Tailored Organic Electrode Material Compatible with Sulfide Electrolyte for Stable All‐Solid‐State Sodium Batteries

• Published in: Angewandte Chemie Vol. 130; no. 10; pp. 2660 - 2664
• Main Authors: Chi, Xiaowei, Liang, Yanliang, Hao, Fang, Zhang, Ye, Whiteley, Justin, Dong, Hui, Hu, Pu, Lee, Sehee, Yao, Yan
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.03.2018; Wiley Blackwell (John Wiley & Sons)
• Subjects: Anodes; Batterien; Batteries; Carbonylverbindungen; Cathodes; Chemistry; Electrode materials; Electrolytes; Energiespeichermaterialien; Interkalation; Lithium; Lithium-ion batteries; Organische Halbleiter; Sodium; Specific capacity; Sulfide; Sulfides
• ISSN: 0044-8249; 1521-3757
• DOI: 10.1002/ange.201712895

All‐solid‐state sodium batteries (ASSSBs) with nonflammable electrolytes and ubiquitous sodium resource are a promising solution to the safety and cost concerns for lithium‐ion batteries. However, the intrinsic mismatch between low anodic decomposition potential of superionic sulfide electrolytes and high operating potentials of sodium‐ion cathodes leads to a volatile cathode–electrolyte interface and undesirable cell performance. Here we report a high‐capacity organic cathode, Na4C6O6, that is chemically and electrochemically compatible with sulfide electrolytes. A bulk‐type ASSSB shows high specific capacity (184 mAh g−1) and one of the highest specific energies (395 Wh kg−1) among intercalation compound‐based ASSSBs. The capacity retentions of 76 % after 100 cycles at 0.1 C and 70 % after 400 cycles at 0.2 C represent the record stability for ASSSBs. Additionally, Na4C6O6 functions as a capable anode material, enabling a symmetric all‐organic ASSSB with Na4C6O6 as both cathode and anode materials. Ein organisches Elektrodenmaterial (Na4C6O6) wurde sowohl als Kathode als auch als Anode in einer Natrium‐Festkörperbatterie verwendet. Das Material ist chemisch und elektrochemisch kompatibel mit Sulfid‐Festkörperelektrolyten. Die auf Na4C6O6 basierenden Na‐Festkörperbatterien weisen eine hohe spezifische Kapazität, eine rekordhohe Energiedichte und gute Zyklenstabilität auf.