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Iron phosphate and preparation method thereof

A technology of iron phosphate and phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of charge-discharge performance degradation, low electronic conductivity and ion diffusion rate, etc., and achieve the effect of improving low-temperature performance

Active Publication Date: 2022-01-18
QINGDAO NINEX NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Iron phosphate and preparation method thereof
  • Iron phosphate and preparation method thereof
  • Iron phosphate and preparation method thereof

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Effect test

Embodiment 1

[0032] like Figure 1 to Figure 4 As shown, adopt the following steps to prepare lithium iron phosphate:

[0033] (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 The ferric phosphate precursor fluid is pumped into the finished product tank for temporary storage.

[0034] (2) Dilute the ferric phosphate precursor liquid obtained in step (1) with aqueous ammonia, then pump it into a plate and frame filter for filtration, and wash until neutral; then add the wet material to a flash dryer for flash drying, and then add the rotary Calcined at 400°C in kiln to obtain iron phosphate.

[0035] (3) Add the ...

Embodiment 2

[0037] like Figure 1 to Figure 4 As shown, adopt the following steps to prepare lithium iron phosphate:

[0038] (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 The ferric phosphate precursor fluid is pumped into the finished product tank for temporary storage.

[0039] (2) Dilute the ferric phosphate precursor liquid obtained in step (1) with aqueous ammonia, then pump it into a plate and frame filter for filtration, and wash until neutral; then add the wet material to a flash dryer for flash drying, and then add the rotary Calcined at 400°C in kiln to obtain iron phosphate.

[0040] (3) Add the ferric phosphate...

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Abstract

The invention discloses iron phosphate and a preparation method thereof. The preparation method of the 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; (2) filtering, drying and calcining the iron phosphate precursor liquid to obtain iron phosphate. According to the invention, phytic acid and phosphate are utilized to form a phosphate group as a phosphorus source, the phosphate group and ferric iron salt are synthesized into iron phosphate, and the iron phosphate is used as a precursor to prepare lithium iron phosphate, so that the low-temperature performance of lithium iron phosphate can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an iron phosphate and a preparation method thereof. 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 weight, high speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/45
CPCC01B25/375C01B25/45C01P2004/03C01P2006/40Y02E60/10
Inventor 李长明辛民昌赖永彪
Owner QINGDAO NINEX NEW ENERGY TECH CO LTD