Preparation method of positive electrode material of lithium-sulfur battery, and lithium-sulfur battery

A lithium-sulfur battery and positive electrode material technology, applied in the field of energy storage, can solve the problems of lithium-sulfur battery coulombic efficiency drop, low active material utilization rate, poor cycle performance, etc., to achieve the suppression of shuttle effect, increase battery capacity, and long cycle life Effect

Active Publication Date: 2018-09-28
武汉新能源研究院有限公司
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Problems solved by technology

[0003] Although compared with traditional lithium-ion batteries, lithium-sulfur batteries have obvious advantages as mentioned above, but there are still problems such as low utilization of active materials, poor cycle performance, low Coulombic efficiency, and high self-discharge rate, which delays the pace of its practical application.
Li dissolved in organic electrolyte 2 S n (4≤n≤8) In the presence of a concentration gradient, it has been electrochemically

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  • Preparation method of positive electrode material of lithium-sulfur battery, and lithium-sulfur battery
  • Preparation method of positive electrode material of lithium-sulfur battery, and lithium-sulfur battery
  • Preparation method of positive electrode material of lithium-sulfur battery, and lithium-sulfur battery

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Embodiment Construction

[0033] The principles and features of the present invention are described below, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0034] A kind of preparation method of positive electrode material for lithium-sulfur battery, specific process is as follows figure 1 As shown, it mainly involves four key steps of organic framework molecular construction, metal complexation, element doping and nanotube growth. The specific details are as follows:

[0035] S100. Dissolve cobalt nitrate and 2-methylimidazole in methanol at a ratio of 1:4, and let it stand for 6h-12h, and after centrifugation, dry it in a vacuum drying oven at 60°C-80°C for 12h, wherein , the drying standard is to remove methanol and a small amount of water to obtain ZIF-67; scanning electron microscopy results figure 2 As shown, its crystal structure is a cube.

[0036] S200, carbonizing ZIF-67 at 700°C-900°C at a heating r...

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Abstract

The invention relates to a preparation method of a positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of enabling cobalt nitrate and 2-methylimidazole to be dissolved into a solvent and performing standing, centrifuging and drying to obtain ZIF-67; performing carbonization on ZIF-67 in inert atmosphere and performing cooling to the room temperature to obtain Co-N-C; and performing carbonization on Co-N-C and dicyandiamide in the inert atmosphere, and performing cooling to the room temperature to obtain CNT@ Co-N-C. The lithium-sulfur battery comprises the positive electrode material used for the lithium-sulfur battery. Beneficial effects are achieved as follows: compared with the single metal organic framework compound-based composite material, the specific surface area and the conductivity of the positive electrode material disclosed in the invention are enlarged and improved, and sulfur load can be realized more effectively;in addition, a shuttle effect of polysulfide in the battery reaction process can be suppressed more effectively; and a constant-current discharge test on the assembled battery proves that the electrochemical performance of the composite material with the carbon nanotubes in an in-situ growth manner is more excellent.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a preparation method of a cathode material for a lithium-sulfur battery and the lithium-sulfur battery. Background technique [0002] With the successful commercial application of graphite anodes, lithium-ion batteries have been widely used in portable electronic devices such as smartphones and laptops. After more than 20 years of development, the existing lithium-ion batteries based on lithium-intercalated compound cathodes are close to their theoretical capacity, but they still cannot meet the requirements of the rapidly developing electronics industry and emerging electric vehicles. Looking for batteries with higher energy density The system is imminent. For example, a lithium-sulfur battery is a new generation of lithium-ion secondary battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode active material. Among them, metal ...

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/583H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 曹元成程时杰
Owner 武汉新能源研究院有限公司
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