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Lithium iron phosphate/carbon nanocomposite and preparation method thereof

A technology of lithium iron phosphate and composite materials, which is applied in the field of lithium iron phosphate/carbon nanocomposites and carbon-coated lithium iron phosphate nanocomposites, which can solve the problems of high energy consumption, high cost, and long reaction time

Active Publication Date: 2014-02-26
江苏贝特瑞纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium iron phosphate material prepared by this method has good crystallinity and uniform particle size, but the hydrothermal method generally has long reaction time, large energy consumption, and high cost

Method used

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  • Lithium iron phosphate/carbon nanocomposite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First prepare the aqueous solution of sodium lauryl sulfate and add it to the reactor; then add the ferric nitrate and phosphoric acid aqueous solution with a concentration of 2.0mol / L to the reactor successively at a flow rate of 20ml / min, and put the reactor The temperature was raised to 40° C., and the reaction was stirred at 18 Hz for 8 hours. During the reaction, the pH of the solution was adjusted to 3.8 by adding ammonia water, and the nanoscale iron phosphate precursor was obtained after filtering and drying.

[0043] Mix the above-mentioned nanoscale iron phosphate and lithium hydroxide in deionized water at a molar ratio of 1.0:1.1; then place them in a closed reactor with a temperature of 70°C and a stirring speed of 80r / min, with a flow rate of 2L / min Sodium carbonate solution was passed through, the pH of the solution was adjusted to 8, and the deposition reaction was carried out for 4 hours; then the reacted substance was filtered and dried to obtain a nano...

Embodiment 2

[0046] First prepare polyethylene glycol aqueous solution and add it to the reactor; then add ferric chloride and ammonium dihydrogen phosphate aqueous solution with a concentration of 0.1mol / L to the reactor successively at a flow rate of 60ml / min. The temperature of the reactor was raised to 60° C., and the reaction was stirred at 45 Hz for 5 hours. During the reaction, the pH of the solution was adjusted to 6.5 by adding sodium hydroxide, and the nanoscale iron phosphate precursor was obtained after filtering and drying.

[0047] Mix the above-mentioned nanoscale ferric phosphate and lithium acetate in deionized water at a molar ratio of 1.0:1.0; then place them in a closed reactor with a temperature of 30°C and a stirring speed of 30r / min at a flow rate of 0.1L / min continuous CO 2 gas, adjust the pH of the solution to 7, and conduct a deposition reaction for 12 hours; then filter and dry the reacted substance to obtain a nanoscale lithium iron phosphate precursor.

[0048...

Embodiment 3

[0050] First prepare cetyltrimethylammonium bromide aqueous solution and add it to the reactor; then add the prepared ferric acetate and diammonium hydrogen phosphate aqueous solution with a concentration of 5mol / L to the reaction vessel at a flow rate of 1ml / min. In the reactor, the temperature of the reactor was raised to 25°C, and the reaction was stirred at a speed of 0.5 Hz for 15 hours. During the reaction, the pH of the solution was adjusted to 4 by adding potassium hydroxide, and after filtration and drying, the nanoscale iron phosphate precursor was obtained.

[0051] Mix the above-mentioned nanoscale ferric phosphate and lithium nitrate in deionized water at a molar ratio of 1.0:1.3; then place them in a closed reactor with a temperature of 100°C and a stirring speed of 80r / min, and continue at a flow rate of 10L / min. Potassium carbonate solution was passed through, the pH of the solution was adjusted to 10, and the deposition reaction was carried out for 1 hour; then...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate / carbon nanocomposite, which comprises the steps of preparing nanoscale iron phosphate; uniformly mixing the nanoscale iron phosphate with a lithium source, and introducing CO2 gas or adding soluble carbonate for a deposition reaction to obtain a nanoscale lithium iron phosphate precursor; performing chemical vapor deposition (CVD) coating on the lithium iron phosphate precursor to obtain a carbon-coated lithium iron phosphate material. According to the method provided by the invention, lithium is uniformly deposited on the surface of iron phosphate, and molecular-level uniform and consistent mixing can be realized; compared with a process of preparing lithium iron phosphate directly by a hydrothermal process, the reaction time is short, the energy consumption is low, and the process and appearance are easier to control; finally, carbon reduction and coating are performed by a CVD process, the coating effect is more uniform than that of the traditional carbon coating process, and the electric conductivity of lithium iron phosphate is improved perfectly.

Description

technical field [0001] The present invention relates to the field of positive electrode materials for lithium ion batteries. Specifically, the present invention relates to a lithium iron phosphate / carbon nanocomposite material, and the carbon-coated lithium iron phosphate nanocomposite material prepared by combining a liquid phase method and a chemical vapor deposition method Methods. Background technique [0002] With the consideration of factors such as the shortage of petroleum energy and the global climate and environment, countries attach great importance to the development of EV (electric vehicle) and HEV (hybrid electric vehicle). No matter EV or HEV, power battery has become a key technical bottleneck restricting its development. [0003] One of the key technologies for the development of lithium-ion power batteries is to prepare high-performance cathode battery materials. Lithium cobalt oxide, a cathode material commonly used at present, may lead to oxygen evoluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/122B82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 王张健席小兵杨顺毅黄友元任建国
Owner 江苏贝特瑞纳米科技有限公司
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