Self-cleaning all-fluorinated nonflammable electrolyte for high-voltage and high-temperature Li||NCM811 batteries

IF 18.9 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Maosheng Li , Lisi Xu , Anqi He , Haijiao Xie , Kuirong Deng
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引用次数: 0

Abstract

All-fluorinated electrolytes with high oxidation stability and favorable flame-retardant property are promising electrolytes for high-voltage Li metal batteries. However, conventional all-fluorinated electrolytes consisting of fluoroethylene carbonate (FEC) and LiPF6 suffer from grievous decompositions at elevated temperature, which generates reactive species (such as HF and PF5) and seriously damages interfacial structures of electrodes. Herein, we develop a self-cleaning all-fluorinated nonflammable electrolyte, which employes ethoxy(pentafluoro)cyclotriphosphazene (PFPN) to stabilize PF6 via intermolecular interactions, restrain the generation of HF, prevent the decomposition of FEC and enhance thermostability of the electrolyte. The strong interactions between PFPN and other components regulate the solvation structures, and bring more PF6 anions into the primary solvation shell of Li+ to construct solid electrolyte interphases (SEIs) and cathode-electrolyte interphases (CEIs), which leads to the fabrication of robust LiF-rich SEIs/CEIs. Benefiting from the above advantages, the designed electrolyte possesses excellent high-temperature interface compatibility with Li metal anodes and NCM811 cathodes, which endows Li||NCM811 batteries with significantly enhanced cycling stability at 60 °C and high cut-off voltage of 4.5 V. This work provides rational design of highly stable electrolytes for Li metal batteries capable of withstanding aggressive operating conditions.

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来源期刊
Energy Storage Materials
Energy Storage Materials Materials Science-General Materials Science
CiteScore
33.00
自引率
5.90%
发文量
652
审稿时长
27 days
期刊介绍: Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field. Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy. Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.
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