prospects.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a lithium iron phosphate material and a preparation method and application thereof. Background technique [0002] Lithium iron phosphate batteries have the advantages of high energy, long cycle life, and good safety performance. They have been widely used in portable devices, power batteries, and electrochemical energy storage. However, to meet the growing demand for electrical performance is the current iron phosphate A key challenge for lithium-ion batteries. [0003] The current mainstream lithium iron phosphate material preparation process mainly includes the following steps: mix iron phosphate, lithium carbonate and carbon source in pure water, and then conduct the nanometerization process through a sand mill, and spray the obtained slurry after the nanometerization process is completed. Granulating to obtain a precursor, whic...

Claims

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Application Information

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IPC IPC(8): C01B25/45B82Y30/00B82Y40/00H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525B82Y30/00B82Y40/00C01P2006/40Y02E60/10
Inventor 姚停庞海波高海峰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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