High‐Performance Se–S Composite Cathode Rich in Defects for Wide‐Temperature Solid‐State Lithium Batteries
Xiaomeng Shi,
Zhichao Zeng,
Yongqing Wen,
Hongtu Zhang,
Yabin Zhang,
Yaping Du
Affiliations
Xiaomeng Shi
Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional Materials Smart Sensing Interdisciplinary Science Center School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China
Zhichao Zeng
Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional Materials Smart Sensing Interdisciplinary Science Center School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China
Yongqing Wen
Baotou Research Institute of Rare Earths Rare Earth Advanced Materials Technology Innovation Center Baotou 014010 China
Hongtu Zhang
Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional Materials Smart Sensing Interdisciplinary Science Center School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China
Yabin Zhang
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources Environment and Materials Guangxi University Nanning 530004 China
Yaping Du
Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional Materials Smart Sensing Interdisciplinary Science Center School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China
All‐solid‐state lithium batteries (ASSLBs) are a research hotspot for their superior safety. The solid electrolytes (SEs) are key components in ASSLBs, and the emerging rare‐earth halide SEs (RE‐HSEs) are valued for their comprehensive performances of good ionic conductivity, electrochemical stability, and deformability. In addition, cathode materials can influence the properties of ASSLBs, and sulfur (S) attracts much attention due to the lower toxicity and much higher energy density compared with commercial oxide cathodes. However, the S possesses poor electronic conductivity, which can be improved by the introduction of selenium (Se) with much higher electronic conductivity. In this work, a series of SexS1–x composites is synthesized by a melting method. Due to the introduction of Se and the enriched defects from the melting process, the electronic and ionic conductivities of SexS1–x are improved. After application in ASSLBs based on RE‐HSE Li3YBr6, the SexS1–x materials exhibit good performances with low polarizations, good cycling stabilities, and excellent rate properties at room temperature. Moreover, the assembled solid batteries can realize stable cycling performance (100 cycles) at low temperature (−30 °C) and a normal discharge–charge process at high temperature (120 °C).
