High-rate lithium iron phosphate positive electrode material, preparation method thereof, positive electrode of high-rate lithium iron phosphate positive electrode material and battery

A technology of lithium iron phosphate and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low temperature and rate performance defects, and achieve uniform primary particle size, excellent rate and low temperature performance, and low input cost. Effect

Pending Publication Date: 2022-07-08
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, with the development of lithium iron phosphate and the continuous reduction of the cost of lithium iron phosphate batteries, it is the general trend for lithium iron phosphate to be used for start-stop power supply, but the current lithium iron phosphate has certain defects in low temperature and rate performance

Method used

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  • High-rate lithium iron phosphate positive electrode material, preparation method thereof, positive electrode of high-rate lithium iron phosphate positive electrode material and battery
  • High-rate lithium iron phosphate positive electrode material, preparation method thereof, positive electrode of high-rate lithium iron phosphate positive electrode material and battery
  • High-rate lithium iron phosphate positive electrode material, preparation method thereof, positive electrode of high-rate lithium iron phosphate positive electrode material and battery

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Effect test

Embodiment 1

[0030] Ferrous gluconate, tributyl phosphate and lithium acetate were mixed, and the mixture was uniformly stirred at a high speed of 400 r / min at 55° C. to obtain a paste. Wherein, in the ferrous gluconate, phosphate and lithium acetate, the molar ratio of Fe, P and Li is 1:1:1.04.

[0031] The paste obtained above is extruded and granulated and then sent into a saggar. The saggar is put into a roller furnace and calcined under nitrogen protection. The roller furnace includes a first heating section, a first heating section and a first Insulation section, second heating section, second insulation section and cooling section, the paste is heated to 320 °C at a heating rate of 65 °C / h in the first heating section, and kept at 320 °C for 3 hours in the first heating section; Continue to heat up to 690°C at a heating rate of 120°C / h in the second heating section, keep at 690°C for 5 hours in the second holding section, and then cool down to ≤60°C in the cooling section to obtain ...

Embodiment 2

[0049] Ferrous citrate, trioctyl phosphate and lithium acetate were mixed, and the mixture was uniformly stirred at a high speed of 400 r / min at 55° C. to obtain a paste. Wherein, in the ferrous citrate, trioctyl phosphate and lithium acetate, the molar ratio of Fe, P and Li is 1:1:1.07.

[0050] The paste obtained above is extruded and granulated and then sent into a saggar. The saggar is put into a roller furnace and calcined under nitrogen protection. The roller furnace includes a first heating section, a first heating section and a first In the heat preservation section, the second temperature increase section, the second heat preservation section and the cooling section, the paste is heated to 370 °C at a heating rate of 78 °C / h in the first heating section, and kept at 370 °C for 5 hours in the first heat preservation section; Continue to heat up to 790°C at a heating rate of 145°C / h in the second heating section, keep at 790°C for 10h in the second holding section, and ...

Embodiment 3

[0060] Ferrous acetate, tributyl phosphate and lithium citrate were mixed, and the mixture was uniformly stirred at a high speed of 400 r / min at 55° C. to obtain a paste. Wherein, in the ferrous gluconate, phosphate and lithium acetate, the molar ratio of Fe, P and Li is 1:1:1.05.

[0061] The paste obtained above is extruded and granulated and then sent into a saggar. The saggar is put into a roller furnace and calcined under nitrogen protection. The roller furnace includes a first heating section, a first heating section and a first In the heat preservation section, the second temperature increase section, the second heat preservation section and the cooling section, the paste is heated to 320 °C at a heating rate of 60 °C / h in the first heating section, and kept at 320 °C for 4 hours in the first heat preservation section; Continue to heat up to 690°C at a heating rate of 120°C / h in the second heating section, hold at 690°C for 4 hours in the second holding section, and the...

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Abstract

The invention relates to the field of batteries, in particular to a high-rate lithium iron phosphate positive electrode material, a preparation method thereof, a positive electrode thereof and a battery. The invention provides a high-rate lithium iron phosphate positive electrode material. The high-rate lithium iron phosphate positive electrode material comprises lithium iron phosphate and carbon coating the surface of the lithium iron phosphate, and the particle size of primary particles is 30-70nm. The primary particle size is small and uniform, no large single crystal particles exist, the specific surface area is large, and a battery prepared from the material is high in capacity, good in cycle performance and excellent in rate and low-temperature performance. Experiments show that the 10C discharge capacity reaches up to 140 mAh/g or above, the-20 DEG C capacity retention rate is 90% or above, and the requirements of starting and stopping a power supply are met. The invention also provides a preparation method of the high-rate lithium iron phosphate positive electrode material, the preparation process is simple, the environment-friendly effect is realized, a precursor and expensive equipment do not need to be purchased, and the input cost is low.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a high-rate lithium iron phosphate positive electrode material and a preparation method thereof, its positive electrode and a battery. Background technique [0002] At present, the automotive start-stop battery market is mainly monopolized by lead-acid batteries, and the global start-stop battery field is dominated by AGM lead-acid batteries. Research shows that the car start-stop system can save more than 8% of fuel in urban road conditions, and can reduce CO 2 It can start the car quickly and safely, so loading the start-stop power supply has become one of the effective means for the OEM to reduce fuel consumption. [0003] At present, with the development of lithium iron phosphate and the continuous reduction of the cost of lithium iron phosphate batteries, the use of lithium iron phosphate for start-stop power supply has become the general trend, but the current lithium iron phospha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/58H01M10/0525
CPCH01M4/5825H01M4/136H01M4/1397H01M10/0525Y02E60/10
Inventor 王勤
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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