Seongmin Kim, Michael J. Lee, Seung Ho Kwon, Jinseok Park, Youyoung Byun, Jaeyoung Choi, Hyeonseok Seong, Hyun Soo Kwon, Eunji Lee, Seung Woo Lee, Bumjoon J. Kim
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引用次数: 0
Abstract
To facilitate the use of solid polymer electrolytes (SPEs) with high-nickel (Ni) cathodes in high-voltage lithium (Li) metal batteries (LMBs), it is crucial to address the challenges of low oxidative stability and the formation of vulnerable interphases. In this study, isocyanate groups (−N═C═O) are incorporated to develop an SPE with a bi-continuous structure, consisting of elastomeric and plastic crystal phases. This rationally designed SPE exhibits high ionic conductivity (0.9 × 10−3 S cm−1 at 25 °C), excellent elasticity (elongation at break of 330%), and enhanced oxidative stability (over 4.8 V vs. Li/Li⁺). A full cell, incorporating this SPE with a thin Li foil of 40 µm, and a high-Ni LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode operating at 4.7 V vs. Li/Li⁺, demonstrates excellent cyclability, retaining 70% of its initial capacity after 200 cycles under a high C-rate of 1C at 25 °C. The extended cycling of isocyanate-containing SPE at 4.7 V vs. Li/Li⁺ is attributed to robust and compact inorganic-rich interphases enabled by antioxidative −N−C═O components, as well as uniform Li deposition attributed to the bi-continuous structured SPE. This study suggests that the isocyanate-containing SPE system is a promising candidate for high-voltage solid-state LMBs by constructing stable interphases.
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.