Nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite cathode material and preparation method thereof

A technology of rare earth metal ions and lithium iron phosphate, which is applied in the field of lithium-ion batteries, can solve the problems of low ion mobility, affecting cycle capacity and battery rate charge and discharge performance, etc., to increase specific capacity, increase rate charge and discharge performance, and improve Hydrophilic effect

Pending Publication Date: 2021-04-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate is affected by its own structure, and its ion mobility is low, which in turn affects the cycle capacity and the rate charge and discharge performance of the battery.

Method used

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  • Nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite cathode material and preparation method thereof
  • Nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite cathode material and preparation method thereof
  • Nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add 25ml of hydrazine hydrate with a solute mass fraction of 30% into 50ml of deionized water, then add 300mg of carbon nanotubes, heat and reflux at 60°C for 6h, wash and suction filter with deionized water, and freeze-dry the solid obtained by suction filtration to obtain Nitrogen-doped carbon nanotubes.

[0024] (2) Add 5.0g of lithium hydroxide, 30.0g of iron phosphate, 50.0g of oxalic acid, 5.0g of glucose, and 10.0g of deionized water into a three-necked flask, and then add 4.5g of cerium oxide to it. Heating to 90°C and keeping it for 5 hours, then cooling down to room temperature, vacuum distillation to 80°C, taking out and drying, then adding ethanol to the material and ball milling for 3 hours, after drying, put the material in N 2 Calcined at 400°C for 5 hours in a protected tubular muffle furnace, cooled to room temperature, taken out, then added ethanol and ball milled for 6 hours, after drying, the material was placed in N 2 Calcined at 700°C for 10 h...

Embodiment 2

[0027] (1) Add 50ml of hydrazine hydrate with a solute mass fraction of 30% into 50ml of deionized water, then add 300mg of carbon nanotubes, heat and reflux at 60°C for 6h, wash and suction filter with deionized water, and freeze-dry the solid obtained by suction filtration to obtain Nitrogen-doped carbon nanotubes.

[0028] (2) Add 5.0g of lithium hydroxide, 25g of iron phosphate, 45g of oxalic acid, 3.0g of glucose, and 8g of deionized water into a three-necked flask, and then add 1.56g of Tm 2 o 3 Under rapid stirring, the water bath was heated to 90°C and kept for 5 hours, then lowered to room temperature, then vacuum distilled to 80°C, taken out and dried, then added ethanol to the material and ball milled for 3 hours, after drying, the material was placed in N 2 Calcined at 400°C for 5 hours in a protected tubular muffle furnace, cooled to room temperature, taken out, then added ethanol and ball milled for 6 hours, after drying, the material was placed in N 2 Calcine...

Embodiment 3

[0031] (1) Add 50ml of hydrazine hydrate with a solute mass fraction of 30% into 50ml of deionized water, then add 300mg of carbon nanotubes, heat and reflux at 60°C for 6h, wash and suction filter with deionized water, and freeze-dry the solid obtained by suction filtration to obtain Nitrogen-doped carbon nanotubes.

[0032] (2) Add 5.0g of lithium hydroxide, 30.0g of iron phosphate, 50.0g of oxalic acid, 5.0g of glucose, and 10.0g of deionized water into a three-necked flask, and then add 4.5g of cerium oxide to it. Heating to 90°C and keeping it for 5 hours, cooling down to room temperature, vacuum distillation to 80°C, taking out and drying, then adding ethanol to the material and ball milling for 3 hours, after drying, put the material in N 2 In a tubular muffle furnace under protection, calcined at 400°C for 5 hours, cooled to room temperature, took it out, then added ethanol and ball milled it for 6 hours, after drying, the material was placed in N2 Calcined at 700°C fo...

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Abstract

The invention discloses a nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite positive electrode material and a preparation method thereof, and is applied to the field of lithium ion batteries. The preparation method of the material comprises the following steps: mixing hydrazine hydrate and carbon nanotubes, and then carrying out reflux, suction filtration and freeze drying to prepare nitrogen-doped carbon nanotubes; preparing rare earth metal ion doped lithium iron phosphate by taking lithium hydroxide, ferric phosphate, oxalic acid, glucose and rare earth metal oxide as raw materials; and finally, adding the nitrogen-doped carbon nanotube and the rare earth metal ion-doped lithium iron phosphate into dispersion liquid for dispersion, and performing ball milling to obtain a final product. Compared with the traditional lithium iron phosphate, the nitrogen-doped carbon nanotube/rare earth metal ion-doped lithium iron phosphate composite positive electrode material prepared by the method has excellent rate charge-discharge performance.

Description

technical field [0001] The technical field of lithium ion batteries of the present invention specifically relates to a nitrogen-doped carbon nanotube / rare earth metal ion-doped lithium iron phosphate composite positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles and UPS power storage industries, the demand for lithium batteries has been greatly stimulated. Compared with traditional batteries, lithium-ion batteries charge faster, and their higher power density can achieve longer battery life; compared with ternary material batteries, they are safer. The cost and performance of lithium-ion batteries are mainly affected by their positive electrode materials. Therefore, olivine-type lithium iron phosphate with low cost, environmental protection, high specific energy, and high cycle characteristics has attracted much attention. At the same time, it has relatively high safety performance: it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168C01B25/45H01M4/58H01M4/62H01M10/0525
CPCC01B32/168C01B25/45H01M4/5825H01M4/625H01M10/0525C01P2004/80C01P2006/40Y02E60/10
Inventor 张恰恰王永志夏林悬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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