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A kind of doped type lithium iron phosphate material and its preparation method and application

A lithium iron phosphate, doped technology, applied in the direction of electrode manufacturing, active material electrodes, electrical components, etc., can solve the problems of the influence of material conductivity and the inability to ensure the uniformity of carbon doping, etc., to achieve good conductivity and simple method Practical, uniform carbon effect

Active Publication Date: 2011-12-07
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the sources of carbon in the existing carbon doping technology are diversified, and the uniformity of carbon doping cannot be guaranteed, which has a certain impact on the electrical conductivity of the material. At present, there is no carbon-containing and conductive material with both carbon and phosphorus elements from the same raw material. Report on Lithium Iron Phosphate Material with Good Properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Weigh 1.0000mol (68.94g) lithium nitrate, 0.4985mol (79.59g) ferric oxide, 1.0000mol (139.96g) trimethyl phosphate, 0.0015mol (0.1528g) Al 2 o 3 , put into the agate ball mill jar at one time, put 260g of agate balls with a diameter of 5.0mm, and mill at high speed for 4 hours to obtain a reddish-brown colloidal mixture, put it into a tube furnace, and under the protection of 99.99% pure argon Raise to 200°C at a heating rate of 15°C / min, maintain at 200°C for 2 hours, raise to 480°C at a heating rate of 4.67°C / min, maintain at 480°C for 2 hours, and cool down to room temperature naturally. Get the brown powder, take it out and put it into an agate ball mill jar, then mill it at high speed for 4 hours, take it out and press it to a density of 1.5g / cm 3 Put it into a tube furnace, under the protection of 99.99% pure argon, raise the temperature to 480°C at a rate of 15°C / min, maintain it at 480°C for 2 hours, and increase the temperature at a rate of 4.5°C / min to 750°C,...

Embodiment 2

[0035] Weigh 1.000mol (68.94g) lithium nitrate, 0.4980mol (79.51g) ferric oxide, 1.000mol (182.00g) triethyl phosphate, 0.0010mol (0.1020g) Al 2 o 3 , 0.0010mol (0.1519g) Cr 2 o 3 , added to the agate ball mill jar at one time, put in 290g of agate balls with a diameter of 5.0mm, and milled at high speed for 4 hours. The reddish-brown colloidal mixture was obtained, put it into a tube furnace, and under the protection of 99.99% pure argon, the temperature was raised to 200°C at a rate of 15°C / min, maintained at 200°C for 4 hours, and then heated at a rate of 4.67°C / min. The heating rate was raised to 480°C, maintained at 480°C for 4 hours, and cooled down to room temperature naturally. Get the brown powder, take it out and put it into an agate ball mill jar, then mill it at high speed for 4 hours, take it out and press it to a density of 1.5g / cm 3 Put it into a tube furnace, under the protection of 99.99% pure argon, raise the temperature to 480°C at a rate of 15°C / min, ma...

Embodiment 3

[0038] Weigh 1.000mol of lithium hydroxide, 0.4975mol (79.44g) of ferric oxide, 1.000mol (224.02g) of tripropyl phosphate, 0.0050mol (0.3735g) of NiO, and add them to the agate ball mill jar at one time, and put 360g of agate balls with a diameter of 5.0mm, high-speed ball milling for 4 hours. The reddish-brown colloidal mixture was obtained, put it into a tube furnace, and under the protection of 99.99% pure argon, the temperature was raised to 200°C at a rate of 15°C / min, maintained at 200°C for 6.5h, and then heated at 4.67°C / min. The heating rate was increased to 480°C, maintained at 480°C for 6.5 hours, and then cooled down to room temperature naturally. Get the brown powder, take it out and put it into an agate ball mill jar, then mill it at high speed for 4 hours, take it out and press it to a density of 1.5g / cm 3 Put it into a tube furnace, under the protection of 99.99% pure argon, raise the temperature to 480°C at a rate of 15°C / min, maintain at 480°C for 6.5h, and ...

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Abstract

The invention discloses a doping lithium iron (II) phosphate material and a preparation method and an application thereof, belonging to the field of lithium ion battery. The chemical formula of the material is LiFe1-xMxPO4 / Cy, wherein, M represents doped element, namely one or more of Y, Al, Cr, Co and Ni, x is 0.003-0.005 and y is 1.22-3.06. Carbon and phosphorus elements of the material are fromthe same raw material so as to ensure the real molecular mixing of carbon and lithium iron (II) phosphate in the prepared material; in addition, trace doped metal can improve the conductivity of thelithium iron (II) phosphate. No conductive agent is needed to add in the material provided by the invention which has larger gram-capacity, and the invention is simple and practical and has large promotional value in the new material field of lithium ion secondary battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, relates to a doped lithium iron phosphate material, and also relates to a preparation method of the doped lithium iron phosphate material and an application in preparing lithium ion battery cathode materials. Background technique [0002] Lithium iron phosphate material has an olivine crystal structure and is one of the popular positive electrode materials for lithium-ion batteries studied in recent years. Its theoretical capacity is 170mAh / g, and its actual capacity is as high as 110mAh / g without doping modification. by LiFePO 4 After surface modification, its actual capacity can be as high as 165mAh / g, which is very close to the theoretical capacity. The operating voltage range is about 2.5 ~ 4.0V. Compared with the positive electrode materials introduced above, LiFePO 4 It has high stability, is safer and more reliable, is more environmentally friendly and has low price. LiFePO 4 The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 陈怀林王青袁春刚
Owner SHUANGDENG GRP
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