CHEMICAL SCIENCE

Professor Li Xianglin of Washington University in St. Louis: Binder-free lithium-oxygen battery cathode!


February 24, 2023, Washington University in St. LouisProfessor Li XianglinThe team hosted a new journal at Tsinghua UniversityNano Research EnergyPublished the latest research results entitled “Binder-Free Li-O2 Battery Cathodes Using Ni- and PtRu-Coated Vertically Aligned Carbon Nanofibers as Electrocatalysts for Enhanced Stability”.

Cathode electrode materials for lithium-oxygen batteries need to be realized for batteriesHigh discharge capacity, strong stabilityandLong battery lifeThe research and development of materials has been facing great challenges. At present, unnecessary intermediate products or irreversible discharge products will be formed on the surface of the existing cathode material, and the formation of these intermediate products and irreversible products will limit the life of lithium-oxygen batteries.

In this study, an electrochemical method was used to systematically compare the usesCommercial carbon nanoparticlesandCarbon nanofibers arranged vertically (VACNF) as a lithium oxygen battery cathode material on the effect of battery performance. This uniquely developed carbon nanofiber can be used as a cathode materialAvoid bindersAnd significantly improve the stability and capacitance of the battery. With VACNF, the capacitance density of the battery increased from 3.83 Ah g-1 (Vulcan XC) to 5.55 Ah g-1 (VACNF). At the same time, this study usesTransition metals (Ni) andPrecious metal alloys (PtRu) is deposited on VACNF as an electrocatalyst to further improve the discharge/charging performance of the battery. After using PtRu as an electrocatalyst deposited in VACNF, the discharge capacity density of the battery further increased to 9.07 Ah g-1 (the specific surface area discharge capacity was 2.62 mAh cm-2).

Figure 1. Vertically arranged carbon nanofibers and the use of electrocatalyst coatings (PtRu and Ni) enhance the chemical properties of lithium-oxygen batteries.

In order to further understand the mechanism by which novel materials improve battery performance, the research team used field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy (XPS) to further study the structure of the prepared materials and electrodes. Cycle stability tests of batteries showed superior cycle stability (27 cycles) compared to VACNF-Ni (13 cycles), VACNF (8 cycles) and Vulcan XC (3 cycles). As illustrated by XPS analysis of discharge samples, the excellent cycling stability of VACNF-PtRu can be attributed to itInhibition of Li2CO3 during discharge cycles。 At the same time, the team also studied toCarbon clothorCarbon fiberAs a VACNF carrier effect on battery performance.

Paper Information:

Hassan Zaidi SS, Rajendran S, Sekar A, et al. Binder-free Li-O2 battery cathodes using Ni- and PtRu-coated vertically aligned carbon nanofibers as electrocatalysts for enhanced stability. Nano Research Energy, 2023, https://doi.org/10.26599/NRE.2023.9120055

DOI:10.26599/NRE.2023.9120055

Nano Research Energy is a companion journal of Nano Research, (ISSN: 2791-0091; e-ISSN: 2790-8119; Official Website: https://www.sciopen.com/journal/2790-8119Founded in June 2022, Professor Qu Liangti of Tsinghua University and Professor Chunyi Zhi of City University of Hong Kong serve as editors-in-chief.Nano Research EnergyIt is an international multidisciplinary and English-based open access journal, focusing on the cutting-edge research and application of nanomaterials and nanoscience and technology in new energy-related fields, benchmarking against top international energy journals, and committed to publishing high-level original research and review papers, which has been selected2022 China Science and Technology Journals Excellence Action Plan – High Starting Point New Journal Project。 APC fees will be waived until 2025, and teachers are welcome to submit their papers.

To submit, please contact:

NanoResearchEnergy@tup.tsinghua.edu.cn

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