摘要
The practical application of lithium-sulfur(Li-S)batteries,as promising next-generation batteries,is hindered by their shuttle effect and the slow redox kinetics.Herein,a tungsten and molybdenum nitride heterostructure functionalized with hollow metal-organic framework-derived carbon(W_(2)N/Mo_(2)N)was proposed as the sulfur host.The hollow spherical structure provides storage space for sulfur,enhances electrical conductivity,and inhibits volume expansion.The metal atoms in the nitrides bonded with lithium polysulfides(Li PSs)through Lewis covalent bonds,enhancing the high catalytic activity of the nitrides and effectively reducing the energy barrier of Li PSs redox conversion.Moreover,the high intrinsic conductivity of nitrides and the ability of the heterostructure interface to accelerate electron/ion transport improved the Li+transmission.By leveraging the combined properties of strong adsorption and high catalytic activity,the sulfur host effectively inhibited the shuttle effect and accelerated the redox kinetics of Li PSs.High-efficiency Li+transmission,strong adsorption,and the efficient catalytic conversion activities of Li PSs in the heterostructure were experimentally and theoretically verified.The results indicate that the W_(2)N/Mo_(2)N cathode provides stable,and long-term cycling(over 2000 cycles)at 3 C with a low attenuation rate of 0.0196%per cycle.The design strategy of a twinborn nitride heterostructure thus provides a functionalized solution for advanced Li-S batteries.
基金
supported by the National Natural Science Foundation of China (52202104)
the China Postdoctoral Science Foundation (2021T140433,2020M683408)
the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China (LZY23B030002)
the Quzhou Science and Technology Bureau Project (2021D006)
the International Cooperation Projects of Sichuan Provincial Department of Science and Technology (2021YFH0126)
the Fundamental Research Funds for the Central Universities (ZYGX2020ZB016)
the Key Research and Development Program of Yunnan Province China (202103AA080019)
the Yunnan Major Scientific and Technological Projects (202202AG050003)
the Foundation of Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University (OF2022-04)。
