Three-dimensional ordered porous sulfur-carrying material for positive pole piece of lithium-sulfur battery as well as preparation method and application of three-dimensional ordered porous sulfur-carrying material

A three-dimensional ordered, lithium-sulfur battery technology, applied in the field of electrochemical energy storage, can solve the problems of slow electrochemical reaction kinetics, low sulfur utilization rate, inability to lithium-sulfur batteries, etc., achieves low preparation cost, improved adsorption, The effect of large-scale commercial application

Pending Publication Date: 2020-07-03
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are still many problems in the practical application of lithium-sulfur batteries: First, the low conductivity of sulfur makes it difficult for electrons to conduct to sulfur to participate in the electrochemical reaction discharge.
This complex phase transition process will make the kinetics of the entire electrochemical reaction very slow, making the overall lithium-sulfur battery unable to operate at high currents, and will also lead to a decrease in the utilization rate of sulfur.

Method used

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  • Three-dimensional ordered porous sulfur-carrying material for positive pole piece of lithium-sulfur battery as well as preparation method and application of three-dimensional ordered porous sulfur-carrying material
  • Three-dimensional ordered porous sulfur-carrying material for positive pole piece of lithium-sulfur battery as well as preparation method and application of three-dimensional ordered porous sulfur-carrying material
  • Three-dimensional ordered porous sulfur-carrying material for positive pole piece of lithium-sulfur battery as well as preparation method and application of three-dimensional ordered porous sulfur-carrying material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this example, the specific preparation process of the three-dimensional ordered porous sulfur-carrying material is as follows:

[0050] (1) Preparation of polystyrene nanoparticles:

[0051] Take 70mL styrene solution, wash it once with 25mL 10wt.% sodium hydroxide solution to remove the stabilizer in the styrene solution, then wash the styrene solution three times with deionized water and collect it for later use.

[0052] Take 65 mL of the above-mentioned cleaned styrene solution and add it into 500 mL of deionized water to obtain a mixed solution. Add 2.5 g of polyvinylpyrrolidone to the mixed solution, stir and dissolve it thoroughly, and then continuously blow nitrogen into the above solution for 30 minutes at room temperature to remove oxygen in the liquid. After that, the temperature of the above solution was raised to 75° C. under airtight and nitrogen or argon protection. After the temperature was stabilized, 50 mL of a solution containing 1 g of potassium...

Embodiment 2

[0064] In this example, the preparation process of the lithium-sulfur battery positive pole piece is as follows:

[0065] (1) The preparation method of carbon-sulfur complex, comprises the steps:

[0066] Take 0.1 g of the prepared three-dimensional ordered porous sulfur-carrying material and grind it fully with 0.3 g of sublimed sulfur in a mortar to obtain a uniform powder. The mixed solid powder was placed in an airtight container protected by argon, the temperature was raised to 155° C., and kept at this temperature for 12 hours. The resulting mixed powder is taken out as a carbon-sulfur compound.

[0067] (2) The preparation method of lithium-sulfur battery positive electrode slurry comprises the following steps:

[0068] Take 800mg of the carbon-sulfur complex obtained in (1) and place it in a glass bottle, add 100mg of conductive agent and 100mg of adhesive, add 3mL of N-methylpyrrolidone, stir thoroughly for 5 hours and sonicate to obtain a uniform suspension that is...

Embodiment 3

[0074] In this embodiment, the electrochemical test of the carbon-sulfur composite obtained after directly mixing the sublimated sulfur with the conductive agent as the positive electrode sheet includes the following steps:

[0075] (1) Preparation of carbon-sulfur complex

[0076] Take 100mg of Ketjen Black and 350mg of sublimated sulfur in a mortar, grind them thoroughly and add them into an airtight container protected by argon. The container was heated to 155°C and kept at this temperature for 12 hours to obtain a carbon-sulfur complex of Ketjen black and sublimated sulfur.

[0077] (2) Preparation of cathode slurry for lithium-sulfur battery

[0078] Take 800mg of the carbon-sulfur complex obtained in (1) in a glass bottle, add 100mg of conductive agent and 100mg of adhesive, add 3mL of N-methylpyrrolidone, stir thoroughly for 5 hours and sonicate to obtain a uniform suspension that is lithium Sulfur battery cathode slurry. Wherein, the conductive agent can be Ketjen b...

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Abstract

The invention relates to the field of electrochemical energy storage, in particular to a three-dimensional ordered porous sulfur-carrying material for a positive pole piece of a lithium-sulfur batteryas well as a preparation method and application of the three-dimensional ordered porous sulfur-carrying material. A template method and a solvent induction method are combined, so that macropores areuniformly and orderly distributed in the positive electrode sulfur-carrying material, and the ordered macropores are connected by a framework containing rich micropore and mesoporous structures. Moreover, in the porous conductive framework, polar site zinc sulfide and monatomic active site Co-N-C are widely distributed to fix a polysulfide intermediate product generated in an electrochemical reaction process, so that the problem of rapid capacity attenuation caused by a shuttle effect is weakened. According to the three-dimensional ordered porous sulfur-carrying material disclosed by the invention, the positive pole piece of the lithium-sulfur battery can stably operate under high sulfur content and high current, so that the possibility of large-scale commercial application of the lithium-sulfur battery is effectively promoted, and a solid foundation is laid for realizing that the next generation of high-energy density battery is used for mobile electronic equipment and electric vehicles.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a three-dimensional ordered porous sulfur-carrying material used for the positive electrode sheet of a lithium-sulfur battery, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development and popularization of various electronic products and electric vehicles, people's demand for batteries with high energy density is becoming more and more urgent. However, traditional Li-ion batteries based on Li-ion intercalation and deintercalation to achieve electrochemical energy storage have approached the limit of their energy density. In order to develop a new type of next-generation battery with small size, light weight and large capacity, it is necessary to develop new electrode materials and new electrochemical energy storage systems. [0003] Lithium-sulfur batteries use metal lithium sheets as the negative electr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M4/139H01M4/04H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M4/13H01M4/139H01M4/0404H01M10/052Y02E60/10
Inventor 赵天寿赵琛巫茂春
Owner THE HONG KONG UNIV OF SCI & TECH
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