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Lithium iron phosphate and production method and application thereof

A technology of lithium iron phosphate and its production method, which is applied in the direction of chemical instruments and methods, phosphorus compounds, electrochemical generators, etc., can solve the problems of low electronic conductivity and ion diffusion rate, charge and discharge performance attenuation, etc., and achieve low temperature performance improvement , The effect of saving production costs

Active Publication Date: 2022-02-25
QINGDAO NINEX NEW ENERGY TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to its inherent characteristics (low electronic conductivity and ion diffusion rate at room temperature, lithium iron phosphate is 10 -8 -10 -10 S / cm and 10 -12 -10 -14 cm 2 / s) lead to a significant attenuation of the charge and discharge performance of batteries with lithium iron phosphate as the cathode material at low temperatures

Method used

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  • Lithium iron phosphate and production method and application thereof
  • Lithium iron phosphate and production method and application thereof
  • Lithium iron phosphate and production method and application thereof

Examples

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Effect test

Embodiment 1

[0030] Such as Figure 1 to Figure 2 As shown, adopt the following steps to prepare lithium iron phosphate:

[0031] (1) ferric chloride solution, phytic acid, (NH 4 )H 2 PO 4 , Ammonia into the reactor, control phytic acid and (NH 4 )H 2 PO 4 The molar ratio is 1:99, and the pH value of the system is adjusted to about 2 by controlling the amount of ammonia water added, and then mixed and stirred in the reaction kettle at room temperature for 1 hour; then the reaction slurry is pumped into the aging kettle for aging for 1 hour to obtain Iron phosphate precursor fluid.

[0032] (2) Lithium carbonate and glucose are added into the aging kettle to fully mix and disperse with the ferric phosphate precursor body liquid, and the obtained mixed slurry is pumped into the finished product tank for temporary storage; then the mixed slurry is pumped into a plate and frame filter for filtration, and then The wet material is added to the flash dryer for flash drying, and then added ...

Embodiment 2

[0034] Such as Figure 1 to Figure 2 As shown, adopt the following steps to prepare lithium iron phosphate:

[0035] (1) ferric chloride solution, phytic acid, H 3 PO 4 , Ammonia into the reactor, control phytic acid and H 3 PO 4 The molar ratio is 1:99, and the pH value of the system is adjusted to about 2 by controlling the amount of ammonia water added, and then mixed and stirred in the reaction kettle at room temperature for 1 hour; then the reaction slurry is pumped into the aging kettle for aging for 1 hour to obtain Iron phosphate precursor fluid.

[0036] (2) Lithium carbonate and glucose are added into the aging kettle to fully mix and disperse with the ferric phosphate precursor body liquid, and the obtained mixed slurry is pumped into the finished product tank for temporary storage; then the mixed slurry is pumped into a plate and frame filter for filtration, and then The wet material is added to the flash dryer for flash drying, and then added to the rotary ki...

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Abstract

The invention discloses lithium iron phosphate as well as a production method and application thereof. The production method of the lithium iron phosphate comprises the following steps: (1) mixing ferric salt, phytic acid and phosphate in water for reaction to obtain an iron phosphate precursor liquid; and (2) mixing the iron phosphate precursor solution with a lithium salt and a carbon source, and then drying and calcining to obtain the lithium iron phosphate. The phytic acid and the phosphate are matched for use, so that the low-temperature performance of the prepared lithium iron phosphate is remarkably improved. Meanwhile, the iron phosphate precursor liquid is directly used for producing lithium iron phosphate, and compared with a traditional method using iron phosphate powder as a raw material, the steps of drying and calcining iron phosphate are omitted, and the production cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium iron phosphate and its production method and application. Background technique [0002] With the continuous reduction of oil resources in the world and the increasingly serious environmental pollution caused by vehicle exhaust, hybrid electric vehicles (HEV) and electric vehicles (EV) have become the substitutes of fuel-driven vehicles in the future and have attracted much attention, and mobile power systems are As one of the key components of electric vehicles. Therefore, batteries with high performance (that is, high specific energy, long life, and safety), low cost, and environmental friendliness will become the focus and focus of the development of the mobile power industry. Lithium-ion batteries are a new generation of green high-energy rechargeable batteries developed to meet this demand. It has outstanding advantages such as high voltage, small size, light we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525C01P2006/40C01P2004/03Y02E60/10
Inventor 辛民昌李长明吴超
Owner QINGDAO NINEX NEW ENERGY TECH CO LTD
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