Affiliation:
1. Materials Science and Engineering Program & Texas Materials Institute The University of Texas at Austin Austin TX 78712‐1591 USA
Abstract
AbstractAll‐solid‐state batteries (ASSBs) employing Li‐metal anodes and inorganic solid electrolytes are attracting great attention due to high safety and energy density for next‐generation energy storage devices. However, the volume change of cathode active materials can cause contact loss, resulting in charge carrier isolation, heterogeneous current distribution, and poor electrochemical properties in ASSBs. Here, a simple, yet effective, solvent‐free electrode engineering approach with polytetrafluoroethylene (PTFE) as a binder for ASSBs is reported, enabling intimate contact and stable interfaces with the cathode. It is substantiated that the crystallinity of PTFE can be controlled depending on the heat history, and highly crystalline PTFE displays robust mechanical properties. High‐nickel LiNi0.8Mn0.1Co0.1O2 cathode prepared with crystalline PTFE show improved cycle and rate performances in ASSBs. In addition, it is revealed that the intimate contact between cathode particles with a stable cathode electrolyte layer is maintained during cycling by postmortem studies. This simple engineering method can be applied to prepare cathodes with a variety of active materials and solid electrolytes in ASSBs.
Subject
General Materials Science,General Chemistry
Cited by
4 articles.
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