3 years ago

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

Fang Hao, Pu Hu, Sehee Lee, Hui Dong, Yanliang Liang, Yan Yao, Justin Whiteley, Ye Zhang, Xiaowei Chi
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 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) and one of the highest specific energy (395 Wh/kg) among intercalation compound-based ASSSBs. The capacity retentions of 76% after 100 cycles at 0.1C and 70% after 400 cycles at 0.2C 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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201712895

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