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Preparation method for lithium iron phosphate materials with high tap density

A technology of lithium ferrous phosphate and tap density, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve problems such as difficult wide application, small volume-to-capacity ratio, and low tap density

Inactive Publication Date: 2013-06-19
杭州金马新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing a high-tap density lithium iron phosphate material, which mainly solves the technical problems of low tap density, small volume-to-capacity ratio, and difficulty in wide application of lithium iron phosphate materials existing in the prior art.

Method used

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  • Preparation method for lithium iron phosphate materials with high tap density
  • Preparation method for lithium iron phosphate materials with high tap density
  • Preparation method for lithium iron phosphate materials with high tap density

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1: the preparation method of a kind of high tap density lithium iron phosphate material of this example, its steps are:

[0030] a. After mixing lithium salt, iron salt, and phosphorus salt according to the molar ratio of 1.05:1:1, add polyethylene glycol and nickel nitrate, and wet ball mill in a ball mill for 4 hours;

[0031] b. Using a centrifugal spray granulation dryer to spray-dry the raw material obtained in step a, the inlet temperature is 240°C, and the outlet temperature is 100°C to obtain a spherical precursor;

[0032] c. Put the precursor into a gas circulation furnace for sintering under the protection of nitrogen, pre-fire at 400°C for 5 hours and cool to room temperature to obtain a pre-sintered product;

[0033] d. The pre-sintered product was sintered under the protection of nitrogen, the sintering temperature was 680°C, and the temperature was kept constant for 5h to cool to room temperature to obtain LiFePO 4 / C;

[0034] e. The Li...

Embodiment 2

[0037] Embodiment 2: the preparation method of a kind of high tap density lithium iron phosphate material of this example, its steps are:

[0038] a. After mixing lithium salt, iron salt, and phosphorus salt according to the molar ratio of 1.05:1:1, add polyethylene glycol and nickel nitrate, and wet ball mill in a ball mill for 4 hours;

[0039] b. Using a centrifugal spray granulation dryer to spray-dry the raw material obtained in step a, the inlet temperature is 240°C, and the outlet temperature is 100°C to obtain a spherical precursor;

[0040] c. Put the precursor into a gas circulation furnace for sintering under the protection of nitrogen, pre-fire at 400°C for 5 hours and cool to room temperature to obtain a pre-sintered product;

[0041] d. The pre-sintered product was sintered under the protection of nitrogen, the sintering temperature was 680°C, and the temperature was kept constant for 5h to cool to room temperature to obtain LiFePO 4 / C;

[0042] e. The Li...

Embodiment 3

[0044] Embodiment 3: the preparation method of a kind of high tap density lithium iron phosphate material of this example, its steps are:

[0045] a. After mixing lithium salt, iron salt, and phosphorus salt according to the molar ratio of 1:1:1, add polyethylene glycol and nickel nitrate, and wet ball mill in a ball mill for 4 hours;

[0046] b. Using a centrifugal spray granulation dryer to spray-dry the raw material obtained in step a, the inlet temperature is 240°C, and the outlet temperature is 100°C to obtain a spherical precursor;

[0047] c. Put the precursor into a gas circulation furnace for sintering under the protection of nitrogen, pre-fire at 400°C for 5 hours and cool to room temperature to obtain a pre-sintered product;

[0048]d. The pre-sintered product was sintered under the protection of nitrogen, the sintering temperature was 680°C, and the temperature was kept constant for 5h to cool to room temperature to obtain LiFePO 4 / C;

[0049] e. The LiFePO...

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Abstract

The invention relates to preparation methods for lithium iron phosphate, in particular to a preparation method for lithium iron phosphate materials with high tap density. The preparation method for the lithium iron phosphate materials with the high tap density mainly solves the technical problems that in the prior art, lithium iron phosphate materials are low in tap density, small in volume capacity ratio, not prone to be widely used and the like. The preparation method comprises the steps of mixing lithium salt, ferric salt and phosphor salt, adding a doped modifying agent and a carbon source, carrying out wet process ball milling in a ball milling machine, carrying out spray drying, pre-sintering a dried precursor in inertia or reducing atmosphere, after preserving temperature, cooling to the room temperature along with a furnace, obtaining a pre-sintered product, sintering the pre-sintered product in an inertia or reducing atmosphere protective furnace at a high temperature, cooling to the room temperature along with the furnace, obtaining LiFePO4 / C, placing the LiFePO4 / C into a rotation type fusion balling machine for processing, and finally preparing the finished product of the lithium iron phosphate materials with the high tap density.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate, in particular to a preparation method of a high tap density lithium iron phosphate material. Background technique [0002] Commercially available lithium-ion cathode materials mainly include LiCoO 2 , LiMn 2 o 4 、LiFePO 4 Wait. LiCoO 2 It is currently the leading cathode material for commercialization, but with low safety factor, scarcity of cobalt resources and high cost, the market share shows a trend of decreasing year by year. LiMn with spinel structure 2 o 4 The cost is low, but the capacity is low and the cycle performance is poor. LiFePO 4 The positive electrode material has high theoretical capacity (170mAh / g), long cycle life (2000 times), and works stably without abnormal changes under high temperature environment. [0003] Table 1 for LiCoO 2 , LiMn 2 o 4 、LiFePO 4 Theoretical tap density and actual tap density. [0004] Cathode material LiCoO ...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 李旺王张志苍松王叶滔顾建锋王汉杰
Owner 杭州金马新能源科技有限公司
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