摘要
Developing effective heterostructure strategies to mitigate the shuttling effect and accelerate lithium polysulfide(Li PS)conversion remains a critical challenge in lithium–sulfur(Li–S)batteries.Here,we report the first carbon–free VO_(2)–VS_(2)heterostructure material synthesized via in situ sulfurization,applied as a modifier on a commercial polypropylene(PP)separator(denoted as VO_(2)–VS_(2)@PP).The as–prepared VO_(2)–VS_(2)nanorods synergistically combine the high absorptivity of VO_(2)with the efficient catalytic properties of VS_(2),simultaneously enhancing Li PS anchoring and promoting its conversion.We systematically investigate the influence of material composition on battery performance,leveraging these functional attributes,Li–S cells incorporating VO_(2)–VS_(2)@PP exhibit exceptional cycle stability(over 500cycles at 1C),impressive rate performance(807 m Ah.g^(–1)at 5C),desirable reversibility(49.9%capacity retention after 300 cycles at 5C)and exceptional pouch cell performance(3.65 m Ah.cm^(–2)after 50 stable cycles at 0.1C).This study underscores the potential of tailored heterostructures in realizing high–performance Li–S batteries,offering new insights for next–generation energy storage solutions.
基金
financially supported by Jilin province science and technology department(No.20230402059GH)
Changchun Science and Technology Bureau(No.23YQ11)
Jilin Province Science and Technology Department major science and technology project(Nos.20220301004GX and 20220301005GX)
Key Subject Construction of Physical Chemistry of Northeast Normal University(No.2412022XK004)
the National Natural Science Foundation of China(No.22102020)
the Swedish Foundation for International Cooperation in Research and Higher Education(No.KO2017-7351)
Swedish Energy Agency(No.P2020-90216)。
