Preparation method of nano-fibrous lithium cobalt phosphate positive electrode material

A lithium cobalt phosphate, cathode material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor electronic conductivity and harsh synthesis conditions, and achieve improved conductivity and preparation technology. Simple and controllable effects

Inactive Publication Date: 2014-07-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor ion and electronic conductivity and harsh synthesis conditions of the existing lithium cobalt phosphate lithium cathode material for lithium ion batteries, to improve the electrochemical performance of lithium cobalt phosphate lithium cathode materials for lithium ion batteries, and to provide a nanofiber Preparation method of lithium cobalt phosphate cathode material

Method used

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  • Preparation method of nano-fibrous lithium cobalt phosphate positive electrode material
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  • Preparation method of nano-fibrous lithium cobalt phosphate positive electrode material

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Effect test

Embodiment 1

[0023] A preparation method of a nanofibrous lithium cobalt phosphate positive electrode material, the specific steps are:

[0024] 1) First, dissolve 8mmol of lithium hydroxide and phosphoric acid in 12ml of deionized water to generate a lithium dihydrogen phosphate solution, then add 1g of polyvinylpyrrolidone (molecular weight: 1.3 million) and stir well, then let the solution stand until it becomes clear;

[0025] 2) Electrospin the obtained product, the positive high voltage is 30kv, the receiving end uses aluminum foil, and the negative high voltage is -5kv. The scanning electron microscope morphology of the collected spinning products is as follows: figure 1 shown.

[0026] 3) Calcinate the above spinning product in an argon atmosphere, the calcination temperature is 750°C, the heating rate is 5°C / min, and the reaction time is 12h; after the reaction is completed, the temperature of the material is cooled to room temperature, and the product is taken out to obtain nano...

Embodiment 2

[0030] 1) First, dissolve 12mmol of lithium dihydrogen phosphate and cobalt nitrate in 10ml of deionized water, then add 600mg of polyvinylpyrrolidone (molecular weight: 1.3 million) and stir well, then let the solution stand until it becomes clear;

[0031] 2) Electrospin the obtained solution, the positive high voltage is 10kv, the receiving end uses aluminum foil, and the negative high voltage is -10kv.

[0032] 3) Calcinate the above spinning product in an argon atmosphere, the calcination temperature is 650°C, the heating rate is 2°C / min, and the reaction time is 6h; after the reaction is completed, the temperature of the material is cooled to room temperature, and the product is taken out to obtain nanofibers with Morphology of lithium cobalt phosphate cathode material, and its electrochemical test.

[0033] The obtained lithium cobalt phosphate positive electrode material is subjected to X-ray diffraction test, and the obtained diffraction pattern is compared with the s...

Embodiment 3

[0036] 1) First, dissolve 6mmol of lithium dihydrogen phosphate and cobalt nitrate in 10ml of deionized water, then add 800mg of polyvinyl alcohol and stir until dissolved, then let the solution stand until it becomes clear;

[0037] 2) The obtained solution is subjected to electrospinning, the positive high voltage is 15kv, the receiving end is made of aluminum foil, and the negative high voltage is 0kv.

[0038] 3) Calcinate the above spinning product under a nitrogen atmosphere, the calcination temperature is 700°C, the heating rate is 2°C / min, and the reaction time is 8h; after the reaction is completed, the material temperature is cooled to room temperature, and the product is taken out to obtain a The appearance of lithium cobalt phosphate cathode material, and its electrochemical test.

[0039] The obtained lithium cobalt phosphate positive electrode material is subjected to X-ray diffraction test, and the obtained diffraction pattern is compared with the standard spect...

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Abstract

The invention relates to a preparation method of a nano-fibrous lithium cobalt phosphate positive electrode material, and belongs to the technical field of chemical industry electrode material preparation technologies. The preparation method comprises the following steps: dissolving cobalt salt, lithium salt, phosphate and a high-molecular polymer in deionized water, uniformly stirring the obtained solution, and allowing the solution to stand until the solution is clear; carrying out electrostatic spinning; and calcining the obtained spinning products in inert atmosphere, cooling the obtained material to room temperature after the calcining reaction, and removing the obtained products to obtain the lithium cobalt phosphate positive electrode materials with a nano-fibrous morphology. The method has the advantages of simplicity, easy operation, and strong controllability of preparation parameters; the obtained product has a nano-fibrous morphology, so the contact of the positive electrode material with an electrolyte contact is increased, and it is in favor of the transmission of lithium ions; and the positive electrode material and carbon form a composite structure, so the conductivity of the positive electrode material is improved, and the positive electrode material has a good electrochemical performance, and is expected to become a high-voltage positive electrode material.

Description

technical field [0001] The invention relates to a preparation method of a nanofibrous lithium cobalt phosphate positive electrode material, belonging to the technical field of chemical electrode material manufacturing technology. Background technique [0002] Since the successful development of lithium-ion batteries in the early 1990s, they have attracted much attention for their unique advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, and no pollution. It is widely used in small portable electronic products such as mobile phones, digital cameras, and notebook computers. In recent years, in response to the negative impacts such as environmental pollution and sharp consumption of oil resources brought about by the rapid development of the automobile industry, the United States, Japan, China and other countries are actively developing electric vehicles EV and hybrid vehicles HEV using cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M10/0525Y02E60/10
Inventor 穆道斌许洪亮石丽丽任永欢吴涵锋鲍澄宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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