首页|Alleviating the sluggish kinetics of all-solid-state batteries via cathode single-crystallization and multi-functional interface modification
Alleviating the sluggish kinetics of all-solid-state batteries via cathode single-crystallization and multi-functional interface modification
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The application of Li-rich Mn-based cathodes,the most promising candidates for high-energy-density Li-ion batteries,in all-solid-state batteries can further enhance the safety and stability of battery systems.However,the utilization of high-capacity Li-rich cathodes has been limited by sluggish kinetics and sev-ere interfacial issues in all-solid-state batteries.Here,a multi-functional interface modification strategy involving dispersed submicron single-crystal structure and multi-functional surface modification layer obtained through in-situ interfacial chemical reactions was designed to improve the electrochemical per-formance of Li-rich Mn-based cathodes in all-solid-state batteries.The design of submicron single-crystal structure promotes the interface contact between the cathode particles and the solid-state electrolyte,and thus constructs a more complete ion and electron conductive network in the composite cathode.Furthermore,the Li-gradient layer and the lithium molybdate coating layer constructed on the surface of single-crystal Li-rich particles accelerate the transport of Li ions at the interface,suppress the side reac-tions between cathodes and electrolyte,and inhibit the oxygen release on the cathode surface.The opti-mized Li-rich cathode materials exhibit excellent electrochemical performance in halide all-solid-state batteries.This study emphasizes the vital importance of reaction kinetics and interfacial stability of Li-rich cathodes in all-solid-state batteries and provides a facile modification strategy to enhance the elec-trochemical performance of all-solid-state batteries based on Li-rich cathodes.
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,Beijing National Laboratory for Molecular Sciences(BNLMS),Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
University of Chinese Academy of Sciences,Beijing 100049,China
CAS Key Laboratory of Standardization and Measurement for Nanotechnology,National Center for Nanoscience and Technology,Beijing 100190,China
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