Constructing host–guest recognition electrolytes promotes the Li+ kinetics in solid-state batteries

文献信息

发布日期 2024-01-02
DOI 10.1039/D3EE03283C
影响因子 38.532
作者

Qing Liu, Li Yang, Zhiyuan Mei, Qi An, Kun Zeng, Wenjing Huang, Shimin Wang, Yongjiang Sun


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摘要

Owing to their good interfacial contact with electrodes, solid polymer electrolytes (SPEs) are believed to be a promising candidate for solid-state batteries. However, the inferior kinetics of SPEs, which are caused by their lower Li+ conductivity and narrower electrochemical window, have severely hindered their applications. Here, a novel host–guest recognition gel polymer electrolyte (GPE) strategy is proposed and further combined with in situ polymerization technology to construct a MOFs–GPE system. Innovatively, Ti-MOFs with synergetic various sites serve as a “host” platform for the GPE to tune the electrolyte properties; they not only act as a highly effective accelerator for Li+ ion conduction, but also afford favorable properties in terms of mechanical strength and withstanding high voltage. The MOFs–GPE system enables the stable operation of state-of-the-art cathodes LiFePO4 and high-voltage LiNi0.9Co0.05Mn0.05O2. The as-assembled LiNi0.9Co0.05Mn0.05O2|G@MOFs (Ti)|graphite full battery demonstrates a good cycling stability with 71.4% capacity retention after 250 cycles at room temperature. In situ measurements and DFT calculations reveal that the transport kinetics of the Li+ ions in the composite electrolyte can be accelerated by the introduced MOF host. This work provides significant guidance for improving ion transport in host–guest recognition SPEs and an understanding of the potential Li+ kinetics mechanisms.

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来源期刊

Energy & Environmental Science

Energy & Environmental Science
CiteScore: 32.34
自引率: 3.4%
年发文量: 481

Energy & Environmental Science is an international journal dedicated to publishing exceptionally important and high quality, agenda-setting research tackling the key global and societal challenges of ensuring the provision of energy and protecting our environment for the future. The scope is intentionally broad and the journal recognises the complexity of issues and challenges relating to energy conversion and storage, alternative fuel technologies and environmental science. For work to be published it must be linked to the energy-environment nexus and be of significant general interest to our community-spanning readership. All scales of studies and analysis, from impactful fundamental advances, to interdisciplinary research across the (bio)chemical, (bio/geo)physical sciences and chemical engineering disciplines are welcomed. Topics include, but are not limited to, the following: Solar energy conversion and photovoltaics Solar fuels and artificial photosynthesis Fuel cells Hydrogen storage and (bio) hydrogen production Materials for energy systems Capture, storage and fate of CO2, including chemicals and fuels from CO2 Catalysis for a variety of feedstocks (for example, oil, gas, coal, biomass and synthesis gas) Biofuels and biorefineries Materials in extreme environments Environmental impacts of energy technologies Global atmospheric chemistry and climate change as related to energy systems Water-energy nexus Energy systems and networks Globally applicable principles of energy policy and techno-economics

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