Electrode for inhibiting shuttle flying of polysulfide ions in lithium-sulfur battery and preparation and application thereof

A lithium-sulfur battery and electrode technology, which is applied in the field of lithium-sulfur battery electrodes and its preparation, can solve problems such as shuttles that are difficult to polysulfide, achieve the effects of improving cycle performance and Coulombic efficiency, suppressing shuttles, and improving utilization

Active Publication Date: 2020-06-02
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AI-Extracted Technical Summary

Problems solved by technology

However, the above-mentioned methods are usually difficult to meet the requirements of industrialization including low cost, mature process, and...
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Method used

By shown in Fig. 3, by using cyclic voltammetry to test the electrochemical performance of comparative example 1, comparative example 2 and embodiment 1 positive electrode material, due to deposition there is conduction and can effectively suppress the coating of polysulfide shuttle , Compared with Comparative Example 1, Example 1 exhibited a smaller electrochemical polarization, and compared with Comparative Example 2, the Example exhibited a larger electrochemical capacity. On the one hand, it shows that the effective deposition of Ni-P coating can greatly improve the conductivity of the electrode, thereby improving the utilization rate of active material sulfur and reducing polarization. On the basis of Ni-P coating, TiO2 nanometer Particles can further inhibit the diffusion of polysulfides to the negative electrode while ensuring good conductivity of the electrode, thereby increasing the battery capacity.
Fig. 6 has shown through depositing pure TiO2 comparative example 3 of coating and is deposited with Ni-P-TiO2 the discharge curve of embodiment 1 of chemical coating under different discharge rates, because although TiO2 can effectively chemisorption poly Sulfide, but because of its poor conductivity, the electrode is more polarized, especially at high rates, the discharge specific capacity is far behind that of Example 1. It is further illustrated that in Example 1, by depositing Ni and TiO2, the synergistic effect of improving the electrode conductivity and inhibiting the polysulfide shuttle can improve the electrochemical performance of the sulfur-carbon electrode, thereby realizing the preparation of a high specific energy lithium-sulfur battery .
Shown in Fig. 1, what a figure shows is not by th...
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The invention relates to an electrode for inhibiting shuttle flying of polysulfide ions in a lithium-sulfur battery and preparation and application thereof. According to the electrode, a composite metal-oxide composite coating capable of physically screening and chemically adsorbing polysulfide is deposited on a sulfur-carbon positive electrode material by applying a contact type chemical platingprocess, the current collecting effect of the electrode and the electron transmission efficiency in the electrode can be improved, the higher active substance utilization rate is achieved, the electrode polarization is reduced, the electrochemical capacity is improved, the shuttle flying effect of polysulfide can be well restrained, and the cycle life is prolonged. The sulfur-carbon electrode anda metal lithium negative electrode are assembled into a lithium-sulfur battery, so that the performance and the energy density of the battery can be greatly improved, and the sulfur-carbon electrode has huge potential of realizing industrial large-scale production in the future.

Application Domain

Cell electrodesLi-accumulators

Technology Topic

Electron transmissionChemical plating +11


  • Electrode for inhibiting shuttle flying of polysulfide ions in lithium-sulfur battery and preparation and application thereof
  • Electrode for inhibiting shuttle flying of polysulfide ions in lithium-sulfur battery and preparation and application thereof
  • Electrode for inhibiting shuttle flying of polysulfide ions in lithium-sulfur battery and preparation and application thereof


  • Experimental program(1)
  • Comparison scheme(3)
  • Effect test(1)

Example Embodiment

[0040] Example 1 (Ni-P-TiO deposited by electroless plating 2 Coated S/C positive electrode)


Thickness0.1 ~ 5.0µm
Thickness1.0 ~ 3.0mm
Particle size25.0 ~ 700.0nm

Description & Claims & Application Information

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