Spherical nitrogen-doped carbon/titanium oxide double-shell coated titanium oxide/sulfur lithium-sulfur battery positive electrode material and preparation method thereof

A titanium oxide, nitrogen-doped carbon technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of ignoring the requirements of high coulomb efficiency, consumption, battery capacity attenuation, etc., to prevent concentration diffusion loss , the effect of improving Coulomb efficiency and preventing diffusion loss

Active Publication Date: 2018-07-27
深圳启辰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application of these carbon materials and oxide materials has improved some aspects of the performance of sulfur cathode composite materials, such as specific capacity, rate performance, cycle performance, etc., but often ignores the requirement for high Coulombic efficiency, and Coulombic efficiency as a The industrial production of lithium-sulfur batteries is particularly important because the low coulombic efficiency will quickly consume lithium salts in the electrolyte, resulting in a rapid decline in battery capacity

Method used

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  • Spherical nitrogen-doped carbon/titanium oxide double-shell coated titanium oxide/sulfur lithium-sulfur battery positive electrode material and preparation method thereof
  • Spherical nitrogen-doped carbon/titanium oxide double-shell coated titanium oxide/sulfur lithium-sulfur battery positive electrode material and preparation method thereof
  • Spherical nitrogen-doped carbon/titanium oxide double-shell coated titanium oxide/sulfur lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Dispense 100 mg of SiO with a diameter of 280 nm 2 microspheres (see figure 1 ) was dispersed in 28 milliliters of organic solution (ethanol: acetonitrile is 3:1), and the concentration of 0.2 milliliters was added dropwise to 28% ammonia water and stirred for 60 minutes, then slowly added 4.4 milliliters of organic solution containing 10% TBOT (ethanol: Acetonitrile=3:1), stirred for 2 hours, and after washing with ethanol centrifugation, the obtained TiO 2 coated SiO 2 The microsphere product is put into a muffle furnace for calcination, the calcination temperature is 200 degrees, and the calcination time is 4 hours to obtain crystalline TiO with a diameter of 340 nanometers. 2 Coated SiO 2 microsphere product (see figure 2 ).

[0036] The second step: the crystalline TiO obtained in the first step 2 @SiO 2 The complex was dispersed into 100 ml of dopamine hydrochloride aqueous solution with a concentration of 1% and stirred for 4 hours, filtered and w...

Embodiment 2

[0041] Step 1: Dispense 100 mg of SiO with a diameter of 600 nm 2 The microspheres were dispersed in 28 ml of organic solution (ethanol: acetonitrile was 3:1), and 0.2 ml of 28% ammonia water was added dropwise and stirred for 60 minutes, then slowly added 4.4 ml of organic solution containing 15% TBOT (ethanol : acetonitrile=3:1), stirred for 2 hours, and after washing with ethanol centrifugation, the obtained TiO 2 coated SiO 2 The microsphere product is put into a muffle furnace for calcination, the calcination temperature is 400 degrees, and the calcination time is 4 hours to obtain crystalline TiO with a diameter of 680 nm. 2 Coated SiO 2 microsphere product.

[0042] The second step: basically the same as in Example 1, the obtained product was dispersed into 200 ml of dopamine hydrochloride aqueous solution with a concentration of 2% and stirred for 4 hours, then filtered, washed and dried with deionized water.

[0043] The third step: basically the same as in Exampl...

Embodiment 3

[0047] The first step: basically the same as in Example 1, add 4.4 ml of organic solution (ethanol: acetonitrile=3:1) containing 20% ​​TBOT to obtain a crystalline TiO with a diameter of 360 nanometers 2 Coated SiO 2 microsphere product.

[0048] The second step: basically the same as in Example 1, the obtained product was dispersed into 200 ml of dopamine hydrochloride aqueous solution with a concentration of 2% and stirred for 6 hours, then filtered, washed and dried with deionized water.

[0049] The third step: basically the same as in Example 1, the composite material is put into a tube furnace with a nitrogen-hydrogen mixture (nitrogen: hydrogen is 3:1), and the flow rate of the mixture is 60 ml / min. The temperature was raised to 1050 degrees at a rate of 5 degrees per minute, and the temperature was kept constant for 6 hours to obtain a spherical structure of NC / Ti with a diameter of 410 nanometers 4 o 7 Double shell coated Ti 4 o 7 Composite materials of nanoparti...

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Abstract

Disclosed is a spherical-structure N-doped carbon / titanium oxide dual-shell coated titanium oxide / sulfur lithium sulfur battery positive electrode material. An NC external spherical shell coats a Ti4O7 internal spherical shell, and Ti4O7 nanoparticles (3) and nanometer sulfur (4) are contained in the internal spherical shell. A preparation method comprises the steps of S1, dispersing SiO2 microspheres in an organic solution for liquid-phase coating, and placing the obtained product in a muffle furnace for calcination after normal filtering and cleaning; S2, performing liquid-phase nitrogen-containing monomer polymerization and coating on the obtained product, and performing normal filtering, cleaning and vacuum drying; S3, performing high-temperature carbonization and reduction processing on the obtained product, dispersing the obtained product in an alkali solution for etching, performing ultrasonic processing, and performing vacuum drying after normal filtering and cleaning to obtain a composite material; and S4, dispersing the obtained product in an aqueous solution containing a sulfur salt, dropwise adding a weak acid solution, performing stirring, placing the product in a closed container inflated with inert gas after normal filtering, cleaning and vacuum drying, and obtaining the composite material after slowly rising a temperature and keeping a constant temperature.

Description

technical field [0001] The invention relates to the technical field of battery cathode materials, in particular to a lithium-sulfur battery cathode material with a spherical structure of nitrogen-doped carbon / titanium oxide double-shell coated titanium oxide / sulfur, wherein the titanium oxide is Ti 4 o 7 , Nitrogen-doped carbon is NC, (hereinafter referred to as NC). The invention also relates to a preparation method of the lithium-sulfur battery cathode material of the spherical structure nitrogen-doped carbon / titanium oxide double-shell coated titanium oxide / sulfur. Background technique [0002] With the rapid development of related fields such as mobile communications, portable electronic devices, electric vehicles, and energy storage devices, higher and higher requirements are placed on battery performance, especially specific capacity, energy density, cycle life, and rate. Therefore, it is of great strategic significance to develop new lithium-ion secondary batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 徐辉覃旭松苏景扬杨跃彬陈国华
Owner 深圳启辰新能源科技有限公司
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