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Preparation method of high-rate lithium iron phosphate positive electrode material

A cathode material, lithium iron phosphate technology, applied in the field of preparation of high-rate lithium iron phosphate cathode materials, can solve the problems of uneven particles, large material particles, etc., and achieve the effect of good rate performance and cycle stability

Active Publication Date: 2022-01-14
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is mainly to solve the problem that the above-mentioned high-temperature solid-phase method prepares the lithium iron phosphate positive electrode material, which easily causes the primary particles of the material to be large and the particles are uneven, and proposes a new high-rate lithium iron phosphate positive electrode material and its preparation method.

Method used

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  • Preparation method of high-rate lithium iron phosphate positive electrode material
  • Preparation method of high-rate lithium iron phosphate positive electrode material
  • Preparation method of high-rate lithium iron phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh first. First weigh 25g of anhydrous ferric phosphate, 6.3g of lithium carbonate, 2.64g of glucose, 0.32g of PEG2000, and 0.25g of titanium dioxide, and disperse the above materials in 5.3g of deionized water, ball mill for 2h, and then transfer to Put into the sand mill, the D50 particle size of the sand mill is controlled at 100-200 nm, so that the iron source, lithium source, carbon source, metal ion dopant and other raw materials are fully mixed evenly, and then centrifugal spray drying is used to obtain a light yellow precursor powder. Put the precursor in a graphite sagger, sinter at high temperature under the protection of nitrogen atmosphere, the sintering cycle is 18-20h, the holding temperature during sintering is 650-700°C, cool naturally, and then pulverize through jet mill, and get high rate after removing iron Lithium iron phosphate cathode material.

Embodiment 2

[0040] Weigh first. First weigh 25g of anhydrous ferric phosphate, 6.3g of lithium carbonate, 3.8g of sucrose, 0.78g of PEG2000, and 0.25g of titanium dioxide, and disperse the above materials in 5.3g of deionized water, ball mill for 2h, and then transfer to Put into the sand mill, the D50 particle size of the sand mill is controlled at 100-200 nm, so that the iron source, lithium source, carbon source, metal ion dopant and other raw materials are fully mixed evenly, and then centrifugal spray drying is used to obtain a light yellow precursor powder. Put the precursor in a graphite sagger, sinter at high temperature under the protection of nitrogen atmosphere, the sintering cycle is 18-20h, the holding temperature during sintering is 650-700°C, cool naturally, and then pulverize through jet mill, and get high rate after removing iron Lithium iron phosphate cathode material.

[0041] Example 2

[0042]Weigh first. First weigh 25g of anhydrous iron phosphate, 6.3g of lithiu...

Embodiment 3

[0044] Weigh first. First weigh 25g of anhydrous iron phosphate, 6.3g of lithium carbonate, 5.68g of glucose, 0.32g of PEG2000, and 0.31g of zirconium dioxide, and disperse the above raw materials in 5.3g of deionized water, ball mill for 2h, and then Turn to sand milling, control the D50 particle size of sand milling at 100-200 nm, fully mix raw materials such as iron source, lithium source, carbon source, metal ion dopant, etc., and then use centrifugal spray drying to obtain light yellow precursor body powder. Put the precursor in a graphite sagger, sinter at high temperature under the protection of nitrogen atmosphere, the sintering cycle is 18-20h, the holding temperature during sintering is 650-700°C, cool naturally, and then pulverize through jet mill, and get high rate after removing iron Lithium iron phosphate cathode material.

[0045] The lithium iron phosphate material prepared in Example 1 was characterized by a Japanese Rigaku X-ray powder diffractometer (XRD)....

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Abstract

The invention relates to a high-rate lithium iron phosphate positive electrode material and a preparation method thereof. The preparation method comprises the steps: firstly, weighing an iron source and a lithium source according to a molar ratio of 1:1-1:1.05, then weighing a carbon source accounting for 5-15% of the total mass of the iron source and the lithium source and a metal ion doping agent accounting for 0-1% of the total mass of the iron source and the lithium source, adding water, carrying out ball milling and sanding, controlling sanding D50 to be 100-200 nm, and then spraying to obtain a precursor; and putting the precursor into a sintering furnace, introducing nitrogen for protection at the same time, sintering at 650-700 DEG C, cooling to obtain a sintered material, crushing the sintered material, and screening to remove iron to obtain the lithium iron phosphate. The prepared lithium iron phosphate has good rate capability and cycling stability, the 0.1 C discharge capacity of the lithium iron phosphate reaches 160 mAh / g, the 10 C discharge capacity of the lithium iron phosphate reaches 140 mAh / g, the microstructure of the positive electrode material is spherical-like particles, and the average value of primary particles is 100 nm.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to the preparation of positive electrode materials of lithium ion batteries, in particular to a preparation method of high rate lithium iron phosphate positive electrode materials. Background technique [0002] Although traditional lead-acid batteries have mature technology and low cost, their quality and volumetric energy density are low, their cycle life is short, and there is a risk of lead pollution in the industrial chain. Lithium iron phosphate polyanionic lithium iron phosphate, the positive electrode material of lithium ion battery, has the advantages of high theoretical capacity, good thermal stability, good cycle performance, stable structure, and environmental friendliness, and has attracted widespread attention, especially in power batteries and starters. outage power field. As the technology of lithium iron phosphate becomes more and more mature, the applicatio...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525H01M2004/028C01P2006/12C01P2006/40C01P2004/62C01P2004/61C01P2004/45Y02E60/10H01M2004/021H01M4/36H01M4/625H01M4/485H01M10/052C01P2004/32C01P2004/60H01M4/0471H01M4/58
Inventor 杨娇娇王勤程国章高川赵旭余随淅
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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