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Preparation method of lithium iron phosphate cathode material

A lithium iron phosphate, cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of uncontrollable distribution, reduce the specific capacity of the electrode and the tap density of the material, and improve the capacity and cycle. performance, improved electrical conductivity, and the effect of simple preparation process

Inactive Publication Date: 2017-07-04
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional coated carbons are amorphous carbons, and their morphology, especially the distribution, cannot be controlled. At the same time, the introduction of carbon sources as inactive substances will reduce the specific capacity of the electrode and the tap density of the material.

Method used

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  • Preparation method of lithium iron phosphate cathode material
  • Preparation method of lithium iron phosphate cathode material
  • Preparation method of lithium iron phosphate cathode material

Examples

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preparation example Construction

[0020] A method for preparing a lithium iron phosphate cathode material, comprising the steps of:

[0021] Step 1, weigh lithium carbonate, ammonium dihydrogen phosphate, ferrous oxalate respectively according to the ratio of stoichiometric ratio 1:1:1, add dehydrated alcohol (dehydrated alcohol and lithium carbonate, ammonium dihydrogen phosphate, ferrous oxalate raw material The volume ratio is 1.5:1~2.2:1), after mixing evenly, perform ball milling at 350~450rpm for 6~10 hours, and then vacuum dry at 60~100°C for 10~20 hours to obtain lithium iron phosphate precursor powder;

[0022] Step 2. Keep the lithium iron phosphate precursor prepared in step 1 in a tube furnace protected by a pure nitrogen atmosphere at 350-450°C for 4-6 hours, continue to heat up to 600-800°C for 6-10 hours, and then cool naturally to Obtain lithium iron phosphate cathode material at room temperature;

[0023] Step 3. Weigh 1wt.% to 3wt.% copper flakes of the lithium iron phosphate mass obtained i...

Embodiment 1

[0025] Step 1. Weigh 0.05mol of lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate, add 30mL of absolute ethanol and mix evenly, then ball mill at 400rpm / min for 6h, and dry in a vacuum oven at 80°C for 12h after ball milling to obtain lithium iron phosphate Precursor powder;

[0026] Step 2. Place the lithium iron phosphate precursor powder in a tube furnace protected by a pure nitrogen atmosphere, raise the temperature to 350°C at a heating rate of 5°C / min, keep it for 4 hours, and then raise the temperature to 650°C at a rate of 5°C / min. Keeping the temperature for 10 hours, and cooling naturally to room temperature to obtain the lithium iron phosphate positive electrode material.

[0027] Step 3. Weigh 0.11g of copper flakes and 1.1g of sucrose and add them to the prepared lithium iron phosphate cathode material, ball mill for 1 hour to mix the materials evenly; then wash with absolute ethanol for 3 times and centrifuge, and dry at 50°C for 10 hours; Dr...

Embodiment 2

[0030] Step 1. Weigh 0.05mol of lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate, add 30mL of absolute ethanol and mix evenly, then ball mill at 400rpm / min for 8h, and dry in a vacuum oven at 80°C for 12h after ball milling to obtain lithium iron phosphate Precursor powder;

[0031] Step 2. Place the lithium iron phosphate precursor powder in a tube furnace protected by a pure nitrogen atmosphere, raise the temperature to 350°C at a heating rate of 5°C / min, keep it for 4 hours, and then raise the temperature to 650°C at a rate of 5°C / min. Keeping the temperature for 10 hours, and cooling naturally to room temperature to obtain the lithium iron phosphate positive electrode material.

[0032] Step 3. Weigh 0.22g of copper flakes and 1.1g of sucrose and add them to the prepared lithium iron phosphate cathode material, ball mill for 2 hours to mix the materials evenly; then wash with absolute ethanol for 3 times and centrifuge, and dry at 50°C for 10 hours; D...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate cathode material. The preparation method comprises the following steps: step one, weighing lithium carbonate, ammonium dihydrogen phosphate and ferrous oxalate respectively in a stoichiometric proportion of 1: 1: 1, adding absolute ethyl alcohol, uniformly mixing, carrying out ball-milling for 6 to 10 h at 350 to 450 rpm, then carrying out vacuum drying at the temperature of 60 to 100 DEG C for 10 to 20 h so as to obtain lithium iron phosphate precursor powder; step two, carrying out heat preservation for 4 to 6 h at the temperature of 350 to 450 DEG C in a pure nitrogen atmosphere protective tube furnace on the lithium iron phosphate precursor obtained in the step one, continuing temperature rise to 600 to 800 DEG C, calcining for 6 to 10 h, and naturally cooling to room temperature to obtain a lithium iron phosphate cathode material; and step three, weighing 1 wt% to 3 wt% of copper sheets with the mass being that of the lithium iron phosphate obtained in the step one and 4 wt% to 10 wt% of saccharose with the mass being that of the lithium iron phosphate obtained in the step one into the lithium iron phosphate material obtained in the step two, carrying out ball-milling for 1 to 3 h, washing with ethyl alcohol, centrifuging and drying, and calcining for 1 to 3 h at the temperature of 600 to 800 DEG C in a pure nitrogen atmosphere so as to obtain the lithium iron phosphate cathode material coated with copper and carbon together.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a lithium iron phosphate cathode material. [0003] 【Background technique】 [0004] The rapid development of the automobile industry has promoted the progress and development of global machinery, energy, transportation and other industries. However, while fuel vehicles benefit mankind, their exhaust emissions have also caused serious pollution to the human living environment. The requirements of environmental protection and energy shortage have driven the development of electric vehicles (EV) and power batteries. At present, the main problems of electric vehicles are price, mileage, power performance, etc., and these problems are closely related to battery technology. The research and development of battery technology and battery materials will play a decisive role in its development. Energy, cheap, safe and reliable cathode materials are...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 刘晓艳杨斌斌钱龙饶睦敏
Owner OPTIMUM BATTERY CO LTD
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