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Preparation method of anode active material lithium iron phosphate of lithium battery

A cathode active material, lithium iron phosphate technology, used in battery electrodes, circuits, electrical components, etc., can solve the problem that the performance is difficult to meet the requirements of high-power power batteries, and achieve fine grains, improved conductivity, and controllable composition. Effect

Inactive Publication Date: 2012-08-29
SICHUAN KENENG LITHIUM BATTERY
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  • Description
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AI Technical Summary

Problems solved by technology

However, its essence still belongs to the category of solid-phase method, and its product performance is difficult to meet the requirements of high-power power batteries.

Method used

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  • Preparation method of anode active material lithium iron phosphate of lithium battery
  • Preparation method of anode active material lithium iron phosphate of lithium battery
  • Preparation method of anode active material lithium iron phosphate of lithium battery

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preparation example Construction

[0029] A method for preparing lithium iron phosphate, a cathode active material for lithium batteries, the steps of the preparation process comprising:

[0030] 1. Prepare lithium source, iron source and phosphorus source according to the molar ratio of 1~1.2 : 1 : 1 to make a solution, and control the total concentration of metal ions in the solution at 0.5~2mol / L.

[0031] 2. Spray-dry the solution at a temperature of 90-350°C to form powder.

[0032] 3. Calcining the obtained powder at a temperature of 400-750° C. for 3-12 hours in a protective atmosphere.

[0033] 4. Rapid cooling to room temperature in the same atmosphere can obtain pure olivine-type lithium iron phosphate or metal ion-doped lithium iron phosphate or a powder material composited with carbon. These materials can be used as large Positive electrode active material for power secondary lithium battery.

[0034] The lithium source mentioned above can be one or more of lithium salts such as lithium carbonate,...

Embodiment 1

[0039] Lithium-ion battery cathode material LIFePO4 preparation method

[0040] 1. Fe(NO3) 3 .9H 2 O 82.45 g (analytical pure, content ≥ 98.5), Li 2 CO 3 7.46g (analytical pure, content ≥ 99), H 3 PO 4 23.06g (analytically pure, content ≥ 85) (Li:Fe:P=1:1:1), weighed with a 500g electronic balance (accuracy 0.01g), put it into a 500ml glass beaker, add 200ml deionized water, stir until completely dissolved.

[0041] 2. Preheat the spray dryer to an outlet temperature of 100°C.

[0042] 3. Put the above-mentioned prepared solution into the nozzle for atomization and drying. 38 g of a pale yellow powder are obtained.

[0043] 4. Put the above powder into a ceramic crucible, put it into a tubular resistance furnace, and then pass in nitrogen gas containing 5% hydrogen. After 20 minutes, turn on the electricity and raise the temperature.

[0044] 5. After the heat preservation is over, cool it down to room temperature (the whole process keeps flowing nitrogen with ...

Embodiment 2

[0047] Lithium-ion battery cathode material LIFePO4 / C composite powder preparation method

[0048] 1. Fe(NO3) 3 .9H 2 O 164.9 g, Li 2 CO 3 15.66g, H 3 PO 4 23.06g (Li:Fe:P=1.05:1:1), weighed with a 500g electronic balance (precision 0.01g), put it into a 500ml glass beaker, add 400ml of deionized water, and stir until completely dissolved.

[0049] 2. Add 5g of pre-dissolved polyethylene glycol 6000 and stir evenly.

[0050] 3. The spray dryer is preheated to an outlet temperature of 120°C, and the above-mentioned prepared solution is added to the nozzle for atomization and drying. 82 g of light mud yellow powder were obtained.

[0051] 4. Put the above powder into a ceramic crucible, put it into a tubular resistance furnace, and then pass in nitrogen gas containing 5% hydrogen. After 20 minutes, turn on the electricity and raise the temperature, and keep the temperature for 9 hours after the temperature rises to 600°C.

[0052] 5. After the heat preservation is ...

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Abstract

The invention discloses a preparation method of an anode active material lithium iron phosphate of a lithium battery and relates to a method for preparing an anode active material lithium iron phosphate of a secondary lithium battery by a solution-spray drying-roasting method. The preparation method is characterized in that an iron salt, a lithium salt and a phosphoric acid which are soluble, and a metal source and a carbon source precursor which are selectively added are taken as raw materials in the preparation process and the preparation process comprises the following steps of: preparing the raw materials into a mixed solution; carrying out spray drying on the mixed solution to obtain powder; and then carrying out roasting under protective atmosphere, thus preparing the anode active material lithium iron phosphate of the lithium battery. By virtue of the preparation method, high-property lithium iron phosphate powder with controllable and uniform components and fine crystal grains can be obtained, and the lithium iron phosphate powder can serve as the high-quality anode active material of the secondary lithium battery. The preparation method is available for production in batches.

Description

technical field [0001] The invention discloses a preparation method of lithium iron phosphate, a positive electrode active material of a lithium battery, and relates to a method for preparing lithium iron phosphate, a positive electrode active material of a lithium ion secondary battery, by adopting a solution spray drying-roasting method. Background technique [0002] Research and development of new energy is an important basis for the sustainable development of human society. With the development of human society, people's demand for efficient, environmentally friendly and economical new energy is becoming stronger and stronger. Most new energy sources (such as solar energy, wind energy, etc.) need to be equipped with large-scale energy storage batteries due to their interstitial nature. Electric vehicles require high-power power batteries. These needs strongly promote the development of power batteries with high energy density, high safety, environmental protection and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 岳波张继忠
Owner SICHUAN KENENG LITHIUM BATTERY
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