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Method for preparing sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material

A composite positive electrode material, lithium ferrous silicate technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of low electronic conductivity and poor diffusion performance, and achieve uniform particle distribution, high rate performance, excellent Effect of rate performance and cycle performance

Inactive Publication Date: 2016-03-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to improve Li 2 FeSiO 4 Low electronic conductivity, poor diffusion performance, etc., the present invention proposes a method for preparing sodium-doped lithium ferrous silicate / carbon nanostructure composite positive electrode material, in order to improve its specific capacity under high rate conditions

Method used

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  • Method for preparing sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material
  • Method for preparing sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material
  • Method for preparing sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material

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Experimental program
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Effect test

Embodiment 1

[0019] Li 2 FeSiO 4 / C composite cathode material preparation

[0020] Weigh 0.052 mol of citric acid and 0.08 mol of lithium hydroxide into 500 ml of water, stir and dissolve with magnetic force; add 0.04 mol of ferrous oxalate, adjust the pH of the solution to 7-8, keep warm in an oil bath at 90°C for 24 hours, and form a dark green solution; add 0.04mol nano-silica, ultrasonic 20min, stirring at 25°C for 1h to obtain a sol; the sol was spray-dried at 108°C to obtain a lithium ferrous silicate / carbon composite precursor; the lithium ferrous silicate / carbon composite precursor The body was heat-treated at 700 °C for 10 h in an argon atmosphere. Through elemental analysis test, the obtained Li 2 FeSiO 4 The carbon content in the / C composite cathode material is about 16.7%. X-ray diffraction pattern see figure 1 , scanning electron microscope image see figure 2 , image 3 .

Embodiment 2

[0022] Li 1.99 Na 0.01 FeSiO 4 / C composite cathode material preparation

[0023] Weigh 0.052 mol of citric acid, 0.0796 mol of lithium hydroxide and 0.004 mol of sodium hydroxide into 500 ml of water, stir and dissolve with magnetic force; add 0.04 mol of ferrous oxalate, adjust the pH of the solution to 7-8, and keep it in an oil bath at 90°C for 24 hours, Form a dark green solution; add 0.04mol nano-silica, ultrasonic 20min, and stir at 25°C for 1h to obtain a sol; spray dry the sol at 108°C to obtain a lithium ferrous silicate / carbon composite precursor; The iron-lithium / carbon composite precursor was heat-treated at 700 °C for 10 h in an argon atmosphere.

Embodiment 3

[0025] Li 1.97 Na 0.03 FeSiO 4 / C composite cathode material preparation

[0026] Weigh 0.052 mol of citric acid, 0.0788 mol of lithium hydroxide and 0.012 mol of sodium hydroxide into 500 ml of water, stir and dissolve with magnetic force; add 0.04 mol of ferrous oxalate to adjust the pH of the solution to 7-8, and keep it warm in an oil bath at 90°C for 24 hours. Form a dark green solution; add 0.04mol nano-silica, ultrasonic 20min, and stir at 25°C for 1h to obtain a sol; spray dry the sol at 108°C to obtain a lithium ferrous silicate / carbon composite precursor; The iron-lithium / carbon composite precursor was heat-treated at 700 °C for 10 h in an argon atmosphere.

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Abstract

The invention relates to the technical field of lithium ion battery manufacturing, and especially a method for preparing a sodium-doped lithium ferrous silicate / carbon nano-micro structure composite cathode material. The method comprises the following steps: adding citric acid, lithium hydroxide, sodium hydroxide and ferrous oxalate into water, stirring and dissolving, performing oil bath and forming a deep green solution; and adding nanosilicon dioxide to obtain a sol, spray drying to obtain a precursor of the sodium-doped lithium ferrous silicate / carbon nano-micro structure composite cathode material, and calcinating in argon to obtain the sodium-doped lithium ferrous silicate / carbon nano-micro structure composite cathode material. The method for preparing the sodium-doped lithium ferrous silicate / carbon nano-micro structure composite cathode material provided by the invention is simple and safe in process, low in cost, and the obtained sodium-doped lithium ferrous silicate / carbon nano-micro structure composite cathode material is uniform in particle distribution and excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a method for preparing sodium-doped lithium ferrous silicate / carbon nanostructure composite cathode materials. Background technique [0002] With the decreasing of non-renewable energy such as oil, coal and natural gas, and the deteriorating problems of greenhouse effect and environmental pollution caused by their use, the development of new energy mainly based on renewable energy and the development of low-carbon economy are the solution to these two problems. important path to the problem. At present, countries all over the world are striving to develop and utilize green and environmentally friendly renewable energy, such as water energy, wind energy, solar energy, biomass energy, etc., and realize the effective conversion and storage of energy. Among many energy storage batteries, lithium-ion batteries have been widely used in portable appliances (...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 任玉荣卢鹏丁建宁黄小兵
Owner CHANGZHOU UNIV
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